CN106410812A - Network voltage out-of-limit adjusting method for use after access of ultrahigh voltage - Google Patents
Network voltage out-of-limit adjusting method for use after access of ultrahigh voltage Download PDFInfo
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- CN106410812A CN106410812A CN201610785627.1A CN201610785627A CN106410812A CN 106410812 A CN106410812 A CN 106410812A CN 201610785627 A CN201610785627 A CN 201610785627A CN 106410812 A CN106410812 A CN 106410812A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a network voltage out-of-limit adjusting method for use after access of an ultrahigh voltage. In the method, a power grid simulation model accessed by a 1000kV alternating-current ultrahigh-voltage line is established by PSD-BPA software; the safety and stability of a power grid are analyzed; and the problem of voltage out-of-limit is solved by a sensitivity approach. The method comprises the following steps: firstly, performing load flow analysis on the power grid, and performing N-1 static safety analysis on a line of 500kV and over; secondly, setting an ultrahigh-voltage drop-point three-phase short-circuit failure to perform transient stability analysis on the power grid in conjunction with a stable curve analysis tool; thirdly, analyzing the voltage out-of-limit problem of a 220kV power grid on the basis of safety and stability analysis results of the power grid, and providing a voltage adjusting scheme in conjunction with a sensitivity analyzing method; and finally, calculating a sensitivity value of reactive compensation near an out-of-limit voltage node, determining the magnitude of the reactive compensation, and adjusting the voltage in conjunction with reactive compensation of a load node and a no-load voltage ratio of a transformer. Through adoption of the method, simulation is performed on the PSD-BPA software, so that the out-of-limit voltage can be effectively adjusted into a reasonable range through the scheme.
Description
Technical field
The present invention relates to technical field of electric power system control, the power grid out-of-limit after more particularly, to a kind of extra-high voltage access
Method of adjustment.
Background technology
In China, extra-high voltage refers to the voltage of ± 800 kilovolts and above unidirectional current and 1000 kilovolts and above alternating current
Grade.Extra-high pressure energy greatly promotes the conveying capacity of China's electrical network.The data display providing according to State Grid Corporation of China, primary Ioops are special
High-voltage direct current power grid can send 6,000,000 kilowatts of electricity, is equivalent to 5 to 6 times of existing 500 Kilovolt Direct Current nets, and power transmission away from
From being also 2 to 3 times of the latter, therefore efficiency greatly improves.Additionally, according to State Grid Corporation of China's measuring and calculating, conveying the electricity of same power
Amount, if can be than the land resource using 500 kilovolts of high-tension lines savings 60% using extra high voltage line transmission of electricity.
The extra-high power transmission efficiency that is pressed with is high, and loss is low, and the advantages of lack is taken up an area in corridor.The access energy effective support receiving end of extra-high voltage
The supply of electric power of electrical network, have also been changed the grid structure of electrical network, and the safety and stability of electrical network is had a great impact.In view of electrical network
Due to being subject to outward electric power more, receiving end Voltage-stabilizing Problems are gradually obvious, it is possible that voltage out-of-limit problem.Voltage is higher or inclined
Low all the safety and stability of electrical network can be caused with serious harm, therefore out-of-limit voltage node will be taken with rational adjustment side
Case.The measure of Voltage Cortrol has change generator voltage, adjustment transformer voltage ratio, compensation equipment etc..
At present, optimization method is the main solution solving the problems, such as voltage out-of-limit.This method one side can expire
Sufficient inequality constraints, makes system operation in a safe and reliable scope, on the other hand by asking to the optimum of object function
Solution is so that this operating point equally operates in the most economical running status of system.But, the method there is also following defects：
When voltage out-of-limit problem occurs it is most important that improve safety rather than the guarantee of system with speed the fastest
System has minimum operating cost.Prior art is not made point to the voltage out-of-limit problem of the electrical network after extra-high voltage access
Analysis, provides pressure regulation scheme.
Content of the invention
The technical problem to be solved in the present invention is the security and stability of electrical network after research extra-high voltage accesses, and proposes voltage and get over
The Adjusted Option of limit problem.
In order to solve the power grid out-of-limit method of adjustment after a kind of this extra-high voltage accesses, comprise the steps：
S100：With PSD-BPA software, set up the power system simulation model after 1000kV UHVAC transmission line accesses, such as
Shown in Fig. 2；
S200：Static security analysis obtain：
During normal condition or during N-1 malfunction, extra-high voltage access after circuit heavy duty in electrical network or overload situations；
S300：Transient stability analysis obtain：
Consider the fault of most serious, first on extra-high voltage 1000kV alternating current circuit, be provided with three phase short circuit fault, pass through
PSD-BPA stability program is analyzing the impact to stability for the ultrahigh voltage alternating current transmission lines fault.Again near extra-high voltage drop point
Two 500kV circuits be provided with three phase short circuit fault, the transient stability of analysis electrical network.
S400：Out-of-limit voltage node scanning, setting voltage lower limit 0.95, upper voltage limit 1.05；
S500：Calculate the sensitivity matrix of out-of-limit voltage node：
S600：Relatively Sensitirity va1ue, determines and carries out reactive-load compensation；；
S700：After reactive-load compensation, still there is sub-load node voltage out-of-limit, adjust on-load transformer tap changer no-load voltage ratio
Carry out pressure regulation；
S800：Carrying out out-of-limit voltage node scanning again, if also there is the node of voltage out-of-limit, returning to S500；If no
Exist, then adjustment terminates.
In described step S100, generator model is using the secondary transient state quadrature axis potential E with Damper Windingq", d-axis potential
Ed" variation model, and consider the effect of excitation, PSS and governing system.Load model adopts 60% invariable power, 40% constant-impedance
Load model.Active, the Null Frequency factor is 1.8, -2.0.
In described step S500, specifically：
A1：Variation delta U of calculated load node voltageDWith load bus reactive-load compensation Δ QDBetween sensitivity relation
When, Δ QDAs control variable.
When load bus increases reactive-load compensation it is assumed that generator reactive power exports constant, i.e. Δ QG=0
Formula (1) obtains through abbreviation：ΔUD=RDDΔQD(2)
RDDIt is Δ UDWith Δ QDBetween sensitivity matrix, its resistive dimension, it is " the matrix after augmentation by-B
Load bus in the inverse part submatrix related to reactive-load compensation.
Derivation can obtain：
Wherein LDGAnd LGDFor the transadmittance between electromotor node and load bus, LGGFor the self-admittance of electromotor node,
LDDFor B ".
A2：Variation delta U of research load bus voltageDWith generator reactive power exporting change amount Δ QGBetween spirit
During sensitivity relation, Δ QGAs control variable.
When generator reactive power exporting change it is assumed that load bus reactive-load compensation (or idle injection) is called 0, i.e. Δ
QD=0
Then formula (1) can be deformed into：ΔUD=RDGΔQG(4)
RDGRepresent Δ UDWith Δ QGBetween sensitivity matrix, its meaning is that-B " inverts after matrix augmentation, in inverse matrix
The electromotor node part submatrix related with load bus.
Derivation can obtain：
A3：Variation delta U of calculated load node voltageDDuring sensitivity relation and transformer voltage ratio Δ t between, adjust
The tap of adjustable no-load voltage ratio transformator can change the voltage of load bus.It is assumed that transformer voltage ratio changes Δ t, if now generating electricity
Machine busbar voltage is constant, and load bus is idle, and injection is also constant, then load bus voltage will change.By sensitivity relationThen there is Δ UD=TDtΔt
Wherein, TDtFor Δ UDSensitivity matrix and Δ t between
Derivation can obtain：
Wherein, LDDFor not comprising the imaginary part of the bus admittance matrix of PV node.
In described step S600, according to factor of merit order from small to large, find out out-of-limit voltage node factor of merit maximum
Value, selects the reactive-load compensation amount corresponding to maximum, carries out reactive-load compensation to the node participating in voltage-regulation.
The present invention proposes the power grid out-of-limit method of adjustment after a kind of extra-high voltage accesses.The method utilizes PSD-BPA
Software establishes the power system simulation model after 1000kV UHVAC transmission line accesses, and analyzes the security and stability of electrical network and transports
Solve the problems, such as voltage out-of-limit with Sensitivity Method.
First, electrical network has been carried out with the N-1 static security analysis of tidal current analysis and 500kV and Above Transmission Lines.Secondly, pass through
Setting extra-high voltage drop point three phase short circuit fault, in conjunction with curve of stability analytical tool, has carried out transient stability analysis to electrical network.So
Afterwards, based on the result of the security and stability analysis of electrical network, analysis has drawn 220kV power grid out-of-limit problem, in conjunction with sensitive
Degree analysis method is it is proposed that voltage regulation scheme.Finally, calculate the Sensitirity va1ue of out-of-limit voltage node reactive-load compensation nearby, really
Determine the size of reactive-load compensation, the method in conjunction with load bus reactive-load compensation and transformer voltage ratio adjustment carries out Voltage Cortrol.?
Emulation is carried out on PSD-BPA software it was demonstrated that the program can effectively more voltage limit be transferred within zone of reasonableness.
Brief description
Fig. 1 is the flow chart of the power grid out-of-limit method of adjustment after a kind of extra-high voltage access in present example；
Fig. 2 is the phantom figure in present example.
Specific embodiment
Sensitivity Analysis Method is sensitive analysis is a kind of classical electric network analysis method, and it is based on network equation
Linearisation, its advantage is simple and computational efficiency is high, mutual between main research power system controlled variable and state variable
Variation relation.Electricity be can apply to by the method that Calculation of Sensitivity obtains the relation between controlled variable and controlled node voltage
Among pressure adjustment.After extra-high voltage can be accessed by the present invention, the security and stability of electrical network is combined with voltage out-of-limit problem, uses
Sensitivity Analysis Method, in conjunction with several adjusting pressure measures, adjusts out-of-limit voltage node.
Below in conjunction with the accompanying drawings, simulation example is elaborated.The invention provides the electrical network after a kind of extra-high voltage access
Voltage out-of-limit adjusting method, comprises the steps：
S100：Set up the power system simulation model after 1000kV UHVAC transmission line accesses.Set up power system simulation model, can
To provide data by Utilities Electric Co., realized by PSD-BPA professional software.
As shown in Fig. 2 planning Huainan Nanjing Shanghai UHVAC transmission line in 2016 accesses Shanghai, the present invention is to advise
On the basis of Shanghai Summer peak load operation parameters in 2016 in drawing, extra-high voltage AC circuit Suzhou is to the Shanghai electricity practicing pool section access
Net is calculating network.Generator model is using the secondary transient state quadrature axis potential E with Damper Windingq", d-axis potential Ed" variation model,
And consider the effect of excitation, PSS and governing system.Load model adopts 60% invariable power, 40% constant-impedance load model.Have
Work(, the Null Frequency factor are 1.8, -2.0.
The main grid structure model of Shanghai Power Network is made up of Shanghai Power Network 500kV electrical network and 220kV backbone's electric network model.
Set up Shanghai 500 kV Grid model, outer two factories turn round and look at great distance Dong Ting Wei Nan including the poplar row that creeps
The 500kV dual-ring network that bridge Xinyu nasal mucus river rising in Ningxia and flowing into central Shaanxi Huang Du creeps, and Gu Luyuan east/high Mibayashi of poplar and Si Jing new
The 500kV south semi-ring that the remaining experienced pool/south bridge booth is defended.Gu Luzhan mono- loop line goes out string and runs.Simultaneously pass through Huang Du Suzhou two-wire,
Creep granary two-wire, totally 6 times 500kV circuits are connected Mibayashi Fen lake two-wire respectively with Jiangsu, Zhejiang power grid.Pass through ±
The preferably magnificent direct current of 500kV, ± 500kV Ge Nan direct current, ± 800kV give extra-high voltage direct-current and ± 500kV woods maple direct current and Central China again
Electrical network is got in touch with.
Set up Shanghai 220kV electrical network, be centered on 500kV transformer station and large power plant, define 220kV poplar row, slowly
Row, Huang Du, Si Jing, south bridge, Yang Gao, Gu Lu, the Far East, booth are defended, Propofol 1resenius, practice the 11 big partition power grid such as the pool.Each point under normal circumstances
Solve inscription of loop between area's electrical network, each via related 220kV central station, intermediate station, terminal station to next stage distribution network and
Customer power supply.
Huainan-Nanjing-Shanghai 1000kV AC extra high voltage accesses Shanghai Power Network, District of Shanghai 1000kV and 500kV electrical network
Electromagnetic coupling mode will be taken, and constitute three-level electromagnetic looped network with Jiangsu part 220kV electrical network.
After handling each model well, by the line parameter circuit value obtaining, transformer parameter, load power parameter, electromotor
Go out force parameter etc. to insert in BPA analysis software, carry out Load flow calculation.Carry out the process of Load flow calculation using BPA program, mainly
The process that the * .dat file to BPA enters edlin, i.e. filling node card, Line cards, transformator card and basic control statement
Process.
S200：Carry out static security analysis, when knowing normal condition or N-1 malfunction, in electrical network after extra-high voltage access
Circuit heavy duty or overload messages.
A kind of implementation of the present invention is to carry out N-1 fault scanning with PSD-BPA software, and this professional software is through input
After the program of N-1 fault scanning, circuit heavy duty or the overload messages in electrical network after extra-high voltage accesses can be automatically generated.
Or, after PSD-BPA professional software carries out static security analysis order, system is known automatically taking Fig. 2 as a example
Following information：During normal condition, nearby there is not heavy duty or overload problem and 500kV electricity in 500kV circuit and main transformer to high pressure drop point
There is not voltage out-of-limit problem in net, but heavily loaded problem in the 220kV circuit that is connected with white silk pool station, and line load occurs in that and exceedes yet
Rated value 70% case of heavy load.
During N-1 malfunction, in the case of electrical network 500kV and 1000kV circuit generation one loop line broken string, another loop line is not
Overload situations occur.
S300：Carry out transient stability process, obtain the transient stability information of electrical network.
When normal condition that step S200 is known or N-1 malfunction, extra-high voltage access after circuit heavy duty in electrical network or
Overload messages.Fault transient is first arranged from the circuit that the fault of most serious starts stably evaluate and test.Using PSD-BPA professional software
Three phase short circuit fault detection is selected on this circuit, its software system just can analyze specifically stablizes information.Then again to it
Being utilized respectively PSD-BPA professional software on the circuit of its heavy duty or overload selects three phase short circuit fault to detect on this circuit,
Specifically give its testing result.
Such as, or with Fig. 2 as embodiment it is considered to the fault of most serious, first revive in extra-high voltage 1000kV alternating current circuit state
Spy-state's white silk is provided with three phase short circuit fault on the pool, analyzes ultrahigh voltage alternating current transmission lines fault by PSD-BPA stability program
Impact to stability.Two 500kV circuit state Su Te-Hu Huangdu near extra-high voltage drop point and Shanghai Si Jing-Shanghai Lian Tang again
It is provided with three phase short circuit fault, the transient stability of analysis electrical network.Result is as shown in table 1.
Table 1 transient stability analysis result
| Faulty line | Fault end | Fault loop number | Transient angle stability | Enhancement of Transient Voltage Stability |
| State Su Te-state Lian Tang | Practice the pool | 1 | Stable | Stable |
| State Su Te-state Lian Tang | Practice the pool | 2 | Stable | Stable |
| State Su Te-Shanghai Huang Du | Huang Du | 1 | Stable | Stable |
| State Su Te-Shanghai Huang Du | Huang Du | 2 | Stable | Stable |
| Shanghai Si Jing-Shanghai Lian Tang | Si Jing | 1 | Stable | Stable |
| Shanghai Si Jing-Shanghai Lian Tang | Si Jing | 2 | Stable | Stable |
S400：Out-of-limit voltage node scanning, such as, setting voltage lower limit are carried out according to voltage bound set in advance
0.95, upper voltage limit 1.05, it can scan the out-of-limit voltage node meeting condition, and out-of-limit voltage node can be one,
Can also be multiple or do not have.
S500：Calculate the sensitivity matrix of out-of-limit voltage node.
In described step S500, specifically：
A1：Variation delta U of calculated load node voltageDWith load bus reactive-load compensation Δ QDBetween sensitivity relation
When, Δ QDAs control variable.
When load bus increases reactive-load compensation it is assumed that generator reactive power exports constant, i.e. Δ QG=0
Formula (1) obtains through abbreviation：ΔUD=RDDΔQD(2)
RDDIt is Δ UDWith Δ QDBetween sensitivity matrix, its resistive dimension, it is " the matrix after augmentation by-B
Load bus in the inverse part submatrix related to reactive-load compensation.
Derivation can obtain：
Wherein LDGAnd LGDFor the transadmittance between electromotor node and load bus, LGGFor the self-admittance of electromotor node,
LDDFor B ".
A2：Variation delta U of research load bus voltageDWith generator reactive power exporting change amount Δ QGBetween spirit
During sensitivity relation, Δ QGAs control variable.
When generator reactive power exporting change it is assumed that load bus reactive-load compensation (or idle injection) is called 0, i.e. Δ
QD=0
Then formula (1) can be deformed into：ΔUD=RDGΔQG(4)
RDGRepresent Δ UDWith Δ QGBetween sensitivity matrix, its meaning is that-B " inverts after matrix augmentation, in inverse matrix
The electromotor node part submatrix related with load bus.
Derivation can obtain：
A3：Variation delta U of calculated load node voltageDDuring sensitivity relation and transformer voltage ratio Δ t between, adjust
The tap of adjustable no-load voltage ratio transformator can change the voltage of load bus.It is assumed that transformer voltage ratio changes Δ t, if now generating electricity
Machine busbar voltage is constant, and load bus is idle, and injection is also constant, then load bus voltage will change.By sensitivity relationThen there is Δ UD=TDtΔt
Wherein, TDtFor Δ UDSensitivity matrix and Δ t between
Derivation can obtain：
Wherein, LDDFor not comprising the imaginary part of the bus admittance matrix of PV node.
Or, according to above-mentioned step, the result of calculating is as shown in table 2 taking Fig. 2 as a example；
Table 2 Calculation of Sensitivity result
S600：Select several principles of adjusting pressure measure：Initially with Generator Voltage Regulation.In the case of idle abundance, excellent
First using change load tap changer pressure regulation.In the case of idle deficiency, need using compensation equipment.The present invention enters to electrical network
Line sensitivity analysis it was therefore concluded that：Reactive disturbance is big to voltage variations affect, will carry out pressure regulation by first compensating reactive power, then adopt
Change load tap changer pressure regulation.Therefore, compare the Sensitirity va1ue of each voltage out-of-limit node, determine and carry out reactive-load compensation.
Although sensitivity index can determine the position of reactive-load compensation, the quantity of reactive-load compensation mount point cannot be determined
And the size of compensation dosage.Sensitivity index is a state index, and it is only capable of the running status of reflection system certain point.Cause
And it is impossible to only determine the position of reactive-load compensation with sensitivity index, also need the dynamic characteristic of consideration system and non-linear, and
Combine with Practical Project, so that it is determined that the position of reactive-load compensation and size.
A kind of implementation of step S600 can be：According to factor of merit order from small to large, find out this and get over voltage limit
Node factor of merit maximum, selects the reactive-load compensation amount corresponding to maximum, carries out idle benefit to the node participating in voltage-regulation
Repay, the reactive power compensator such as switching shnt capacitor.
Shnt capacitor can connect in groups as needed, can be grouped and be concentrated use in, and can disperse to install, provide on the spot
Idle, thus reducing line power loss and voltage loss；Capacitor can also be accomplished, with voltage pulsation grouping switching, to add
Capacitor running wastage is little, and investment cost is low, and therefore, capacitor is still to apply most common reactive-load compensation to set in current electrical network
Standby.However, in underload it should excise the part on node or even whole capacitor.
S700：After reactive-load compensation, if still there being sub-load node voltage out-of-limit, Load adjustment node place bus corresponds to
Main transformer tap no-load voltage ratio carry out pressure regulation, select to make this load bus voltage return to the decomposition first gear position within limit value.
Such as still a kind of embodiment is taking Fig. 2 as a example：Result is as shown in table 3；
Table 3 has load transformator adjustment result
S800：Carrying out out-of-limit voltage node scanning again, if also there is the node of voltage out-of-limit, returning to S500；If no
Exist, then adjustment terminates.
Analyze from principle and why use Sensitivity Analysis Method, in conjunction with adjusting pressure measure, adjust out-of-limit voltage node.
Sensitivity is the differential relationship using physical quantitys some in system, the method to obtain sensitivity between variable.Root
Take corresponding measure can improve security of system according to sensitivity index, improve stability and the economy of system.And the party
Without iteration, there is not constringent problem in method, operation is implemented more convenient.Therefore Sensitivity Analysis Method is in power system
There is important researching value, and be widely used in power system numerous areas.
Sensitivity index has obtained relatively broad application in voltage stabilization research.Can be judged with sensitivity index
The voltage stability of system；Judge weak node；Determine reactive-load compensation position, thus for install reactive power compensator provide according to
According to.
Determine that the method for voltage out-of-limit judges weak bus using the size of sensitivity index.This kind of method is true first
Certain sensitivity index fixed is as criterion, and calculates the corresponding Sensitirity va1ue of each load bus, then according to it is absolute
The size of value is ranked up, and the bus corresponding to maximum is exactly weak bus.
Then carry out reactive-load compensation adjustment voltage for voltage out-of-limit node, because reactive-load compensation is pacified to improving system electrical network
Entirely, stable operation play the role of important.Reactive power compensator lays how much optimal place and compensation dosage are, that is, should be through
Ji improves the voltage stability of system again to greatest extent, and the research of this respect is for power system important in inhibiting.?
Although installing reactive power compensator at all load buses safety can be greatly improved, it is apparent that being both uneconomical,
There is no need.Thus, some scholars propose application sensitivity index and lay place to determine reactive power compensator.Actual
On, with sensitivity index, this thought judges that weakness zone and the thought of weak bus play the same tune on different musical instruments.Those weak links are past
Past is exactly the first-selected place installing reactive power compensator.
Although sensitivity index can determine the position of reactive-load compensation, the quantity of reactive-load compensation mount point cannot be determined
And the size of compensation dosage.Sensitivity index is a state index, and it is only capable of the running status of reflection system certain point.Cause
And it is impossible to only determine the position of reactive-load compensation with sensitivity index, also need the dynamic characteristic of consideration system and non-linear, and
Combine with Practical Project, so that it is determined that the position of reactive-load compensation and size.
Present invention emulation case is only intended to help illustrate the present invention.It is all of thin that emulation case does not have detailed descriptionthe
Section, does not limit the specific embodiment that this invention is only described yet.Obviously, the content according to this specification, can make a lot of repairing
Change and change.This specification is chosen and is specifically described these embodiments, is to preferably explain the principle of the present invention and reality
Application, so that skilled artisan can utilize the present invention well.The present invention is only subject to claims and its complete
Portion's scope and the restriction of equivalent.
Claims (5)
1. a kind of power grid out-of-limit method of adjustment after extra-high voltage accesses it is characterised in that：Methods described comprises the steps：
S100：Set up the power system simulation model after 1000kV UHVAC transmission line accesses；
S200：Carry out static security analysis, obtain during normal condition or during N-1 malfunction, extra-high voltage access after in electrical network
Circuit heavy duty or overload situations；
S300：Carry out transient stability analysis, obtain analyzing the transient stability of electrical network；
S400：According to voltage range set in advance, carry out out-of-limit voltage node scanning；
To each out-of-limit voltage node, carry out following handling process：
S500：Calculate the sensitivity matrix of this out-of-limit voltage node；
S600：Relatively Sensitirity va1ue, determines and carries out reactive-load compensation；
S700：After reactive-load compensation, if still there being sub-load node voltage out-of-limit, adjustment on-load transformer tap changer no-load voltage ratio is entered
Row pressure regulation.
2. a kind of power grid out-of-limit method of adjustment after extra-high voltage accesses as claimed in claim 1 it is characterised in that：Described
In step S100, generator model is using the secondary transient state quadrature axis potential E with Damper Winding "q, d-axis potential E "dVariation model, and
Consider the effect of excitation, PSS and governing system, load model adopts 60% invariable power, 40% constant-impedance load model.Active,
The Null Frequency factor is 1.8, -2.0.
3. a kind of power grid out-of-limit method of adjustment after extra-high voltage accesses as claimed in claim 1 it is characterised in that：Institute
State in step S500, specifically：
A1：Variation delta U of calculated load node voltageDWith load bus reactive-load compensation Δ QDBetween sensitivity relation when,
ΔQDAs control variable；
When load bus increases reactive-load compensation it is assumed that generator reactive power exports constant, i.e. Δ QG=0
Formula (1) obtains through abbreviation：ΔUD=RDDΔQD(2)
RDDIt is Δ UDWith Δ QDBetween sensitivity matrix, its resistive dimension, it is by-B " in the inverse of a matrix after augmentation
The load bus part submatrix related to reactive-load compensation；
Derivation can obtain：
Wherein LDGAnd LGDFor the transadmittance between electromotor node and load bus, LGGFor the self-admittance of electromotor node, LDDFor
B″；
A2：Variation delta U of research load bus voltageDWith generator reactive power exporting change amount Δ QGBetween sensitivity
During relation, Δ QGAs control variable；
When generator reactive power exporting change it is assumed that load bus reactive-load compensation (or idle injection) is called 0, i.e. Δ QD=0
Then formula (1) can be deformed into：ΔUD=RDGΔQG(4)
RDGRepresent Δ UDWith Δ QGBetween sensitivity matrix, its meaning is by-B " invert after matrix augmentation, the generating in inverse matrix
The machine node part submatrix related with load bus；
Derivation can obtain：
A3：Variation delta U of calculated load node voltageDDuring sensitivity relation and transformer voltage ratio Δ t between, adjust adjustable
The tap of no-load voltage ratio transformator can change the voltage of load bus.It is assumed that transformer voltage ratio changes Δ t, if now electromotor is female
Line voltage is constant, and load bus is idle, and injection is also constant, then load bus voltage will change.By sensitivity relationThen there is Δ UD=TDtΔt
Wherein, TDtFor Δ UDSensitivity matrix and Δ t between
Derivation can obtain：
Wherein, LDDFor not comprising the imaginary part of the bus admittance matrix of PV node.
4. a kind of power grid out-of-limit method of adjustment after extra-high voltage accesses as claimed in claim 1 it is characterised in that：Described
In step S600, according to factor of merit order from small to large, find out out-of-limit voltage node factor of merit maximum, select maximum institute
Corresponding reactive-load compensation amount, carries out reactive-load compensation to the node participating in voltage-regulation.
5. a kind of power grid out-of-limit method of adjustment after extra-high voltage accesses as claimed in claim 1 it is characterised in that：Step
S300 further includes：
Consider the fault of most serious, be first provided with three phase short circuit fault on extra-high voltage 1000kV alternating current circuit, by PSD-BPA
Stability program is analyzing the impact to stability for the ultrahigh voltage alternating current transmission lines fault, then two near extra-high voltage drop point
500kV circuit is provided with three phase short circuit fault, the transient stability of analysis electrical network.
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