CN105207224B - SVC and capacitor, the idle displacement control method of reactor - Google Patents

Abstract

The present invention relates to a kind of SVC and capacitor, the idle displacement control method of reactor, belong to electric power automatism voltage control technical field.The method first calculates the Reactive Power Margin of SVC, when the Reactive Power Margin of any one SVC is unsatisfactory for the threshold of formulation, into the idle coordination strategy generation between SVC, if the strategy of generation is by verification, all of SVC regulated quantitys are unsatisfactory for respective minimum idle condition step-length, then triggering SVC and electric capacity, the idle displacement of reactor, if voltage conditions allow first to adjust SVC in transformer station, then after SVC regulations, next periodic Control can produce the tactful switched capacitor in opposite Reactive-power control direction, reactor, so as to complete the displacement of static reactive and dynamic reactive；If voltage-regulation is not allowed, then according to opposite regulation direction generation switched capacitor, the idle Replacement Strategy of reactor, to increase or decrease busbar voltage so that busbar voltage possesses enough margins of safety, then SVC is adjusted again idle, so as to complete the displacement of static reactive and dynamic reactive.

Description

SVC and capacitor, the idle displacement control method of reactor

Technical field

The present invention relates to a kind of SVC and capacitor, the idle displacement control method of reactor, belong to electricity Force system automatism voltage control field.

Background technology

Automatism voltage control (Automatic Voltage Control, hereinafter referred to as AVC) has become modern electric system The indispensable part of system scheduling, AVC is by coordinating various control devices (generator, capacitor, reactor, transformer The devices such as tap, SVC (abbreviation SVC), static reacance generator), control the reasonable nothing of each voltage class Work(flows, and reduces grid loss, improves Network Voltage Stability.

Tertiary voltage control based on soft sectoring turns into the main flow control model of country AVC, one of them important link It is exactly the idle control of transformer station.Common equipment in transformer station includes capacitor, reactor, many documents and patent for Transformer station's inner capacitor, the coordination control of reactor are studied and analyze, and are mainly segmented into two kinds：One kind is traditional 9th area Figure, the mode of 17 area's figures；Another kind is the strategy based on Expert Rules storehouse.From the point of view of applicable cases, the former is more as local The tactful foundation of control, the latter is the superset of the former control strategy, controls more fine, tactful more flexible, general effect More preferably.Guo Qing comes, Sun Hongbin et al. exists《(the coordination approach of continuous variable and discrete variable in automatism voltage control in transformer station (1) voltage control is coordinated in transformer station》Power transformation is elaborated in (Automation of Electric Systems, in August, 2008 V32N8, pp39-42) To stand completed using expert control strategy and coordinate the strategy of control.

There is stronger Reactive-power control ability and faster Reactive-power control speed in the transformer station for configuring SVC, and SVC is certain In the range of can be what is continuously adjusted, and based on the semiconductors such as IGCT control, possess dynamic reactive responding ability quickly. Power network receives disturbance or electric network reactive-load demand when quickly changing, being capable of quick regulation, it is ensured that Reactive Power Balance, so as to improve Voltage stabilization.If control mode is improper, easily causes SVC and stick limit or lower limit operation, Reactive-power control ability is weakened significantly, Cannot interdependent system fasting conditions reactive requirement.How transformer station in SVC and electric capacity, reactor, the nothing that keeps SVC higher are coordinated Work(adjusts nargin, and the dynamic reactive displacement of capacitor, the static reactive of reactor and SVC is carried out under triggering under suitable condition Be one highly significant with value problem.Here coordination and SVC in appropriate condition, including station between SVC with Electric capacity, reactor coordinate opportunity；In the case of there are many SVC, the Reactive Power Margin deficiency of separate unit SVC is not due between SVC Coordination is improper to be caused, and should just trigger SVC and capacitor, the idle displacement of reactor, therefore so-called SVC and capacitor, reactance The link that the idle method of replacing of device is critically important is exactly trigger condition.

Wang Xuran, Guo Qing et al. have studied the idle Replacement Strategy of SVC and power plant in automatism voltage control, bis- grades of AVC During control by the way of the two-stage controls, first balance it is idle, after realize the idle displacement of SVC and power generator, on SVC With the control strategy of power plant referring to《Consider the secondary voltage control of quick dynamic passive compensation》(Automation of Electric Systems, 2015 The 2nd phase of volume 39 year), but provide electric capacity of the SVC with discrete control device, reactor in this article.

In current automatism voltage control application, SVC and electric capacity, the idle replacement proble of reactor are not yet solved well, Although existing control strategy can be avoided irrational reactive circular power flow, but cause the dynamic reactive nargin of SVC too low.

The content of the invention

The purpose of the present invention aims to solve the problem that the deficiencies in the prior art, proposes a kind of SVC and capacitor, electricity The idle displacement control method of anti-device, realizes the displacement of static reactive and dynamic reactive, so as to ensure the enough Reactive Power Margins of SVC With the fast reactive regulatory demand of responsive electricity grid, voltage stability is improved.

SVC and capacitor, the idle method of replacing of reactor in transformer station proposed by the present invention, including Following steps：

1) total number of SVC in transformer station is designated as N, i-th the current idle of SVC is designated as Q_Di, idle Upper-lower Limit value It is designated as respectivelyReactive-power control amount is designated as Δ Q_Di, the idle operating point of exerting oneself of acquiescence for presetting SVC is designated asTakeIf minimum, maximal regulated step-length is designated as successively SVC without Work(nargin threshold value is designated asEngineer applied can typically take

2) the Reactive Power Margin index of i-th SVC after adding Reactive-power control amount is setIfThen it is transferred to 3), does not enter line replacement control otherwise, terminates；

3) the following quadratic programming model being made up of optimization aim and constraints is solved, the Reactive-power control amount of SVC is obtained, (for convenience) each amount uses vector representation below, and optimization aim is that the Reactive Power Margin index quadratic sum of all SVC is minimum (i.e. the Reactive Power Margin of SVC is maximum in quadratic sum meaning)：

Θ_svcIt is Reactive Power Margin indicator vector；

Constraints is

V_{B min}≤V_B0+CΔQ_D≤V_{B max} (1)

V_{B min}Represent busbar voltage lower limit, V_{B max}Bus voltage upper limit is represented, formula (1) represents each bus electricity in transformer station In the bound that pressure should set at it；The idle lower limits of SVC are represented,Represent the idle upper limits of SVC, Δ Q_DRepresent The Reactive-power control amount of SVC, Q_DThe idle of current SVC is represented to exert oneself；

Formula (2) represents that the Reactive-power control amount of SVC equipment all should be in its idle bound；Represent the maximum of SVC Regulation step-length；

Formula (3) represents that SVC Reactive-power control step-lengths should be less than its maximal regulated step-length；C is sensitivity squares of the SVC to bus Battle array；

4) following judgement is carried out again to Reactive-power control amount：If the Reactive-power control amount that i-th SVC equipment is calculated is Δ Q_Di, compare Δ Q_DiBe can adjust with its minimum idleSize；If any oneSVC, be discontented with FootThen enter 5)；Otherwise by Reactive-power control amount Δ Q_DIt is converted into control instruction and is issued to each SVC, completes SVC Idle control；

5) SVC carries out the displacement of static reactive and dynamic reactive with electric capacity, reactor：If voltage bar in current transformer substation Part allows first to adjust that SVC is idle, then first directly increase and decrease SVC is idle to increase dynamic reactive nargin, and lower whorl is controlled according to opposite Reactive-power control direction switched capacitor, reactor, so that the displacement of static reactive and dynamic reactive is completed, specifically, if Epicycle SVC additional issues are idle, then lower whorl is taken and cut capacitor or throwing reactor according to capacitor and the ruuning situation of reactor Control device (capacitor and reactor can not put into simultaneously, therefore cut electric capacity and throw reactance necessarily only a kind of selection)；If Epicycle SVC subtracts and sends out idle, then lower whorl takes throwing capacitor or cut reactor according to capacitor and the ruuning situation of reactor Control device；Otherwise it is transferred to 6)；

6) first according to opposite Reactive-power control direction switched capacitor, reactor, to increase or decrease busbar voltage so that Busbar voltage possesses enough margins of safety, and lower whorl controls to adjust that SVC is idle, so as to complete putting for static reactive and dynamic reactive Change, specifically, idle if necessary to SVC additional issues, then according to capacitor and the ruuning situation of reactor, epicycle is used and cuts electric capacity The control device of device or throwing reactor, it is idle that SVC is issued additional in lower whorl control again；Subtracting if necessary to SVC sends out idle, then according to electric capacity The ruuning situation of device and reactor, using throwing capacitor or cutting the control device of reactor, lower whorl control subtracts hair SVC to epicycle again It is idle.

SVC and capacitor, the idle method of replacing of reactor in transformer station proposed by the present invention, its is excellent Putting is：SVC Reactive-power control nargin can be kept so that electric capacity, reactor undertake the reactive requirement on slow basis, Reactive Power Margin Sufficient SVC undertakes quick reactive requirement, so as to improve the voltage stability of power network；By solving quadratic programming combination SVC Minimal condition step-length judge whether to need to carry out SVC and electric capacity, the idle displacement of reactor, solve the association that many SVC coexist Tune problem, reduces unnecessary electric capacity, reactor switching.

Specific embodiment

SVC and capacitor, the idle method of replacing of reactor in transformer station proposed by the present invention, including Following steps：

1) total number of SVC in transformer station is designated as N, i-th the current idle of SVC is designated as Q_Di, idle Upper-lower Limit value It is designated as respectivelyReactive-power control amount is designated as Δ Q_Di, the idle operating point of exerting oneself of acquiescence for presetting SVC is designated asTakeIf minimum, maximal regulated step-length is designated as successively SVC Reactive Power Margin threshold value is designated asEngineer applied can typically take

2) the Reactive Power Margin index of i-th SVC after adding Reactive-power control amount is setIfThen it is transferred to 3), does not enter line replacement control otherwise, terminates；

3) the following quadratic programming model being made up of optimization aim and constraints is solved, the Reactive-power control amount of SVC is obtained, (for convenience) each amount uses vector representation below, and optimization aim is that the Reactive Power Margin index quadratic sum of all SVC is minimum (i.e. the Reactive Power Margin of SVC is maximum in quadratic sum meaning),：

Θ_svcIt is Reactive Power Margin indicator vector,

It is constrained to

V_{B min}≤V_B0+CΔQ_D≤V_{B max} (1)

V_{B min}Represent busbar voltage lower limit, V_{B max}Bus voltage upper limit is represented, formula (1) represents each bus electricity in transformer station In the bound that pressure should set at it；The idle lower limits of SVC are represented,Represent the idle upper limits of SVC, Δ Q_DRepresent The Reactive-power control amount of SVC, Q_DRepresent the idle of current SVC to exert oneself, the Reactive-power control amount of formula (2) SVC equipment all should be idle at its In bound；The maximal regulated step-length of SVC is represented, formula (3) represents SVC Reactive-power control step-lengths and should be less than its maximum tune Section step-length；C is sensitivity matrix of the SVC to bus；

4) following judgement is carried out again to Reactive-power control amount：If the Reactive-power control amount that i-th SVC equipment is calculated is Δ Q_Di, compare Δ Q_DiBe can adjust with its minimum idleSize；If any oneSVC, be discontented with FootThen enter 5)；Otherwise by Reactive-power control amount Δ Q_DIt is converted into control instruction and is issued to each SVC, completes SVC Idle control；

5) SVC carries out the displacement of static reactive and dynamic reactive with electric capacity, reactor：If voltage bar in current transformer substation Part allows first to adjust that SVC is idle, then first directly increase and decrease SVC is idle to increase dynamic reactive nargin, and lower whorl is controlled according to opposite Reactive-power control direction switched capacitor, reactor, so that the displacement of static reactive and dynamic reactive is completed, specifically, if Epicycle SVC additional issues are idle, then lower whorl is taken and cut capacitor or throwing reactor according to capacitor and the ruuning situation of reactor Control device (capacitor and reactor can not put into simultaneously, therefore cut electric capacity and throw reactance necessarily only a kind of selection)；If Epicycle SVC subtracts and sends out idle, then lower whorl takes throwing capacitor or cut reactor according to capacitor and the ruuning situation of reactor Control device；Otherwise it is transferred to 6)；

6) then, to increase or decrease busbar voltage, make first according to opposite Reactive-power control direction switched capacitor, reactor Obtain busbar voltage and possess enough margins of safety, SVC is idle for lower whorl control and regulation, so as to complete static reactive with dynamic reactive Displacement, specifically, idle if necessary to SVC additional issues, then according to capacitor and the ruuning situation of reactor, epicycle is used and cuts electricity The control device of container or throwing reactor, it is idle that SVC is issued additional in lower whorl control again；Subtracting if necessary to SVC sends out idle, then according to electricity The ruuning situation of container and reactor, using throwing capacitor or cutting the control device of reactor, lower whorl control subtracts hair to epicycle again SVC is idle.

Claims (1)

1. a kind of SVC and capacitor, the idle displacement control method of reactor, it is characterised in that the method bag Include following steps：

1) total number of SVC in transformer station is designated as N, i-th the current idle of SVC is designated as Q_Di, idle Upper-lower Limit value difference It is designated asReactive-power control amount is designated as △ Q_Di, the idle operating point of exerting oneself of acquiescence for presetting SVC is designated as TakeIf adjustable idle it is designated as successively minimum, maximumSVC is idle Nargin threshold value is designated as

2) the Reactive Power Margin indicator vector of i-th SVC after adding Reactive-power control amount is setIfThen it is transferred to 3), does not enter line replacement control otherwise, terminates；

3) the following quadratic programming model being made up of optimization aim and constraints is solved, the Reactive-power control amount of SVC is obtained, below Each amount uses vector representation, and optimization aim is that the Reactive Power Margin indicator vector quadratic sum of all SVC is minimum：

$\underset{{\mathrm{\ΔQ}}_D}{min}\left\{\right|\left|{\mathrm{\Θ}}_{svc}\right|{|}^2\}$

Θ_svcIt is Reactive Power Margin indicator vector,

Constraints is

V_Bmin≤V_B0+C△Q_D≤V_Bmax (1)

$Q_D^{DownLmt}\≤Q_D+{\mathrm{\ΔQ}}_D\≤Q_D^{UpLmt}---\left(2\right)$

$\left|{\mathrm{\&Delta;Q}}_D\right|<{\mathrm{\&Delta;Q}}_{svc}^{\max step}---\left(3\right)$

V_BminRepresent busbar voltage lower limit, V_BmaxRepresent bus voltage upper limit, formula (1) represents in transformer station each busbar voltage should be In the bound of its setting；The idle lower limits of SVC are represented,Represent the idle upper limits of SVC, △ Q_DRepresent the idle of SVC Regulated quantity, Q_DRepresent the idle of current SVC to exert oneself, the Reactive-power control amount that formula (2) represents SVC equipment all should be in its idle bound It is interior；The maximum for representing SVC can adjust idle, and formula (3) represents SVC Reactive-power control amounts and should be less than its adjustable nothing of maximum Work(；C is sensitivity matrix of the SVC to bus；

4) following judgement is carried out again to Reactive-power control amount：If the Reactive-power control amount that i-th SVC equipment is calculated is △ Q_Di, than Compared with △ Q_DiBe can adjust with its minimum idleSize；If any oneSVC, be unsatisfactory forThen enter 5)；Otherwise by Reactive-power control amount △ Q_DBe converted into control instruction and be issued to each SVC, complete SVC without The control of work(；

5) SVC carries out the displacement of static reactive and dynamic reactive with capacitor, reactor：If voltage conditions in current transformer substation Allow first to adjust SVC idle, then first directly increase and decrease SVC is idle to increase dynamic reactive nargin, and lower whorl is controlled according to opposite nothing Work(regulation direction switched capacitor, reactor, so as to complete the displacement of static reactive and dynamic reactive；Otherwise it is transferred to 6)；

6) first according to opposite Reactive-power control direction switched capacitor, reactor, to increase or decrease busbar voltage so that bus Voltage possesses enough margins of safety, and SVC is idle for lower whorl control and regulation, so as to complete the displacement of static reactive and dynamic reactive.