CN116799878B - Dynamic reactive power coordination control method for new energy collection area based on power generation trend prediction - Google Patents
Dynamic reactive power coordination control method for new energy collection area based on power generation trend prediction Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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Abstract
The invention relates to the technical field of power grid dispatching, and discloses a new energy collection area dynamic reactive power coordination control method based on power generation trend prediction, which comprises the following steps: constructing a power grid model of a new energy collection area, and reading the first sampling periodSampling the section of the power grid model at the moment; initialization ofAcquiring the first sampling periodGenerating trend of the b-th transformer substation at sampling time; judging whether the current bus voltage to be monitored is out of limit or not; if the bus voltage is out of limit, entering a bus voltage correction control mode; if the bus voltage is not out of limit, entering a bus voltage optimization control mode; order theRepeating the correction or optimization untilAnd realizing automatic voltage control of the s-th bus to be monitored in the b-th transformer substation at all sampling moments in the current sampling date. According to the invention, through unified coordination control of different reactive power equipment in the new energy collection area, the new energy collection area reserves as many dynamic reactive power reserves as possible, the static voltage stability margin of the power grid is improved, and the automatic voltage control level of the power grid is improved.
Description
Technical Field
The invention relates to the technical field of power grid dispatching, in particular to a new energy collection area dynamic reactive power coordination control method based on power generation trend prediction.
Background
In order to cope with global climate change and energy crisis, low-carbonization transformation is becoming the trend of current power industry development, and for this reason, china continuously advances industry structure and energy structure adjustment, gradually builds a novel power system mainly based on new energy.
With the access of new high-proportion energy sources of a novel power system and the use of high-proportion power electronic element equipment, the problems of voltage control and voltage stability in power grid dispatching are increasingly outstanding, and the safe and stable operation and new energy source consumption of a power grid are more challenged. The new energy power supply end power grid is matched with a power supply planning to collect power in a mode of complementation of water, light, wind, fire, storage, transmission and the like, and has the characteristics of large new energy duty ratio, multiple power supply combination modes, complex and changeable power grid operation modes and the like. The dynamic reactive power equipment is used as dynamic voltage regulating equipment, so that the transient voltage stability level of the system can be improved, the static voltage stability margin of the system can be improved, and the problem of voltage stability of various types in the new energy source power transmission end power grid can be effectively solved. In the transient processes of power grid faults and the like, the dynamic reactive power equipment can provide strong transient reactive power support and short-time overload through the dynamic voltage regulation capability of the dynamic reactive power equipment, so that the transient overvoltage problem of a transformer substation and a new energy station is solved; in a steady state process after the power grid fails, the dynamic reactive power equipment can also adjust steady state voltage, and the steady state overvoltage problem after the power grid is stabilized and controlled is reduced.
The current reactive coordination control method is based on the current running state of the power grid, and when voltage needs to be regulated, currently available reactive equipment is selected for control, so that randomness is realized, capacitive reactance equipment can be used excessively, the action times of the capacitive reactance equipment are increased, and the service life is influenced; meanwhile, in order to reserve the dynamic reactive power reserve margin, the moment of utilizing the dynamic reactive power equipment is not well known, the dynamic reactive power equipment is thrown in too early to achieve the regulation target, or the reactive power reserve is kept by the dynamic reactive power equipment as little as possible. The situation is that targeted unified coordination control is lacking for reactive equipment in a new energy collection area, such as capacitive reactance devices, dynamic reactive equipment and new energy units. On the one hand, the waste of dynamic reactive power regulation capability is caused, and on the other hand, the service life of the reactive power equipment of the capacitive reactance is influenced, namely, the maximum action times are influenced.
In summary, the existing reactive power control method lacks a unified coordination control method for various reactive power equipment in the new energy collection area, has the situations of insufficient reactive power support or waste of dynamic reactive power adjustment capability, and can influence the service life of the reactive power equipment of the capacitive reactance.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the reactive power control is inaccurate and the service life of the reactive power equipment is influenced because the coordinated control of various reactive power equipment cannot be uniformly and fully performed in the prior art.
In order to solve the technical problems, the invention provides a new energy collection area dynamic reactive power coordination control method based on power generation trend prediction, which comprises the following steps:
s1: constructing a power grid model of a new energy collection area, acquiring a bus set to be monitored, and determining a b-th transformer station in the new energy collection area to which an s-th bus to be monitored belongs;the method comprises the steps of carrying out a first treatment on the surface of the S represents the total number of buses in the power grid to be monitored;the method comprises the steps of carrying out a first treatment on the surface of the B represents the total number of substations in the new energy collection area; determining the common under the b-th transformer substation according to the topological structure of the power grid modelNew energy power plants; initializing sampling times i=0;
s2: reading the current sampling periodAcquiring the state of an s-th bus to be monitored, the state of capacitive reactance equipment in a b-th transformer substation, the state of dynamic reactive equipment, the state of a new energy power plant unit and reactive voltage sensitivity information from a power grid model section at the sampling moment;
s3: according to the sub-category of the b-th substationGenerating forecast information of each new energy power plant and acquiring the first sampling periodGenerating trend of the b-th transformer substation at sampling time; the power generation trend comprises a rising stage, a falling stage, a peak stage and a valley stage;
S4: according to the state of the s-th bus to be monitored, acquiring a voltage sampling value of the s-th bus to be monitored, comparing the voltage sampling value with a preset voltage upper limit value and a preset voltage lower limit value, and judging whether the current voltage of the s-th bus to be monitored is out of limit;
s5: if the voltage sampling value is not greater than the preset voltage lower limit value or not less than the preset voltage upper limit value, judging that the current s bus voltage to be monitored is out of limit, and entering a b-th substation bus voltage correction control mode, wherein the method comprises the following steps of: if the power generation trend is in an ascending stage or a descending stage, selecting and adjusting target capacitive reactance equipment to eliminate the s-th bus voltage out-of-limit to be monitored; if the power generation trend is in a peak stage or a valley stage, selecting and adjusting target dynamic reactive equipment to eliminate the s-th bus voltage out-of-limit to be monitored; if the voltage sampling value is larger than the preset voltage lower limit value and smaller than the preset voltage upper limit value, judging that the current s bus voltage to be monitored is not out of limit, and entering a b-th substation bus voltage optimization control mode, wherein the method comprises the following steps of: if the power generation trend is in an ascending stage or a descending stage, selecting and adjusting target capacitive reactance equipment to realize the busbar voltage optimization target to be monitored; if the power generation trend is in a peak stage or a valley stage and the new energy power plant unit has the adjusting capability, selecting and adjusting the target new energy power plant unit to realize the busbar voltage optimization target to be monitored; if the adjusting capacity of the new energy power plant unit is used up, selecting and adjusting target dynamic reactive power equipment to realize the busbar voltage optimization target to be monitored;
S6: let i=i+1, repeat steps S2 to S5 until，And the total sampling time in one sampling date is represented, and automatic voltage control of the s-th bus to be monitored in the b-th transformer station of the new energy collection area under all sampling time in the current sampling date is realized.
Specifically, in step S2, it includes:
reading the current sampling dateMiddle (f)Power grid model section at sampling momentAcquiring the state of the s-th bus to be monitoredCapacitive reactance device status of the b-th substationDynamic reactive equipment statusAnd the state of a new energy power plant unitAnd reactive voltage sensitivity information；
Section of power grid modelExpressed as:；
wherein the subscript m indicates that the grid date isA corresponding state at the time; the index i indicates the current dateA state corresponding to the moment; when initializing i=0, this represents the 0 th in the current day: 00 states corresponding to sampling time;
represent the firstThe initial state information of the s-th bus to be monitored at the moment is expressed as follows:
；
wherein,the b-th substation bus which indicates that the s-th substation bus needs to be monitored is at the thA state of time;，represent the firstThe voltage sampling value of the s-th bus to be monitored in the b-th transformer station at the moment,and (3) withRespectively represent the firstA preset voltage lower limit value and a preset voltage upper limit value of an s-th bus to be monitored in a b-th transformer station at the moment, Represent the firstThe voltage optimization value of the s-th bus to be monitored in the b-th transformer station at the moment;the new energy power plant bus of the new energy collection area which indicates the s th new energy collection area to be monitored is at the s thA state of time;
represent the firstThe initial state information of the moment capacitive reactance device is expressed as:
；
wherein,indicating that the r-th capacitive reactance switch is at the r-thThe operating state of the time of day,indicating that the r-th capacitive reactance is at the firstThe reactive power sampled value at the moment,representing the rated capacity of the r-th capacitive reactance; r denotes the serial number of the capacitive reactance device in the network,the method comprises the steps of carrying out a first treatment on the surface of the R represents the total number of capacitive reactance devices in the grid;
represent the firstThe initial state information of the dynamic reactive equipment at the moment is expressed as:
；
wherein,indicating that the t-th dynamic reactive equipment is at the t-thThe reactive power sampled value at the moment,representing the reactive lower limit value of the t-th dynamic reactive device,representing the reactive upper limit of the t-th dynamic reactive device,representing reactive reserve set values of the t-th dynamic reactive equipment; t represents the serial number of the dynamic reactive equipment in the power grid,the method comprises the steps of carrying out a first treatment on the surface of the T represents the total number of dynamic reactive devices in the grid;
represent the firstThe initial state information of the new energy power plant unit at the moment is expressed as:
；
wherein,indicating that the g new energy power plant is arranged at the g The active information of the moment of time,indicating that the g new energy power plant is arranged at the gReactive information of moment; g represents the serial number of a new energy power plant unit in the power grid,the method comprises the steps of carrying out a first treatment on the surface of the G represents the total number of new energy power plant units in the power grid;，indicating that the g new energy power plant is arranged at the gThe reactive power sampled value at the moment,represents the reactive lower limit value of the g new energy power plant unit,representing the reactive upper limit value of the g new energy power plant unit;
represent the firstReactive voltage sensitivity information at the time is expressed as:
；
wherein,the sensitivity of the new energy power plant unit to the new energy power plant bus voltage is represented;the sensitivity of the new energy power plant unit to the busbar voltage of the transformer substation in the new energy collection area is shown;the sensitivity of the transformer substation capacitive reactance device in the new energy collection area to the busbar voltage of the transformer substation in the new energy collection area is shown;and the sensitivity of the dynamic reactive power equipment to the bus voltage of the transformer substation in the new energy collection area is shown.
Specifically, in step S3, it includes:
determining the common under the b-th transformer substation according to the topological structure of the power grid modelNew energy power plants;
by superposition ofGenerating forecast information of each new energy power plant, and acquiring sampling date of the b-th transformer substationIs the power generation prediction information of (a) ：；
Wherein the power generation trend prediction index k of the new energy power plant represents a prediction point,the method comprises the steps of carrying out a first treatment on the surface of the K represents the total number of the power generation trend prediction subscripts of the new energy power plant;a new energy power plant serial number subordinate to the b-th transformer substation is represented;representing the total number of new energy power plants subordinate to the b-th substation;representing the b-th substation subordinateGenerating trend prediction information of the new energy power plant at the kth prediction point;
by generating predictive information for the b-th substationThe power generation trend state of the b-th transformer substation at the kth predicted point is obtained; setting the power generation trend of the b-th transformer substation at the kth predicted point asExpressed as:；
wherein,、、and (3) withThe power generation trend of the b-th transformer substation at the kth predicted point is respectively represented as an ascending stage, a descending stage, a peak stage and a valley stage;
the predicted point k represents the sampling dateEach predicted point k corresponds to the dateIs not equal to the sampling time of the sampleAccording to the power generation trend information of the b-th transformer substationAcquisition dateSampling time of (a)Information of indicated power generation trendExpressed as:
；
wherein,、、and (3) withRespectively represent that the b-th transformer substation is at the b-thThe power generation trend at the sampling moment is an ascending phase, a descending phase, a peak phase and a valley phase.
Specifically, the relationship among the reactive voltage sensitivity information, the voltage variation amount, and the reactive variation amount includes:
setting the firstReactive power adjustment quantity of g new energy power plant unit at moment isThen there is:
；reactive power adjustment for g-th new energy power plant unitWhen the voltage change quantity of the new energy power plant bus to be monitored is the s th;
setting the firstReactive power adjustment quantity of g new energy power plant unit at moment isThen there is:
；reactive power adjustment for g-th new energy power plant unitWhen the new energy collection area transformer substation bus to be monitored is in the s state, namely the voltage variation of the bus to be monitored is in the s state;
setting the firstThe reactive power adjustment quantity of the r-th capacitive reactance at the moment isThen there is:
；representing the reactive power adjustment of the r-th capacitive reactanceWhen the voltage variation of the s th bus to be monitored is changed;
setting the firstThe reactive power adjustment quantity of the t-th dynamic reactive power equipment at the moment isThen there is:
；reactive power adjustment of t-th dynamic reactive power equipmentWhen the bus bar to be monitored is the s th bus barVoltage variation of (2).
Specifically, if the power generation trend is in a rising stage or a falling stage, selecting and adjusting the target capacitive reactance device to eliminate the bus voltage out-of-limit to be monitored, including:
If the power generation trend is in an ascending stage or a descending stage, marking the capacitive reactance equipment in a hot standby state as optional capacitive reactance equipment according to the state of the capacitive reactance equipment in the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different selectable capacitive reactance devices are put into a power grid; selecting target capacitive reactance equipment according to corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, a current voltage sampling value of an s-th bus to be monitored, a preset voltage upper limit value and a preset voltage lower limit value; and changing the state of the target capacitive reactance device to change the voltage value of the s bus to be monitored, and eliminating the out-of-limit voltage of the s bus to be monitored.
Specifically, the changing the state of the target capacitive reactance device to change the voltage value of the s th bus to be monitored, eliminating the out-of-limit voltage of the s th bus to be monitored includes:
scanning within a b-th substationThe running state of the individual capacitive reactance equipment, marking the capacitive reactance equipment in the hot standby state as optional capacitive reactance equipment, and setting the serial number of the optional capacitive reactance equipment in the b-th transformer substation as，；Representing the total number of selectable capacitive reactance devices in the b-th substation; when (when) When describing the capacitive reactance devices available in the b-th substation；
Setting information of optional capacitive reactance device of b-th substationThe following are provided:
；
wherein,indicating that the number of the optional capacitive reactance devices of the b-th substation is not greater than the total number of the capacitive reactance devices;
when the b-th transformer substation is inAfter the optional capacitive reactance devices are put into operation, the reactive power adjustment quantity is as follows:
；
according to the sensitivity of the transformer substation capacitive reactance device in the new energy collection area to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive variation, and the voltage variation of the corresponding s th bus to be monitored is obtained as follows:；
if the voltage of the s th bus to be monitored meetsThen (1)Checking the control strategy input by the optional capacitive reactance equipment, passing the control strategy input by the optional capacitive reactance equipment, and checking the second capacitive reactance equipmentIndividual selectable capacitive reactance deviceThe prepared lower mark is；
Sequentially to the b-th transformer substationChecking a control strategy input by each optional capacitive reactance device, and setting the serial number of the optional capacitive reactance device passing the check in the b-th transformer substation as，；Indicating the total number of the optional capacitive reactance devices passing verification in the b-th substation; form the firstThe control strategy information of the optional capacitive reactance device in the b-th substation at the moment is expressed as:
；
wherein, ，Representing the b-th substationControl information for the individual selectable capacitive reactance devices;
according to control strategy information of optional capacitive reactance device in b-th transformer substationAccording to the principle that the reactive load balance of the main transformer is consistent with the action times of the capacitive reactance device, the method comprises the following steps ofSelecting one of the selectable capacitive reactance devices as a target capacitive reactance device to control, and forming a final control instruction; after the target capacitive reactance equipment is selected, setting a switch of the target capacitive reactance equipment as follows according to the initial state information of the target capacitive reactance equipmentGenerate the firstThe action instructions of the switch where the capacitive reactance is located are as follows:；
wherein the method comprises the steps ofRepresentation control of the firstThe switch where the capacitive reactance is located is closed;
by issuing the firstThe closing instruction of the switch where the capacitive reactance is positioned realizes the firstAnd (3) a control strategy of the content resistor equipment of the b-th transformer substation at any time is adopted, so that the problem of bus voltage out-of-limit to be monitored is solved.
Specifically, if the power generation trend is in a peak stage or a valley stage, selecting and adjusting the target dynamic reactive power equipment to eliminate the bus voltage out-of-limit to be monitored, including:
if the power generation trend is in a peak stage or a valley stage, marking the dynamic reactive equipment which is in an operating state and has the adjusting capability as optional dynamic reactive equipment according to the state of the dynamic reactive equipment in the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different optional dynamic reactive devices are put into a power grid; selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable dynamic reactive power equipment is put into operation, the current voltage sampling value of the s th bus to be monitored, the preset voltage upper limit value and the preset voltage lower limit value; changing the state of the target dynamic reactive power equipment to change the voltage value of the s bus to be monitored, and eliminating the out-of-limit voltage of the s bus to be monitored.
Specifically, the changing the state of the target dynamic reactive power equipment to change the voltage value of the s-th bus to be monitored, eliminating the out-of-limit voltage of the s-th bus to be monitored includes:
scanning within a b-th substationThe running state of each dynamic reactive power equipment is marked, the dynamic reactive power equipment which is in the running state and has the adjusting capability is selected as the optional dynamic reactive power equipment, and the serial number of the optional dynamic reactive power equipment in the b-th transformer substation is set as，；Indicating the total number of optional dynamic reactive devices in the b-th substation whenWhen the dynamic reactive equipment is available in the b-th transformer substation; the optional dynamic reactive power equipment needs to meet the following conditions:and is also provided with；
Setting optional dynamic reactive equipment information of b-th substationThe following are provided:
；
wherein,indicating that the number of optional dynamic reactive devices in the b-th substation is not greater than the total number of dynamic reactive devices;
setting the firstThe initial target of the reactive power variable quantity of each selectable dynamic reactive power equipment is reactive power reserve set valueReactive power adjustmentThe method comprises the steps of carrying out a first treatment on the surface of the According to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive variation is obtainedThe following bus voltage variation is expressed as:；
setting the first Reactive power setting target value of each selectable dynamic reactive power equipment is as followsInitial defaultFor the firstAnd (3) checking the control strategy of each optional dynamic reactive power equipment:
according to the s-th busbar voltage variation to be monitoredIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsAnd is also provided withDescription of the first embodimentThe control strategy of each optional dynamic reactive equipment is checked to pass, and the first is markedSubscript of each selectable dynamic reactive device is；
First, theReactive target value of control strategy of each selectable dynamic reactive equipment:；
wherein,first, theThe reactive target value of each selectable dynamic reactive device is equal to the reactive reserve value;
according to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsDescription of the first embodimentThe control strategy check of the individual optional dynamic reactive devices needs to be adjusted, at this time, the firstThe reactive power targets of the individual selectable dynamic reactive power devices cannot be directly adjusted to reactive power reserve values by the following adjustment method:
according to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive power variation, when the voltage variation of the s-th bus to be monitored of the b-th transformer substationWhen corresponding to the first First reactive adjustment of individual selectable dynamic reactive devicesThe method comprises the following steps:
；
at this time, mark the firstSubscript of each selectable dynamic reactive device isFirst, theThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:；
wherein,first, theThe reactive target value of each selectable dynamic reactive device is smaller than the reactive reserve value;
according to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsDescription of the first embodimentThe control strategy check of the individual optional dynamic reactive devices needs to be adjusted, at this time, the firstReactive target of individual selectable dynamic reactive devices is adjusted to reactive reserve valueThe voltage regulation requirement cannot be met, more dynamic reactive power is required to be used for eliminating the out-of-limit of the bus voltage of the transformer substation, and the regulation method is as follows:
according to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive power variation, when the voltage variation of the s-th bus of the b-th transformer substationWhen corresponding to the firstSecond reactive adjustment of individual selectable dynamic reactive devicesThe method comprises the following steps:
；
for the second reactive power adjustmentChecking when the firstIndividual optional dynamic reactive devicesAfter adjustment is greater than the reactive maximum value Correction of：；
At this time, mark the firstSubscript of each selectable dynamic reactive device isFirst, theThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:；
wherein,first, theThe reactive target value of each selectable dynamic reactive equipment is larger than the reactive reserve value and smaller than or equal to the reactive maximum value of the dynamic reactive equipment;
in the first placeAt the moment, for the b-th substationSequentially generating control strategies by the optional dynamic reactive power equipment, and setting the serial number of the dynamic reactive power equipment passing verification in the b-th transformer substation as，；Representing the total number of the dynamic reactive power equipment generating the control strategy in the b-th transformer substation and forming the control strategy information of the dynamic reactive power equipment in the b-th transformer substationThe following are provided:；
wherein,，representing the b-th substationReactive target values of the individual dynamic reactive devices;
according to the firstDynamic reactive equipment control strategy information in time b-th transformer substationAccording to the principle that reactive load balance of main transformer in transformer substation and reactive output of dynamic reactive equipment are consistent, the method comprises the following steps ofSelecting target dynamic reactive equipment from the selectable dynamic reactive equipment to control, and forming a final control instruction; setting the firstSubscript of target dynamic reactive equipment in time b substation is as follows，Control instructions for the target dynamic reactive equipment: ；
Realize the first control command of the target dynamic reactive equipmentA control strategy of dynamic reactive equipment in a substation at the moment b; and the problem of out-of-limit voltage of the s-th bus to be monitored is eliminated by throwing reactive power of target dynamic reactive power equipment in the b-th transformer substation.
Specifically, if the power generation trend is in an ascending phase or a descending phase, selecting and adjusting the target capacitive reactance device to realize the busbar voltage optimization target to be monitored, including:
if the power generation trend is in an ascending stage or a descending stage, marking the capacitive reactance equipment in a hot standby state as optional capacitive reactance equipment according to the state of the capacitive reactance equipment in the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different selectable capacitive reactance devices are put into a power grid; selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, and the current voltage sampling value and the voltage optimizing value of the s-th bus to be monitored; and changing the state of the target capacitive reactance device to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored.
Specifically, the changing the state of the target capacitive reactance device to change the voltage value of the s th bus to be monitored, so as to realize the voltage optimization target of the s th bus to be monitored, includes:
scanning within a b-th substationThe running state of the individual capacitive reactance equipment, marking the capacitive reactance equipment in the hot standby state as optional capacitive reactance equipment, and setting the serial number of the optional capacitive reactance equipment in the b-th transformer substation as，；Representing the total number of selectable capacitive reactance devices within the substation; when (when)When the optional capacitive reactance device is available in the b-th substation, the optional capacitive reactance device is described;
setting optional capacitive reactance device information of b-th transformer substationThe following are provided:
；
wherein,indicating that the number of the optional capacitive reactance devices of the b-th substation is not greater than the total number of the capacitive reactance devices;
when the b-th transformer substation is inAfter the optional capacitive reactance devices are put into operation, the reactive power adjustment quantity is as follows:；
according to the sensitivity of the transformer substation capacitive reactance device in the new energy collection area to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive variation is obtainedThe voltage variation of the corresponding s th bus to be monitored is as follows:；
if the voltage of the s th bus to be monitored meetsDescription of the first embodimentThe optional capacitive reactance equipment is put into the strategy for verification and passed, the first capacitor is connected with the second capacitor The lower label of the individual selectable capacitive reactance devices is；
Sequentially checking the b-th transformer substationControl strategy of the optional capacitive reactance device, set in the b-th transformer stationThe serial number of the optional capacitive reactance device passing the verification is，；Indicating the total number of the optional capacitive reactance devices passing verification in the b-th substation; then the firstThe control strategy information of the optional capacitive reactance device in the b-th substation at the moment is expressed as:；
wherein,，representing the b-th substationControl information for the individual selectable capacitive reactance devices;
according to control strategy information of optional capacitive reactance device in b-th transformer substationAccording to the principle that reactive load balance of main transformer in transformer substation and action times of capacitive reactance equipment are consistent, the method comprises the following steps ofSelecting target capacitive reactance equipment from the selectable capacitive reactance equipment to control, and forming a final control instruction; after the target capacitive reactance equipment in the b-th transformer substation is selected, setting a switch of the target capacitive reactance equipment as a switch according to the initial state information of the capacitive reactance equipmentRaw, give birth toBecome the firstThe action instructions of the switch where the capacitive reactance devices are located are as follows:；
wherein,representation control of the firstThe switch of the individual capacitive reactance devices is closed;
by issuing the firstThe closing instruction of the switch where the capacitive reactance device is positioned realizes the first stepAnd (3) a control strategy of the content reactor equipment of the b-th transformer substation is carried out at any time, and reactive power of the b-th transformer substation is changed by throwing the target content reactor equipment, so that the optimization target of the s-th bus voltage to be monitored is realized.
Specifically, if the power generation trend is in a peak stage or a valley stage and there is a new energy power plant unit with an adjusting capability, selecting and adjusting a target new energy power plant unit to realize a bus voltage optimization target to be monitored, including:
if the power generation trend is in a peak stage or a valley stage and the new energy power plant unit has the adjusting capability, marking the new energy power plant unit which is in an operating state and has the adjusting capability as an optional new energy power plant unit according to the new energy power plant state subordinate to the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive adjustment quantity when the optional new energy power plant unit is put into a power grid; selecting a target new energy power plant unit according to the corresponding voltage variation when different selectable new energy power plant units are put into, and the current voltage sampling value and the voltage optimizing value of the s th bus to be monitored; and changing the state of the target new energy power plant unit to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored.
Specifically, the changing the state of the target new energy power plant unit to change the voltage value of the s th bus to be monitored includes:
When the new energy power plant unit has reactive power regulation capability, the new energy power plant unit is utilized to realize the substation bus voltage optimization target:
scanning the b-th substation subordinateThe running state of each new energy power plant unit is marked, the new energy power plant unit which is in the running state and has the adjusting capability is taken as an optional new energy power plant unit, and the serial number of the optional new energy power plant unit subordinate to the b-th transformer substation is set as，；Indicating the total number of the power plant units of the optional new energy source subordinate to the b-th transformer substation whenWhen the method is used, available subordinate selectable new energy power plant units are described; the unit of the optional new energy power plant needs to meetAnd is also provided with；
Setting unit information of optional new energy power plant of b-th transformer substationThe following are provided:
；
wherein,indicating that the number of the optional new energy power plant units subordinate to the b-th transformer substation is not greater than the total number of the new energy power plant units;
according to the sensitivity of the new energy power plant unit to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive power variation, when the voltage variation of the s th bus to be monitored isWhen the system is used, the total reactive power adjustment requirement of the power plant unit of the optional new energy source subordinate to the b-th transformer substation is correspondingThe method comprises the following steps:
；
counting total reactive power regulation capacity of power plant units of optional new energy of subordinate of b-th transformer substation Expressed as:；
checking total reactive power adjustment demandWhen (when)Is greater than the total reactive power regulation capability of the unit of the optional new energy power plantWhen the total reactive power regulation requirement exceeds the current new energy power plantTotal reactive power regulation capability of the unit, correction total reactive power regulation demand；
According to the total reactive power regulation requirementAccording to the reactive power balance principle of the new energy power plant unit, the total reactive power regulation requirement is setDistributing the new energy power plant units to each new energy power plant unit; setting the firstReactive power increment distributed by each new energy power plant unit isThe subscript of the new energy power plant unit is marked asObtaining the subordinate of the b-th transformer substationReactive target value of each new energy power plant unitExpressed as:；
wherein,represent the firstReactive power increment of each new energy power plant unit;
generating control strategy information of new energy power plant unit subordinate to b-th transformer substationExpressed as:；
the control instruction of the reactive target value of the unit of the new energy power plant is issued to realize the first stepThe b-th transformer station belongs to a control strategy of a new energy power plant unit at the moment; and the optimization target of the s bus voltage to be monitored is realized by changing the reactive power of the unit of the new energy power plant subordinate to the b-th transformer substation.
Specifically, if the adjusting capacity of the target new energy power plant unit is exhausted, selecting and adjusting the target dynamic reactive power equipment to realize the busbar voltage optimization target to be monitored, including:
If the regulating capacity of the target new energy power plant unit is used up, marking the dynamic reactive equipment which is in an operating state and has regulating capacity as optional dynamic reactive equipment according to the state of the dynamic reactive equipment in the b-th transformer substation; determining the corresponding s-th bus voltage variation to be monitored according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive adjustment quantity when different optional dynamic reactive equipment is put into a power grid; selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, and the current voltage sampling value and the voltage optimizing value of the s-th bus to be monitored; and changing the state of the target dynamic reactive power equipment to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored.
Specifically, the changing the target dynamic reactive equipment state to change the voltage value of the s th bus to be monitored includes:
if the reactive power regulation capacity of the new energy power plant unit is exhausted, the reactive power of the dynamic reactive power equipment in the transformer substation is utilized to realize the transformer substation bus voltage optimization target:
scanning within a b-th substationOf dynamic reactive devices The running state is marked, the dynamic reactive equipment which is in the running state and has the adjusting capability is selected as the optional dynamic reactive equipment, and the serial number of the optional dynamic reactive equipment in the b-th transformer substation is set as，；Indicating the total number of optional dynamic reactive devices in the b-th substation whenWhen the method is used, the optional dynamic reactive equipment available in the b-th substation is described; the optional dynamic reactive power equipment needs to meet the following conditions:and is also provided with；
Setting optional dynamic reactive equipment information of b-th substationThe following are provided:
；
wherein,indicating that the number of optional dynamic reactive devices in the b-th substation is not greater than the total number of dynamic reactive devices;
setting the firstThe initial target of the reactive power adjustment quantity of each selectable dynamic reactive power equipment is reactive power reserve set valueReactive power adjustmentThe method comprises the steps of carrying out a first treatment on the surface of the According to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive variation is obtainedThe corresponding transformer substation busbar voltage variation:；
setting the firstReactive power setting target value of each selectable dynamic reactive power equipment is as followsInitial defaultFor the firstAnd (3) checking the control strategy of each optional dynamic reactive power equipment:
according to the s-th busbar voltage variation to be monitoredIf at the first The voltage of the s th bus to be monitored at the moment meetsDescription of the first embodimentThe control strategy of each optional dynamic reactive equipment is checked to pass, and the first is markedSubscript of each selectable dynamic reactive device is；
First, theReactive target value of control strategy of each selectable dynamic reactive equipment:；
wherein,first, theThe reactive target value of each selectable dynamic reactive device is equal to the reactive reserve value;
according to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s th bus to be monitored at the moment meetsDescription of the first embodimentThe control strategy check of the individual optional dynamic reactive devices needs to be adjusted, at this time, the firstThe reactive power targets of the individual selectable dynamic reactive power devices cannot be directly adjusted to reactive power reserve values by the following adjustment method:
according to the sensitivity of the dynamic reactive power equipment to the bus voltage of the transformer substationThe relation between the voltage variation and the reactive variation, when the voltage variation of the s th bus to be monitoredWhen corresponding to the firstFirst reactive adjustment of individual selectable dynamic reactive devicesThe method comprises the following steps:
；
at this time, mark the firstSubscript of each selectable dynamic reactive device isFirst, theThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:；
wherein,first, theThe reactive target value of each selectable dynamic reactive device is smaller than the reactive reserve value;
In the first placeTime of day for the b-th substationSequentially generating control strategies by the optional dynamic reactive equipment, and setting the verification in the b-th transformer substationPass optional dynamic reactive device number，；Representing the total number of the optional dynamic reactive power equipment generating the control strategy in the transformer substation, and forming the control strategy information of the optional dynamic reactive power equipment in the b-th transformer substation：
；
Wherein,，representing the b-th substationControl instruction information of the selectable dynamic reactive equipment;
according to the firstDynamic optional reactive equipment control strategy information in time b-th transformer substationAccording to the principle that reactive load balance of main transformer in transformer substation and reactive output of dynamic reactive equipment are consistent, the method comprises the following steps ofSelecting target dynamic reactive equipment from the selectable dynamic reactive equipment to control, and forming a final control instruction; setting the firstSubscript of target dynamic reactive equipment in time b substation as，Control instruction information for the target dynamic reactive equipment:；
wherein,representing a reactive target value of target dynamic reactive equipment in a b-th substation;
by issuing a control instruction of the target dynamic reactive equipment, the first step is realizedA control strategy for dynamic reactive equipment in the b-th transformer substation at any time; and the optimization target of the s-th busbar voltage to be monitored is realized by changing the reactive power of the target dynamic reactive power equipment.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the new energy collection area dynamic reactive power coordination control method based on power generation trend prediction, the voltage sampling value of the s-th bus to be monitored is compared with the preset voltage upper limit value and the preset voltage lower limit value, and the voltage out-of-limit judgment of the s-th bus to be monitored is carried out; when the s-th bus to be monitored is not out of limit, entering a bus voltage optimization control mode of a transformer substation in a new energy collection area, and realizing a bus voltage optimization target of the transformer substation on the basis of reserving dynamic reactive power storage in the new energy collection area through coordination control of b-th transformer substation content resistor equipment, dynamic reactive power equipment and a new energy power plant unit; when the s-th bus to be monitored is out of limit, entering a new energy collection area transformer substation bus voltage correction control mode, and eliminating the problem of out-of-limit bus voltage to be monitored on the basis of reserving dynamic reactive power storage of the new energy collection area through coordination control of b-th transformer substation content resistor equipment and dynamic reactive power equipment.
According to the invention, reactive power equipment is selected for control in a targeted manner when the bus voltage needs to be regulated according to the current running state and the power generation trend prediction information of the power grid. In the stage of generating rapid change, the capacitive reactance equipment with large capacity is preferentially utilized for control, and strong reactive support is provided for trending continuous reactive demand; in a stable power generation stage, the quick adjustment capability of a new energy unit or dynamic reactive equipment is fully utilized to perform reactive coordination control; the action times of capacitive reactance equipment are reduced, and the service life of the equipment is prolonged; and the quick adjustment capability of the dynamic reactive power equipment can be fully utilized, and finer adjustment requirements can be responded better. According to the invention, unified coordination control among different reactive power devices in the new energy collection area based on power generation trend prediction is realized, so that the new energy collection area can keep as many dynamic reactive power reserves as possible, the static voltage stability margin of the power grid is improved, and the automatic voltage control level of the power grid is improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
FIG. 1 is a flow chart of steps of a new energy collection area dynamic reactive power coordination control method based on power generation trend prediction provided by the invention;
fig. 2 is a schematic diagram of a new energy collection area power grid structure.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
As more and more dynamic reactive power equipment is connected to a power grid, the automatic voltage control of the power grid gradually realizes the dispatching management of the dynamic reactive power equipment, and new requirements are put forward for the automatic voltage control of the power grid: on the one hand, enough dynamic reactive reserves are reserved as much as possible in a steady state to cope with possible fault conditions; on the other hand, the adjusting capability of the dynamic reactive power equipment is effectively utilized, unified coordination control between the dynamic reactive power equipment and reactive power equipment such as a new energy station unit and a transformer substation capacitive reactance device is realized, the static voltage stability margin of a power grid is improved, and reactive power support is provided for new energy consumption and delivery.
Referring to fig. 1, the dynamic reactive power coordination control method for the new energy collection area based on power generation trend prediction comprises the following specific steps:
s1: constructing a power grid model of a new energy collection area, acquiring a bus set to be monitored, and determining a b-th transformer station in the new energy collection area to which an s-th bus to be monitored belongs;the method comprises the steps of carrying out a first treatment on the surface of the S represents the total number of buses in the power grid to be monitored;the method comprises the steps of carrying out a first treatment on the surface of the B represents the total number of substations in the new energy collection area; determining the common under the b-th transformer substation according to the topological structure of the power grid modelNew energy power plants; initializing sampling times i=0;
s2: reading the current sampling periodAcquiring the state of an s-th bus to be monitored, the state of capacitive reactance equipment in a b-th transformer substation, the state of dynamic reactive equipment, the state of a new energy power plant unit and reactive voltage sensitivity information from a power grid model section at the sampling moment;
s3: according to the sub-category of the b-th substationGenerating forecast information of each new energy power plant and acquiring the first sampling periodGenerating trend of b-th transformer substation under sampling timeThe method comprises the steps of carrying out a first treatment on the surface of the The power generation trend comprises a rising stage, a falling stage, a peak stage and a valley stage;
s4: according to the state of the s-th bus to be monitored, acquiring a voltage sampling value of the s-th bus to be monitored, comparing the voltage sampling value with a preset voltage upper limit value and a preset voltage lower limit value, and judging whether the current voltage of the s-th bus to be monitored is out of limit;
S5: if the voltage sampling value is not greater than the preset voltage lower limit value or not less than the preset voltage upper limit value, judging that the current s bus voltage to be monitored is out of limit, and entering a b-th substation bus voltage correction control mode, wherein the method comprises the following steps of: if the power generation trend is in an ascending stage or a descending stage, selecting and adjusting target capacitive reactance equipment to eliminate the s-th bus voltage out-of-limit to be monitored; if the power generation trend is in a peak stage or a valley stage, selecting and adjusting target dynamic reactive equipment to eliminate the s-th bus voltage out-of-limit to be monitored; if the voltage sampling value is larger than the preset voltage lower limit value and smaller than the preset voltage upper limit value, judging that the current s bus voltage to be monitored is not out of limit, and entering a b-th substation bus voltage optimization control mode, wherein the method comprises the following steps of: if the power generation trend is in an ascending stage or a descending stage, selecting and adjusting target capacitive reactance equipment to realize the busbar voltage optimization target to be monitored; if the power generation trend is in a peak stage or a valley stage and the new energy power plant unit has the adjusting capability, selecting and adjusting the target new energy power plant unit to realize the busbar voltage optimization target to be monitored; if the adjusting capacity of the new energy power plant unit is used up, selecting and adjusting target dynamic reactive power equipment to realize the busbar voltage optimization target to be monitored;
S5-1: if the power generation trend is in an ascending stage or a descending stage, marking the capacitive reactance equipment in a hot standby state as optional capacitive reactance equipment according to the state of the capacitive reactance equipment in the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different selectable capacitive reactance devices are put into a power grid; selecting target capacitive reactance equipment according to corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, a current voltage sampling value of an s-th bus to be monitored, a preset voltage upper limit value and a preset voltage lower limit value; changing the state of target capacitive reactance equipment to change the voltage value of the s bus to be monitored, and eliminating the out-of-limit voltage of the s bus to be monitored;
s5-2: if the power generation trend is in a peak stage or a valley stage, marking the dynamic reactive equipment which is in an operating state and has the adjusting capability as optional dynamic reactive equipment according to the state of the dynamic reactive equipment in the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different optional dynamic reactive devices are put into a power grid; selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable dynamic reactive power equipment is put into operation, the current voltage sampling value of the s th bus to be monitored, the preset voltage upper limit value and the preset voltage lower limit value; changing the state of the target dynamic reactive power equipment to change the voltage value of the s bus to be monitored, and eliminating the out-of-limit voltage of the s bus to be monitored;
S5-3: if the power generation trend is in an ascending stage or a descending stage, marking the capacitive reactance equipment in a hot standby state as optional capacitive reactance equipment according to the state of the capacitive reactance equipment in the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different selectable capacitive reactance devices are put into a power grid; selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, and the current voltage sampling value and the voltage optimizing value of the s-th bus to be monitored; changing the state of target capacitive reactance equipment to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored;
s5-4: if the power generation trend is in a peak stage or a valley stage and the new energy power plant unit has the adjusting capability, marking the new energy power plant unit which is in an operating state and has the adjusting capability as an optional new energy power plant unit according to the new energy power plant state subordinate to the b-th transformer substation; determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive adjustment quantity when the optional new energy power plant unit is put into a power grid; selecting a target new energy power plant unit according to the corresponding voltage variation when different selectable new energy power plant units are put into, and the current voltage sampling value and the voltage optimizing value of the s th bus to be monitored; changing the state of a target new energy power plant unit to change the voltage value of the s bus to be monitored, and realizing the voltage optimization target of the s bus to be monitored;
S6: let i=i+1, repeat steps S2 to S5 until，And the total sampling time in one sampling date is represented, and automatic voltage control of the s-th bus to be monitored in the b-th transformer station of the new energy collection area under all sampling time in the current sampling date is realized.
Referring to fig. 2, a schematic diagram of a new energy collection area power grid structure is shown; the new energy collection area is equivalent to a relatively concentrated new energy area in the actual power grid, and comprises a plurality of new energy collection stations, and after the new energy power plant generates electricity, the new energy power plant can realize the internet power transmission through different new energy collection stations.
Specifically, at date ofInitializing the first of i=0Sampling time, comprising:
s201: setting the automatic voltage control period of the power grid as；
S202: setting the date of the power grid asReading a power grid modelAnd 0 th: initial section at time 00;
the initial sectionThe system comprises bus state, capacitive reactance equipment state and dynamic reactive equipment state which need to be monitored in a power grid, and unit state and reactive voltage sensitivity information of a new energy power plant;
initial section；
Wherein the subscript m indicates that the grid date isA corresponding state at the time; subscript 0 indicates that it is the current dateA state corresponding to the sampling time;
S202-1: setting the serial number of the bus needing to be monitored in the power grid asThe method comprises the steps of carrying out a first treatment on the surface of the S represents the total number of bus bars in the grid that need to be monitored;
represent the firstThe initial state information of the s-th bus to be monitored at the moment is expressed as follows:
；
wherein,the new energy collection area transformer substation bus which indicates the s th bus to be monitored is at the s th busThe state of the moment of time,the new energy power plant bus which indicates the s th bus needs to be monitored is at the s th busA state of time.
S202-2: setting serial number of capacitive reactance device in power grid as；Representing the total number of capacitive reactance devices in the electrical grid;
represent the firstThe initial state information of the moment capacitive reactance is expressed as:
；
wherein,indicating that the r-th capacitive reactance switch is at the r-thThe operating state of the time of day,indicating that the r-th capacitive reactance is at the firstThe reactive power sampled value at the moment,indicating the rated capacity of the nth capacitive reactance.
S202-3: setting the serial number of dynamic reactive power equipment in power grid as；Representing the total number of dynamic reactive devices in the power grid;
represent the firstThe initial state information of the dynamic reactive equipment at the moment is expressed as:
；
wherein,indicating that the t-th dynamic reactive equipment is at the t-thThe reactive power sampled value at the moment,representing the reactive lower limit value of the t-th dynamic reactive device,representing the reactive upper limit of the t-th dynamic reactive device, And representing the reactive power reserve set value of the t-th dynamic reactive power equipment.
S202-4: setting the serial number of a new energy power plant unit in a power grid as；Representing new in the gridThe total number of energy power plant units;
represent the firstThe initial state information of the new energy power plant unit at the moment is expressed as:
；
wherein,indicating that the g new energy power plant is arranged at the gThe active information of the moment of time,indicating that the g new energy power plant is arranged at the gReactive information of moment;
，indicating that the g new energy power plant is arranged at the gThe reactive power sampled value at the moment,represents the reactive lower limit value of the g new energy power plant unit,and (5) representing the reactive upper limit value of the g new energy power plant unit.
S202-5: setting new energyThe sensitivity of the source unit to the busbar voltage of the new energy power plant isThe sensitivity of the new energy unit to the busbar voltage of the transformer substation in the new energy collecting area is as followsThe method comprises the steps of carrying out a first treatment on the surface of the Sensitivity of new energy collection area transformer substation capacitive reactance to new energy collection area transformer substation bus voltageThe method comprises the steps of carrying out a first treatment on the surface of the Sensitivity of dynamic reactive power equipment to bus voltage of new energy collection area transformer substationThe method comprises the steps of carrying out a first treatment on the surface of the Thus, the firstReactive voltage sensitivity information for time of dayExpressed as:；
setting the firstReactive power adjustment quantity of g new energy power plant unit at moment is Then there is:
；reactive power adjustment for g-th new energy power plant unitWhen the voltage change quantity of the new energy power plant bus to be monitored is the s th;
setting the firstReactive power adjustment quantity of g new energy power plant unit at moment isThen there is:
；reactive power adjustment for g-th new energy power plant unitWhen the voltage variation of the new energy collection area transformer substation bus to be monitored is the s th;
setting the firstThe reactive power adjustment quantity of the r-th capacitive reactance at the moment isThen there is:
；representing the reactive power adjustment of the r-th capacitive reactanceWhen the voltage variation of the new energy collection area transformer substation bus to be monitored is the s th;
setting the firstThe reactive power adjustment quantity of the t-th dynamic reactive power equipment at the moment isThen there is:
；reactive power adjustment of t-th dynamic reactive power equipmentAnd when the voltage change quantity of the new energy collection area transformer substation bus to be monitored is the s th.
S203: setting a dateThe new energy power plant power generation trend prediction information is that；
S203-1: setting the serial number of the new energy power plant asThe method comprises the steps of carrying out a first treatment on the surface of the N represents the total number of new energy power plants in the power grid; the new energy power plant power generation trend prediction index k represents a prediction time point,the method comprises the steps of carrying out a first treatment on the surface of the K represents the total number of the power generation trend prediction subscripts of the new energy power plant; date corresponding to power generation trend prediction subscript k Each predicted time point being spaced by the same preset time interval;
；
wherein,generating trend prediction information of the nth new energy power plant in the kth index is represented;
s203-2: setting upThe serial number of the new energy collection area transformer substation isThe method comprises the steps of carrying out a first treatment on the surface of the B represents the total number of new energy collection area substations. The new energy power plant range under the transformer substation can be determined through topology analysis of the new energy collection area power grid, and the power generation prediction information of the b new energy collection area transformer substation can be obtained through superposition of the power generation prediction information of the new energy power plant under the transformer substationExpressed as:
；
wherein,indicating the date of the substation in the b new energy collection areaIs provided with the power generation prediction information of (a),representing the serial number of a new energy power plant subordinate to a substation in a b new energy collection area;representing the total number of new energy power plants subordinate to the b new energy collection area transformer substation;generating trend prediction information of the kth subscript of the nth new energy power plant subordinate to the substation in the b new energy collection area is shown;
s203-3: by generating forecast information for the b new energy collection area transformer substationAnd (3) determining the power generation trend state of the substation in the kth prediction point in the b new energy collection area. Setting the b new energy The power generation trend of the transformer substation in the collecting area at the kth predicted point is thatExpressed as:
，
wherein,the generation trend of the substation in the b new energy collection area at the kth predicted point is represented as an ascending stage,the generation trend of the substation in the b new energy collection area at the kth predicted point is represented as a descending stage,the generation trend of the substation in the b new energy collection area at the kth predicted point is represented as a peak stage,and the generation trend of the substation in the b new energy collection area at the kth prediction point is in the valley stage.
S203-4: considering that each predicted point k corresponds to a dateIs not equal to the number of sampling instantsGenerating trend information of the b new energy collection area transformer substationCan be popularized as date of useSampling time of (a)Represented byExpressed as:
；
wherein,the generation trend of the substation in the b new energy collection area at the i sampling moment is represented as an ascending phase,the generation trend of the substation in the b new energy collection area at the i sampling moment is represented as a descending stage,the generation trend of the substation in the b new energy collection area at the i sampling moment is represented as a peak stage,and the generation trend of the substation in the b new energy collection area at the i sampling moment is a valley stage.
S204: read the firstInitial section information of time：；
Read the firstBus operation status information to be monitored at any timeExpressed as:
；
new energy collection area transformer substation bus running state information needing to be monitored in s thExpressed as:
；
wherein,represent the firstThe voltage sampling value of the new energy collection area transformer substation bus to be monitored at the time s,and (3) withRespectively represent the firstThe lower limit value and the upper limit value of the bus voltage of the transformer substation in the new energy collection area to be monitored at the time s,represent the firstThe new energy collection area transformer substation busbar voltage optimization value to be monitored is given by global reactive power optimization at any moment;
first, theThe judging condition of the bus voltage out-of-limit of the new energy collection area transformer substation to be monitored at the time s is as follows:or (b)；
First, theThe judging condition that the bus voltage of the new energy collection area transformer substation to be monitored at the moment s is not out of limit is as follows:；
when the bus voltage of the new energy collection area transformer substation to be monitored meets the judgment condition of out-of-limit, executing step S205, entering a new energy collection area transformer substation bus voltage correction control mode, and eliminating out-of-limit transformer substation bus voltage on the basis of reserving dynamic reactive power reserve of the new energy collection area through coordination control of transformer substation content resistor equipment and dynamic reactive power equipment.
When the bus voltage of the new energy collection area transformer substation to be monitored meets the judgment condition of no out-of-limit, the step S206 is executed, the transformer substation bus voltage optimization control mode is entered, and the transformer substation bus voltage optimization target is realized on the basis of reserving the dynamic reactive power reserve of the new energy collection area through the coordination control of the transformer substation content resistor equipment, the dynamic reactive power equipment and the new energy power plant unit.
S205: a new energy collection area transformer substation busbar voltage correction control mode;
setting the subscript b of the transformer substation where the bus of the transformer substation in the new energy collection area to be monitored is located as the sAnd when the bus voltage of the new energy collection area transformer substation to be monitored at the moment meets the judgment condition of out-of-limit, the bus voltage of the new energy collection area transformer substation is unqualified, and voltage correction control is needed to be carried out on the transformer substation bus so as to eliminate out-of-limit of the transformer substation bus voltage.
S205-1: when the voltage of the bus of the transformer substation in the new energy collection area is lower than the lower limit, namelyAt the time, detect the firstMoment b new energy collection area transformer substation power generation trend informationWhen (when)Or (b)And the active power generation rapid change stage of the new energy collection area transformer substation subordinate new energy power plant in the 'low valley-peak' or 'peak-low valley' is described. At the moment, the main task of the new energy power plant is to quickly adjust the active output in response to the power generation instruction, only a small amount of reactive voltage adjustment requirements of the new energy collection area are considered, the reactive voltage support of the new energy collection area is not large, and the reactive voltage adjustment capability of the new energy collection area transformer substation content resistor equipment is preferentially utilized to eliminate the transformer substation busbar voltage out-of-limit.
The transformer substation capacitive reactance device with large capacity is controlled to act, so that reactive voltage regulation requirements of a new energy collection area can be fully responded, strong reactive voltage support is provided for new energy consumption, and bus voltage out-of-limit of the transformer substation is rapidly eliminated; on the other hand, by preserving the regulation capability of the dynamic reactive power equipment, enough dynamic reactive power reserve is reserved for the new energy collection area as much as possible so as to cope with voltage fluctuation under the accident condition.
(1) Scanning within a b-th substationThe running state of the individual capacitive reactance device, marking the capacitive reactance device in the hot standby state as an optional capacitive reactance device, and setting the serial number of the optional capacitive reactance device in the b-th transformer substation as，；Representing the total number of selectable capacitive reactance in the substation. When (when)When a capacitive reactance device is available in the b-th substation is described.
(2) Setting optional capacitive reactance information of b-th transformer substationThe following are provided:
；
wherein,indicating that the number of optional capacitive reactance devices of the b-th substation is not greater than the total number of capacitive reactance devices.
(3) When the b-th transformer substation is inAfter the capacitive reactance devices are put into operation, the reactive power adjustment quantity is as follows:
；
according to the reactive voltage sensitivity relation of the capacitive reactance device, the corresponding voltage variation of the s-th bus in the transformer substation is as follows: ；
If the voltage of the s-th transformer substation bus meetsDescription of the first embodimentThe input strategy of the personal capacitive reactance device is checked to pass, the firstThe lower label of the personal capacitive reactance device is。
(4) Repeating the step (3) and sequentially carrying out the steps in the b-th transformer substationChecking a control strategy of each capacitive reactance, and setting the serial number of the capacitive reactance passing the check in the b-th transformer substation as，；And the total number of the capacitive reactance devices passing verification in the b-th substation is represented. Form the firstThe control strategy information of the content reactor of the substation at the moment b is as follows:
；
wherein,，representing the b-th substationControl information of the individual capacitive reactance.
(5) According to the control strategy information of the content resistor of the b-th transformer substationReactive load balancing and capacitive reactance device based on main transformer in transformer substationPrinciple of consistent action times, fromAnd selecting one of the controllable capacitive resistors for control to form a final control instruction. After the capacitive reactance device of the b-th transformer substation issuing the control instruction is selected, setting a switch of the capacitive reactance device corresponding to the control instruction as a switch according to initial state information of the capacitive reactance deviceGenerate the firstThe action instructions of the switch where the capacitive reactance is located are as follows:
；
wherein,representation control of the firstThe switch in which the individual capacitive reactance is located is closed.
By issuing the firstThe closing instruction of the switch where the capacitive reactance is positioned realizes the first And (5) a control strategy for the content resistor equipment of the b-th transformer substation at the moment. Reactive power of the transformer substation is increased by putting capacitive reactance equipment into the transformer substation, and bus voltage of the transformer substation is improved, so that the problem that the bus voltage of the transformer substation exceeds the lower limit is solved.
S205-2: when the voltage of the bus of the transformer substation in the new energy collection area is lower than the lower limit, namelyAt the time, detect the firstNew energy source at time bCollecting area transformer substation power generation trend informationWhen (when)Or (b)And the active power generation stabilization stage of the new energy collection area transformer substation subordinate to the new energy power plant at the peak or the valley is described. At the moment, the new energy power plant can partially meet the reactive voltage regulation requirement of the new energy collection area while taking into account active power generation, has a certain contribution to the reactive voltage support of the new energy collection area, preferentially utilizes the reactive voltage regulation capability of dynamic reactive equipment in a transformer substation of the new energy collection area, and eliminates the bus voltage out-of-limit of the transformer substation.
The dynamic reactive power equipment with continuously adjustable control actions can respond to the reactive voltage requirement of the new energy collection area in the active power generation stable stage more accurately on one hand, and provide flexible and changeable reactive voltage support for new energy consumption and delivery; on the other hand, the operation times of the transformer substation content reactor equipment are reduced as much as possible, so that the service life of the content reactor equipment is prolonged.
(1) Scanning within a b-th substationThe running state of each dynamic reactive power equipment is marked, the dynamic reactive power equipment which is in the running state and has the adjusting capability is selected as the optional dynamic reactive power equipment, and the serial number of the optional dynamic reactive power equipment in the b-th transformer substation is set as，；Representing the total number of optional dynamic reactive devices in the substation whenAnd when the dynamic reactive equipment is available in the b-th substation. The optional dynamic reactive power equipment needs to meet the following conditions:and is also provided with。
(2) Setting optional dynamic reactive equipment information of b-th substationThe following are provided:
；
wherein,indicating that the number of optional dynamic reactive devices in the b-th substation is not greater than the total number of dynamic reactive devices.
(3) Setting the firstThe initial goal of the individual selectable dynamic reactive devices is reactive reserve set pointReactive power adjustmentThe method comprises the steps of carrying out a first treatment on the surface of the According to the reactive voltage sensitivity relation of the dynamic reactive power equipment, the corresponding bus voltage variation of the transformer substation is as follows:；
(4) setting the firstReactive power setting target value of each selectable dynamic reactive power equipment is as followsInitial defaultFor the firstAnd (3) checking the control strategy of each optional dynamic reactive power equipment:
according to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditions Description of the first embodimentThe control strategy of each optional dynamic reactive equipment is checked to pass, and the first is markedSubscript of each selectable dynamic reactive device is。
At this time, the firstThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:
，
wherein,first, theReactive target value of individual selectable dynamic reactive equipmentEqual to the reactive reserve value.
According to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsDescription of the first embodimentThe control strategy check of the individual optional dynamic reactive devices needs to be adjusted, at this time, the firstThe reactive power targets of the individual selectable dynamic reactive power devices cannot be directly adjusted to reactive power reserve values by the following adjustment method:
according to the reactive voltage sensitivity relation of the dynamic reactive power equipment, when the voltage variation of the s-th bus of the b-th transformer substationWhen corresponding to the firstReactive power adjustment of individual selectable dynamic reactive power equipmentThe method comprises the following steps:
；
at this time, mark the firstSubscript of each selectable dynamic reactive device isFirst, theThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:；
wherein,first, theThe reactive target value of the individual selectable dynamic reactive devices is less than the reactive reserve value.
According to the change of the bus voltage of the transformer substationIf at the first The voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsDescription of the first embodimentThe control strategy check of the individual optional dynamic reactive devices needs to be adjusted, at this time, the firstReactive target of individual selectable dynamic reactive devices is adjusted to reactive reserve valueThe voltage regulation requirement cannot be met, more dynamic reactive power is required to be used for eliminating the out-of-limit of the bus voltage of the transformer substation, and the regulation method is as follows:
according to the reactive voltage sensitivity relation of the dynamic reactive power equipment, when the voltage variation of the s-th bus of the b-th transformer substationWhen corresponding to the firstReactive power adjustment of individual selectable dynamic reactive power equipmentThe method comprises the following steps:
；
the calculated reactive power adjustment amount is neededChecking when the firstIndividual optional dynamic reactive devicesAfter adjustment, the reactive power is larger than the reactive power maximum value of the dynamic reactive power equipmentCorrection ofThe following are provided:
；
at this time, mark the firstSubscript of each selectable dynamic reactive device isFirst, theThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:；
wherein,first, theThe reactive target value of each optional dynamic reactive equipment is larger than the reactive reserve value and smaller than or equal to the reactive maximum value of the dynamic reactive equipment.
(5) Repeating the step (4), in the first stepIn station b at timeSequentially generating control strategies by the optional dynamic reactive power equipment, and setting the serial number of the dynamic reactive power equipment passing verification in the b-th transformer substation as ，；Representing the total number of dynamic reactive power equipment generating control strategies in the transformer substation and forming control strategy information of the dynamic reactive power equipment in the b-th transformer substationThe following are provided:
；
wherein,，representing the b-th substationReactive target values of the individual dynamic reactive devices.
(6) According to the firstDynamic reactive equipment control strategy information in time b-th transformer substationAccording to the principle that reactive load balance of main transformer in transformer substation and reactive output of dynamic reactive equipment are consistent, the method comprises the following steps ofAnd selecting one of the optional dynamic reactive power equipment for control to form a final control instruction. Setting the firstThe dynamic reactive equipment subscript corresponding to the control instruction in the b-th substation at the moment is as follows，Is the firstControl instructions of the dynamic reactive power equipment:
；
by issuing the firstControl instructions of the dynamic reactive power equipment are realized on the firstAnd (3) a control strategy of dynamic reactive equipment in the substation at the moment b. And the reactive power of dynamic reactive power equipment in the transformer substation is input, so that the bus voltage of the transformer substation is improved, and the problem that the bus voltage of the transformer substation exceeds the lower limit is solved.
S206: the new energy collection area transformer substation busbar voltage optimizing control mode;
setting the firstThe subscript of the transformer substation where the s new energy collecting area transformer substation buses needing to be monitored are located is b, and when the new energy collecting area transformer substation buses are located And when the bus voltage of the new energy collection area transformer substation to be monitored at the moment meets the judgment condition of no out-of-limit, the bus voltage of the new energy collection area transformer substation is qualified, and the bus voltage optimization target value given by global optimization is required to be tracked, so that the bus voltage optimization control is performed.
S206-1: when the busbar voltage of the transformer substation in the new energy collection area is lower than the optimized value, namelyAt the time, detect the firstMoment b new energy collection area transformer substation power generation trend informationWhen (when)Or (b)And the active power generation rapid change stage of the new energy collection area transformer substation subordinate new energy power plant in the 'low valley-peak' or 'peak-low valley' is described. At the moment, the main task of the new energy power plant is to quickly adjust the active output in response to the power generation instruction, only a small amount of reactive voltage adjustment requirements of the new energy collection area are considered, the reactive voltage support of the new energy collection area is not large, and the reactive voltage adjustment capability of the new energy collection area transformer substation content resistor equipment is preferentially utilized to achieve the transformer substation busbar voltage optimization target.
The transformer substation capacitive reactance device with large capacity is controlled to act, so that reactive voltage regulation requirements of a new energy collection area can be fully responded, strong reactive voltage support is provided for new energy consumption and transmission, and a transformer substation bus voltage optimization target is achieved; on the other hand, by preserving the regulation capability of the dynamic reactive power equipment, enough dynamic reactive power reserve is reserved for the new energy collection area as much as possible so as to cope with voltage fluctuation under the accident condition.
(1) Scanning within a b-th substationThe running state of the individual capacitive reactance device, marking the capacitive reactance device in the hot standby state as an optional capacitive reactance device, and setting the serial number of the optional capacitive reactance device in the b-th transformer substation as，；Representing the total number of selectable capacitive reactance in the substation. When (when)When a capacitive reactance device is available in the b-th substation is described.
(2) Setting optional capacitive reactance information of b-th transformer substationThe following are provided:
；
wherein,indicating that the number of optional capacitive reactance devices of the b-th substation is not greater than the total number of capacitive reactance devices.
(3) When the b-th transformer substation is inAfter the capacitive reactance devices are put into operation, the reactive power adjustment quantity is as follows:
；
according to capacitive reactance deviceReactive voltage sensitivity relation, and the voltage variation of the corresponding s-th bus in the transformer substation is as follows:；
if the voltage of the s-th transformer substation bus meetsDescription of the first embodimentThe input strategy of the personal capacitive reactance device is checked to pass, the firstThe lower label of the personal capacitive reactance device is。
(4) Repeating the step (3) and sequentially carrying out the steps in the b-th transformer substationChecking a control strategy of each capacitive reactance, and setting the serial number of the capacitive reactance passing the check in the b-th transformer substation as，；And the total number of the capacitive reactance devices passing verification in the b-th substation is represented. Form the firstThe control strategy information of the content reactor of the substation at the moment b is as follows:
；
Wherein,，is the b-th substationControl information of the individual capacitive reactance.
(5) According to the control strategy information of the content resistor of the b-th transformer substationAccording to the principle that reactive load balance of main transformer in transformer substation and action times of capacitive reactance equipment are consistent, the method comprises the following steps ofAnd selecting one of the controllable capacitive resistors for control to form a final control instruction. After the capacitive reactance device of the b-th transformer substation issuing the control instruction is selected, setting a switch of the capacitive reactance device corresponding to the control instruction as a switch according to initial state information of the capacitive reactance deviceGenerate the firstThe action instructions of the switch where the capacitive reactance is located are as follows:
；
wherein,representation control of the firstThe switches of the individual capacitive reactance devices are closed.
By issuing the firstThe closing instruction of the switch where the capacitive reactance is positioned realizes the firstAnd (5) a control strategy for the content resistor equipment of the b-th transformer substation at the moment. Reactive power of the transformer substation is increased by throwing capacitive reactance equipment, bus voltage of the transformer substation is improved, and the bus voltage optimization target of the transformer substation is achieved.
S206-2: when the busbar voltage of the transformer substation in the new energy collection area is lower than the optimized value, namelyAt the time, detect the firstMoment b new energy collection area transformer substation power generation trend informationWhen (when)Or (b)And the active power generation stabilization stage of the new energy collection area transformer substation subordinate to the new energy power plant at the peak or the valley is described. At the moment, the new energy power plant can partially meet the reactive voltage regulation requirement of the new energy collection area while taking active power generation into consideration, and has a certain contribution to the reactive voltage support of the new energy collection area, the reactive voltage regulation capability of dynamic reactive equipment in a new energy power plant unit or a transformer substation in the new energy collection area is preferentially utilized, and the busbar voltage optimization target of the transformer substation is realized.
The new energy power plant unit or dynamic reactive equipment with continuously adjustable control actions can respond to the reactive voltage demand of the new energy collection area in the active power generation stable stage more accurately on one hand, and flexible and changeable reactive voltage support is provided for new energy consumption and delivery; on the other hand, the operation times of the transformer substation content reactor equipment are reduced as much as possible, so that the service life of the content reactor equipment is prolonged.
In order to guarantee the maximum dynamic reactive power reserve margin of the new energy collection area, the reactive power of the new energy power plant unit is preferably selected and adjusted, and the problem of optimizing the bus voltage of the transformer substation is solved; and only when the reactive power regulation of the new energy power plant unit is used up, the reactive power of the dynamic reactive power equipment in the transformer substation is used for realizing the transformer substation bus voltage optimization target.
S206-2-1: when the new energy power plant unit has reactive power regulation capability, the new energy power plant unit is utilized to realize the substation bus voltage optimization target in a reactive mode;
(1) scanning the b-th substation subordinateThe running state of each new energy power plant unit is marked, the new energy power plant unit which is in the running state and has the adjusting capability is used as an optional new energy power plant unit, and the serial number of the new energy power plant unit subordinate to the b-th transformer substation is set as ，；Indicating the total number of new energy power plant units under the transformer substation, whenAnd when the new energy power plant unit is available, the b-th transformer substation is indicated. The optional new energy power plant unit needs to meet the following requirements:
and is also provided with。
(2) Setting unit information of optional new energy power plant of b-th transformer substationThe following are provided:
；
wherein,the number of the optional new energy power plant units subordinate to the b-th transformer substation is not larger than the total number of the new energy power plant units.
(3) According to the reactive voltage sensitivity relation of the new energy power plant unit, when the voltage variation of the s bus of the b-th transformer substation isWhen the system is used, the total reactive power adjustment quantity of the new energy power plant unit subordinate to the b-th transformer substation is correspondingThe method comprises the following steps:
；
counting total reactive power regulation capacity of unit of new energy power plant subordinate to b-th transformer substationThe following are provided:
；
reactive power regulation demand calculatedChecking whenIs greater than the total reactive power regulation capability of the new energy power plant unitWhen the total reactive power regulation requirement exceeds the total reactive power regulation capability of the current new energy power plant unit, the reactive power regulation requirement is corrected；
(4) According to the total reactive power regulation requirement of the new energy power plant obtained in the step (3)According to the reactive power balance principle of the new energy power plant unit, the total reactive power regulation requirement is setAnd the new energy power plant units are distributed to each new energy power plant unit. Setting the first Reactive power increment distributed by each new energy power plant unit isThe subscript of the new energy power plant unit is marked asObtaining the subordinate of the b-th transformer substationReactive target value of each new energy power plant unitThe method comprises the following steps:；
wherein,represent the firstReactive power increment of the new energy power plant unit.
(5) Generating control strategy information of new energy power plant unit subordinate to b-th transformer substationExpressed as:；
by issuingControl instructions of reactive target values of new energy power plant units are realizedAnd the b-th transformer station belongs to a control strategy of a new energy power plant unit. And the reactive power of a unit of a new energy power plant subordinate to the transformer substation is increased, so that the bus voltage of the transformer substation is improved, and the bus voltage optimization target of the transformer substation is realized.
S206-2-2: when the reactive power regulation capacity of the new energy power plant unit is exhausted, the reactive power of dynamic reactive power equipment in the transformer substation is utilized to realize the transformer substation bus voltage optimization target;
(1) scanning within a b-th substationThe running state of each dynamic reactive power equipment is marked, the dynamic reactive power equipment which is in the running state and has the adjusting capability is selected as the optional dynamic reactive power equipment, and the serial number of the optional dynamic reactive power equipment in the b-th transformer substation is set as，；Representing the total number of optional dynamic reactive devices in the substation when And when the dynamic reactive equipment is available in the b-th substation. The optional dynamic reactive power equipment needs to meet the following conditions:and is also provided with。
(2) Setting optional dynamic reactive equipment information of b-th substationThe following are provided:
；
wherein,indicating that the number of optional dynamic reactive devices in the b-th substation is not greater than the total number of dynamic reactive devices.
(3) Setting the firstThe initial goal of the individual selectable dynamic reactive devices is reactive reserve set pointReactive power adjustmentThe method comprises the steps of carrying out a first treatment on the surface of the According to the reactive voltage sensitivity relation of the dynamic reactive power equipment, the corresponding bus voltage variation of the transformer substation is as follows:；
(4) setting the firstReactive power setting target value of each selectable dynamic reactive power equipment is as followsInitial defaultFor the firstAnd (3) checking the control strategy of each optional dynamic reactive power equipment:
according to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsDescription of the first embodimentThe control strategy of each optional dynamic reactive equipment is checked to pass, and the first is markedSubscript of each selectable dynamic reactive device is。
At this time, the firstThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:
，
wherein,first, theThe reactive target value of the individual selectable dynamic reactive devices is equal to the reactive reserve value.
According to the change of the bus voltage of the transformer substationIf at the firstThe voltage of the s-th bus of the b-th transformer substation at the moment meets the following conditionsDescription of the first embodimentPersonal canThe control strategy check of the selected dynamic reactive power equipment needs to be adjusted, at the moment, the firstThe reactive power targets of the individual selectable dynamic reactive power devices cannot be directly adjusted to reactive power reserve values by the following adjustment method:
according to the reactive voltage sensitivity relation of the dynamic reactive power equipment, when the voltage variation of the s-th bus of the b-th transformer substationWhen corresponding to the firstReactive power adjustment of individual selectable dynamic reactive power equipmentThe method comprises the following steps:
；
at this time, mark the firstSubscript of each selectable dynamic reactive device isFirst, theThe reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows:；
wherein,first, theThe reactive target value of the individual selectable dynamic reactive devices is less than the reactive reserve value.
(5) Repeating the step (4),in the first placeTime of day for the b-th substationSequentially generating control strategies by the optional dynamic reactive power equipment, and setting the serial number of the dynamic reactive power equipment passing verification in the b-th transformer substation as，；Representing the total number of dynamic reactive power equipment generating control strategies in the transformer substation and forming control strategy information of the dynamic reactive power equipment in the b-th transformer substationThe following are provided:
；
wherein, ，Representing the b-th substationControl instruction information of the dynamic reactive equipment.
(6) According to the firstDynamic reactive equipment control strategy information in time b-th transformer substationReactive load balancing and dynamic reactive equipment based on main transformer in transformer substationReactive force consistent principle, slaveAnd selecting one of the optional dynamic reactive power equipment for control to form a final control instruction. Setting the firstThe dynamic reactive equipment subscript corresponding to the control instruction in the b-th substation at the moment is as follows，Is the firstControl instruction information of each dynamic reactive power equipment:
；
wherein,representing the b-th substationReactive target values of the individual dynamic reactive devices.
By issuing the firstControl instructions of the dynamic reactive power equipment are realized on the firstAnd (3) a control strategy of dynamic reactive equipment in the substation at the moment b. And the reactive power of dynamic reactive power equipment in the transformer substation is increased, so that the bus voltage of the transformer substation is improved, and the bus voltage optimization target of the transformer substation is realized.
S207: the control of step S205 and step S206 is performed to obtain the power grid on the first stageTime of day operation state information.
S207-1: setting the new energy collection area transformer substation bus to be monitored in the sTime of day operating state：
；
Wherein,the new energy collection area transformer substation bus which indicates the s th bus to be monitored is at the s th bus The state of the moment of time,new energy power plant bus for representing new energy collection area to be monitored in the s th sectionThe state at the time is expressed as:
；
；
s207-2: in the first placePower generation prediction trend information of new energy collection area transformer substation at moment bExpressed as:
；
s207-3: setting the content resistor equipment of the b new energy collection area transformer substation in the b new energy collection areaTime of day operating stateExpressed as:
；
s207-4: setting the dynamic reactive equipment in the b new energy collection area transformer substation in the b new energy collection areaTime of day operating stateExpressed as:
；
s207-5: setting the b new energy collection area transformer substation subordinate new energy power plant unit at the b new energy collection areaThe time of day operating state is expressed as:
；
s208: in the first placeAt time, the power grid acquired by S207 is at the firstThe running information at moment is updated to obtain the initial section, and the power grid is obtained at the first stageIn the initial state of the moment, the steps S204-S207 are repeated, thereby realizing that the power grid is at the first stageThe automatic voltage control process at the moment, the corrected or optimized power grid state is the firstAn initial state of time;
s209: let i=i+1, use the obtained grid at the firstTime of day operation information, update the firstThe initial section at the moment is obtained to obtain the power grid at the first stageThe initial state of moment, thereby realizing the power grid at the first Automatic voltage control process at time until，Representing the total number of sampling time in one sampling period to realize the date of the power gridAn automatic voltage control process for each sampling time.
Specifically, based on the above embodiment, various reactive equipment control strategies are adopted when the bus voltage of the transformer substation in the new energy collection area is lower than the lower limit; in this embodiment, when the bus voltage of the new energy collection area substation is higher, the control strategy is opposite to the lower limit control strategy in the above embodiment.
In particular, in the present inventionIn an embodiment of the present invention,288 is a time interval of dividing the time interval of 24h by 60min and then 5min in one sampling period, and 288 sampling moments are all obtained; corresponding to 00 when i=0: at time 00, when i=1 corresponds to 00:05 time, and so on to 24:00.
according to the new energy collection area dynamic reactive power coordination control method based on power generation trend prediction, the voltage sampling value of the s-th bus to be monitored is compared with the preset voltage upper limit value and the preset voltage lower limit value, and the voltage out-of-limit judgment of the s-th bus to be monitored is carried out; when the s-th bus to be monitored is not out of limit, entering a bus voltage optimization control mode of a transformer substation in a new energy collection area, and realizing a bus voltage optimization target of the transformer substation on the basis of reserving dynamic reactive power storage in the new energy collection area through coordination control of b-th transformer substation content resistor equipment, dynamic reactive power equipment and a new energy power plant unit; when the s-th bus to be monitored is out of limit, entering a new energy collection area transformer substation bus voltage correction control mode, and eliminating the problem of out-of-limit bus voltage to be monitored on the basis of reserving dynamic reactive power storage of the new energy collection area through coordination control of b-th transformer substation content resistor equipment and dynamic reactive power equipment.
According to the application, reactive power equipment is selected for control in a targeted manner when the bus voltage needs to be regulated according to the current running state and the power generation trend prediction information of the power grid. In the stage of generating rapid change, the capacitive reactance equipment with large capacity is preferentially utilized for control, and strong reactive support is provided for trending continuous reactive demand; in a stable power generation stage, the quick adjustment capability of a new energy unit or dynamic reactive equipment is fully utilized to perform reactive coordination control; the action times of capacitive reactance equipment are reduced, and the service life of the equipment is prolonged; and the quick adjustment capability of the dynamic reactive power equipment can be fully utilized, and finer adjustment requirements can be responded better. According to the application, unified coordination control among different reactive power devices in the new energy collection area based on power generation trend prediction is realized, so that the new energy collection area can keep as many dynamic reactive power reserves as possible, the static voltage stability margin of the power grid is improved, and the automatic voltage control level of the power grid is improved.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (14)
1. The dynamic reactive power coordination control method for the new energy collection area based on power generation trend prediction is characterized by comprising the following steps of:
s1: constructing a power grid model of a new energy collection area, acquiring a bus set to be monitored, and determining a b-th transformer station in the new energy collection area to which an s-th bus to be monitored belongs; s=1, 2, …, S; s represents the total number of buses in the power grid to be monitored; b=1, …, B; b represents the total number of substations in the new energy collection area; determining the common under the b-th transformer substation according to the topological structure of the power grid modelNew energy power plants; initializing sampling times i=0;
s2: reading the current sampling periodAcquiring the state of an s-th bus to be monitored, the state of capacitive reactance equipment in a b-th transformer substation, the state of dynamic reactive equipment, the state of a new energy power plant unit and reactive voltage sensitivity information from a power grid model section at the sampling moment;
s3: according to the sub-category of the b-th substationGenerating forecast information of each new energy power plant and acquiring the first sampling periodGenerating trend of the b-th transformer substation at sampling time; the power generation trend comprises a rising stage, a falling stage, a peak stage and a valley stage;
S4: according to the state of the s-th bus to be monitored, acquiring a voltage sampling value of the s-th bus to be monitored, comparing the voltage sampling value with a preset voltage upper limit value and a preset voltage lower limit value, and judging whether the current voltage of the s-th bus to be monitored is out of limit;
s5: if the voltage sampling value is not greater than the preset voltage lower limit value or not less than the preset voltage upper limit value, judging that the current s bus voltage to be monitored is out of limit, and entering a b-th substation bus voltage correction control mode, wherein the method comprises the following steps of: if the power generation trend is in an ascending stage or a descending stage, selecting and adjusting target capacitive reactance equipment to eliminate the s-th bus voltage out-of-limit to be monitored; if the power generation trend is in a peak stage or a valley stage, selecting and adjusting target dynamic reactive equipment to eliminate the s-th bus voltage out-of-limit to be monitored; if the voltage sampling value is larger than the preset voltage lower limit value and smaller than the preset voltage upper limit value, judging that the current s bus voltage to be monitored is not out of limit, and entering a b-th substation bus voltage optimization control mode, wherein the method comprises the following steps of: if the power generation trend is in an ascending stage or a descending stage, selecting and adjusting target capacitive reactance equipment to realize the busbar voltage optimization target to be monitored; if the power generation trend is in a peak stage or a valley stage and the new energy power plant unit has the adjusting capability, selecting and adjusting the target new energy power plant unit to realize the busbar voltage optimization target to be monitored; if the adjusting capacity of the target new energy power plant unit is used up, selecting and adjusting target dynamic reactive power equipment to realize the busbar voltage optimization target to be monitored;
S6: let i=i+1, repeat steps S2 to S5 until，/>And the total sampling time in one sampling date is represented, and automatic voltage control of the s-th bus to be monitored in the b-th transformer station of the new energy collection area under all sampling time in the current sampling date is realized.
2. The dynamic reactive power coordination control method for a new energy collection area based on power generation trend prediction according to claim 1, wherein the method comprises the following steps in step S2:
reading the current sampling dateMiddle->Grid model section at sampling moment ∈>Acquiring the state +.>Capacitive reactance device status of the b-th substation->Dynamic reactive device status->And the state of a new energy power plant unit>And reactive voltage sensitivity information +.>；
Section of power grid modelExpressed as: />；
Wherein the subscript m indicates that the grid date isA corresponding state at the time; subscript i indicates +.>A state corresponding to the moment; when initializing i=0, representing a state corresponding to the 0:00 sampling time in the current date;
indicate->The initial state information of the s-th bus to be monitored at the moment is expressed as follows:
；
wherein,the b-th substation bus indicating that the s-th substation bus needs to be monitored is at +. >A state of time;，/>indicate->Voltage sampling value of the s-th bus to be monitored in the b-th transformer station at moment +.>And->Respectively represent +.>Preset voltage lower limit value and preset voltage upper limit value of the s-th bus to be monitored in the b-th transformer substation at moment +.>Indicate->Electric of the s-th bus to be monitored in the b-th substation at momentA pressure optimization value; />Indicating that the new energy power plant bus of the new energy collection area to be monitored in the s th strip is at the +.>A state of time;
indicate->The initial state information of the moment capacitive reactance device is expressed as:
；
wherein,indicating that the r-th capacitive reactance switch is in the +.>Time of day operating state->Indicating that the r-th capacitive reactance is at the firstReactive value of time,/->Representing the rated capacity of the r-th capacitive reactance; r represents the serial number of the capacitive reactance device in the electric network, r=1, 2, …, R; r represents the total number of capacitive reactance devices in the grid;
indicate->The initial state information of the dynamic reactive equipment at the moment is expressed as:
；
wherein,indicating that the t-th dynamic reactive device is at +.>Reactive value of time,/->Reactive lower limit value representing the t-th dynamic reactive device,/->Reactive upper limit value representing the t-th dynamic reactive device,/->Representing reactive reserve set values of the t-th dynamic reactive equipment; t represents the serial number of the dynamic reactive equipment in the power grid, t=1, 2, …, T; t represents the total number of dynamic reactive devices in the grid;
Indicate->The initial state information of the new energy power plant unit at the moment is expressed as:
；
wherein,indicating that the g new energy power plant unit is in the +.>Active information of time of day->Indicating that the g new energy power plant unit is in the +.>Reactive information of moment; g represents the serial number of a new energy power plant unit in the power grid, and g=1, 2, … and G; g represents the total number of new energy power plant units in the power grid; />，/>Indicating that the g new energy power plant unit is in the +.>Reactive value of time,/->Representing the reactive lower limit value of the g new energy power plant unit, < ->Representing the reactive upper limit value of the g new energy power plant unit;
indicate->Reactive voltage sensitivity information at the time is expressed as:
；
wherein,the sensitivity of the new energy power plant unit to the new energy power plant bus voltage is represented; />The sensitivity of the new energy power plant unit to the busbar voltage of the transformer substation in the new energy collection area is shown; />The sensitivity of the transformer substation capacitive reactance device in the new energy collection area to the busbar voltage of the transformer substation in the new energy collection area is shown; />And the sensitivity of the dynamic reactive power equipment to the bus voltage of the transformer substation in the new energy collection area is shown.
3. The dynamic reactive power coordination control method for a new energy collection area based on power generation trend prediction according to claim 2, wherein in step S3, the method comprises:
Determining the common under the b-th transformer substation according to the topological structure of the power grid modelNew energy power plants;
by superposition ofGenerating forecast information of each new energy power plant, and acquiring the sample date +.>Is>：/>；
The new energy power plant power generation trend prediction index K represents a prediction point, and k=1, … and K; k represents the total number of the power generation trend prediction subscripts of the new energy power plant;a new energy power plant serial number subordinate to the b-th transformer substation is represented; />Representing the total number of new energy power plants subordinate to the b-th substation; />No. j representing the sub-genus of the b-th substation>Generating trend prediction information of the new energy power plant at the kth prediction point;
by generating predictive information for the b-th substationThe power generation trend state of the b-th transformer substation at the kth predicted point is obtained; setting the power generation trend of the b-th transformer substation at the kth predicted point as +.>Expressed as:；
wherein,、/>、/>and->The power generation trend of the b-th transformer substation at the kth predicted point is respectively represented as an ascending stage, a descending stage, a peak stage and a valley stage;
the predicted point k represents the sampling dateEach predicted point k corresponds to a date +.>Is +.>Then according to the power generation trend information of the b-th substation- >Date of acquisition->Sampling time +.>Indicated power generation trend information->Expressed as:
；
wherein,、/>、/>and->Respectively represent that the b-th transformer substation is at the +.>The power generation trend at the sampling moment is an ascending phase, a descending phase, a peak phase and a valley phase.
4. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 2, wherein the relationship among reactive voltage sensitivity information, voltage variation and reactive power variation comprises:
setting the firstReactive power adjustment quantity of g new energy power plant unit at moment is +.>Then there is:
；/>reactive power adjustment of g new energy power plant unit>When the voltage change quantity of the new energy power plant bus to be monitored is the s th;
setting the firstReactive power adjustment quantity of g new energy power plant unit at moment is +.>Then there is:
；/>reactive power adjustment of g new energy power plant unit>When the new energy collection area transformer substation bus to be monitored is in the s state, namely the voltage variation of the bus to be monitored is in the s state;
setting the firstThe reactive power adjustment quantity of the r-th capacitive reactance at the moment is +.>Then there is:
；/>representing the reactive adjustment of the r-th capacitive reactance +.>When the voltage variation of the s th bus to be monitored is changed;
Setting the firstThe reactive power adjustment of the dynamic reactive power equipment at time t is +.>Then there is:
；/>representing the t-th dynamic reactive power equipment reactive power adjustment +.>And the s th busbar to be monitored is subjected to voltage variation.
5. The method for dynamic reactive power coordination control of a new energy collection area based on power generation trend prediction according to claim 4, wherein if the power generation trend is in a rising phase or a falling phase, selecting and adjusting a target capacitive reactor device to eliminate bus voltage out-of-limit to be monitored comprises:
if the power generation trend is in an ascending stage or a descending stage, marking the capacitive reactance equipment in a hot standby state as optional capacitive reactance equipment according to the state of the capacitive reactance equipment in the b-th transformer substation;
determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different selectable capacitive reactance devices are put into a power grid;
selecting target capacitive reactance equipment according to corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, a current voltage sampling value of an s-th bus to be monitored, a preset voltage upper limit value and a preset voltage lower limit value;
and changing the state of the target capacitive reactance device to change the voltage value of the s bus to be monitored, and eliminating the out-of-limit voltage of the s bus to be monitored.
6. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 5, wherein the changing the state of the target capacitive reactor device to change the voltage value of the s th bus to be monitored and eliminate the voltage out-of-limit of the s th bus to be monitored comprises:
scanning within a b-th substationThe running state of the individual capacitive reactance devices, marking the capacitive reactance devices in the hot standby state as selectable capacitive reactance devices, and setting the serial number of the selectable capacitive reactance devices in the b-th transformer substation as +.>，；/>Representing the total number of selectable capacitive reactance devices in the b-th substation; when->When the capacitive reactance device is available in the b-th transformer substation, the capacitive reactance device is indicated;
setting information of optional capacitive reactance device of b-th substationThe following are provided:
；
wherein,indicating that the number of the optional capacitive reactance devices of the b-th substation is not greater than the total number of the capacitive reactance devices;
when the b-th transformer substation is inReactive power adjustment amount after the input of the selectable capacitive reactance equipmentThe method comprises the following steps:
；
according to the sensitivity of the transformer substation capacitive reactance device in the new energy collection area to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive variation, and the voltage variation of the corresponding s th bus to be monitored is obtained as follows: / >；
If the voltage of the s th bus to be monitored meetsThen->Checking the control strategy input by the optional capacitive reactance device, passing the +.>The lower label of the individual selectable capacitive reactance device is +.>；
Sequentially to the b-th transformer substationChecking a control strategy input by the optional capacitive reactance equipment, and setting the serial number of the optional capacitive reactance equipment passing the check in the b-th transformer substation as +.>，/>；/>Indicating the total number of the optional capacitive reactance devices passing verification in the b-th substation; form->The control strategy information of the optional capacitive reactance device in the b-th substation at the moment is expressed as:
；
wherein,，/>represents +.>Control information for the individual selectable capacitive reactance devices;
according to control strategy information of optional capacitive reactance device in b-th transformer substationAccording to the principle that the reactive load balance of the main transformer and the action times of the capacitive reactance device are consistent, the main transformer is controlled by the control system from +.>Selecting one of the selectable capacitive reactance devices as a target capacitive reactance device to control, and forming a final control instruction; after the target capacitive reactance device is selected, setting a switch of the target capacitive reactance device to be +.>Generate->The action instructions of the switch where the capacitive reactance is located are as follows: />；
Wherein the method comprises the steps of Indicate control of +.>The switch where the capacitive reactance is located is closed;
by issuing the firstThe closing instruction of the switch where the capacitive reactance is located is realized +.>And (3) a control strategy of the content resistor equipment of the b-th transformer substation at any time is adopted, so that the problem of bus voltage out-of-limit to be monitored is solved.
7. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 4, wherein if the power generation trend is in a peak phase or a valley phase, selecting and adjusting a target dynamic reactive power device to eliminate bus voltage out-of-limit to be monitored, comprises:
if the power generation trend is in a peak stage or a valley stage, marking the dynamic reactive equipment which is in an operating state and has the adjusting capability as optional dynamic reactive equipment according to the state of the dynamic reactive equipment in the b-th transformer substation;
determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different optional dynamic reactive devices are put into a power grid;
selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable dynamic reactive power equipment is put into operation, the current voltage sampling value of the s th bus to be monitored, the preset voltage upper limit value and the preset voltage lower limit value;
Changing the state of the target dynamic reactive power equipment to change the voltage value of the s bus to be monitored, and eliminating the out-of-limit voltage of the s bus to be monitored.
8. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 7, wherein the changing the target dynamic reactive power equipment state to change the voltage value of the s th bus to be monitored and eliminate the voltage out-of-limit of the s th bus to be monitored comprises:
scanning within a b-th substationThe running state of each dynamic reactive power equipment is marked, the dynamic reactive power equipment which is in the running state and has the adjusting capability is selected as the optional dynamic reactive power equipment, and the serial number of the optional dynamic reactive power equipment in the b-th transformer substation is set as，/>；/>Indicating the total number of optional dynamic reactive devices in the b-th substation whenWhen the dynamic reactive equipment is available in the b-th transformer substation; the optional dynamic reactive power equipment needs to meet the following conditions:and->；
Setting optional dynamic reactive equipment information of b-th substationThe following are provided:；
wherein,indicating that the number of optional dynamic reactive devices in the b-th substation is not greater than the total number of dynamic reactive devices;
setting the firstThe initial goal of the reactive power variation of the individual selectable dynamic reactive power plant is reactive power reserve set point +. >Reactive power adjustment amount->The method comprises the steps of carrying out a first treatment on the surface of the According to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection area +.>The relation between the voltage variation and the reactive variation is obtained +.>The lower bus voltage variation is expressed as:>;
setting the firstReactive setting target value of the individual selectable dynamic reactive device is +.>Initial defaultFor->And (3) checking the control strategy of each optional dynamic reactive power equipment:
according to the s-th busbar voltage variation to be monitoredIf at->The voltage of the s-th busbar of the b-th substation at the moment satisfies +.>And->Description of the->The control strategy of the individual optional dynamic reactive device checks through, marks +.>Subscript of the individual optional dynamic reactive device +.>；
First, theReactive target value of control strategy of each selectable dynamic reactive equipment: />；
Wherein,first->The reactive target value of each selectable dynamic reactive device is equal to the reactive reserve value;
according to the change of the bus voltage of the transformer substationIf at->The voltage of the s-th busbar of the b-th substation at the moment satisfies +.>Description of the->The control strategy check of the individual optional dynamic reactive device needs to be adjusted, at this point +.>The reactive power targets of the individual selectable dynamic reactive power devices cannot be directly adjusted to reactive power reserve values by the following adjustment method:
According to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive power variation, when the voltage variation of the s-th bus to be monitored of the b-th transformer substationCorresponding to->First reactive adjustment of individual selectable dynamic reactive devicesThe method comprises the following steps:
；
at this time, mark the firstSubscript of the individual optional dynamic reactive device +.>First->The reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows: />；
Wherein,first->The reactive target value of each selectable dynamic reactive device is smaller than the reactive reserve value;
according to the change of the bus voltage of the transformer substationIf at->The voltage of the s-th busbar of the b-th substation at the moment satisfies +.>Description of the->Personal canThe control strategy check of the selected dynamic reactive power plant needs to be adjusted, at this point +.>Reactive target of the individual, optionally dynamic reactive system is set to a reactive reserve value +.>The voltage regulation requirement cannot be met, more dynamic reactive power is required to be used for eliminating the out-of-limit of the bus voltage of the transformer substation, and the regulation method is as follows:
according to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive power variation, when the voltage variation of the s-th bus of the b-th transformer substation Corresponding to->Second reactive adjustment of individual selectable dynamic reactive devicesThe method comprises the following steps:
；
for the second reactive power adjustmentCheck as->An optional dynamic reactive device to +.>After adjustment greater than the reactive maximum +.>Correction->：/>；
At this time, mark the firstSubscript of the individual optional dynamic reactive device +.>First->The reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows: />；
Wherein,first->The reactive target value of each selectable dynamic reactive equipment is larger than the reactive reserve value and smaller than or equal to the reactive maximum value of the dynamic reactive equipment;
in the first placeAt time +.>Sequentially generating control strategies by the optional dynamic reactive power equipment, and setting the dynamic reactive power passing verification in the b-th transformer substationThe device number is->，/>；/>Representing the total number of the dynamic reactive devices generating the control strategy in the b-th transformer substation, and forming the control strategy information of the dynamic reactive devices in the b-th transformer substation>The following are provided: />；
Wherein,，/>represents +.>Reactive target values of the individual dynamic reactive devices;
according to the firstDynamic reactive equipment control strategy information in time b-th transformer substation>According to the principle that reactive load balance of main transformer in transformer substation and reactive output of dynamic reactive equipment are consistent, the transformer substation is self-controlled by ∈10 >Selecting target dynamic reactive power equipment from the selectable dynamic reactive power equipment for carrying outControlling to form a final control instruction; set the->Subscript of target dynamic reactive equipment in time b substation is +>，/>Control instructions for the target dynamic reactive equipment:；
realize the first control command of the target dynamic reactive equipmentA control strategy of dynamic reactive equipment in a substation at the moment b; and the problem of out-of-limit voltage of the s-th bus to be monitored is eliminated by throwing reactive power of target dynamic reactive power equipment in the b-th transformer substation.
9. The dynamic reactive power coordination control method for a new energy collection area based on power generation trend prediction according to claim 4, wherein if the power generation trend is in a rising phase or a falling phase, selecting and adjusting a target capacitive reactance device to achieve a bus voltage optimization target to be monitored comprises:
if the power generation trend is in an ascending stage or a descending stage, marking the capacitive reactance equipment in a hot standby state as optional capacitive reactance equipment according to the state of the capacitive reactance equipment in the b-th transformer substation;
determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive variation and reactive adjustment amounts when different selectable capacitive reactance devices are put into a power grid;
Selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, and the current voltage sampling value and the voltage optimizing value of the s-th bus to be monitored;
and changing the state of the target capacitive reactance device to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored.
10. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 9, wherein the changing the state of the target capacitive reactor device to change the voltage value of the s th bus to be monitored, to achieve the s th bus to be monitored voltage optimization target, comprises:
scanning within a b-th substationThe running state of the individual capacitive reactance devices, marking the capacitive reactance devices in the hot standby state as selectable capacitive reactance devices, and setting the serial number of the selectable capacitive reactance devices in the b-th transformer substation as +.>，；/>Representing the total number of selectable capacitive reactance devices within the substation; when->When the optional capacitive reactance device is available in the b-th substation, the optional capacitive reactance device is described;
setting optional capacitive reactance device information of b-th transformer substationThe following are provided:
；
wherein,indicating that the number of the optional capacitive reactance devices of the b-th substation is not greater than the total number of the capacitive reactance devices;
When the b-th transformer substation is inAfter the optional capacitive reactance devices are put into operation, the reactive power adjustment quantity is as follows:；
according to the sensitivity of the transformer substation capacitive reactance device in the new energy collection area to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive variation is obtained +.>The voltage variation of the corresponding s th bus to be monitored is as follows: />；
If the voltage of the s th bus to be monitored meetsDescription of the->The optional capacitive reactance device is put into the policy check to pass the +.>The lower label of the individual selectable capacitive reactance device is +.>；
Check b in turnIn the transformer substationThe control strategy of the optional capacitive reactance equipment is that the serial number of the optional capacitive reactance equipment passing the verification in the b-th transformer substation is set as +.>，/>；/>Indicating the total number of the optional capacitive reactance devices passing verification in the b-th substation; then->The control strategy information of the optional capacitive reactance device in the b-th substation at the moment is expressed as: />；
Wherein,，/>represents +.>Control information for the individual selectable capacitive reactance devices;
according to control strategy information of optional capacitive reactance device in b-th transformer substationAccording to the principle that reactive load balance of main transformer in transformer substation and action times of capacitive reactance device are consistent, the reactive load balance is controlled by the reactive load balance controller from +.>Selecting target capacitive reactance equipment from the selectable capacitive reactance equipment to control, and forming a final control instruction; after the target capacitive reactance equipment in the b-th transformer substation is selected, setting a switch of the target capacitive reactance equipment to be +_ according to the initial state information of the capacitive reactance equipment >Generate->The action instructions of the switch where the capacitive reactance devices are located are as follows: /> ；
Wherein,indicate control of +.>The switch of the individual capacitive reactance devices is closed;
by issuing the firstA closing instruction of a switch where the personal capacitive reactance device is located, realizing the +.>And (3) a control strategy of the content reactor equipment of the b-th transformer substation is carried out at any time, and reactive power of the b-th transformer substation is changed by throwing the target content reactor equipment, so that the optimization target of the s-th bus voltage to be monitored is realized.
11. The dynamic reactive power coordination control method for a new energy collection area based on power generation trend prediction according to claim 4, wherein if the power generation trend is in a peak stage or a valley stage and there is a new energy power plant unit with an adjusting capability, selecting and adjusting a target new energy power plant unit to realize an optimization target of bus voltage to be monitored, comprising:
if the power generation trend is in a peak stage or a valley stage and the new energy power plant unit has the adjusting capability, marking the new energy power plant unit which is in an operating state and has the adjusting capability as an optional new energy power plant unit according to the new energy power plant state subordinate to the b-th transformer substation;
determining corresponding voltage variation according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive adjustment quantity when the optional new energy power plant unit is put into a power grid;
Selecting a target new energy power plant unit according to the corresponding voltage variation when different selectable new energy power plant units are put into, and the current voltage sampling value and the voltage optimizing value of the s th bus to be monitored;
and changing the state of the target new energy power plant unit to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored.
12. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 11, wherein the changing the state of the target new energy power plant unit to change the voltage value of the s th bus to be monitored comprises:
when the new energy power plant unit has reactive power regulation capability, the new energy power plant unit is utilized to realize the substation bus voltage optimization target:
scanning the b-th substation subordinateThe running state of each new energy power plant unit is marked, the new energy power plant unit which is in the running state and has the adjusting capability is taken as an optional new energy power plant unit, and the serial number of the optional new energy power plant unit subordinate to the b-th transformer substation is set as ∈ ->，/>；/>Indicating the total number of optional new energy power plant units under the b-th transformer substation, when +.>When the method is used, available subordinate selectable new energy power plant units are described; the optional new energy power plant unit needs to meet the following requirements: / >And->；
Setting unit information of optional new energy power plant of b-th transformer substationThe following are provided:
；
wherein,indicating that the number of the optional new energy power plant units subordinate to the b-th transformer substation is not greater than the total number of the new energy power plant units;
according to the sensitivity of the new energy power plant unit to the busbar voltage of the transformer substation in the new energy collection areaThe relation between the voltage variation and the reactive power variation, when the voltage variation of the s th bus to be monitored isWhen the system is used, the total reactive power adjustment requirement of the power plant unit of the optional new energy corresponding to the b-th substation is +.>The method comprises the following steps:
；
counting total reactive power regulation capacity of power plant units of optional new energy of subordinate of b-th transformer substationExpressed as:；
checking total reactive power adjustment demandWhen->Is greater than the total reactive power regulation capability of the unit of the optional new energy power plantWhen the total reactive power regulation requirement exceeds the total reactive power regulation capability of the current new energy power plant unit, the total reactive power regulation requirement is corrected>；
According to the total reactive power regulation requirementAccording to reactive power balance principle of new energy power plant unit, total reactive power regulation requirement is added>Distributing the new energy power plant units to each new energy power plant unit; set the->The reactive power increment allocated to the new energy power plant unit is +.>The subscript of the new energy power plant unit is marked as +. >Obtaining the (b) th substation subordinate->Reactive target value of unit of new energy power plant +.>Expressed as: />；
Wherein,indicate->Reactive power increment of each new energy power plant unit;
generating control strategy information of new energy power plant unit subordinate to b-th transformer substationExpressed as:；
the control instruction of the reactive target value of the unit of the new energy power plant is issued to realize the first stepThe b-th transformer station belongs to a control strategy of a new energy power plant unit at the moment; the reactive power of the unit of the new energy power plant subordinate to the b-th transformer substation is changed to realize the b-th transformer substations busbar voltage optimization targets to be monitored.
13. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 4, wherein if the adjusting capacity of the target new energy power plant unit is exhausted, selecting and adjusting the target dynamic reactive power equipment to achieve the busbar voltage optimization target to be monitored comprises the following steps:
if the regulating capacity of the target new energy power plant unit is used up, marking the dynamic reactive equipment which is in an operating state and has regulating capacity as optional dynamic reactive equipment according to the state of the dynamic reactive equipment in the b-th transformer substation;
determining the corresponding s-th bus voltage variation to be monitored according to the reactive voltage sensitivity information, the relation between the voltage variation and the reactive adjustment quantity when different optional dynamic reactive equipment is put into a power grid;
Selecting target dynamic reactive power equipment according to the corresponding voltage variation when different selectable capacitive reactance equipment is put into operation, and the current voltage sampling value and the voltage optimizing value of the s-th bus to be monitored;
and changing the state of the target dynamic reactive power equipment to change the voltage value of the s bus to be monitored, so as to realize the voltage optimization target of the s bus to be monitored.
14. The new energy collection area dynamic reactive power coordination control method based on power generation trend prediction according to claim 13, wherein the changing the target dynamic reactive power equipment state to change the voltage value of the s th bus to be monitored comprises:
if the reactive power regulation capacity of the new energy power plant unit is exhausted, the reactive power of the dynamic reactive power equipment in the transformer substation is utilized to realize the transformer substation bus voltage optimization target:
scanning within a b-th substationThe running state of each dynamic reactive power equipment is marked as the dynamic reactive power equipment which is in the running state and has the adjusting capabilityOptional dynamic reactive power equipment, and setting the serial number of the optional dynamic reactive power equipment in the b-th transformer substation as，/>；/>Indicating the total number of optional dynamic reactive devices in the b-th substation whenWhen the method is used, the optional dynamic reactive equipment available in the b-th substation is described; the optional dynamic reactive power equipment needs to meet the following conditions: And->；
Setting optional dynamic reactive equipment information of b-th substationThe following are provided:；
wherein,indicating that the number of optional dynamic reactive devices in the b-th substation is not greater than the total number of dynamic reactive devices;
setting the firstThe initial goal of the reactive adjustment of the individual selectable dynamic reactive devices is reactive reserve setpoint +.>Reactive power adjustment amount->The method comprises the steps of carrying out a first treatment on the surface of the According to the sensitivity of dynamic reactive power equipment to the busbar voltage of the transformer substation in the new energy collection area +.>The relation between the voltage variation and the reactive variation is obtained +.>The corresponding transformer substation busbar voltage variation is>;
Setting the firstReactive setting target value of the individual selectable dynamic reactive device is +.>Initial defaultFor->And (3) checking the control strategy of each optional dynamic reactive power equipment:
according to the s-th busbar voltage variation to be monitoredIf at->The voltage of the s th bus to be monitored at the moment satisfies +.>Description of the->The control strategy of the individual optional dynamic reactive device checks through, marks +.>Subscript of the individual optional dynamic reactive device +.>；
First, theReactive target value of control strategy of each selectable dynamic reactive equipment: />；
Wherein,first->The reactive target value of each selectable dynamic reactive device is equal to the reactive reserve value;
according to the change of the bus voltage of the transformer substation If at->The voltage of the s th bus to be monitored at the moment meetsDescription of the->Control strategy verification requirements for individual selectable dynamic reactive devicesAdjustment, at this time->The reactive power targets of the individual selectable dynamic reactive power devices cannot be directly adjusted to reactive power reserve values by the following adjustment method:
according to the sensitivity of the dynamic reactive power equipment to the bus voltage of the transformer substationThe relation between the voltage variation and the reactive variation, when the voltage variation of the s th bus to be monitored is +.>Corresponding to->First reactive tuning quantity of an alternative dynamic reactive device +.>The method comprises the following steps: />
；
At this time, mark the firstSubscript of the individual optional dynamic reactive device +.>First->The reactive target values of the control strategies of the selectable dynamic reactive equipment are as follows: />；
Wherein,first->The reactive target value of each selectable dynamic reactive device is smaller than the reactive reserve value;
in the first placeTime of +.>The optional dynamic reactive equipment sequentially generates a control strategy, and the serial number of the optional dynamic reactive equipment passing verification in the b-th transformer substation is set as +.>，/>；/>Representing the total number of the optional dynamic reactive devices generating the control strategy in the transformer substation, and forming the control strategy information of the optional dynamic reactive devices in the b-th transformer substation>：
；
Wherein, ，/>Represents +.>Control instruction information of the selectable dynamic reactive equipment;
according to the firstDynamic optional reactive equipment control strategy information in time b-th substation>According to the principle that reactive load balance of main transformer in transformer substation and reactive output of dynamic reactive equipment are consistent, the transformer substation is self-controlled by ∈10>Selecting target dynamic reactive equipment from the selectable dynamic reactive equipment to control, and forming a final control instruction; set the->The target dynamic reactive equipment subscript in the b-th substation at the moment is +.>，/>Control instruction information for the target dynamic reactive equipment:；
wherein,representing a reactive target value of target dynamic reactive equipment in a b-th substation;
by issuing a control instruction of the target dynamic reactive equipment, the first step is realizedA control strategy for dynamic reactive equipment in the b-th transformer substation at any time; by changing the purposeAnd marking reactive power of dynamic reactive power equipment, and realizing the optimization target of the s-th bus voltage to be monitored. />
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| CN115764915A (en) * | 2022-11-21 | 2023-03-07 | 国网辽宁省电力有限公司沈阳供电公司 | Reactive power compensation clustering method and system considering voltage stability of station accessed by new energy |
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| JP2003169420A (en) * | 2001-11-29 | 2003-06-13 | Toshiba Corp | Voltage reactive power monitor/controller and program thereof |
| CN112636361A (en) * | 2020-12-18 | 2021-04-09 | 国家电网公司东北分部 | Alternating current-direct current hybrid power grid dynamic reactive power optimization control method based on voltage sensitivity |
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