CN106159957B - A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures - Google Patents

A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures Download PDF

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CN106159957B
CN106159957B CN201510164350.6A CN201510164350A CN106159957B CN 106159957 B CN106159957 B CN 106159957B CN 201510164350 A CN201510164350 A CN 201510164350A CN 106159957 B CN106159957 B CN 106159957B
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voltage
critical busses
weak
facts
increasing degree
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CN106159957A (en
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曾兵
刘明松
张健
屠竞哲
易俊
贺庆
马士聪
王歆
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The present invention relates to a kind of optimization methods for exchanging weak section steady-state overvoltage Pre-control measures, including determine and exchange weak section critical busses i voltage increasing degree Δ Vi1;Compare the critical busses i voltage increasing degree Δ Vi1Allow voltage change Δ V with critical bussesim;As Δ Vi1> Δ Vim, determine and exchange weak section critical busses i voltage increasing degree Δ Vi2;As Δ Vi1< Δ Vim, keep existing Pre-control measures;Compare the critical busses i voltage increasing degree Δ Vi2Allow voltage change Δ V with the critical busses iim;As Δ Vi2> Δ Vim, determine and exchange weak section critical busses i voltage increasing degree Δ Vi3;As Δ Vi2< Δ Vim, optimization peace, which is controlled, cuts machine amount;Compare the critical busses i voltage increasing degree Δ Vi3Allow voltage change Δ V with the critical busses iim;As Δ Vi3> Δ Vim, pre-control critical busses i initial voltage is no more than Vim‑ΔVi3;As Δ Vi3< Δ Vim, optimize and revise FACTS device original state.Technical solution of the present invention increases the running space of actual electric network, and appropriate reduction peace control cuts machine amount, increases substantially the working efficiency of operations staff.

Description

A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures
Technical field:
The present invention relates to operation and control of electric power system fields, are more particularly to a kind of weak section steady-state overvoltage of exchange The optimization method of Pre-control measures.
Background technique:
With the fast development of China's extra-high voltage direct-current, a plurality of world's voltage class such as Central China Power Grid gives again, bright and beautiful Soviet Union, guest's gold A large amount of clean electric powers are sent to distant place load center by highest ± 800kV extra-high voltage direct-current engineering, and the following Northwest Grid also will Planning construction Ningxia Ling Zhou-ShaoXing,ZheJiang, Jiuquan-Hengyang, Hunan Province, the more times extra-high straightenings such as Hai Miao-Shandong Linyi on Ningxia Stream sends engineering outside.However, complicated with AC system reciprocation, extra-high voltage direct-current is thrown since extra-high voltage direct-current transmission capacity is big Fortune, which produces the operation characteristic of interconnected network, to be seriously affected.Especially exist in extra-high voltage direct-current sending and exchanges weak section In the case where, it is shifted by the extensive power of extra-high voltage direct-current locking failure bring, may cause part and exchange weak section tide It flows back to and moves back, near region bus is caused steady-state overvoltage problem occur.
The method that scheduling uses at present is to cut off unit according to the unbalanced power amount that power grid allows, and method of operation personnel are logical It crosses a large amount of off-line simulations and calculates the pre- control value of voltage for providing each critical busses of section, it is then close by adjusting by management and running personnel Area's generator voltage and reactive power compensator control critical busses voltage in safe range, and current method does not account for Machine measure is cut to peace control for system different running method and exchange weak section FACTS device dynamic reactive spare capacity into Row optimization, it is big that machine amount is cut in peace control, high to Operating Voltage level requirement, is unfavorable for dispatcher's practical operation.
Summary of the invention:
The object of the present invention is to provide a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures, synthesis is examined Consider system operation mode, peace control measure and FACTS device dynamic response, the running space of actual electric network can be increased, it is appropriate to reduce Machine amount is cut in peace control, and increases substantially the working efficiency of operations staff.
To achieve the above object, the invention adopts the following technical scheme: a kind of exchange weakness section steady-state overvoltage pre-control The optimization method of measure, comprising:
It determines and exchanges weak section critical busses i voltage increasing degree Δ Vi1
Compare the critical busses i voltage increasing degree Δ Vi1Allow voltage change Δ V with critical bussesim
As Δ Vi1> Δ Vim, determine and exchange weak section critical busses i voltage increasing degree Δ Vi2;As Δ Vi1< Δ Vim, protect Hold existing Pre-control measures;
Compare the critical busses i voltage increasing degree Δ Vi2Allow voltage change Δ V with the critical busses iim
As Δ Vi2> Δ Vim, determine and exchange weak section critical busses i voltage increasing degree Δ Vi3;As Δ Vi2< Δ Vim, excellent Change peace control and cuts machine amount;
Compare the critical busses i voltage increasing degree Δ Vi3Allow voltage change Δ V with the critical busses iim
As Δ Vi3> Δ Vim, pre-control critical busses i initial voltage is no more than Vim-ΔVi3;As Δ Vi3< Δ Vim, optimization tune Whole FACTS device original state.
A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, in the step: It determines and exchanges weak section critical busses i voltage increasing degree Δ Vi1Before further include:
Determine that exchange weakness section critical busses i allows voltage change Δ Vim, constraint failure and its peace control cut machine range, FACTS device original state and FACTS device whole dynamic reactive spare capacity.
A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, according to the constraint Failure, minimum peace control cut machine amount and FACTS device original state calculates and exchanges weak section critical busses voltage increasing degree Δ Vi1
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, root Machine amount is cut according to the constraint failure, maximum peace control and FACTS device original state calculates and exchanges weak section critical busses i electricity Press increasing degree Δ Vi2
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, root Machine amount is cut according to the constraint failure, maximum peace control and the calculating exchange of FACTS device whole dynamic reactive spare capacity is weak disconnected Face critical busses i voltage increasing degree Δ Vi3
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, institute Stating exchange weakness section critical busses i allows voltage change Δ Vim=Vim-Vi0Δ v, i=1,2 ... n;
Wherein, VimFor the long-term running upper voltage limit of power equipment in power grid, Vi0Electricity is operated normally for power grid median generatrix The upper limit is pressed, Δ v is that voltage calculates nargin, and n is the critical busses number for exchanging weak section.
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, institute Existing Pre-control measures are stated to keep the FACTS device original state constant and minimum peace control being taken to cut machine amount.
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, institute State the process that machine amount is cut in optimization peace control are as follows: keep the FACTS device original state constant, peace control is constantly adjusted using dichotomy Machine amount is cut, acquisition meets Δ Vi2=Δ VimPeace control cut machine amount optimal value.
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, institute State the process for optimizing and revising FACTS device original state are as follows:
It determines and works as Δ Vi2> Δ VimCritical busses i, i=1,2 ... m;
Calculate sensitivity of the idle variation of all FACTS devices to critical busses i voltage change;
It is electric no more than allowing with critical busses i voltage increasing degree with all minimum objective functions of FACTS device pondage Press changing value Δ VimFor constraint condition, linear programming model is established;
Solve FACTS device original state optimizes and revises result.
Another preferred a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures provided by the invention, leads to Throwing is crossed to move back near region secondary capacitor and adjust critical busses initial voltage value described near region generator terminal voltage pre-control;
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, there are the extra-high voltage direct-current sending ends of FACTS device suitable for exchanging weak section for technical solution provided by the invention System;
2, technical solution provided by the invention has fully considered that system operation mode, peace control cut machine measure and FACTS dress The dynamic response characteristic set influences, and proposes flexible optimization pre-control strategy;
3, technical solution provided by the invention reduces the limitation to Operating Voltage, can exchange weakness after solution accident The steady-state overvoltage problem of section bus;
4, technical solution provided by the invention, which reduces extra-high voltage direct-current and puts into operation, produces the operation characteristic of interconnected network It seriously affects.
Detailed description of the invention
Fig. 1 is the optimization method process for the weak section steady-state overvoltage Pre-control measures of exchange that technical solution of the present invention provides Figure;
Fig. 2 is northwest-Xinjiang networking second channel rack schematic diagram that technical solution of the present invention provides.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
The technical solution that the invention of this example provides is a kind of optimization side for exchanging weak section steady-state overvoltage Pre-control measures Method, Fig. 2 are the flow charts of present implementation, and specific steps include:
Step (1): determine that exchange weakness section critical busses i allows voltage change Δ Vim, constraint failure and its peace control Cut machine range, FACTS device original state and its whole dynamic reactive spare capacities;
It is northwest-Xinjiang networking second channel that weak section is exchanged in the present embodiment, chooses close according to the actual operation Key bus is respectively Jiuquan, the west of a river, fish card bus, exchanges the critical busses number n=3 of weak section, and critical busses allow electricity Press changing value Δ Vim=Vim-Vi0Δ v=28kV, i=1,2 ... n, i=1,2 ... n;Wherein, VimPower equipment in power grid is taken to permit Perhaps the upper voltage limit run is 820kV, Vi0It is 790kV for the power grid median generatrix normal operating voltage upper limit, Δ v is voltage calculating Nargin generally takes 2kV;
Constraint failure is to cause to exchange the direct current locking failure that weak section tidal current retracts most, passes through machine in the present embodiment Each direct current of electric transient emulation scanning Northwest Grid is latched failure, and simulation result shows that Ling Zhou-Shaoxing DC bipolar block failure is led It causes to exchange weak section tidal current rollback at most;
It includes that minimum peace control cuts machine amount and machine amount is cut in maximum peace control that machine range is cut in peace control, and it is certain that machine amount is cut in the minimum peace control Occur after constraint failure under one method of operation to guarantee to cut machine amount needed for power system stability, the spirit direct current that continues is double in the present embodiment It is 3000MW that machine amount is cut in locking failure minimum peace control in pole;Maximum peace control cuts machine amount and is generally the unbalanced power for considering that power grid allows Amount, direct current system actual disposition cuts machine amount, and the spirit DC bipolar block failure maximum peace control that continues cuts machine amount and is in the present embodiment 5500MW。
FACTS device original state is the capacitive reactive power capacity that FACTS device is actually initially put into, and FACTS device is whole Dynamic reactive spare capacity is the difference that FACTS device allows initial investment with the practical capacitive reactive power capacity initially put into.This FACTS device original state and dynamic reactive spare capacity are as shown in table 1 on northwest-Xinjiang two channels of networking in embodiment.
Table 1FACTS installed capacity and initial setting up situation (capacitive reactive power is positive)
Step (2): machine amount is cut according to constraint failure, minimum peace control and FACTS device original state calculates exchange weakness Section critical busses voltage increasing degree Δ Vi1, by critical busses i voltage increasing degree Δ Vi1Allow voltage change Δ V with critical bussesim It is compared;Power grid is obtained under FACTS device original state by Summary of Power System Simulation Software in the present embodiment Occur Ling Zhou-Shaoxing extra-high voltage direct-current bipolar locking failure and according to minimum peace control cut machine amount 3000MW execution cut exchange after machine it is thin Weak section critical busses voltage increasing degree Δ Vi1As shown in table 2;
Table 2 takes steps to exchange weak section critical busses voltage increasing degree after 2
Critical busses serial number i Critical busses title Initial voltage Steady state voltage Voltage increasing degree Δ Vi1
1 Jiuquan 780.5 816 35.5
2 The west of a river 770.3 798.7 28.4
3 Fish card 777.7 833.3 55.6
Due to Δ V11> Δ V1m, Δ V31> Δ V3m, execute step (3);
Step (3): machine amount is cut according to constraint failure, maximum peace control and FACTS device original state calculates exchange weakness Section critical busses voltage increasing degree Δ Vi2, by critical busses i voltage increasing degree Δ Vi2Allow voltage change Δ V with critical bussesim It is compared;Power grid is obtained under FACTS device original state by Summary of Power System Simulation Software in the present embodiment Occur Ling Zhou-Shaoxing extra-high voltage direct-current bipolar locking failure and according to maximum peace control cut machine amount 5500MW execution cut exchange after machine it is thin Weak section critical busses voltage increasing degree Δ Vi2As shown in table 3;
Table 3 takes steps to exchange weak section critical busses voltage increasing degree after 2
Critical busses serial number i Critical busses title Initial voltage Steady state voltage Voltage increasing degree Δ Vi1
1 Jiuquan 780.5 803.8 23.3
2 The west of a river 770.3 789.5 19.2
3 Fish card 777.7 811.5 33.8
Due to Δ V32> Δ V3m, execute step (4);
Step (4): machine amount and FACTS device whole dynamic reactive spare capacity are cut according to constraint failure, maximum peace control It calculates and exchanges weak section critical busses voltage increasing degree Δ Vi3, by critical busses i voltage increasing degree Δ Vi3Allow electricity with critical busses Press changing value Δ VimIt is compared;Power grid is obtained by Summary of Power System Simulation Software in the present embodiment to fill in FACTS Ling Zhou-Shaoxing extra-high voltage direct-current bipolar locking failure occurs after setting the whole dynamic reactive spare capacities of calling and according to maximum peace control It cuts machine amount 5500MW execution and cuts critical busses voltage increasing degree Δ V after machinei3As shown in table 4;
Table 4 takes steps to exchange weak section critical busses voltage increasing degree after 3
Critical busses serial number i Critical busses title Initial voltage Steady state voltage Voltage increasing degree Δ Vi1
1 Jiuquan 780.5 799.1 18.6
2 The west of a river 770.3 787.5 17.2
3 Fish card 777.7 798.3 20.6
Because of Δ Vi3< Δ Vim, need to optimize and revise FACTS device original state in next step;
Optimize and revise FACTS device original state method particularly includes:
1)ΔV32=33.8kV, Δ V3m=28kV considers Δ V32> Δ V2m, critical busses are fish card bus;
2) sensitivity that the idle variation of all FACTS devices changes fish card busbar voltage, Dunhuang in the present embodiment are calculated The controllable highly resistance of bus, the controllable highly resistance of fish card bus and shoal SVC it is idle variation to fish card busbar voltage variation be respectively 0.024, 0.074,0.031V/Mvar;
3) with all minimum objective functions of FACTS device pondage, fish card busbar voltage after being adjusted with FACTS device Increasing degree is no more than Δ VimFor constraint condition, A, B, C are respectively the controllable highly resistance of Dunhuang bus, the controllable highly resistance of fish card bus and shoal The dynamic reactive spare capacity that SVC is called, establishes linear programming model:
Objective function: min (A+B+C)
Constraint condition:
4) solve FACTS device original state optimizes and revises result A=0Mvar, B=80Mvar, C=0Mvar, adjustment Critical busses voltage increasing degree is as shown in table 5 afterwards, meets Δ Vi3< Δ Vim
Table 5 takes steps to exchange weak section critical busses voltage increasing degree after 3
Critical busses serial number i Critical busses title Initial voltage Steady state voltage Voltage increasing degree Δ Vi1
1 Jiuquan 780.5 802.9 22.4
2 The west of a river 770.3 789.0 18.7
3 Fish card 777.7 805.6 27.9
In conclusion fish card busbar voltage increasing degree is no more than 28kV to guarantee that spirit continues after DC bipolar block, machine need to be cut 5500MW, while adjusting the controllable highly resistance original state of fish card bus is -200Mvar (capacitive reactive power is positive).
The present embodiment is applied to spirit and continues DC bipolar block failure, while being suitable for Northwest Grid other may cause west The DC line that north-Xinjiang two channel trends of networking retract is latched failure.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen Within claims of the invention that please be pending.

Claims (3)

1. a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures, it is characterised in that: including
It determines and exchanges weak section critical busses i voltage increasing degree Δ Vi1
Compare the critical busses i voltage increasing degree Δ Vi1Allow voltage change Δ V with critical bussesim
As Δ Vi1> Δ Vim, determine and exchange weak section critical busses i voltage increasing degree Δ Vi2;As Δ Vi1<ΔVim, keep existing Pre-control measures;
Compare the critical busses i voltage increasing degree Δ Vi2Allow voltage change Δ V with the critical busses iim
As Δ Vi2> Δ Vim, determine and exchange weak section critical busses i voltage increasing degree Δ Vi3;As Δ Vi2<ΔVim, optimization peace control Cut machine amount;
Compare the critical busses i voltage increasing degree Δ Vi3Allow voltage change Δ V with the critical busses iim
As Δ Vi3> Δ Vim, pre-control critical busses i initial voltage is no more than Vim-ΔVi3;As Δ Vi3<ΔVim, optimize and revise FACTS device original state;
Wherein, VimFor the long-term running upper voltage limit of power equipment in power grid, i is critical busses serial number, i=1,2 ..n;
In step: determining and exchange weak section critical busses i voltage increasing degree Δ Vi1Before further include: it determines and exchanges weak section key Bus i allows voltage change Δ Vim, constraint failure and its peace control cut machine range, FACTS device original state and FACTS device Whole dynamic reactive spare capacities;
Machine amount is cut according to the constraint failure, minimum peace control and the weak section of FACTS device original state calculating exchange is crucial Busbar voltage increasing degree Δ Vi1
Machine amount is cut according to the constraint failure, maximum peace control and the weak section of FACTS device original state calculating exchange is crucial Bus i voltage increasing degree Δ Vi2
According to the constraint failure, machine amount is cut in maximum peace control and FACTS device whole dynamic reactive spare capacity calculates exchange Weak section critical busses i voltage increasing degree Δ Vi3
The existing Pre-control measures are to keep the FACTS device original state constant and minimum peace control is taken to cut machine amount;
The process of machine amount is cut in the optimization peace control are as follows: is kept the FACTS device original state constant, is constantly adjusted using dichotomy Machine amount is cut in whole peace control, and acquisition meets Δ Vi2=Δ VimPeace control cut machine amount optimal value;
The process for optimizing and revising FACTS device original state are as follows:
It determines and works as Δ Vi2> Δ VimCritical busses i, i=1,2 ... n;
Calculate sensitivity of the idle variation of all FACTS devices to critical busses i voltage change;
With all minimum objective functions of FACTS device pondage, become with critical busses i voltage increasing degree no more than permission voltage Change value Δ VimFor constraint condition, linear programming model is established;
Solve FACTS device original state optimizes and revises result.
2. a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures as described in claim 1, feature exist In: the exchange weakness section critical busses i allows voltage change Δ Vim=Vim-Vi0Δ v, i=1,2 ... n;
Wherein, VimFor the long-term running upper voltage limit of power equipment in power grid, Vi0For on power grid median generatrix normal operating voltage Limit, Δ v are that voltage calculates nargin, and n is the critical busses number for exchanging weak section.
3. a kind of optimization method for exchanging weak section steady-state overvoltage Pre-control measures as described in claim 1, feature exist In: critical busses initial voltage value described near region secondary capacitor and adjusting near region generator terminal voltage pre-control is moved back by throwing.
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CN108387819B (en) * 2018-01-26 2021-02-09 全球能源互联网研究院有限公司 Method and equipment for positioning overvoltage interval along AC transmission line
CN109713688B (en) * 2019-03-08 2021-06-22 山东大学 Large power grid static voltage stabilization online prevention control method and system
CN111371123B (en) * 2020-03-26 2021-06-18 国电南瑞科技股份有限公司 Cutter switching strategy optimization method and device for multi-type power supply collection direct current delivery system

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CN103701146A (en) * 2014-01-07 2014-04-02 国家电网公司 Method for improving direct current transmission capacity of direct current fault steady-state voltage constraint
CN104201691A (en) * 2014-08-06 2014-12-10 国网上海市电力公司 Method and system for controlling reactive power optimization

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