CN105207224A - Reactive replacement control method for static Var compensators, capacitor and electric reactor - Google Patents

Abstract

The invention relates to a reactive replacement control method for static Var compensators, a capacitor and an electric reactor and belongs to the technical field of electric-power automatic voltage control. According to the method, the reactive margin of each SVC is calculated at first, when the reactive margin of any SVC does not meet a set threshold, the reactive coordination strategy between the SVCs is generated, if the generated strategy is verified that the adjustment amount of each SVC does not meet the respective minimum reactive condition step size, reactive replacement of the SVCs, the capacitor and the electric reactor is triggered, if voltage conditions in a transformer substation allow the SVCs to be adjusted firstly, and after SVC adjustment is carried out, the opposite reactive adjustment direction strategy is generated by control in the next period to switch the capacitor and the electric reactor, so that static reactive and dynamic reactive replacement is finished; if voltage is not allowed to be adjusted, the reactive replacement strategy of the switching capacitor and the electric reactor is generated according to the opposite adjustment direction, so that the voltage of a bus is increased or decreased, and has enough safety margin, then each SVC is adjusted to be reactive, and static reactive and dynamic reactive replacement is finished.

Description

The idle displacement control method of Static Var Compensator and capacitor, reactor

Technical field

The present invention relates to the idle displacement control method of a kind of Static Var Compensator and capacitor, reactor, belong to electric power system automatism voltage control field.

Background technology

Automatism voltage control (AutomaticVoltageControl, hereinafter referred to as AVC) become modern power systems and dispatch indispensable part, AVC is by coordinating various control appliance devices such as () generator, capacitor, reactor, load tap changer, Static Var Compensator (be called for short SVC), static reacance generators, control the reasonable idle flowing of each electric pressure, reduce grid loss, improve Network Voltage Stability.

Tertiary voltage control based on soft sectoring becomes the main flow control model of domestic AVC, and one of them important link is exactly the idle control of transformer station.Common equipment in transformer station comprises capacitor, reactor, and many documents and patent are studied for the cooperation control of transformer station's inner capacitor, reactor and analyze, and mainly can be divided into two kinds: a kind of is the mode of traditional nine-zone diagram, 17 district figure; Another kind is the strategy based on Expert Rules storehouse.From applicable cases, the former is many as the local strategy foundation controlled, and the latter is the superset of the former control strategy, and control more meticulous, strategy is more flexible, and general effect is better.Guo Qing comes, the people such as Sun Hongbin " in transformer station (and in automatism voltage control continuous variable and discrete variable coordination approach (one) transformer station in coordinate voltage control " (Automation of Electric Systems, in August, 2008 V32N8, pp39-42) in set forth transformer station and adopt expert control strategy to complete the strategy of cooperation control.

There are stronger Reactive-power control ability and Reactive-power control speed faster in the transformer station of configuration SVC, and SVC can regulate continuously in certain scope, and based on semiconductor controls such as thyristors, possesses very fast dynamic reactive responding ability.When electrical network receives disturbance or electric network reactive-load demand Rapid Variable Design, can quick adjustment, ensure Reactive Power Balance, thus improve voltage stabilization.If control mode is improper, easily causes SVC to stick limit or lower limit operation, greatly weaken Reactive-power control ability, cannot interdependent system fasting conditions reactive requirement.How to coordinate SVC and electric capacity, reactor in transformer station, keep the higher Reactive-power control nargin of SVC, carry out under triggering under suitable condition capacitor, the static reactive of reactor and the dynamic reactive of SVC replace be one highly significant with the problem be worth.Here suitable condition, comprises coordination in station between SVC and SVC and electric capacity, reactor and coordinates opportunity; When there is multiple stage SVC, the Reactive Power Margin of separate unit SVC is not enough in coordinating improper causing between SVC, just should trigger the idle displacement of SVC and capacitor, reactor, therefore so-called SVC and capacitor, link that the idle method of replacing of reactor is very important are exactly trigger condition.

Wang Xuran, Guo Qing such as to carry out at the idle Replacement Strategy that people have studied SVC and power plant in automatism voltage control, the mode that the two-stage controls is adopted during AVC Two-stage control, first balance idle, the rear idle displacement realizing SVC and power generator, about the control strategy of SVC and power plant see " considering the secondary voltage control of quick dynamic passive compensation " (Automation of Electric Systems, 39th volume the 2nd phase in 2015), but in this article, do not provide electric capacity, the reactor of SVC and discrete control appliance.

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

Summary of the invention

Object of the present invention is intended to solve the deficiencies in the prior art, the idle displacement control method of a kind of Static Var Compensator and capacitor, reactor is proposed, realize the displacement of static reactive and dynamic reactive, thus ensure that the enough Reactive Power Margin of SVC is with the fast reactive regulatory demand of responsive electricity grid, improves voltage stability.

The idle method of replacing of Static Var Compensator and capacitor, reactor in the transformer station that the present invention proposes, comprises the following steps:

1) total number of SVC in transformer station is designated as N, the current idle of i-th SVC is designated as Q _di, idle Upper-lower Limit value is designated as respectively reactive-power control amount is designated as Δ Q _di, the idle operating point of exerting oneself of acquiescence presetting SVC is designated as get if minimum, maximal regulated step-length is designated as successively sVC Reactive Power Margin threshold value is designated as engineer applied generally can be got

2) the Reactive Power Margin index of after adding Reactive-power control amount i-th SVC is established if then proceed to 3), otherwise do not carry out displacement control, terminate;

3) the following quadratic programming model be made up of optimization aim and constraints is solved, obtain the Reactive-power control amount of SVC, (for simplicity) each amount adopts vector representation below, and optimization aim is the Reactive Power Margin index quadratic sum of all SVC minimum (namely the Reactive Power Margin of SVC is maximum in quadratic sum meaning):

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

Θ _svcit is Reactive Power Margin indicator vector;

Constraints is.

V _Bmin≤V _B0+CΔQ _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 each busbar voltage in transformer station should in the bound of its setting; represent the idle lower limit of SVC, represent the idle upper limit of SVC, Δ Q _drepresent the Reactive-power control amount of SVC, Q _drepresent the idle of current SVC to exert oneself;

Formula (2) represents that the Reactive-power control amount of SVC equipment all should in its idle bound; represent the maximal regulated step-length of SVC;

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

4) following judgement is carried out to Reactive-power control amount: the Reactive-power control amount of setting i-th SVC equipment to calculate is as Δ Q _di, compare Δ Q _diminimum adjustable idle with it size; If any one sVC, all do not meet then enter 5); Otherwise by Reactive-power control amount Δ Q _dconvert control command to and be issued to each SVC, complete the control that SVC is idle;

5) SVC and electric capacity, reactor carries out the displacement of static reactive and dynamic reactive: if voltage conditions allows first to regulate SVC idle in current transformer substation, then first directly increase and decrease SVC idle to increase dynamic reactive nargin, lower whorl controls according to contrary Reactive-power control direction switched capacitor, reactor, thus complete the displacement of static reactive and dynamic reactive, specifically, if epicycle SVC additional issue is idle, so lower whorl is according to the ruuning situation of capacitor and reactor, take to cut capacitor or throw reactor control device that (capacitor and reactor can not drop into simultaneously, therefore cut electric capacity and throw reactance and must only have a kind of selection), send out idle if epicycle SVC subtracts, so lower whorl is according to the ruuning situation of capacitor and reactor, takes throw capacitor or cut reactor control device, otherwise proceed to 6),

6) first according to contrary Reactive-power control direction switched capacitor, reactor, to increase or to reduce busbar voltage, busbar voltage is made to possess enough margins of safety, lower whorl regulating and controlling SVC is idle, thus completes the displacement of static reactive and dynamic reactive, specifically, if it is idle to need SVC to issue additional, then according to the ruuning situation of capacitor and reactor, epicycle adopts the control device of cutting capacitor or throwing reactor, and it is idle that lower whorl controls to issue additional SVC again; If needing SVC to subtract sends out idle, then according to the ruuning situation of capacitor and reactor, epicycle adopts the control device of throwing capacitor or cutting reactor, and lower whorl controls to subtract that to send out SVC idle again.

The idle method of replacing of Static Var Compensator and capacitor, reactor in the transformer station that the present invention proposes, its advantage is: can keep SVC Reactive-power control nargin, make electric capacity, reactor bear slowly basis reactive requirement, the SVC of Reactive Power Margin abundance bears reactive requirement fast, thus improves the voltage stability of electrical network; Judging whether to need to carry out the idle displacement of SVC and electric capacity, reactor by solving quadratic programming in conjunction with the minimal condition step-length of SVC, solving the coordination problem that many SVC coexist, reducing unnecessary electric capacity, reactor switching.

Embodiment

The idle method of replacing of Static Var Compensator and capacitor, reactor in the transformer station that the present invention proposes, comprises the following steps:

1) total number of SVC in transformer station is designated as N, the current idle of i-th SVC is designated as Q _di, idle Upper-lower Limit value is designated as respectively reactive-power control amount is designated as Δ Q _di, the idle operating point of exerting oneself of acquiescence presetting SVC is designated as get if minimum, maximal regulated step-length is designated as successively sVC Reactive Power Margin threshold value is designated as engineer applied generally can be got

2) the Reactive Power Margin index of after adding Reactive-power control amount i-th SVC is established if then proceed to 3), otherwise do not carry out displacement control, terminate;

3) the following quadratic programming model be made up of optimization aim and constraints is solved, obtain the Reactive-power control amount of SVC, (for simplicity) each amount adopts vector representation below, optimization aim is the Reactive Power Margin index quadratic sum of all SVC minimum (namely the Reactive Power Margin of SVC is maximum in quadratic sum meaning):

$\underset{{\mathrm{\&Delta;Q}}_D}{min}\left\{\right|\left|{\mathrm{\&Theta;}}_{svc}\right|{|}^2\}$

Θ _svcreactive Power Margin indicator vector,

Be constrained to.

V _Bmin≤V _B0+CΔQ _D≤V _Bmax(1)

$Q_D^{DownLmt}\&le;Q_D+{\mathrm{\&Delta;Q}}_D\&le;Q_D^{UpLmt}---\left(2\right)$

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

V _bminrepresent busbar voltage lower limit, V _bmaxrepresent bus voltage upper limit, formula (1) represents each busbar voltage in transformer station should in the bound of its setting; represent the idle lower limit of SVC, represent the idle upper limit 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 in its idle bound; represent the maximal regulated step-length of SVC, formula (3) represents SVC Reactive-power control step-length should be less than its maximal regulated step-length; C is the sensitivity matrix of SVC to bus;

4) following judgement is carried out to Reactive-power control amount: the Reactive-power control amount of setting i-th SVC equipment to calculate is as Δ Q _di, compare Δ Q _diminimum adjustable idle with it size; If any one sVC, all do not meet then enter 5); Otherwise by Reactive-power control amount Δ Q _dconvert control command to and be issued to each SVC, complete the control that SVC is idle;

5) SVC and electric capacity, reactor carries out the displacement of static reactive and dynamic reactive: if voltage conditions allows first to regulate SVC idle in current transformer substation, then first directly increase and decrease SVC idle to increase dynamic reactive nargin, lower whorl controls according to contrary Reactive-power control direction switched capacitor, reactor, thus complete the displacement of static reactive and dynamic reactive, specifically, if epicycle SVC additional issue is idle, so lower whorl is according to the ruuning situation of capacitor and reactor, take to cut capacitor or throw reactor control device that (capacitor and reactor can not drop into simultaneously, therefore cut electric capacity and throw reactance and must only have a kind of selection), send out idle if epicycle SVC subtracts, so lower whorl is according to the ruuning situation of capacitor and reactor, takes throw capacitor or cut reactor control device, otherwise proceed to 6),

6) then first according to contrary Reactive-power control direction switched capacitor, reactor, to increase or to reduce busbar voltage, busbar voltage is made to possess enough margins of safety, lower whorl regulating and controlling SVC is idle, thus completes the displacement of static reactive and dynamic reactive, specifically, if it is idle to need SVC to issue additional, then according to the ruuning situation of capacitor and reactor, epicycle adopts the control device of cutting capacitor or throwing reactor, and it is idle that lower whorl controls to issue additional SVC again; If needing SVC to subtract sends out idle, then according to the ruuning situation of capacitor and reactor, epicycle adopts the control device of throwing capacitor or cutting reactor, and lower whorl controls to subtract that to send out SVC idle again.

Claims (1)

1. an idle displacement control method for Static Var Compensator and capacitor, reactor, is characterized in that the method comprises the following steps:

1) total number of SVC in transformer station is designated as N, the current idle of i-th SVC is designated as Q _di, idle Upper-lower Limit value is designated as respectively reactive-power control amount is designated as Δ Q _di, the idle operating point of exerting oneself of acquiescence presetting SVC is designated as get $Q_{Di}^{Set}=(Q_{Di}^{UPLmt}+Q_{Di}^{DownLmt})/2;$ If minimum, maximal regulated step-length is designated as successively sVC Reactive Power Margin threshold value is designated as

2) the Reactive Power Margin index of after adding Reactive-power control amount i-th SVC is established if then proceed to 3), otherwise do not carry out displacement control, terminate;

3) solve the following quadratic programming model be made up of optimization aim and constraints, obtain the Reactive-power control amount of SVC, each amount adopts vector representation below, and optimization aim is that the Reactive Power Margin index quadratic sum of all SVC is minimum:

$\underset{{\mathrm{\&Delta;Q}}_D}{min}\left\{\right|\left|{\mathrm{\&Theta;}}_{svc}\right|{|}^2\}$

Θ _svcreactive Power Margin indicator vector,

Constraints is.

V _Bmin≤V _B0+CΔQ _D≤V _Bmax(1)

$Q_D^{DownLmt}\&le;Q_D+{\mathrm{\&Delta;Q}}_D\&le;Q_D^{UpLmt}---\left(2\right)$

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

V _bminrepresent busbar voltage lower limit, V _bmaxrepresent bus voltage upper limit, formula (1) represents each busbar voltage in transformer station should in the bound of its setting; represent the idle lower limit of SVC, represent the idle upper limit of SVC, Δ Q _drepresent the Reactive-power control amount of SVC, Q _drepresent the idle of current SVC to exert oneself, formula (2) represents the Reactive-power control amount of SVC equipment all should in its idle bound; represent the maximal regulated step-length of SVC, formula (3) represents SVC Reactive-power control step-length should be less than its maximal regulated step-length; C is the sensitivity matrix of SVC to bus;

4) following judgement is carried out to Reactive-power control amount: the Reactive-power control amount of setting i-th SVC equipment to calculate is as Δ Q _di, compare Δ Q _diminimum adjustable idle with it size; If any one sVC, all do not meet then enter 5); Otherwise by Reactive-power control amount Δ Q _dconvert control command to and be issued to each SVC, complete the control that SVC is idle;

5) SVC and electric capacity, reactor carry out the displacement of static reactive and dynamic reactive: if voltage conditions allows first to regulate SVC idle in current transformer substation, then first directly increase and decrease SVC idle to increase dynamic reactive nargin, lower whorl controls according to contrary Reactive-power control direction switched capacitor, reactor, thus completes the displacement of static reactive and dynamic reactive; Otherwise proceed to 6);

6) first according to contrary Reactive-power control direction switched capacitor, reactor, to increase or to reduce busbar voltage, make busbar voltage possess enough margins of safety, lower whorl regulating and controlling SVC is idle, thus completes the displacement of static reactive and dynamic reactive.