CN107516901B - Method for coordinating voltage control among 500kV transformer substations in automatic voltage control - Google Patents

Method for coordinating voltage control among 500kV transformer substations in automatic voltage control Download PDF

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CN107516901B
CN107516901B CN201710749934.9A CN201710749934A CN107516901B CN 107516901 B CN107516901 B CN 107516901B CN 201710749934 A CN201710749934 A CN 201710749934A CN 107516901 B CN107516901 B CN 107516901B
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voltage
substation
transformer
transformer substation
station
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CN107516901A (en
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胡亚平
周华锋
汤磊
胡荣
赵化时
聂涌泉
刘永锋
李小江
王志南
章平
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China Southern Power Grid Co Ltd
Beijing King Star Hi Tech System Control Co Ltd
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China Southern Power Grid Co Ltd
Beijing King Star Hi Tech System Control 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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

Abstract

The invention relates to a method for coordinating voltage control among 500kV transformer substations in automatic voltage control, and belongs to the technical field of automatic voltage control of power systems. When each control period T comes, calculating to obtain a sensitivity matrix of a power grid and a station coordination coefficient matrix; forming a corresponding 500kV transformer substation coordination group for each 500kV transformer substation participating in automatic voltage control in the power grid; and then, according to the voltage out-of-limit condition and the reactive resource condition of each transformer substation in the station coordination group, calculating and generating a station coordination voltage control strategy for assisting the transformer substation in regulating the voltage of other adjacent transformer substations. By adopting the method, the reactive equipment configured in the power grid can be fully utilized, the out-of-limit of the bus voltage in the power grid is eliminated, and the voltage stability and the voltage quality of the power grid are improved.

Description

Method for coordinating voltage control among 500kV transformer substations in automatic voltage control
Technical Field
The invention belongs to the technical field of automatic voltage control of electric power systems, and particularly relates to a method for controlling coordinated voltage among 500kV transformer substations in automatic voltage control.
Background
An Automatic Voltage Control (hereinafter referred to as AVC) system is an important means for achieving operation of power grid safety (improving Voltage stability margin), economy (reducing network loss) and high quality (improving Voltage qualification rate). The AVC system is constructed on a power grid Energy Management System (EMS), can scientifically decide an optimal reactive voltage regulation scheme from the perspective of global optimization of a power grid by utilizing real-time operation data of the power grid, and automatically issues the optimal reactive voltage regulation scheme to a power plant, a transformer substation and a subordinate power grid dispatching mechanism for execution. The AVC system continuously performs real-time optimization control of voltage in a closed-loop manner by taking voltage safety and high quality as constraints and taking system operation economy as a target, realizes a whole set of analysis, decision, control, reanalysis, decision and re-control of reactive voltage real-time tracking control problems of online generation, real-time issuing, closed-loop automatic control and the like of a reactive voltage coordination control scheme, can effectively overcome the defects of the traditional power grid reactive voltage control means, and improves the level of safe, stable and economical operation of a power grid.
The architecture of automatic voltage control of a large power grid is described in "global voltage optimization control system design based on soft partitioning" (power system automation, 2003, volume 27, paragraph 8, pages 16-20) by grand son, zhenberging and guo celebration. The method adopts a three-level automatic voltage control architecture based on soft partition to realize automatic voltage control of a large power grid. Wherein: the three-level control is global reactive power optimization calculation, various adjustable reactive power means are fully considered, and a bus voltage optimization control target of whole network coordination is given through optimal load flow calculation; the secondary control is the control strategy calculation of partition decoupling: automatically dividing the power grid into decoupled areas, selecting a plurality of central buses in each area, and calculating control strategies of various reactive resources in each area for each area so as to follow central bus optimization targets in the areas given by three-level control; the primary control is the local control of the station end and executes the voltage or reactive control instruction given by the AVC main station.
The master station part of the AVC system is an automatic voltage control method realized in a power grid control center based on software programs, and the voltage control method of the AVC system for the power grid mainly comprises a reactive power control method for a power plant generator and a reactive power equipment control method for a transformer substation, which are 2 types. The method for controlling the reactive power of the generator of the power plant mainly comprises the steps that after an AVC system of a dispatching center obtains reactive power regulating quantities of all units of the power plant through reactive power optimization calculation, the reactive power regulating quantities of the units are converted into control target values of the voltage of a high-voltage side bus of the power plant through reactive power voltage sensitivity, a main station sends voltage control target values of the high-voltage side bus of the power plant to an AVC substation system of the power plant through a data communication channel, after the AVC substation of the power plant receives the target values, the reactive power sent out by the generator is adjusted in a stepping mode according to the current running state of all generators in the power plant until the high-voltage side bus reaches set values sent by the AVC main station, and when the reactive power sent out by the. The control method for the transformer substation comprises a switching instruction for reactive compensation equipment and an adjusting instruction for an on-load voltage regulation tap of the transformer. The reactive equipment mainly comprises a capacitor and a reactor, and when the capacitor is put into or the reactor is cut off, the bus voltage is increased; when the capacitor is cut off or the reactor is put in, the bus voltage is lowered. The on-load voltage regulation tap of the transformer is generally mounted on a high-voltage side winding of the transformer, and when the tap gear is increased, the voltage of a medium-low voltage bus is increased, otherwise, the voltage is reduced. And the AVC master station issues an instruction for switching in or cutting off the reactive equipment and a tap lifting instruction, and an automatic monitoring system in the transformer substation completes switching of the reactive equipment or adjustment of the tap in the transformer substation according to the received instruction.
The automatic voltage control relates to the calculation of reactive voltage sensitivity, and the physical meaning of the reactive voltage sensitivity is that the voltage of each bus in the power grid changes after the reactive power of an injection unit is added on a certain bus. Grand bin, zhanberming, and yearly, proposed a quasi-steady-state sensitivity method in the quasi-steady-state sensitivity analysis method (the report of motor engineering in china, V19N4, 1999, 4 months, pp.9-13), which is different from the conventional static sensitivity analysis method, takes into account the quasi-steady-state physical response of the power system, and takes into account the total change between the new and old steady states before and after the system control, thereby effectively improving the accuracy of the sensitivity analysis. The method is based on a PQ decoupling model of a power system, and when a generator is provided with an Automatic Voltage Regulator (AVR), the generator node can be regarded as a PV node; when the generator is provided with automatic reactive power regulation (AQR) or Automatic Power Factor Regulation (APFR), the generator node is considered to be a PQ node, which is the same as a common load node. In addition, the load voltage static characteristic is considered as a primary or secondary curve of the node voltage. The established power flow model naturally takes these quasi-steady-state physical responses into account, so that the sensitivity calculated based on the power flow model is the quasi-steady-state sensitivity. The quasi-steady-state sensitivity method is adopted for calculating control strategies of power plants and transformer substations in the power grid AVC system.
The control of the 500kV transformer substation in the current automatic voltage control is to adopt a sensitivity algorithm to calculate the bus control target value of all transformer substations in the area according to the control value of the area central bus voltage given by the three-level optimization control. In the secondary voltage control of the transformer substation, the system needs to perform comprehensive analysis by combining a bus voltage control target given by the tertiary control according to the equipment operation condition of the transformer substation, predict the control result of the discrete equipment, determine whether the discrete equipment is controllable, generate a control strategy of specific equipment, and issue the control strategy to a comprehensive automation system of the transformer substation for execution. In the existing algorithm, coordination control between 500kV stations is not shown, namely when voltage in one station is out of limit and no controllable means exists, adjacent substations carry out assistance adjustment to eliminate the voltage out of limit.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for coordinating voltage control among 500kV transformer substations in automatic voltage control. The invention fully utilizes the reactive equipment configured in each transformer substation in the power grid, eliminates the out-of-limit of the bus voltage in the power grid, and improves the voltage stability and the voltage quality of the power grid.
The invention provides a method for coordinating voltage control among 500kV transformer substations in automatic voltage control, which is characterized by comprising the following steps of:
1) presetting a control period T of a power grid;
2) when each control period T comes, calculating to obtain a sensitivity matrix of the power grid and a station coordination coefficient matrix; the method comprises the following specific steps:
2-1) calculating and obtaining reactive voltage sensitivity S between high-voltage side buses of 500kV transformer substation based on load flow modelij，SijIndicating the variable quantity of the 500kV bus voltage of the jth substation corresponding to the unit reactive power injected on the 500kV bus of the ith substation; with the complete 500kV substation set S in the power grid500To obtain all SijAnd forming a sensitivity matrix expression of n x n order as follows:
Figure BDA0001390892740000031
wherein S iscvAs a sensitivity matrix, SijThe voltage sensitivity of a 500kV bus of a transformer substation i to a 500kV bus of a transformer substation j is shown, and n is the number of 500kV transformer substations in a power grid;
2-2) defining a station coordination coefficient XijThe following were used:
Figure BDA0001390892740000032
when i ═ j, Xij1 is ═ 1; the station coordination coefficient matrix is obtained as follows:
Figure BDA0001390892740000033
wherein, Xij≠XjiAnd has the following components:
0<Xij<1.0,0<Xji<1.0
3) forming a corresponding 500kV substation coordination group SG for any 500kV substation i participating in automatic voltage control in the power grid based on the substation coordination coefficient matrix obtained in the step 2)i(ii) a The method comprises the following specific steps:
defining the set of other transformer substations which are coordinated with the ith 500kV transformer substation as the station coordination of the ith 500kV transformer substationGroup adjusting SGiiThe expression is as follows:
SGi＝{Sj,Xij>Xm,j∈S500,j≠i}
wherein, XmIs a threshold parameter, 0<Xm<1.0；
4) For the station coordination group SG generated in the step 3)iForming a coordination voltage control strategy; the method comprises the following specific steps:
4-1) definition of the set T0Controlled 500kV substation set for maintaining station coordinated voltage control strategy for eliminating lower voltage limit, T1In order to save the set of the controlled 500kV transformer substation for eliminating the station coordination voltage control strategy with the voltage exceeding the upper limit, the two sets are respectively initialized to be empty;
4-2) for the transformer substation i, firstly, checking whether the bus voltage in the transformer substation is out of limit or not, and specifically, the method comprises the following steps:
4-2-1) if the voltage in the transformer substation i is greater than or less than the given voltage upper limit or lower limit, eliminating the voltage out-of-limit in the transformer substation, not participating in the station-to-station coordination voltage control of the transformer substation, returning to the step 3), and continuously calculating the station-to-station coordination voltage control strategy of the next transformer substation;
4-2-2) if the voltage in the transformer substation i is not out of limit, entering a step 4-3), and calculating a substation coordination voltage control strategy of the transformer substation i;
4-3) establishing a counter N for recording the number of the station coordination control demands0And N1Initial season N0＝N1＝0；
4-4) station coordination group SG for substation iiEach substation j in (1) performs the following steps:
4-4-1) if the 500kV bus voltage in the transformer substation j exceeds the upper limit, and no reducible reactive resources exist in the transformer substation j, and the T is integrated1If the transformer substation j is not included in the system, recording N1＝N1+1；
4-4-2) if the lower limit of the 500kV bus voltage in the transformer substation j is changed, no reactive resource can be added in the transformer substation j, and simultaneously, the T is integrated0In does not containSubstation j, then record N0＝N0+1；
4-5) station coordination group SG traversing substation iiAfter all substations in (1), the counter N is checked0、N1:
4-5-1) if N1>0 and N0If the voltage is 0, generating a reactive power reduction control strategy in the transformer substation i to reduce the 500kV bus voltage, recording the control strategy into a control strategy table, and making SGiAll substations j in (1) are stored into a medium set T1Performing the following steps;
4-5-2) if N0>0 and N1If the voltage is 0, generating a reactive power increasing control strategy in the transformer substation i to increase the 500kV bus voltage, recording the control strategy into a control strategy table, and making the SGiAll substations j in (1) are stored into a medium set T0Performing the following steps;
4-5-3) if N10 and N0If 0, substation i does not assist SGiPerforming voltage correction and regulation on other substations;
4-5-4) if N1>0 and N0>0, then, is stated in SGiA plurality of transformer substations needing to assist in correcting and regulating voltage are arranged, the voltage regulating directions of the transformer substations are different, and the transformer substation i cannot perform station coordination voltage control;
5) returning to the step 3) again, and continuing to calculate the station coordination voltage control strategy of the next transformer station until all the 500kV transformer stations in the power grid are processed;
6) and when the next control period T comes, returning to the step 2) again, and starting a new round of calculation of the station coordination voltage control strategy. The invention has the characteristics and beneficial effects that:
according to the invention, in the control of the transformer substation, for the transformer substation with close electrical connection, when the voltage of a certain station is out of limit and reactive resources in the station are used up, adjacent transformer substation reactive equipment is coordinately controlled, and the voltage out of limit is eliminated; in the original secondary voltage control method, the control is only carried out along with the target given by the tertiary voltage, and the coordination control is not carried out on the adjacent station of 500kV in a refined mode. The method can fully utilize reactive equipment configured in the power grid, and improve the voltage stability and the voltage quality of the power grid.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention.
Fig. 2 is a schematic diagram of a connection relationship between substations according to an embodiment of the present invention.
Detailed Description
The method for coordinating voltage control between 500kV substations in automatic voltage control according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are used for explaining the present invention, but are not intended to limit the present invention.
The method for coordinating the voltage control among the 500kV transformer substations in the automatic voltage control is characterized in that for the transformer substations which are closely connected electrically, in the secondary voltage control, when the voltage of a certain transformer substation exceeds the limit and reactive resources in the transformer substations are exhausted, adjacent transformer substation reactive equipment is coordinated and controlled to eliminate the voltage exceeding the limit; the general flow of the method is shown in fig. 1, and specifically comprises the following steps:
1) presetting a control period T (T is usually 5 minutes) of the power grid;
2) when each control period T comes, calculating to obtain a sensitivity matrix of the power grid and a station coordination coefficient matrix; the method comprises the following specific steps:
2-1) calculating and obtaining reactive voltage sensitivity S between high-voltage side buses of 500kV transformer substation based on load flow modelij，SijThe variation of the 500kV bus voltage of the jth substation corresponding to the unit reactive power injected into the 500kV bus of the ith substation is shown. With the complete 500kV substation set S in the power grid500To obtain all SijAnd forming a sensitivity matrix expression of n x n order as follows:
Figure BDA0001390892740000051
wherein ScvAs a sensitivity matrix, SijIs the voltage sensitivity of the 500kV bus of the transformer substation i to the 500kV bus of the transformer substation j, n is electricityAnd the number of 500kV transformer substations in the network.
2-2) defining a station coordination coefficient XijThe following were used:
Figure BDA0001390892740000052
when i ═ j, Xij1 is ═ 1; the station coordination coefficient matrix can thus be obtained as follows:
Figure BDA0001390892740000053
because the characteristics of electric wire netting structure, power supply layout, generally have: xij≠XjiAnd has the following components:
0<Xij<1.0,0<Xji<1.0
3) automatically forming a corresponding 500kV substation coordination group SG for any 500kV substation i participating in automatic voltage control in the power grid based on the substation coordination coefficient matrix obtained in the step 2)i(ii) a The method comprises the following specific steps:
defining the set of other transformer substations which are coordinated with the ith 500kV transformer substation as a station coordination group SG of the ith 500kV transformer substationiiThe expression is as follows:
SGi＝{Sj,Xij>Xm,j∈S500,j≠i}
wherein XmFor settable threshold parameters, 0<Xm<1.0, which represents how closely the electrical connections of the other substations with which substation i is coordinated are (larger values indicate closer connections).
4) For the station coordination group SG generated in the step 3)iForming a coordination voltage control strategy; the method comprises the following specific steps:
4-1) definition of the set T0Controlled 500kV substation set for maintaining station coordinated voltage control strategy for eliminating lower voltage limit, T1In order to save the set of the controlled 500kV transformer substation for eliminating the station coordination voltage control strategy with the voltage exceeding the upper limit, the two sets are respectively initialized to be empty;
4-2) for the transformer substation i, firstly, checking whether the bus voltage in the transformer substation is out of limit or not, and specifically, the method comprises the following steps:
4-2-1) eliminating the in-station voltage out-of-limit if the in-station voltage of the substation i is greater than or less than a given upper or lower voltage limit. And (3) when the voltage in the transformer substation is in the line crossing condition, the transformer substation cannot participate in the station-station coordination voltage control, returning to the step 3), and continuously calculating the station-station coordination voltage control strategy of the next transformer substation.
4-2-2) if the voltage in the transformer substation i is not out of limit, entering a step 4-3), and calculating a substation coordination voltage control strategy of the transformer substation i;
4-3) introducing a coordination requirement N when calculating a station coordination voltage control strategy of the transformer station i0、N1Variable recording station coordinates and controls the required quantity, initial time N0＝N1＝0；
4-4) station coordination group SG for substation iiEach substation j in (1) performs the following steps:
4-4-1) if the 500kV bus voltage in the transformer substation j exceeds the upper limit, and no reducible reactive resources (namely all capacitors on the low-voltage side are withdrawn and all reactors are put into use) exist in the transformer substation j, and the T sets are integrated1If the transformer substation j is not included in the system, recording N1＝N1+1；
4-4-2) if the lower limit of the 500kV bus voltage in the transformer substation j is changed, no reactive resource (namely all reactors on the low-voltage side are withdrawn and all capacitors are put into) can be added in the transformer substation j, and the set T is integrated0If the transformer substation j is not included in the system, recording N0＝N0+1；
4-5) station coordination group SG traversing substation iiAfter all substations in (1), the counter N is checked0、N1:
4-5-1) if N1>0 and N0If the voltage is 0, generating a reactive power reduction control strategy in the transformer substation i to reduce the 500kV bus voltage, recording the control strategy into a control strategy table, and making SGiAll substations j in (1) are stored into a medium set T1Performing the following steps;
4-5-2) if N0>0 and N1If the voltage is 0, generating a reactive power increasing control strategy in the transformer substation i to increase the 500kV bus voltage, recording the control strategy into a control strategy table, and making the SGiAll substations j in (1) are stored into a medium set T0Performing the following steps;
4-5-3) if N10 and N0If 0, substation i does not need assistance SGiPerforming voltage correction and regulation on other substations;
4-5-4) if N1>0 and N0>0, then, is indicated in the set SGiIn the transformer substation, a plurality of transformer substations needing to assist in correcting and regulating voltage are different in voltage regulating direction, and the transformer substation i cannot perform station voltage coordination control;
5) and returning to the step 3) again, and continuously calculating the station coordination voltage control strategy of the next substation i +1 until all the 500kV substations in the power grid are processed.
6) And when the next control period T comes, returning to the step 2) again, and starting a new round of station-to-station coordination voltage control strategy calculation.
The working principle of the method of the invention is as follows:
the method comprises the steps of carrying out quasi-steady-state sensitivity calculation on an existing provincial dispatching area model to obtain the sensitivity between current stations, automatically forming a 500kV station coordination group through a sensitivity relation, carrying out coordination strategy calculation on each coordination group, carrying out coordination control on adjacent substation reactive equipment, and eliminating voltage out-of-limit when reactive resources in the stations are used up.
Examples
In this embodiment, control calculation is performed on a provincial dispatching area, the station-to-station connection relationship in this embodiment is shown in fig. 2, and the subareas include 5 500kV transformer substations, which are A, B, C, D, E respectively; setting that the bus of the station E is higher than the upper limit, but the station has no regulating capability, the station A has no out-of-limit condition and also has regulating capability, and the station B, C, D has no out-of-limit condition and no regulating capability by default;
the invention provides a method for coordinating voltage control among 500kV transformer substations in automatic voltage control, which comprises the following steps:
1) presetting a control period T, wherein every 5 minutes is taken as a control period in the embodiment;
2) when each control period T comes, calculating to obtain a sensitivity matrix of the power grid and a station coordination coefficient matrix; the method comprises the following specific steps:
2-1) calculating and obtaining reactive voltage sensitivity S between high-voltage side buses of 500kV transformer substation based on load flow modelij，SijThe physical meaning is that unit reactive power is injected into a 500kV bus of an ith transformer substation, and the variation of the voltage of the 500kV bus of a corresponding jth transformer substation is obtained.
In this embodiment, S of each substationijThe values of (a) are shown in table 1:
table 1 reactive voltage sensitivity S of this exampleijValue-taking meter
Figure BDA0001390892740000071
Figure BDA0001390892740000081
Set S for all 500kV transformer substations in power grid500To obtain all SijAnd a 5 x 5 order sensitivity matrix is formed as follows:
Figure BDA0001390892740000082
wherein ScvAs a sensitivity matrix, SijThe sensitivity of the i transformer substation to the j transformer substation is shown, and n is the number of 500kV transformer substations in the power grid.
2-2) defining a station coordination coefficient XijThe following were used:
Figure BDA0001390892740000083
when i ═ j, Xij＝1；
The values of the station coordination coefficients in this embodiment are shown in table 2:
table 2 station coordination coefficient X in this embodimentijValue-taking meter
A B C D E
A 1.000 0.911 0.485 0.495 0.608
B 0.505 1.000 0.244 0.250 0.306
C 0.433 0.393 1.000 0.454 0.561
D 0.451 0.411 0.467 1.000 0.596
E 0.754 0.682 0.780 0.809 1.000
The station coordination coefficient matrix can thus be obtained as follows:
Figure BDA0001390892740000084
because the characteristics of electric wire netting structure, power supply layout, generally have: xij≠XjiAnd has the following components:
0<Xij<1.0,0<Xji<1.0
3) automatically forming a corresponding 500kV substation coordination group SG for any 500kV substation i participating in automatic voltage control in the power grid based on the substation coordination coefficient matrix obtained in the step 2)i(ii) a The method comprises the following specific steps:
defining the set of other transformer substations which are coordinated with the ith 500kV transformer substation as a station coordination group SG of the ith 500kV transformer substationiSetting Xm0.5, then the station coordination set that can be determined is as follows:
Figure BDA0001390892740000091
wherein XmFor settable threshold parameters, 0<Xm<1.0, which represents how closely the electrical connections of the other substations in coordination with substation i are.
4) For the station coordination group SG generated in the step 3)iForming a coordination voltage control strategy, which comprises the following specific steps:
4-1) definition of the set T0Controlled 500kV substation set for maintaining station coordinated voltage control strategy for eliminating lower voltage limit, T1In order to save the set of the controlled 500kV transformer substation for eliminating the station coordination voltage control strategy with the voltage exceeding the upper limit, the two sets are respectively initialized to be empty;
4-2) for the transformer substation i, firstly, checking whether the bus voltage in the transformer substation is out of limit:
4-2) for the transformer substation i, firstly, checking whether the bus voltage in the transformer substation is out of limit or not, and specifically, the method comprises the following steps:
4-2-1) if the voltage in the transformer substation i is greater than or less than the given upper voltage limit or lower voltage limit, eliminating the out-of-limit voltage in the transformer substation, and the transformer substation does not participate in the coordinated voltage control of the transformer substation, and 3) again;
4-2-2) if the voltage in the transformer substation i is not out of limit, entering a step 4-3), and calculating a substation coordination voltage control strategy of the transformer substation i;
in this embodiment, taking the current transformer substation a as an example, if no bus voltage in the substation exceeds the limit, the step 4-3) is performed;
4-3) when a station-station coordination voltage control strategy of the substation A is calculated, introducing N0 and N1 variables to record the station-station coordination control requirement, and initially, N0 is equal to N1 is equal to 0;
4-4) station coordination group SG for substation AAEach substation of (1) performing the steps of:
the lower limit of the 500kV bus voltage in the transformer substation B is not exceeded, and no calculation is performed; the upper limit of a bus in a substation E is higher, the substation A has regulating capacity, the upper limit of the 500kV bus voltage in the substation E is higher, no reducible reactive resource exists in the substation E (namely all capacitors on the low-voltage side are withdrawn and all reactors are put into), meanwhile, the substation E is not contained in a set T1, and the record N1 is N1+ 1;
4-5) station coordination group SG of substation AAAfter all the substations in (1) are processed, the counter N is checked0、N1:
N1>0 and N0If the voltage is 0, generating a reactive power reduction control strategy in the transformer substation A to reduce the 500kV bus voltage, and converting SG intoAAll substations in (A) are stored in (B) medium set T1Performing the following steps;
5) and returning to the step 3), continuously calculating the station coordination voltage control strategy of the coordination group generated by the next transformer substation until all the 500kV transformer substations are processed.
6) And when the next control period T comes, returning to the step 2) again, and starting the calculation of the coordination voltage control strategy of a new station.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.

Claims (1)

1. A method for coordinating voltage control among 500kV transformer substations in automatic voltage control is characterized by comprising the following steps:
1) presetting a control period T of a power grid;
2) when each control period T comes, calculating to obtain a sensitivity matrix of the power grid and a station coordination coefficient matrix; the method comprises the following specific steps:
2-1) calculating and obtaining reactive voltage sensitivity S between high-voltage side buses of 500kV transformer substation based on load flow modelij，SijIndicating the variable quantity of the 500kV bus voltage of the jth substation corresponding to the unit reactive power injected on the 500kV bus of the ith substation; with the complete 500kV substation set S in the power grid500To obtain all SijAnd forming a sensitivity matrix expression of n x n order as follows:
Figure FDA0002305414590000011
wherein S iscvThe number of the transformer substations is 500kV in the power grid;
2-2) defining a station coordination coefficient XijThe following were used:
Figure FDA0002305414590000012
when i ═ j, Xij1 is ═ 1; the station coordination coefficient matrix is obtained as follows:
Figure FDA0002305414590000013
wherein, Xij≠XjiAnd has the following components:
0<Xij<1.0,0<Xji<1.0
3) forming a corresponding 500kV substation coordination group SG for any 500kV substation i participating in automatic voltage control in the power grid based on the substation coordination coefficient matrix obtained in the step 2)i(ii) a The method comprises the following specific steps:
defining the set of other transformer substations which are coordinated with the ith 500kV transformer substation as a station coordination group SG of the ith 500kV transformer substationiThe expression is as follows:
SGi＝{Sj,Xij>Xm,j∈S500,j≠i}
wherein, XmIs a threshold parameter, 0<Xm<1.0；
4) For the station coordination group SG generated in the step 3)iForming a coordination voltage control strategy; the method comprises the following specific steps:
4-1) definition of the set T0Controlled 500kV substation set for maintaining station coordinated voltage control strategy for eliminating lower voltage limit, T1Station for keeping the upper limit of the eliminating voltageA set of controlled 500kV transformer substations of a station coordination voltage control strategy, wherein the two sets are respectively initialized to be empty;
4-2) for the transformer substation i, firstly, checking whether the bus voltage in the transformer substation is out of limit or not, and specifically, the method comprises the following steps:
4-2-1) if the voltage in the transformer substation i is greater than or less than the given voltage upper limit or lower limit, eliminating the voltage out-of-limit in the transformer substation, not participating in the station-to-station coordination voltage control of the transformer substation, returning to the step 3), and continuously calculating the station-to-station coordination voltage control strategy of the next transformer substation;
4-2-2) if the voltage in the transformer substation i is not out of limit, entering a step 4-3), and calculating a substation coordination voltage control strategy of the transformer substation i;
4-3) establishing a counter N for recording the number of the station coordination control demands0And N1Initial season N0＝N1＝0；
4-4) station coordination group SG for substation iiEach substation j in (1) performs the following steps:
4-4-1) if the 500kV bus voltage in the transformer substation j exceeds the upper limit, and no reducible reactive resources exist in the transformer substation j, and the T is integrated1If the transformer substation j is not included in the system, recording N1＝N1+1；
4-4-2) if the lower limit of the 500kV bus voltage in the transformer substation j is changed, no reactive resource can be added in the transformer substation j, and simultaneously, the T is integrated0If the transformer substation j is not included in the system, recording N0＝N0+1；
4-5) station coordination group SG traversing substation iiAfter all substations in (1), the counter N is checked0、N1:
4-5-1) if N1>0 and N0If the voltage is 0, generating a reactive power reduction control strategy in the transformer substation i to reduce the 500kV bus voltage, recording the control strategy into a control strategy table, and making SGiAll substations j in (a) are stored in the set T1Performing the following steps;
4-5-2) if N0>0 and N1If the value is 0, generating a reactive power increase control strategy of 500k in the transformer substation iV bus voltage, recording the control strategy in a control strategy table, and SGiAll substations j in (a) are stored in the set T0Performing the following steps;
4-5-3) if N10 and N0If 0, substation i does not assist SGiPerforming voltage correction and regulation on other substations;
4-5-4) if N1>0 and N0>0, then, is stated in SGiA plurality of transformer substations needing to assist in correcting and regulating voltage are arranged, the voltage regulating directions of the transformer substations are different, and the transformer substation i cannot perform station coordination voltage control;
5) returning to the step 3) again, and continuing to calculate the station coordination voltage control strategy of the next transformer station until all the 500kV transformer stations in the power grid are processed;
6) and when the next control period T comes, returning to the step 2) again, and starting a new round of calculation of the station coordination voltage control strategy.
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