CN114069698B - Self-adaptive multi-power generation unit controller and control method thereof - Google Patents

Self-adaptive multi-power generation unit controller and control method thereof Download PDF

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CN114069698B
CN114069698B CN202111356651.0A CN202111356651A CN114069698B CN 114069698 B CN114069698 B CN 114069698B CN 202111356651 A CN202111356651 A CN 202111356651A CN 114069698 B CN114069698 B CN 114069698B
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power
power generation
generation unit
grid
voltage
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CN114069698A (en
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杨金东
李芳方
刘红文
聂鼎
范黎涛
吴万军
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • 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
    • H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00028—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/14—District level solutions, i.e. local energy networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

Abstract

The application provides a self-adaptive multi-power generation unit controller and a control method thereof, wherein the method comprises the steps of monitoring power generated by a power generation unit in a preset time period and determining the working state of the power generation unit; under the grid-connected working state of the micro-grid, the power increase and decrease of the power generation unit when the micro-grid is in the off-grid working state is predicted according to the working state, the historical power generation power and the current power generation power of the power generation unit; calculating the average power of the power generation unit according to the historical power generation power; judging the order of stopping the power generation unit according to the average power and the power factor of the power generation unit; determining an increasing and decreasing value of the output power of the power generation unit according to the micro-grid off-grid control command and the increasing and decreasing power of the power generation unit; and determining the order of the power generation units put into operation according to the micro-grid-connected control command and the increasing and decreasing power of the power generation units. The self-adaptive multi-power-generation-unit controller can also identify and/or leave the network working instruction under the condition of communication interruption, control the power generation unit and ensure the running stability of the micro power grid.

Description

Self-adaptive multi-power generation unit controller and control method thereof
Technical Field
The application relates to the technical field of micro-grid operation control, in particular to a self-adaptive multi-generation unit controller and a control method thereof.
Background
With the rapid development of renewable energy power generation technology, energy storage technology and load control technology in recent years, a large number of power electronic devices such as distributed renewable energy power generation and the like are connected into a 400V low-voltage distribution network to form a renewable energy micro-grid system, and the micro-grid needs to have a dual-mode operation mode of parallel connection and off-grid in order to reduce loss caused by power failure and ensure the reliability of important load power supply.
In addition, with technological development and large-scale distributed power access to the 400V low-voltage power distribution network, the trend of the 400V low-voltage power distribution network changes, and the structure of the power generation unit tends to be complicated.
In the grid-connected mode, the micro-grid voltage and the frequency can be basically kept stable due to the clamping effect of the main grid, so that the stable operation of the power generation unit is ensured. When the micro-grid operates in the off-grid mode, the micro-grid is separated from the main grid to supply power, and the quality of the micro-grid is reduced due to the fact that the capacity of the micro-grid is limited and the output power of the original power generation unit is adopted. Because the micro-grid is in an environment without the communication condition of the upper dispatching, the parallel and off-grid state of the micro-grid is rapidly identified, the reliability of the micro-grid is easily reduced, and the stability of the micro-grid cannot be ensured.
Disclosure of Invention
The application provides a self-adaptive multi-power generation unit controller and a control method thereof, which are used for solving the problem that the stability of a micro-grid cannot be ensured because the environment where the micro-grid is located does not have the communication condition with the superior dispatching.
Because the environment in which the self-adaptive multi-load response controller is installed does not have the condition of communication with the upper level, the self-adaptive multi-power generation unit controller is utilized to identify the off-grid state of the micro-grid by detecting the voltage change rate threshold and the frequency change threshold of the micro-grid, and corresponding control strategies are correspondingly executed.
In one aspect, the present application provides a control method of an adaptive multiple power generation unit controller, including the following steps:
s101, monitoring the power generated by a power generation unit in a preset time period, determining the working state of the power generation unit, and initializing a preset micro-grid-connected voltage change rate threshold value and a micro-grid off-grid voltage change rate threshold value; the preset time period is set according to sampling precision, the preset time periods corresponding to different sampling precision are different, and the generated power in the preset time period comprises historical generated power and current generated power;
s102, under the grid-connected working state of the micro-grid, according to the working state, the historical power and the current power of the power generation unit, predicting and analyzing the increase and decrease power of the power generation unit when the micro-grid is off-grid;
S103, identifying off-grid or grid-connected states according to the off-grid voltage change rate threshold value or the grid-connected voltage change rate threshold value of the micro grid; comprising the following steps:
the self-adaptive multiple power generation unit controller collects power generation power of all power generation units in real time and monitors voltage change rate of the micro-gridAccording to the grid-connected or off-grid state of the micro-grid at the previous moment, passing through the grid-connected voltage change rate threshold lambda of the micro-grid at the current moment on And an off-grid voltage rate of change threshold lambda off Identifying the grid-connected or off-grid state of the current micro-grid, and executing grid-connected or off-grid switching by the self-adaptive multi-power generation unit controller according to the voltage change rate threshold;
wherein DeltaU w The outlet voltage variation of the power generation unit is represented, and the voltage variation of the micro-grid can be directly reflected; lambda (lambda) off A micro-grid off-grid voltage change rate threshold; lambda (lambda) on A grid-connected voltage change rate threshold value of the micro-grid;representing the voltage change rate of the micro-grid, and T represents the sampling period;
s104, calculating average power of the power generation unit according to the historical power generation power, judging the order in which the power generation unit stops working according to the average power and the power factor of the power generation unit, and implementing a power generation unit control strategy according to the increase and decrease of the frequency change;
s105, after off-grid triggering according to the off-grid voltage change rate threshold of the micro-grid, the power generation unit determines an increase and decrease value of the output power of the power generation unit according to the outlet voltage; comprising the following steps:
S1050, when the self-adaptive multi-generation-unit controller monitors the voltage change rate of the micro gridWhen the self-adaptive multiple power generation unit controller determines the increasing and decreasing values of the output power of the power generation unit according to the increasing and decreasing power of the power generation unit, wherein DeltaU w Represents the variation of the outlet voltage of the power generation unit lambda off A micro-grid off-grid voltage change rate threshold; />Representing the voltage change rate of the micro-grid, and T represents the sampling period;
s1051, when the adaptive multi-power-generation-unit controller is closed to a specific power generation unit, the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
s1052, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≤δU ugb When the micro-grid is in a power-on state, the power generation unit maintains or tracks the current voltage output power of the micro-grid;
s1053, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
s1054, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≤δU ugb When the power generation unit maintains or tracks the current voltage output power of the micro-grid, wherein U ac Representation ofOutlet voltage of the power generation unit, delta represents voltage fluctuation coefficient range, U ugb Representing an upper voltage limit criterion;
s106, after grid-connected voltage change rate threshold value of the micro-grid is triggered off-grid, determining an output power increasing and decreasing value and a sequence of operation of the power generation unit according to the outlet voltage of the power generation unit; comprising the following steps:
s1060, when the self-adaptive multi-generation-unit controller monitors the voltage change rate of the micro gridWhen the self-adaptive multiple power generation unit controller sequentially puts the power generation units into operation according to the power generation power from large to small, wherein DeltaU w Represents the variation of the outlet voltage of the power generation unit lambda on A grid-connected voltage change rate threshold value of the micro-grid; />The voltage change rate of the micro-grid in one sampling period time is represented, and T represents the sampling period;
s1061, the controller module in the self-adaptive multi-generation unit controller monitors the outlet voltage U of the generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
s1062, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≥δU lgb When the micro-grid is in a power-on state, the power generation unit maintains or tracks the current voltage output power of the micro-grid;
s1063, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
s1064, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≥δU lgb When the power generation unit maintains or tracks the current voltage output power of the micro-grid, wherein U ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficientRange, U lgb Representing the voltage lower limit criteria.
In a preferred embodiment of the present application, when grid-connected, predicting the off-grid moment for each power generation unit to distribute output power includes:
when the micro-grid is in a grid-connected working state, a controller module in the self-adaptive multi-generation unit controller performs working power and state pre-analysis on the generation unit according to the generation power at the current moment and the historical generation power;
according to the historical synchronous power and voltage curve, analyzing the voltage change coefficient of the unit power in different preset time periodsAnd dividing each hour into 4 preset time periods at 15 minutes, and initially setting a voltage change coefficient of unit generated power in each preset time period +.>Iteration of self-learning with increasing data volume to obtain new optimal voltage variation coefficient of unit generated power ∈ ->
Simultaneously, respectively finding out the maximum value p of the historical synchronous power generation power by taking 15 minutes as a preset time period max ＝max(p t1 ,p t2 …p t15 ) Sum voltage minimum U min ＝min(u t1 ,u t2 …u t15 ) U with highest voltage max ＝max(u t1 ,u t2 …u t15 ) The former describes the maximum currentThe latter illustrates that the current is at a minimum +.>The current is the internet current under the condition of minimum load;
when the system is in grid-connected state and normally operates, the controller moduleThe output currents of all the generating units at the current moment are read and summed to obtain a sum current Sigma i i ；
When i min ≤∑i i ≤i max The sum current sigma i will then be i Subtracting the on-line current to obtain the total output current i of all the power generation units at the off-line moment of the micro-grid f ＝∑i i -i min Thereby outputting a current and a summation current Sigma i through the generating unit at the off-grid moment of the micro-grid i Obtaining the output current coefficient of each power generation unit at off-grid time,
whereby the output current coefficient i at off-grid time through each power generation unit fi Calculating the product of the current output current of each power generation unit to obtain the distribution output current of each power generation unit at the future off-grid moment, wherein the calculation formula is i '' 1 ＝i fi ×i 1 ；i’ 2 ＝i fi ×i 2 ；......i’ n ＝i fi ×i n ；
Wherein i' 1 Distributing output current to the power generation unit 1; i' 2 Distributing output current to the power generation unit 2; i' n Distributing output current for the power generation unit n; i.e fi The output current coefficient of each power generation unit at off-grid time is calculated; i.e f And (5) outputting the total current of all the power generation units at the off-grid moment of the micro-grid.
In a preferred embodiment of the present application, selecting an optimal power generation unit combined output power includes:
Screening output efficiency of power generation unit by using screening functionAnd power generation unit output efficiencyOutput efficiency +.>The power generation unit of (1) reduces output current and improves output efficiency +.>The output current of the power generation unit ensures the output efficiency of the power generation unit of the output current to be +>
Setting current data to be screened as data in]Screening target value is i f ＝∑i i -i min Intermediate results of the screening procedure were tmpres [ i ]]The screening function is processDate (idx, sum); and then, taking the highest power generation efficiency of the power generation unit and the lowest line loss as constraint conditions, selecting the optimal combined output power of the power generation unit to obtain an optimal combined selection function as follows:
wherein the objective function is the output current i of the selected power generation unit f ＝∑i i -i min Constraint s.t. is minimum energy lossCorresponding power wave bands with highest power generation efficiency of the power generation unit are defaulted that the inverter works at 60% -80% of rated power P N,i The calculation formula is->
Establishing a protocol code for closing or reducing power output corresponding to the power generation unit, and when the micro-grid runs off-grid, the controller module sends the protocol code for reducing power to the power generation unit through the multi-interface multi-protocol communication module according to the analysis result;
in the above formula, β is a voltage change coefficient of the generated power per unit of different preset time periods, and Δu represents a voltage change value corresponding to the preset time period kW represents unit generation power; u (u) t1 A 1 st minute voltage that is a 15 th minute period of historical synchronization; u (u) t2 2 nd minute voltage for 15 th minute period of history synchronization; u (u) t15 15 th minute voltage, which is a 15 th minute period of historical synchronization; p is p t1 1 st minute power for 15 minute period of history synchronization; p is p t2 2 nd minute power for 15 th minute period of history synchronization; p is p t15 15 th minute power for 15 th minute period of historical synchronization; i.e max Maximum current in 15 minutes period for historical synchronization; p is p max Maximum power within 15 minutes of the history synchronization; u (U) min Minimum voltage within 15 minutes period for the contemporaneous history; u (U) max Maximum voltage within 15 minutes period for historical synchronization; i.e min Minimum current within 15 minutes of history synchronization; i.e fi The ratio of the output current of the power generation unit to the summation current of the power generation unit at the current moment; i.e f For the total output current of all the power generation units at off-grid time, P N,i Which represents the rated power of the electric motor,to minimize the loss of energy, Σi i Representing the summed current.
In a preferred embodiment of the present application, identifying an off-grid or on-grid state according to a micro-grid off-grid voltage change rate threshold includes:
the self-adaptive multiple power generation unit controller collects power generation power of all power generation units in real time and monitors voltage change rate of the micro-gridAccording to the grid-connected or off-grid state of the micro-grid at the previous moment, passing through the grid-connected voltage change rate threshold lambda of the micro-grid at the current moment on And an off-grid voltage rate of change threshold lambda off Identifying the grid-connected or off-grid state of the current micro-grid, and executing grid-connected or off-grid switching by the self-adaptive multi-power generation unit controller according to the voltage change rate threshold;
judging the influence on the voltage of the micro-grid according to the change of the power generated by the multiple power generation units, and collecting the outlet voltage U of the power generation unit controller at the previous moment t0-1 Control of power generation unit at current momentVoltage U of the controller t0 The current power generation unit change power Δp subtracted from the absolute value of the difference n The difference of the beta product of the voltage change coefficient of the unit power generation is calculated as delta U w ＝|U t0-1 -U t0 |-β·ΔP n Wherein U is t0-1 Collecting the outlet voltage of the power generation unit for the previous moment; u (U) t0 Collecting the outlet voltage of the power generation unit for the current moment; beta is the voltage change coefficient of the unit power generation, and the calculation formula isΔu is the voltage change of the micro-grid caused by the power change of the multiple power generation units; ΔP n Output power Sigma P of all power generation units acquired at the previous moment i_t0 And the output power difference Sigma P of all the power generation units acquired at the current moment i_t0-1 Is calculated as delta P n ＝|∑P i_t0 -∑P i_t0-1 |。
In a preferred embodiment of the present application, determining the order in which the power generation units are stopped according to the average power and the power factor of the power generation units includes:
When the power factor alpha is more than or equal to 0.9 and less than or equal to 1, controlling the power generation units to stop working in sequence from large to small;
when the power factor alpha is less than or equal to 0.9, the power generation unit is controlled to maintain the current working state, wherein alpha represents the power factor.
In a preferred embodiment of the present application, the determining the order in which the power generation units stop operating according to the average power and the power factor of the power generation units further includes:
calculating historical power generation power at each moment in a preset time period;
averaging the historical power generation power at all times in a preset time period to obtain the average power of the residual power generation units in the preset time period;
summing the average power of the rest power generation units to obtain summed average power;
comparing the summed average power to a target stall power;
if the target power is not smaller than the sum average power of the rest power generation units, all the rest power generation units are stopped;
if the target power is smaller than the sum average power, introducing a sort function to construct a descending order expression G from large to small of the sum average power of each of the target power and the rest power generation units 2 Descending order of functional expression G 2 The following are provided:
G 2 ＝sort(processDate(p ave1 ,p ave2 ,p 2 ……p aven ,p State ,n),'descend')；
G 2 for this purpose, the target power and the sum average power of the remaining power generation units are arranged from large to small according to the sequential function G 2 The order of stopping the power generation unit is adjusted in real time; wherein p is ave1 Representing the summed average power, p, of the remaining first power generation units ave2 Representing the summed average power, p, of the second power generation unit aven Representing the summed average power, p, of the remaining nth power generating units 2 Indicating target stop power, p State Indicating the working state of the power generation units, wherein n indicates the number of the residual power generation units, and sort is a ranking function at a certain moment; the processDate is a function for screening out the non-online load equipment, the PSnState is the load equipment state, the equipment is online when psnstate=1, and the equipment is not online when psnstate=0; 'desend' is denoted as a descending order.
In a preferred embodiment of the present application, the adaptive multiple power generation unit controller may further adaptively determine an increase and decrease value of the output power of the power generation unit or a calculation of the shutdown power of the power generation unit according to the frequency of the micro grid, including:
wherein f 0 Is 50Hz of standard frequency; Δf is the absolute value of the difference between the frequency of the micro-grid at the off-grid time and the frequency of the micro-grid at the previous time; p is p 1 The power of the power generation unit which is stopped at present; p is p 2 Is the object ofStopping the power;
calculating the difference value between the adjacent power generation units with smaller than and larger than the power stop power after sequencing the sequential functions;
If Δp 2u ＜Δp 2l Average power p is taken maxu A power generation unit for stopping power generation;
if Δp 2u ≥Δp 2l Average power p is taken maxl A power generation unit for stopping power generation;
wherein Δp 2l For ordered less than target stall power p 2 Adjacent power generation unit and target power p 2 Is a difference in (2); Δp 2u For ordered greater than target power p 2 Adjacent power generation unit and target power p 2 Is a difference in (2); i is any integer of 1,2 … … n, where n is a natural number; p is p maxu For ordered greater than target power p 2 Adjacent power generation units, p maxl For ordered less than target stall power p 2 Adjacent power generation units.
In a preferred embodiment of the present application, the adaptive multiple power generation unit controller is based on a micro-grid voltage rate of change threshold lambda off Triggering off-grid, executing a control strategy related to off-grid, closing a specific power generation unit or reducing the output power of the power generation unit, and when a controller module in the self-adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating the increment and decrement of the distributed output power of each power generation unit when the output voltage U of the power generation unit is ac ≤δ·U lgb And calculating the power released by each power generation unit.
Further, in the preferred embodiment of the present application, (1) when the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb At this time, the outlet voltage U of the power generation unit is calculated ac Subtracting the voltage fluctuation coefficientUpper voltage limit standard U and range delta ugb Is multiplied by (a) to obtain the excess voltage DeltaU ac ＝U ac -δ·U ugb The controller module calculates a formula for reducing the output power of the power generation unit according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power, wherein the formula is as followsThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtained>Calculating the product of the power distribution coefficient of each power generation unit and the output power of each power generation unit to obtain the distribution actual output power P 'of each power generation unit' 1 ＝P fi ×P 1 ；P’ 2 ＝P fi ×P 2 ；……P’ n ＝P fi ×P n ；
The self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units, and the power output protocol codes are sent out by the multi-interface multi-protocol communication module to control the corresponding power generation units to reduce the power output power;
When the controller module in the adaptive multi-power-generation-unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≤δU ugb When each power generation unit maintains or tracks the current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb The voltage upper limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn The output power of the power generation unit is required to be reduced; p (P) 1 ' distributing the output power for the power generation unit 1; p'. 2 Distributing output power to the power generation unit 2; p'. n Distributing output power for the power generation unit n; p (P) fi Distributing coefficients for the power of the power generation unit; p (P) f The total actual output power of the power generation unit;
(2) when the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac Fluctuation is less than or equal to voltage fluctuation coefficient range delta and voltage lower limit standard U lgb Product of (i.e. U) ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates the output power of the power generation unit to be increased according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power to be increased to beThe self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn The power generation unit is controlled to release the power of the power generation unit from large to small, and when a controller module in the self-adaptive multi-power generation unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≥δU lgb When each power generation unit maintains or tracks the current voltage output power of the microgrid.
In a preferred embodiment of the present application, the adaptive multiple power generation unit controller is based on a micro-grid voltage rate of change threshold lambda on Triggering grid connection, executing a grid connection related strategy, and monitoring the outlet voltage U of the power generation unit when a controller module in the self-adaptive multi-power generation unit controller ac ≥δ·U ugb At the time, the increment and decrement of the distributed output power of each power generation unit and the outlet voltage U of the power generation unit are calculated ac ≤δ·U lgb And calculating the released power output power of each power generation unit.
Further, in the preferred embodiment of the present application, (1) when the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
When the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb When the excess voltage delta U of the power generation unit is calculated ac ＝U ac -δ·U ugb The controller module calculates the output power of the power generation unit to be reduced according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation powerThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtainedThe product calculation of the power distribution coefficient of each power generation unit and the output power of each power generation unit is adopted to obtain the distribution actual output power P of each power generation unit 1 '＝P fi ×P 1 ；P 2 '＝P fi ×P 2 ；……P’ n ＝P fi ×P n The method comprises the steps of carrying out a first treatment on the surface of the The self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units; the multi-interface multi-protocol communication module is used for sending out and controlling the corresponding power generation unit to reduce the power generation output power;
when the controller module in the adaptive multi-power-generation-unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≤δU ugb Each generating unit maintains or generates electricity whenTracking the current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb The voltage upper limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn The output power of the power generation unit is required to be reduced; p (P) 1 ' distributing the output power for the power generation unit 1; p (P) 2 ' distributing the output power for the power generation unit 2; p (P) n ' distributing output power for the power generation unit n; p (P) fi Distributing coefficients for the power of the power generation unit; p (P) f The total actual output power of the power generation unit;
(2) when the outlet voltage U ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates the output power of the power generation unit to be increased according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power to be increased to be The self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn The power generation unit is controlled to release the power of the power generation unit from large to small, and when a controller module in the self-adaptive multi-power generation unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≥δU lgb When each power generation unit maintains or tracks the current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U lgb Represents the voltage lower limit standard, beta is the history synchronous unit generationThe electric power voltage increase coefficient, deltaU is the historical synchronous unit generated power voltage increase value, deltaU ac To exceed the voltage, p fn Indicating that the output power of the power generation unit needs to be increased.
In another aspect, the present application also provides an adaptive multi-power generation unit controller, comprising: the device comprises a controller module, a multi-interface multi-protocol communication module, a short circuit monitoring module, a voltage sensor, a current sensor, a contactor driving module and a contactor;
the input end of the contactor is connected with the micro-grid, the micro-grid is connected with the voltage sensor, the output end of the contactor is connected with the power generation unit through the current sensor, and the control end of the contactor is connected with the output end of the contactor driving module; the input end of the contactor driving module is connected with the output end of the controller module; the output end of the current sensor is connected with the input end of the short circuit monitoring module; the output end of the short circuit monitoring module is connected with the input end of the controller module, and the short circuit monitoring module is used for monitoring a short circuit state; the communication interface of the multi-interface multi-protocol communication module is connected with the communication interface of the power generation unit through a communication line, the output end of the multi-interface multi-protocol communication module is connected with the controller module, and the controller module reads the data information of the power generation unit in real time;
The contactor driving module is provided with n locking control ends, is in communication connection with the contactor driving module through a short circuit monitoring module, and controls the locking control ends corresponding to the contactor driving module to be connected and disconnected according to the short circuit state of the power generation unit acquired by the controller module;
the controller module is used for receiving current data acquired by the current sensor, voltage data acquired by the voltage sensor and a short-circuit state of the power generation unit, judging an off-grid state of the micro-grid through a voltage change rate threshold value in unit time, and controlling the on-off of the contactor through the contactor driving module.
According to the technical scheme, when a certain power generation device fails to short circuit, the short circuit monitoring module can rapidly disconnect the power generation device from the micro-grid and lock the failure state; when the short circuit monitoring module detects that the fault is removed, the corresponding locking control end of the short circuit monitoring module is changed into a release state.
Compared with the prior art, the self-adaptive multi-power generation unit controller and the control method thereof have the following beneficial effects:
the self-adaptive multi-power-generation-unit controller can lead to rapid voltage change, steep increase of voltage change rate and change of frequency when parallel/off-grid occurs through the micro grid, so that the parallel/off-grid state of the micro grid is identified by utilizing the voltage change rate and the frequency change, corresponding control strategies are executed according to the self-adaptive multi-power-generation-unit controller in different states, impact of a distributed power generation system on the micro grid is reduced, stability of the quality of the micro grid is guaranteed, and safe and stable operation of a power generation unit in the micro grid is further guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a flowchart of a control method of an adaptive multi-power generation unit controller according to embodiment 1 of the present application;
FIG. 2 is a schematic diagram of the topology of an adaptive multi-generator unit controller according to embodiment 2 of the present application;
fig. 3 is a schematic diagram of a micro-grid topology after the adaptive multi-generator unit controller according to embodiment 2 of the present application is applied;
fig. 4 is a control flow chart of the adaptive multi-power generation unit controller in the off-grid state of the micro grid in embodiment 1 of the present application;
fig. 5 is a control flow chart of the adaptive multi-power generation unit controller in the micro grid connected state in embodiment 1 of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, the directions or positional relationships indicated by the terms "upper", "middle", "lower", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "connected" are to be construed broadly, and may be, for example, electrical connections or communication connections. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated (Unless otherwise indicated). It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such product or apparatus.
The term "module" as used in this application refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the function associated with that element.
Micro-grid: the system is a small power generation and distribution system which consists of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like. The micro-grid is an autonomous system capable of realizing self-control, protection and management, and can be operated in grid-connected and off-grid states.
In order to ensure reliable identification of the state of the micro-grid, the patent adopts two modes to identify the grid-connected state and the off-grid state, and the priority triggering identification condition is the voltage change rate of the micro-grid
1. Micro-grid voltage rate of changeTrigger recognition condition
(1) Voltage change rate threshold lambda when connected through micro-grid on Judging and identifying the off-grid state;
(2) voltage change rate threshold lambda when off-grid through micro-grid off Judging and identifying a grid-connected state;
2. micro-grid frequency f change triggering identification condition
(1) Off-grid switching frequency threshold f during grid connection through micro-grid β Judging and identifying the off-grid state.
Example 1
As shown in fig. 1, the present application provides a control method of an adaptive multi-power generation unit controller, including the following steps:
s101, monitoring the power generated by a power generation unit in a preset time period, determining the working state of the power generation unit, and initializing a preset micro-grid-connected voltage change rate threshold value and a micro-grid off-grid voltage change rate threshold value; the preset time period is set according to sampling precision, the preset time periods corresponding to different sampling precision are different, and the generated power in the preset time period comprises historical generated power and current generated power;
s102, under the grid-connected working state of the micro-grid, according to the working state, the historical power and the current power of the power generation unit, predicting and analyzing the increase and decrease power of the power generation unit when the micro-grid is off-grid;
S103, identifying off-grid or grid-connected states according to the off-grid voltage change rate threshold value or the grid-connected voltage change rate threshold value of the micro grid; comprising the following steps:
the self-adaptive multiple power generation unit controller collects power generation power of all power generation units in real time and monitors voltage change rate of the micro-gridAccording to the grid-connected or off-grid state of the micro-grid at the previous moment, passing through the grid-connected voltage change rate threshold lambda of the micro-grid at the current moment on And an off-grid voltage rate of change threshold lambda off Identifying the grid-connected or off-grid state of the current micro-grid, and executing grid-connected or off-grid switching by the self-adaptive multi-power generation unit controller according to the voltage change rate threshold;
s104, calculating average power of the power generation unit according to the historical power generation power, judging the order in which the power generation unit stops working according to the average power and the power factor of the power generation unit, and implementing a power generation unit control strategy according to the increase and decrease of the frequency change;
s105, after off-grid triggering according to the off-grid voltage change rate threshold of the micro-grid, the power generation unit determines an increase and decrease value of the output power of the power generation unit according to the outlet voltage;
and S106, determining the order of the power generation units put into operation according to the micro-grid-connected voltage change rate threshold and the increasing and decreasing power of the power generation units.
In embodiment 1, before executing step S101, initialization settings including the micro grid-connected voltage change rate threshold λ are required on And a micro-grid off-grid voltage change rate threshold lambda off The type of power generation equipment (photovoltaic: string, grid-connected, capacity, number and distance from grid-connected point; wind power: single-machine capacity, number), and loss parameters of each line. In addition, in step S101, the generated power, the grid frequency and the power factor of each power generation unit are respectively monitored in real time by using a current sensor and a voltage sensor.
Further, in the present embodiment 1, step S102 specifically includes:
in order to prevent sudden change of voltage of the micro-grid caused by incapability of outward transmission of power output due to simultaneous power generation of all power generation units at off-grid time, when the micro-grid is in a grid-connected working state, a controller module in a self-adaptive multi-power generation unit controller performs pre-analysis on working power and state of the power generation units according to the current time generation power and the historical generation power, and analyzes voltage change coefficients of power generation power in different preset time units according to historical synchronous generation power and voltage curves in order to avoid abrupt change of the micro-grid during off-grid processAnd dividing each hour into 4 preset time periods at 15 minutes, and initially setting a voltage change coefficient of unit generated power in each preset time period +. >Iteration of self-learning with increasing data volume to obtain new optimal voltage variation coefficient of unit generated power ∈ ->
Simultaneously, respectively finding out the maximum value of the historical synchronous power generation power by taking 15 minutes as a preset time periodp max ＝max(p t1 ,p t2 …p t15 ) Sum voltage minimum U min ＝min(u t1 ,u t2 …u t15 ) U with highest voltage max ＝max(u t1 ,u t2 …u t15 ) The former describes the maximum currentThe latter illustrates that the current is at a minimum +.>This current is the internet current at minimum load.
When the system is in grid-connected state and normally operates, the controller module reads the output currents of all the generating units at the current moment and sums the output currents to obtain a sum current Sigma i i When i min ≤∑i i ≤i max The sum current sigma i will then be i Subtracting the on-line current to obtain the total output current i of all the power generation units at the off-line moment of the micro-grid f ＝∑i i -i min The load absorbs current at off-grid time, and thus the current and the summation current Sigma i are output by the power generation unit at off-grid time of the micro-grid i Obtaining the output current coefficient of each power generation unit at off-grid time,whereby the output current coefficient i at off-grid time through each power generation unit fi Calculating the product of the current output current of each power generation unit to obtain the distribution output current of each power generation unit at the future off-grid moment, namely i 1 '＝i fi ×i 1 ；i' 2 ＝i fi ×i 2 ；……i' n ＝i fi ×i n 。
Wherein i is 1 ' distributing the output current for the power generation unit 1; i' 2 Distributing output current to the power generation unit 2; i' n Distributing output current for the power generation unit n; i.e fi The output current coefficient of each power generation unit at off-grid time is calculated; i.e f For all power generation units at off-grid time of micro-gridAnd outputting the current.
Based on initializing line loss parameters, consider line loss minimizationAnd the output efficiency range of each power generation unit at this time +.>Screening the output efficiency of the power generating unit by means of a screening function>And generating unit output efficiency->Output efficiency +.>The power generation unit of the power generation system reduces output current and improves output efficiencyThe output current of the power generation unit ensures the output efficiency of the power generation unit of the output current to be +>
Thereby setting the current data to be screened as data in]Screening target value is i f ＝∑i i -i min . Intermediate results of the screening procedure were tmpres [ i ]]. The screening function is processDate (idx, sum); then, the optimal combination is selected to act by taking the highest power generation efficiency and the lowest line loss of the power generation unit as constraint conditions, namely the lowest energy loss, so that the optimal combination selection function is obtained as follows:
wherein the objective function is the output current i of the selected power generation unit f ＝∑i i -i m i n Constraint s.t. isMinimum energy lossCorresponding power wave bands with highest power generation efficiency of the power generation unit are defaulted that the inverter works at 60% -80% of rated power P N,i Lower, i.e.)>
The method comprises the steps that a protocol code of a power generation unit corresponding to power output is built, and when a micro-grid runs off-grid, a controller module sends out the protocol code of power reduction to the power generation unit through a multi-interface multi-protocol communication module according to an analysis result;
in the formula, beta is a voltage change coefficient of unit power generation power in different preset time periods, deltaU represents a voltage change value in the corresponding preset time period, and kW represents the unit power generation power; u (u) t1 A 1 st minute voltage that is a 15 th minute period of historical synchronization; u (u) t2 2 nd minute voltage for 15 th minute period of history synchronization; u (u) t15 15 th minute voltage, which is a 15 th minute period of historical synchronization; p is p t1 1 st minute power for 15 minute period of history synchronization; p is p t 2 is the 2 nd minute power of the 15 th minute period of the history synchronization; p is p t15 15 th minute power for 15 th minute period of historical synchronization; i.e max Maximum current in 15 minutes period for historical synchronization; p is p max Maximum power within 15 minutes of the history synchronization; u (U) min Minimum voltage within 15 minutes period for the contemporaneous history; u (U) max Maximum voltage within 15 minutes period for historical synchronization; i.e min Minimum current within 15 minutes of history synchronization; i.e fi The ratio of the output current of the power generation unit to the summation current of the power generation unit at the current moment; i.e f For the total output current of all the power generation units at off-grid time, P N,i Which represents the rated power of the electric motor,to minimize the loss of energy, Σi i Representing the summed current.
Further, in the present embodiment 1, step S103 specifically includes:
identifying off-grid or on-grid conditions according to the micro-grid off-grid voltage change rate threshold, comprising:
the self-adaptive multiple power generation unit controller collects power generation power of all power generation units in real time and monitors voltage change rate of the micro-gridAccording to the grid-connected or off-grid state of the micro-grid at the previous moment, passing through the grid-connected voltage change rate threshold lambda of the micro-grid at the current moment on And an off-grid voltage rate of change threshold lambda off Identifying the grid-connected or off-grid state of the current micro-grid, and executing grid-connected or off-grid switching by the self-adaptive multi-power generation unit controller according to the voltage change rate threshold;
judging the influence on the voltage of the micro-grid according to the change of the power generated by the multiple power generation units, and collecting the outlet voltage U of the power generation unit controller at the previous moment t0-1 Voltage U of power generation unit controller at current moment t0 The current power generation unit change power Δp subtracted from the absolute value of the difference n The difference of the beta product of the voltage change coefficient of the unit power generation is calculated as delta U w ＝|U t0-1 -U t0 |-β·ΔP n Wherein U is t0-1 Collecting the outlet voltage of the power generation unit for the previous moment; u (U) t0 Collecting the outlet voltage of the power generation unit for the current moment; beta is the voltage change coefficient of the unit power generation, and the calculation formula isΔu is the voltage change of the micro-grid caused by the power change of the multiple power generation units; ΔP n Output power Sigma P of all power generation units acquired at the previous moment i_t0 And the output power difference Sigma P of all the power generation units acquired at the current moment i_t0-1 Is calculated as delta P n ＝|∑P i_t0 -∑P i_t0-1 |。
Further, in the present embodiment 1, step S104 specifically includes:
the self-adaptive multi-power generation unit controller reads 10 samples before the current moment by taking 1 acquisition period as a unitThe historical power of each power generation unit in each collection period is p t1 ,p t2 …p t10 And average the power of the historical power generation unit to obtainThe average power of the n power generation units is defined as: p is p ave1 ,p ave2 ……p aven ，
And by sequential function: sort (processDate (p) ave1 ,p ave2 ……p aven ,p State N), and 'descend') sequentially screens out the average power of n power generation units from large to small, wherein the average power is as follows: p is p max1 ,p max2 ……p maxn ；
Wherein p is ave1 Average power of the power generation unit in a preset time period for the 1 st power generation unit, p ave2 Average power of the power generation unit in a preset time period for the 2 nd power generation unit, p aven For the average power of the power generation units in a certain easy preset time period of the nth power generation unit, the sort function of the source is a certain preset time period, the processDate is the function of screening the power generation units in an online state, and p State In the state of the power generation units, n is the number of the power generation units, n is more than or equal to 1 and is an integer;
screening p in the same preset time period (10 acquisition periods) max1 For maximum power generation unit power, p max2 For the next largest generating unit power, p maxn Is the minimum power generation unit power.
Further, in the present embodiment 1, step S104 specifically includes:
when the power factor alpha is more than or equal to 0.9 and less than or equal to 1, the self-adaptive multi-power-generation-unit controller controls the power generation units to stop working sequentially from large to small, namely controlling the power generation units to operate at p in the step S103 max1 ,p max2 ……p maxn Sequentially stopping working;
when the power factor alpha is less than or equal to 0.9, the self-adaptive multi-power-generation-unit controller controls all power generation units to maintain the current working state, wherein alpha represents the power factor.
Still further, step S104 further includes:
calculating historical power generation power at each moment in a preset time period;
averaging the historical power generation power at all times in a preset time period to obtain the average power of the residual power generation units in the preset time period;
summing the average power of the rest power generation units to obtain summed average power;
comparing the summed average power to a target stall power;
if the target power is not smaller than the sum average power of the rest power generation units, all the rest power generation units are stopped;
If the target power is smaller than the sum average power, introducing a sort function to construct a descending order expression G from large to small of the sum average power of each of the target power and the rest power generation units 2 Descending order of functional expression G 2 The following are provided:
G 2 ＝sort(processDate(p ave1 ,p ave2 ,p 2 ……p aven ,p State ,n),'descend')；
G 2 for this purpose, the target power and the sum average power of the remaining power generation units are arranged from large to small according to the sequential function G 2 The order of stopping the power generation unit is adjusted in real time; the method comprises the steps of carrying out a first treatment on the surface of the
Wherein p is ave 1 represents the sum average power of the remaining first power generation units, p ave 2 represents the sum average power of the second power generation unit, p aven Representing the summed average power, p, of the remaining nth power generating units 2 Indicating target stop power, p State Indicating the working state of the power generation units, wherein n indicates the number of the residual power generation units, and sort is a ranking function at a certain moment; the processDate is a function for screening out the non-online load equipment, the PSnState is the load equipment state, the equipment is online when psnstate=1, and the equipment is not online when psnstate=0; 'desend' is denoted as a descending order.
Adaptive multiple power generation unit controlThe voltage change rate threshold lambda of the micro-grid off Triggering off-grid, executing a control strategy related to off-grid, closing a specific power generation unit or reducing the output power of the power generation unit, and when a controller module in the self-adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating the increment and decrement of the distributed output power of each power generation unit when the output voltage U of the power generation unit is ac ≤δ·U lgb And calculating the power released by each power generation unit.
Further, in the present embodiment 1, as shown in fig. 4, step S105 specifically includes:
s1050, when the self-adaptive multi-generation-unit controller monitors the voltage change rate of the micro gridWhen the self-adaptive multiple power generation unit controller determines the increasing and decreasing values of the output power of the power generation unit according to the increasing and decreasing power of the power generation unit, wherein DeltaU w Represents the variation of the outlet voltage of the power generation unit lambda off A micro-grid off-grid voltage change rate threshold; />Representing the voltage change rate of the micro-grid, and T represents the sampling period; />
S1051, when the adaptive multi-power-generation-unit controller is closed to a specific power generation unit, the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit; further, the calculation steps are as follows:
When the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac Voltage fluctuation coefficient range delta and voltage upper limit standard U ugb Product of (i.e. U) ac ≥δ·U ugb At this time, the outlet voltage U of the power generation unit is calculated ac Subtracting the voltage fluctuation coefficient range delta and the voltage upper limit standard U ugb Is multiplied by (2) to obtain the excess voltageΔU ac ＝U ac -δ·U ugb The controller module calculates a formula for reducing the output power of the power generation unit according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power, wherein the formula is as followsThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtained>Thereby obtaining the actual output power distributed by each generating unit through the product calculation of the power distribution coefficient of the generating unit and the output power of each generating unit, namely P 1 '＝P fi ×P 1 ；P 2 '＝P fi ×P 2 ；……P’ n ＝P fi ×P n Wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb The voltage upper limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn The output power of the power generation unit is required to be reduced; p'. 1 Distributing output power to the power generation unit 1; p'. 2 Distributing output power to the power generation unit 2; p'. n Distributing output power for the power generation unit n; p (P) fi Distributing coefficients for the power of the power generation unit; p (P) f The total actual output power of the power generation unit;
therefore, the self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units and controls the corresponding power generation units to reduce power generation output power through the multi-interface multi-protocol communication module;
S1052, when the controller module in the adaptive multi-power-generation-unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≤δU ugb When each power generation unit maintains or tracks the current voltage output power of the micro-grid;
s1053, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
further, the specific calculation steps are as follows: during off-grid operation of the micro-grid, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac Fluctuation is less than or equal to voltage fluctuation coefficient range delta and voltage lower limit standard U lgb Product of (i.e. U) ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates the output power of the power generation unit to be increased according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power to be increased to beThe self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn The power generation unit is controlled to release the power of the power generation unit from large to small, and when a controller module in the self-adaptive multi-power generation unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≥δU lgb When each power generation unit maintains or tracks the current voltage output power of the microgrid.
S1054, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≤δU ugb When the micro-grid is in a power-on state, the power generation unit maintains or tracks the current voltage output power of the micro-grid;
the self-adaptive multi-power generation unit controller is used for controlling the voltage change rate threshold lambda according to the micro-grid voltage on Triggering grid connection, executing a grid connection related strategy, and monitoring the outlet voltage U of the power generation unit when a controller module in the self-adaptive multi-power generation unit controller ac ≥δ·U ugb At the time, the increment and decrement of the distributed output power of each power generation unit and the outlet voltage U of the power generation unit are calculated ac ≤δ·U lgb And calculating the released power output power of each power generation unit.
(1) When the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb When the excess voltage delta U of the power generation unit is calculated ac ＝U ac -δ·U ugb The controller module calculates the output power of the power generation unit to be reduced according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation powerThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtainedThe product calculation of the power distribution coefficient of each power generation unit and the output power of each power generation unit is adopted to obtain the distribution actual output power P of each power generation unit 1 '＝P fi ×P 1 ；P 2 '＝P fi ×P 2 ；……P’ n ＝P fi ×P n The method comprises the steps of carrying out a first treatment on the surface of the The self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units; the corresponding power generation unit is controlled to be reduced through the multi-interface multi-protocol communication module Generating output power;
when the controller module in the adaptive multi-power-generation-unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≤δU ugb When each power generation unit maintains or tracks the current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb The voltage upper limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn The output power of the power generation unit is required to be reduced; p (P) 1 ' distributing the output power for the power generation unit 1; p (P) 2 ' distributing the output power for the power generation unit 2; p (P) n ' distributing output power for the power generation unit n; p (P) fi Distributing coefficients for the power of the power generation unit; p (P) f The total actual output power of the power generation unit;
(2) when the outlet voltage U ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates the output power of the power generation unit to be increased according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power to be increased to be The self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn The power generation unit is controlled to release the power of the power generation unit from large to small, and when a controller module in the self-adaptive multi-power generation unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≥δU lgb As each power generation unit maintains or tracksThe current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U lgb The voltage lower limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn Indicating that the output power of the power generation unit needs to be increased.
Further, in the present embodiment 1, as shown in fig. 5, step S106 includes:
s1060, when the self-adaptive multi-generation-unit controller monitors the voltage change rate of the micro gridWhen the self-adaptive multiple power generation unit controller sequentially puts the power generation units into operation according to the power generation power from large to small, wherein DeltaU w Represents the variation of the outlet voltage of the power generation unit lambda on A grid-connected voltage change rate threshold value of the micro-grid; />The voltage change rate of the micro-grid in one sampling period time is represented, and T represents the sampling period;
S1061, the controller module in the self-adaptive multi-generation unit controller monitors the outlet voltage U of the generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
further, the calculation steps are as follows: when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac Voltage fluctuation coefficient range delta and voltage upper limit standard U ugb Product of (i.e. U) ac ≥δ·U ugb At this time, the outlet voltage U of the power generation unit is calculated ac Subtracting the voltage fluctuation coefficient range delta and the voltage upper limit standard U ugb Is multiplied by (a) to obtain the excess voltage DeltaU ac ＝U ac -δ·U ugb The controller module generates a coefficient beta=of the unit generated power according to the voltage variation value of the current preset time period and the coefficient beta=of the unit generated powerThe formula for calculating the output power of the power generation unit to be reduced is delta U/kWThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtained>Thereby obtaining the actual output power distributed by each generating unit through the product calculation of the power distribution coefficient of the generating unit and the output power of each generating unit, namely P 1 '＝P fi ×P 1 ；P 2 '＝P fi ×P 2 ；……P’ n ＝P fi ×P n . The self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units, and the power output protocol codes are sent out and controlled by the multi-interface multi-protocol communication module to reduce the power output power of the corresponding power generation units;
s1062, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≥δU lgb When the micro-grid is in a power-on state, the power generation unit maintains or tracks the current voltage output power of the micro-grid;
s1063, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
further, the specific calculation steps are as follows:
in the process that the generated power is sequentially input from large to small in the self-adaptive multiple power generation unit controller, when the controller module in the self-adaptive multiple power generation unit controller monitors the outlet voltage U of the power generation unit ac Fluctuation is less than or equal to voltage fluctuation coefficient rangeLevel delta and voltage lower limit standard U lgb Product of (i.e. U) ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates and increases the output power of the power generation unit to be according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power The self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn ；
Therefore, the self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units, and the power generation units are controlled to release the power of the power generation units from large to small through the multi-interface multi-protocol communication module;
s1064, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≥δU lgb When the power generation unit maintains or tracks the current voltage output power of the micro-grid, wherein U ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U lgb The voltage lower limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn To increase the output power of the power generation unit.
In this embodiment 1, further, the adaptive multi-power generation unit controller may also adaptively determine the increasing and decreasing values of the output power of the power generation units according to the frequency of the micro-grid, and the specific operation steps are as follows:
when the controller module in the adaptive multi-generation unit controller detects the micro-grid frequency f t1 Less than or equal to the off-grid switching frequency threshold f of the micro-grid β I.e. f t1 ≥f β At the moment, the micro-grid is in an off-grid working state, the load is small, and the self-adaptive multi-power generation unit controller rapidly respondsAccording to the power sequencing of the power generation units at the moment before the micro-grid is off-grid and the current power factor alpha, and according to the power factor judging and controlling principle, namely the operation of the step S104, stopping working of a certain group of power generation units;
meanwhile, the self-adaptive multi-power generation unit controller calculates the power generation unit stopping power p 1 And the read micro-grid frequency f at the current moment t2 The micro-grid frequency f at the current moment t2 Micro-grid frequency f at off-grid time t1 Difference calculation, i.e. Δf= |f t1 -f t2 I, thereby obtaining the current power p of the power generation unit which is stopped 1 The frequency difference delta f of the frequency change at the moment is used for enabling the frequency of the micro-grid to reach the standard frequency f rapidly 0 To meet the micro-grid work requirement, the self-adaptive multi-power generation unit controller calculates the target power p 2 The method comprises the following steps:then->
The self-adaptive multiple power generation unit controller outputs the average power p to the rest power generation units ave1 ,p ave2 ……p aven Summing to obtain sum average power Sigma p avei The self-adaptive multiple power generation unit controller stops the target power p 2 Sum average power Σp avei Comparison, when p 2 ≥∑p avei When all the remaining power generation units stop working;
When p is 2 ＜∑p avei When the self-adaptive multi-power generation unit controller is in a preset state, the self-adaptive multi-power generation unit controller generates power p according to the target power failure 2 The sequence function formula is used with the existing plurality of power generation units, see step S104:
sort(processDate(p ave1 ,p ave2 ,p 2 ……p aven ,p State n), 'descend'), and sequentially screening out the average power of n power generation units from large to small, namely p max1 ,p max2 ,……p maxl ,p 2max ,p maxu ……p maxn The sequenced power p of stopping the transmission 2max With adjacent p maxu And p maxl Power screening of two power values, i.e. p 2 ≤p maxu Power sum p 2 ＞p maxl After the ordered less than and greater than the stop power p are calculated respectively 2 Adjacent power generating unit and stop power p 2 The difference of (2), i.e
Δp 2l ＝p 2 -p maxl And Δp 2u ＝p maxu -p 2 ；
And then Δp is added 2l And Δp 2u Comparing and judging Deltap 2l And Δp 2u Which and stop power p 2 The difference is the smallest, when deltap 2u ＜Δp 2l When taking average power p maxu A power generation unit for stopping power generation; when Deltap 2u ≥Δp 2l When taking average power p maxl The micro-grid frequency stabilizing operation is realized for stopping the power generation unit corresponding to the power generation;
in the above formula, f 0 Is 50Hz of standard frequency; f (f) t2 The micro-grid frequency at the current moment; f (f) t1 The micro-grid frequency is the off-grid time; alpha is a power factor; Δf is the microgrid frequency f at the current time t2 Micro-grid frequency f at off-grid time t1 Absolute value of the difference; p is p 1 The power of the current power generation unit is the off-load power value; p is p 2 Stopping power for the target; p is p 2max For sequenced power down, the value is p 2 ＝p 2max ；p maxu For ordered greater than target power p 2 Adjacent power generation units, p maxl For ordered less than target stall power p 2 Adjacent power generation units; Δp 2l For ordered less than target stall power p 2 Adjacent power generation unit and target power p 2 Is a difference in (2); Δp 2u For ordered greater than target power p 2 Adjacent power generation unit and target power p 2 Is a difference in (2); i is any one integer of 1,2 … … n, where n is a natural number.
Example 2
Referring to fig. 2, a schematic topology of an adaptive multiple power generation unit controller, the adaptive multiple power generation unit controller includes: the controller module, the multi-interface multi-protocol communication module, the short circuit monitoring module, the voltage sensor, the current sensor and the contactor driving module are provided with n contactors, namely K1 and K2 in the graph of fig. 2, wherein Kn is respectively a first contactor, a second contactor and an nth contactor;
the input end ki_1, ki_2, & gt of each contactor is connected with the micro-grid, and is simultaneously connected with a voltage sensor V which is connected in parallel with the micro-grid, the output end ko_1, ko_2, & gt of each contactor is respectively connected with a corresponding current sensor A1, A2, & gt, an in series, and the input end An is respectively connected with a corresponding power generation unit Pv/Pw1, pv/Pw2, & gt, pv/Pw, and the control end K1, K2, & gt, kn of each contactor is respectively connected with the output end Qo1, & gt, qon of a contactor driving module; the input Qi1 of the contactor drive module, qin are both connected to the output of the controller module. The output ends of the current sensors A1, A2 are respectively connected with the input ends Ji1, jin of the short-circuit monitoring module; the output end of the short circuit monitoring module is connected with the input end Ri of the controller module, and the short circuit monitoring module is used for monitoring a short circuit state; the output end of the multi-interface multi-protocol communication module R/To is connected with the input end R/Ti of the controller module;
Further, n locking control ends are arranged in the contactor driving module, the n locking control ends are connected with the output end Jo of the short circuit monitoring module through the input end Ji of the contactor driving module, the short circuit monitoring module transmits locking data to the contactor driving module, and the short circuit monitoring module opens or locks the corresponding contactor through the locking control ends according to the short circuit state of the power generation units Pv/Pw1, pv/Pw2 and the number of the power generation units Pv/Pw2 collected by the controller module.
The controller module is used for receiving current data collected by the current sensors A1, A2, the voltage data collected by the voltage sensors V and short-circuit states of the power generation units Pv/Pw1, pv/Pw2, the controller module controls the connection and the disconnection of the contactors K1, K2, the contactors K2, and the Kn through the contactor driving module.
The controller module is also used for receiving current data acquired by the current sensor, voltage data acquired by the voltage sensor and a short circuit state of the power generation unit, and the controller module controls the connection and disconnection of the contactor through the contactor driving module.
Further, the multi-interface multi-protocol communication module has a plurality of communication interfaces, i.e. T1 … … Ton in fig. 2, each communication interface is connected with a corresponding communication interface Ri1, ri2, # and Rin of the power generation unit through a communication line, and a data output end R/To of the multi-interface multi-protocol communication module is connected with an input end R/Ti of the controller module, so that the controller module can read the data of the power generation unit in real time.
According to the technical scheme, when a certain power generation device fails to short circuit, the short circuit monitoring module can rapidly disconnect the power generation device from the micro-grid and lock the failure state; when the short circuit monitoring module detects that the fault is removed, the corresponding locking control end of the short circuit monitoring module is changed into a release state.
Fig. 3 is a schematic diagram of a micro-grid topology after the adaptive multi-generator unit controller according to the present embodiment is applied.
In this embodiment, the working principle of the adaptive multiple power generation unit controller is as follows:
because the environment where the self-adaptive multi-power-generation-unit controller is located does not have the communication condition with the upper level, the voltage change rate of the voltage rapid change is increased suddenly and the frequency is changed when the parallel/off network occurs based on the micro-grid, so that the parallel/off network state of the micro-grid is identified by utilizing the voltage change rate and the frequency change, and the self-adaptive multi-power-generation-unit controller executes a corresponding control strategy according to different states.
When the micro-grid is in a grid-connected working state, a controller module in the self-adaptive multi-generation unit controller performs working power and state pre-analysis of the generation unit according to the current moment and historical data, and analyzes voltages in different time periods according to historical synchronous generation power and voltage curves in order to avoid abrupt change of the grid in a micro-grid off-grid state The change and the generation power law are respectively found out the maximum value p of the historical contemporaneous power by taking 15 minutes as a period max Minimum voltage U min Sum voltage maximum U max The former describes the maximum load i max The latter describes the load minimum i min This current is the internet current at minimum load. The controller module reads the output currents of all the generating units at the current moment and sums the currents sigma i i Obtaining the output current i of the power generation unit at the off-grid moment of the micro-grid f ＝∑i i -i min And when the micro-grid runs off-grid, the controller module sends out a power reduction protocol code to the power generation unit through the multi-interface multi-protocol communication module according to the analysis result.
And the subsequent process control regulates and controls the output power increment and decrement value of the power generation unit in real time according to the principle that the micro-grid is stable and the power generation of the power generation unit is maximized.
When the micro-grid is in a grid-connected working state, the short circuit monitoring module monitors whether the self-adaptive multi-power generation unit controller and the power generation equipment are in short circuit, when the short circuit is monitored, the controller module firstly sends an instruction to the contactor driving module to control the contactor corresponding to the power generation equipment to be disconnected, meanwhile, the contactor driving module feeds back a short circuit state signal to the controller module, the controller module is locked, namely the contactor driving module controls the contactor to be disconnected, and the short circuit condition is prompted through LED lamplight flickering. When the short circuit monitoring module monitors that no short circuit exists, the controller module of the self-adaptive multi-load response controller unlocks and controls the contactor driving module to switch on the contactor, and meanwhile, the LED lamp light is normally lightened to display so as to prompt that the self-adaptive multi-power-generation unit has short circuit.
It should be specifically noted that, in the embodiments of the present application, the letter n represents a plurality of meanings, but different explanations are made according to specific scenarios or formulas; the other letters are described, and they are not described, but can be obtained from the contents of the specification of the present application or the common general knowledge of those skilled in the art. Therefore, the technical solution of the present application is not made to be unclear, and is not considered as a limitation of the technical solution of the present application.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.

Claims (12)

1. The control method of the self-adaptive multiple power generation unit controller is characterized by comprising the following steps of:
s101, monitoring the power generated by a power generation unit in a preset time period, determining the working state of the power generation unit, and initializing a preset micro-grid-connected voltage change rate threshold value and a micro-grid off-grid voltage change rate threshold value; the preset time period is set according to sampling precision, the preset time periods corresponding to different sampling precision are different, and the generated power in the preset time period comprises historical generated power and current generated power;
S102, under the grid-connected working state of the micro-grid, according to the working state, the historical power and the current power of the power generation unit, predicting and analyzing the increase and decrease power of the power generation unit when the micro-grid is off-grid;
s103, identifying off-grid or grid-connected states according to the off-grid voltage change rate threshold value or the grid-connected voltage change rate threshold value of the micro grid; comprising the following steps:
the self-adaptive multiple power generation unit controller collects power generation power of all power generation units in real time and monitors voltage change rate of the micro-gridAccording to the grid-connected or off-grid state of the micro-grid at the previous moment, passing through the grid-connected voltage change rate threshold lambda of the micro-grid at the current moment on And an off-grid voltage rate of change threshold lambda off Identifying the grid-connected or off-grid state of the current micro-grid, and self-adapting multi-power generation singleThe element controller executes grid connection or off-grid switching according to the voltage change rate threshold;
wherein DeltaU w The outlet voltage variation of the power generation unit is represented, and the voltage variation of the micro-grid can be directly reflected; lambda (lambda) off A micro-grid off-grid voltage change rate threshold; lambda (lambda) on A grid-connected voltage change rate threshold value of the micro-grid;representing the voltage change rate of the micro-grid, and T represents the sampling period;
s104, calculating average power of the power generation unit according to the historical power generation power, judging the order in which the power generation unit stops working according to the average power and the power factor of the power generation unit, and implementing a power generation unit control strategy according to the increase and decrease of the frequency change;
S105, after off-grid triggering according to the off-grid voltage change rate threshold of the micro-grid, the power generation unit determines an increase and decrease value of the output power of the power generation unit according to the outlet voltage; comprising the following steps:
s1050, when the self-adaptive multi-generation-unit controller monitors the voltage change rate of the micro gridWhen the self-adaptive multiple power generation unit controller determines the increasing and decreasing values of the output power of the power generation unit according to the increasing and decreasing power of the power generation unit, wherein DeltaU w Represents the variation of the outlet voltage of the power generation unit lambda off A micro-grid off-grid voltage change rate threshold; />Representing the voltage change rate of the micro-grid, and T represents the sampling period;
s1051, when the adaptive multi-power-generation-unit controller is closed to a specific power generation unit, the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
s1052, when in the adaptive multi-generation unit controllerThe controller module monitors the outlet voltage U of the power generation unit ac ±2％≤δU ugb When the micro-grid is in a power-on state, the power generation unit maintains or tracks the current voltage output power of the micro-grid;
s1053, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
S1054, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≤δU ugb When the power generation unit maintains or tracks the current voltage output power of the micro-grid, wherein U ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb Representing an upper voltage limit criterion;
s106, after grid-connected voltage change rate threshold value of the micro-grid is triggered off-grid, determining an output power increasing and decreasing value and a sequence of operation of the power generation unit according to the outlet voltage of the power generation unit; comprising the following steps:
s1060, when the self-adaptive multi-generation-unit controller monitors the voltage change rate of the micro gridWhen the self-adaptive multiple power generation unit controller sequentially puts the power generation units into operation according to the power generation power from large to small, wherein DeltaU w Represents the variation of the outlet voltage of the power generation unit lambda on A grid-connected voltage change rate threshold value of the micro-grid; />The voltage change rate of the micro-grid in one sampling period time is represented, and T represents the sampling period;
s1061, the controller module in the self-adaptive multi-generation unit controller monitors the outlet voltage U of the generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
s1062, when the controller module in the adaptive multi-power-generation-unit controller monitors the output of the power generation unit Mouth voltage U ac ±2％≥δU lgb When the micro-grid is in a power-on state, the power generation unit maintains or tracks the current voltage output power of the micro-grid;
s1063, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
s1064, when the controller module in the adaptive multi-power-generation-unit controller monitors the outlet voltage U of the power generation unit ac ±2％≥δU lgb When the power generation unit maintains or tracks the current voltage output power of the micro-grid, wherein U ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U lgb Representing the voltage lower limit criteria.
2. The method for controlling an adaptive multi-generator unit controller according to claim 1,
when grid connection is performed, predicting and analyzing the grid separation time to distribute output power to each power generation unit, wherein the method comprises the following steps:
when the micro-grid is in a grid-connected working state, a controller module in the self-adaptive multi-generation unit controller performs working power and state pre-analysis on the generation unit according to the generation power at the current moment and the historical generation power;
according to the historical synchronous power and voltage curve, analyzing the voltage change coefficient of the unit power in different preset time periods And dividing each hour into 4 preset time periods at 15 minutes, and initially setting a voltage change coefficient of unit generated power in each preset time period +.>Iteration of self-learning with increasing data volume to obtain new optimal voltage variation coefficient of unit generated power ∈ ->
Simultaneously, respectively finding out the maximum value p of the historical synchronous power generation power by taking 15 minutes as a preset time period max ＝max(p t1 ,p t2 …p t15 ) Sum voltage minimum U min ＝min(u t1 ,u t2 …u t15 ) U with highest voltage max ＝max(u t1 ,u t2 …u t15 ) The former describes the maximum currentThe latter illustrates that the current is at a minimum +.>The current is the internet current under the condition of minimum load;
when the system is in grid-connected state and normally operates, the controller module reads the output currents of all the generating units at the current moment and sums the output currents to obtain a sum current Sigma i i ；
When i min ≤∑i i ≤i max The sum current sigma i will then be i Subtracting the on-line current to obtain the total output current i of all the power generation units at the off-line moment of the micro-grid f ＝∑i i -i min Thereby outputting a current and a summation current Sigma i through the generating unit at the off-grid moment of the micro-grid i The ratio of the output current coefficient of each power generation unit at off-grid time is obtained
Whereby the output current coefficient i at off-grid time through each power generation unit fi Calculating the product of the current output current of each power generation unit to obtain the distribution output current of each power generation unit at the future off-grid moment, wherein the calculation formula is i '' 1 ＝i fi ×i 1 ；i′ 2 ＝i fi ×i 2 ；……i′ n ＝i fi ×i n ；
Wherein i' 1 Distributing output power to the power generation unit 1A stream; i' 2 Distributing output current to the power generation unit 2; i' n Distributing output current for the power generation unit n; i.e fi The output current coefficient of each power generation unit at off-grid time is calculated; i.e f And (5) outputting the total current of all the power generation units at the off-grid moment of the micro-grid.
3. The method of controlling an adaptive multi-power generation unit controller according to claim 2, wherein selecting an optimal power generation unit combined output power comprises:
screening output efficiency of power generation unit by using screening functionAnd generating unit output efficiency->Output efficiency +.>The power generation unit of (1) reduces output current and improves output efficiency +.>The output current of the power generation unit ensures the output efficiency of the power generation unit of the output current to be +>
Setting current data to be screened as data in]Screening target value is i f ＝∑i i -i min Intermediate results of the screening procedure were tmpres [ i ]]The screening function is processDate (idx, sum); and then, taking the highest power generation efficiency of the power generation unit and the lowest line loss as constraint conditions, selecting the optimal combined output power of the power generation unit to obtain an optimal combined selection function as follows:
wherein the objective function is the output current i of the selected power generation unit f ＝∑i i -i min Constraint s.t. is minimum energy loss Corresponding power wave bands with highest power generation efficiency of the power generation unit are defaulted that the inverter works at 60% -80% of rated power P N,i The calculation formula is->
Establishing a protocol code for closing or reducing power output corresponding to the power generation unit, and when the micro-grid runs off-grid, the controller module sends the protocol code for reducing power to the power generation unit through the multi-interface multi-protocol communication module according to the analysis result;
in the formula, beta is a voltage change coefficient of unit power generation power in different preset time periods, deltaU represents a voltage change value in the corresponding preset time period, and kW represents the unit power generation power; u (u) t1 A 1 st minute voltage that is a 15 th minute period of historical synchronization; u (u) t2 2 nd minute voltage for 15 th minute period of history synchronization; u (u) t15 15 th minute voltage, which is a 15 th minute period of historical synchronization; p is p t1 1 st minute power for 15 minute period of history synchronization; p is p t2 2 nd minute power for 15 th minute period of history synchronization; p is p t15 15 th minute power for 15 th minute period of historical synchronization; i.e max Maximum current in 15 minutes period for historical synchronization; p is p max Maximum power within 15 minutes of the history synchronization; u (U) min Minimum voltage within 15 minutes period for the contemporaneous history; u (U) max Maximum voltage within 15 minutes period for historical synchronization; i.e min Minimum current within 15 minutes of history synchronization; i.e fi The ratio of the output current of the power generation unit to the summation current of the power generation unit at the current moment; i.e f For the total output current of all the power generation units at off-grid time, P N,i Which represents the rated power of the electric motor,to minimize the loss of energy, Σi i Representing the summed current.
4. The method for controlling an adaptive multi-generator unit controller according to claim 1, wherein the off-grid or on-grid state is identified by a micro-grid off-grid voltage change rate threshold, comprising:
the self-adaptive multiple power generation unit controller collects power generation power of all power generation units in real time and monitors voltage change rate of the micro-gridAccording to the grid-connected or off-grid state of the micro-grid at the previous moment, passing through the grid-connected voltage change rate threshold lambda of the micro-grid at the current moment on And an off-grid voltage rate of change threshold lambda off Identifying the grid-connected or off-grid state of the current micro-grid, and executing grid-connected or off-grid switching by the self-adaptive multi-power generation unit controller according to the voltage change rate threshold;
judging the influence on the voltage of the micro-grid according to the change of the power generated by the multiple power generation units, and collecting the outlet voltage U of the power generation unit controller at the previous moment t0-1 Voltage U of power generation unit controller at current moment t0 The current power generation unit change power Δp subtracted from the absolute value of the difference n The difference of the beta product of the voltage change coefficient of the unit power generation is calculated as delta U w ＝|U t0-1 -U t0 |-β·ΔP n Wherein U is t0-1 Collecting the outlet voltage of the power generation unit for the previous moment; u (U) t0 Collecting the outlet voltage of the power generation unit for the current moment; beta is the voltage change coefficient of the unit power generation, and the calculation formula isΔu is the voltage change of the micro-grid caused by the power change of the multiple power generation units; ΔP n Output power Sigma P of all power generation units acquired at the previous moment i_t0 And the output power difference sigma of all the power generation units acquired at the current momentP i_t0-1 Is calculated as delta P n ＝|∑P i_t0 -∑P i_t0-1 |。
5. The control method of an adaptive multi-power generation unit controller according to claim 1, wherein determining the order in which the power generation units are stopped based on the average power and the power factor of the power generation units, comprises:
when the power factor alpha is more than or equal to 0.9 and less than or equal to 1, controlling the power generation units to stop working in sequence from large to small;
when the power factor alpha is less than or equal to 0.9, the power generation unit is controlled to maintain the current working state, wherein alpha represents the power factor.
6. The control method of an adaptive multi-power generation unit controller according to claim 1, wherein the order in which the power generation units are stopped is determined based on the average power and the power factor of the power generation units, further comprising:
Calculating historical power generation power at each moment in a preset time period;
averaging the historical power generation power at all times in a preset time period to obtain the average power of the residual power generation units in the preset time period;
summing the average power of the rest power generation units to obtain summed average power;
comparing the summed average power to a target stall power;
if the target power is not smaller than the sum average power of the rest power generation units, all the rest power generation units are stopped;
if the target power is smaller than the sum average power, introducing a sort function to construct a descending order expression G from large to small of the sum average power of each of the target power and the rest power generation units 2 Descending order of functional expression G 2 The following are provided:
G 2 ＝sort(processDate(p ave1 ,p ave2 ,p 2 ……p aven ,p State ,n),'descend')；
G 2 for this purpose, the target power and the sum average power of the remaining power generation units are arranged from large to small according to the sequential function G 2 The order of stopping the power generation unit is adjusted in real time; wherein p is ave1 Representing the summed average power, p, of the remaining first power generation units ave2 Representing the summed average power, p, of the second power generation unit aven Representing the summed average power, p, of the remaining nth power generating units 2 Indicating target stop power, p State Indicating the working state of the power generation units, wherein n indicates the number of the residual power generation units, and sort is a ranking function at a certain moment; the processDate is a function for screening out the non-online load equipment, the PSnState is the load equipment state, the equipment is online when psnstate=1, and the equipment is not online when psnstate=0; 'desend' is denoted as a descending order.
7. The method according to claim 1, wherein the adaptive multiple power generation unit controller further adaptively determining an increase and decrease value of the power generation unit output power or calculation of the power generation unit shutdown power according to the frequency of the micro grid comprises:
wherein f 0 Is 50Hz of standard frequency; Δf is the absolute value of the difference between the frequency of the micro-grid at the off-grid time and the frequency of the micro-grid at the previous time; p is p 1 The power of the power generation unit which is stopped at present; p is p 2 Stopping power for the target;
calculating the difference value between the adjacent power generation units with smaller than and larger than the power stop power after sequencing the sequential functions;
if Δp 2u ＜Δp 2l Average power p is taken maxu A power generation unit for stopping power generation;
if Δp 2u ≥Δp 2l Average power p is taken maxl To stop generating electricity A corresponding power generation unit;
wherein Δp 2l For ordered less than target stall power p 2 Adjacent power generation unit and target power p 2 Is a difference in (2); Δp 2u For ordered greater than target power p 2 Adjacent power generation unit and target power p 2 Is a difference in (2); i is any integer of 1,2 … … n, where n is a natural number; p is p maxu For ordered greater than target power p 2 Adjacent power generation units, p maxl For ordered less than target stall power p 2 Adjacent power generation units.
8. The control method of an adaptive multi-generator unit controller according to claim 1, wherein the adaptive multi-generator unit controller is based on a micro-grid voltage change rate threshold λ off Triggering off-grid, executing a control strategy related to off-grid, closing a specific power generation unit or reducing the output power of the power generation unit, and when a controller module in the self-adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating the increment and decrement of the distributed output power of each power generation unit when the output voltage U of the power generation unit is ac ≤δ·U lgb And calculating the power released by each power generation unit.
9. The method for controlling an adaptive multi-generator unit controller according to claim 1 or 8, wherein,
(1) When the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb At this time, the outlet voltage U of the power generation unit is calculated ac Subtracting the voltage fluctuation coefficient range delta and the voltage upper limit standard U ugb Is multiplied by (a) to obtain the excess voltage DeltaU ac ＝U ac -δ·U ugb The controller module is used for controlling the controller module according to the current preset time periodThe coefficient beta=delta U/kW of the voltage variation value and the unit power generation power is calculated to reduce the power generation unit output power, and the formula is thatThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtained>Calculating the product of the power distribution coefficient of each power generation unit and the output power of each power generation unit to obtain the distribution actual output power P 'of each power generation unit' 1 ＝P fi ×P 1 ；P′ 2 ＝P fi ×P 2 ；……P′ n ＝P fi ×P n ；
The self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units, and the power output protocol codes are sent out by the multi-interface multi-protocol communication module to control the corresponding power generation units to reduce the power output power;
When the controller module in the adaptive multi-power-generation-unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≤δU ugb When each power generation unit maintains or tracks the current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb The voltage upper limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn The output power of the power generation unit is required to be reduced; p'. 1 Distributing output power to the power generation unit 1; p'. 2 Distributing output power to the power generation unit 2; p'. n Distributing output power for the power generation unit n; p (P) fi Distributing coefficients for the power of the power generation unit; p (P) f The total actual output power of the power generation unit;
(2) when the outlet voltage U of the power generation unit ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac Fluctuation is less than or equal to voltage fluctuation coefficient range delta and voltage lower limit standard U lgb Product of (i.e. U) ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates the output power of the power generation unit to be increased according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power to be increased to beThe self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn The power generation unit is controlled to release the power of the power generation unit from large to small, and when a controller module in the self-adaptive multi-power generation unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≥δU lgb When each power generation unit maintains or tracks the current voltage output power of the microgrid.
10. The control method of an adaptive multi-generator unit controller according to claim 1, wherein the adaptive multi-generator unit controller is based on a micro-grid voltage change rate threshold λ on Triggering grid connection, executing a grid connection related strategy, and monitoring the outlet voltage U of the power generation unit when a controller module in the self-adaptive multi-power generation unit controller ac ≥δ·U ugb At the time, the increment and decrement of the distributed output power of each power generation unit and the outlet voltage U of the power generation unit are calculated ac ≤δ·U lgb And calculating the released power output power of each power generation unit.
11. A control method of an adaptive multi-generator unit controller according to claim 1 or 10, characterized in that,
(1) When the outlet voltage U of the power generation unit ac ≥δ·U ugb Calculating a reduction value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≥δ·U ugb When the excess voltage delta U of the power generation unit is calculated ac ＝U ac -δ·U ugb The controller module calculates the output power of the power generation unit to be reduced according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation powerThe controller module reads the output power of all the generating units at the current moment and sums the output power to obtain sum power Sigma P i Sum power Σp i Subtracting the output power of the power generation unit to be reduced to obtain the total actual output power P of the power generation unit f ＝∑P i -p fn Total actual output power and sum power Σp by the power generation unit i The ratio of the power distribution coefficients of the power generation units is obtained>The product calculation of the power distribution coefficient of each power generation unit and the output power of each power generation unit is adopted to obtain the distribution actual output power P 'of each power generation unit' 1 ＝P fi ×P 1 ；P′ 2 ＝P fi ×P 2 ；……P′ n ＝P fi ×P n The method comprises the steps of carrying out a first treatment on the surface of the The self-adaptive multi-power generation unit controller distributes power output protocol codes according to the corresponding power generation units; the multi-interface multi-protocol communication module is used for sending out and controlling the corresponding power generation unit to reduce the power generation output power;
when self-adaptive multiple power generation unit control The controller module in the controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≤δU ugb When each power generation unit maintains or tracks the current voltage output power of the micro-grid;
wherein U is ac Represents the outlet voltage of the power generation unit, delta represents the voltage fluctuation coefficient range, U ugb The voltage upper limit standard is represented, beta is the voltage increase coefficient of the historical synchronous unit generation power, deltaU is the voltage increase value of the historical synchronous unit generation power, deltaU ac To exceed the voltage, p fn The output power of the power generation unit is required to be reduced; p'. 1 Distributing output power to the power generation unit 1; p'. 2 Distributing output power to the power generation unit 2; p'. n Distributing output power for the power generation unit n; p (P) fi Distributing coefficients for the power of the power generation unit; p (P) f The total actual output power of the power generation unit;
(2) when the outlet voltage U ac ≤δ·U lgb Calculating the added value of the output power of the power generation unit;
when the controller module in the adaptive multi-power generation unit controller monitors the outlet voltage U of the power generation unit ac ≤δ·U lgb At the time, the voltage fluctuation coefficient range delta and the voltage lower limit standard U are used lgb Product of (2) and the outlet voltage U of the power generation unit ac Performing difference calculation to obtain an excess voltage delta U ac ＝δ·U lgb -U ac The controller module calculates the output power of the power generation unit to be increased according to the voltage change value of the current preset time period and the coefficient beta=delta U/kW of the unit power generation power to be increased to be The self-adaptive multi-power generation unit controller increases the output power p of the power generation unit according to the requirement fn The power generation unit is controlled to release the power of the power generation unit from large to small, and when a controller module in the self-adaptive multi-power generation unit controller monitors that the outlet voltage of the power generation unit tends to be stabilized at U ac ±2％≥δU lgb When each power generation unit maintains or tracks the current voltage output power of the microgrid.
12. An adaptive multiple power unit controller, characterized in that a control method of an adaptive multiple power unit controller according to any one of claims 1 to 11 is adopted, the adaptive multiple power unit controller comprising: the device comprises a controller module, a multi-interface multi-protocol communication module, a short circuit monitoring module, a voltage sensor, a current sensor, a contactor driving module and a contactor;
the input end of the contactor is connected with the micro-grid, the micro-grid is connected with the voltage sensor, the output end of the contactor is connected with the power generation unit through the current sensor, and the control end of the contactor is connected with the output end of the contactor driving module; the input end of the contactor driving module is connected with the output end of the controller module; the output end of the current sensor is connected with the input end of the short circuit monitoring module; the output end of the short circuit monitoring module is connected with the input end of the controller module, and the short circuit monitoring module is used for monitoring a short circuit state; the communication interface of the multi-interface multi-protocol communication module is connected with the communication interface of the power generation unit through a communication line, the output end of the multi-interface multi-protocol communication module is connected with the controller module, and the controller module reads the data information of the power generation unit in real time;
The contactor driving module is provided with n locking control ends, is in communication connection with the contactor driving module through a short circuit monitoring module, and controls the locking control ends corresponding to the contactor driving module to be connected and disconnected according to the short circuit state of the power generation unit acquired by the controller module;
the controller module is used for receiving current data acquired by the current sensor, voltage data acquired by the voltage sensor and a short-circuit state of the power generation unit, judging an off-grid state of the micro-grid through a voltage change rate threshold value in unit time, and controlling the on-off of the contactor through the contactor driving module.
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