CN101267114A - Control method for power plant and transformer station coordination voltage based on real time update of coordination restraint - Google Patents

Abstract

The present invention provides a coordinated voltage control method based on the coordinating and restricting a real-time updating power plant and substation, belonging to power system automatic voltage control technical field. The invention selects the substation bus as a coordination variable between plants, firstly, each substation is processed with instation automatic voltage control according to the method of ''Nine zone pictures'', and according to the control result, the constraint condition of the coordination variable of the substation is real-time updated by adopting expert rules method; a constraint condition is added to the coordinated secondary voltage control mode of the region to unify solution, reactive power control strategy of the generator is solved. The CSVC mode has no discrete variable, belonging to conventional secondary planning mode, avoiding the resolving of the problem of the complex mixed integer programming, improving the credibility of the real-time control.

Description

Power plant and transformer station's coordinating voltage control method based on the coordination constraint real-time update

Technical field

The invention belongs to electric power system automatism voltage control technical field, particularly () factory and (power transformation) coordinating voltage control method of standing.

Background technology

Automatism voltage control is (hereinafter to be referred as AVC, Automatic Voltage Control) system realizes the important means of power grid security (raising voltage stability margin), economic (reduction via net loss), high-quality (raising rate of qualified voltage) operation, its control device has comprised continuous variable (generator reactive of Power Plant Side) and discrete variable (electric capacity of transformer station's side, reactance, on-load transformer tap changer (OLTCs)), automatism voltage control is coordinated these control variables in essence exactly, thereby satisfies the process that reasonable reactive voltage distributes.This relates to the coordination control that how to realize continuous variable and discrete variable.

Forefathers have carried out relevant research at how taking all factors into consideration continuous variable in the idle work optimization with discrete variable, typical method comprises resolves class algorithm and evolution class algorithm, the former is with Cheng Ying, Liu Mingbo etc. are at " the large-scale electrical power system idle work optimization that contains discrete control variables " (Proceedings of the CSEE, 2002,22 (5): 54 ~ 60) method of Ti Chuing is representative, the latter knows warbler with fourth, Wang Xifan, Chen Haoyong is at " a kind of combinational algorithm of finding the solution optimal load flow " (Proceedings of the CSEE, 2002,22 (12): 11-16) method of Ti Chuing is representative.But automatism voltage control is not equal at the idle work optimization of line computation or optimal load flow, and reliability and practicality from control relate to a lot of particular problems.In various countries' automatism voltage control pertinent literature, the coordination problem that how to realize discrete variable and continuous variable is not carried out system as yet and cross elaboration at present.

Relate to secondary voltage control, control sensitivity calculations in the existing voltage control method and, be described below respectively based on transformer station's automatic voltage control method of nine administrative division maps:

(1) secondary voltage control method

The inventor once proposed the correlation technique (patent No. is ZL200510098527.3) that name is called the voltage control method of soft sectoring " in the electric power system based on ", its principle is by coordination secondary voltage control (hereinafter to be referred as the CSVC method) method based on soft sectoring, variation according to electric network composition, self adaptation provides the system partitioning scheme under the current state, and its target function is as follows:

$\underset{{\mathrm{\ΔQ}}_g}{\min }\{W_p{\left|\right|a\·(V_p-V_p^{\mathrm{ref}})+C_g{\mathrm{\ΔQ}}_g\left|\right|}^2+W_q{\left|\right|\frac{Q_g+{\mathrm{\ΔQ}}_g-Q_g^{\min }}{Q_g^{\max }-Q_g^{\min }}\left|\right|}^2\}---\left(1\right)$

In the formula, Δ Q _gRepresent the regulated quantity (controlled quentity controlled variable) that controlled generator reactive is exerted oneself; Q _g, Q _g ^MinAnd Q _g ^MaxRepresent controlled generator reactive currency, lower limit and the upper limit respectively; V _pAnd V _p ^RefCurrent voltage of expression maincenter bus and setting voltage; W _pAnd W _qBe weight coefficient, α is a gain coefficient; C _gBe of the sensitivity of maincenter busbar voltage to controlled generator reactive.Wherein, Q _g, V _pBe real-time collection capacity; V _p ^RefBe known quantity, optimize link by other and provide; α, W _p, W _qBe known quantity, given by control experience; Q _g ^Min, Q _g ^MaxBe known quantity, can directly obtain; C _gBe known quantity, obtain by sensitivity calculations; Controlled quentity controlled variable Δ Q _gObtain by finding the solution this CSVC Mathematical Modeling.

Deviation minimum after first the expression control of target function type (1) between maincenter busbar voltage and the set point, second expression of target function type (1) be the idle ratio of exerting oneself of control back generator, for certain generator, this ratio is more little, the idle nargin that this generator is described is big more, and appear in the target function with the form of quadratic sum, will impel each generator to develop to the idle more balanced direction of exerting oneself, help improving the voltage stability of electrical network.Complete CSVC Mathematical Modeling requires satisfying the minimization problem of finding the solution formula (1) under the situation of security constraints, and these constraints comprise:

$|C_{\mathrm{vg}}\·{\mathrm{\ΔQ}}_g|\≤\mathrm{\Δ}{V}_H^{\max }---\left(2\right)$

$V_H^{\min }\≤V_H+C_{\mathrm{vg}}\·\mathrm{\Δ}{Q}_g\≤V_H^{\max }---\left(3\right)$

$V_p^{\min }\≤V_p+C_g\·\mathrm{\Δ}{Q}_g\≤V_p^{\max }---\left(4\right)$

$Q_g^{\min }\≤Q_g+\mathrm{\Δ}{Q}_g\≤Q_g^{\max }---\left(5\right)$

In the formula, V _p, V _p ^MinAnd V _p ^MaxRepresent maincenter busbar voltage currency, lower limit and the upper limit respectively; Q _g, Q _g ^MinAnd Q _g ^MaxRepresent controlled generator reactive currency, lower limit and the upper limit respectively; V _H, V _H ^Min, V _H ^MaxWith Δ V _H ^MaxThe maximum adjustment amount of single step of representing currency, lower limit, the upper limit and the permission of controlled generator high-voltage side bus voltage respectively; C _VgBe of the sensitivity of controlled generator high-voltage side bus voltage to generator reactive.

In order to prevent that control operation from causing excessive fluctuation to electrical network, therefore in each step control, all the control step-length there is strict restriction, this is realized that by constraint equation (2) its physical meaning is V after the control just _HAdjustment amount be less than the maximum adjustment amount Δ of the single step V of permission _H ^MaxConstraint equation (3) and (4) have guaranteed can not cause V after the control _pAnd V _HProduce out-of-limitly, also can similarly add in the constraints for some other important busbar voltage.Constraint equation (5) has guaranteed that idle the exerting oneself of control back generator can be not out-of-limit.

(2) sensitivity computing method

In the voltage control process, relate to the control Sensitivity calculation.Sun Hongbin, Zhang Baiming, Xiang Niande is at " quasi-stationary sensitivity analysis method " (Proceedings of the CSEE, in April, 1999 V19N4, pp.9-13) proposed the new sensitivity method in, different with the sensitivity analysis method of the static state of routine, the new sensitivity method has been considered the quasi-stationary physical responses of electric power system, take into account the total variation between system's new and old stable state in control front and back, effectively improved the precision of sensitivity analysis.This method when generator is equipped with automatic voltage regulator (AVR), can think that this generator node is the PV node based on the PQ Decoupled Model of electric power system; And when generator is equipped with automatic reactive power and regulates (AQR) or automatic power factor and regulate (APFR), can think the identical PQ of the being node of this generator node with common load bus.In addition, the load voltage static characteristic is considered to node voltage once or conic section.The tide model of being set up just takes in these quasi-stationary physical responses naturally like this, thereby is quasi-stationary sensitivity based on the sensitivity that tide model calculates.Under tide model, establish the PQ node and PV node number is respectively N _PQAnd N _PV, quantity of state x is the voltage magnitude of PQ node $V_{\mathrm{PQ}}\∈R^{N_{\mathrm{PQ}}},$ Control variables u=[Q _PQV _PVT _k] ^T, wherein $Q_{\mathrm{PQ}}\∈R^{N_{\mathrm{PQ}}}$ Be the idle injection of PQ node, $V_{\mathrm{PV}}\∈R^{N_{\mathrm{PV}}}$ Be the voltage magnitude of PV node, $T_k\∈R^{N_T}$ Be transformer voltage ratio, the important variable h=[Q that complys with _bQ _PV] ^T, Q wherein _b∈ R ^b' be the branch road reactive power flow, $Q_{\mathrm{PV}}\∈R^{N_{\mathrm{PV}}}$ It is the idle injection of PV node.At this moment, idle tide model is arranged:

Q _PQ(V _PQ，V _PV，T _k)＝0(6)

Q _b＝Q _b(V _PQ，V _PV，T _k)(7)

Q _PV＝Q _PV(V _PQ，V _PV，T _k)(8)

Can get the idle class Sensitivity calculation of quasi-stable state formula and see Table 1.

The quasi-stationary idle class sensitivity S of table 1 _{(x, h) u}Computing formula

Wherein $S_{V_{\mathrm{PQ}}{Q}_{\mathrm{PQ}}}=-{\left[\frac{{\∂Q}_{\mathrm{PQ}}}{{\∂V}_{\mathrm{PQ}}}\right]}^{-1},$ All amounts in the last table can directly be inverted and obtain tide model (the 1)-Jacobian matrix of (3).

(3) transformer station's automatic voltage control method

The main thought of transformer station's automatism voltage control is according to the method for " nine districts figure " or " expansion nine districts figure ", and discrete device such as capacitor, reactor and OLTC are adjusted, and shown in Fig. 1 (a), U is the voltage of substation secondary side bus among the figure,

Be respectively the power factor of transformer high-voltage side winding and idle with Q,

With

The expression power factor

The lower bound and the upper bound, U _MinAnd U _MaxThe lower bound and the upper bound of expression voltage U,

[U _Min, U _Max] at coordinate system

The last division control area coldest days of the year end (area 0 is to zone 8), wherein area 0 is normal operation area, need not control; And, can specify control corresponding equipment action policy at other each control areas, and such as one group of electric capacity of switching, perhaps the load tap changer gear is adjusted 1 grade, and target is to make the running status of transformer station enter area 0 by control.When actual motion, according to the current data of substation operation

Can obtain its control area affiliated in Fig. 1 (a), and further carry out the pairing control strategy in this control area, make the running status of transformer station enter area 0.

Be near the operating point in zone boundary among Fig. 1 (a),, might operate oscillatory occurences as A, B, C and D point.Simultaneously, only adopt Or the fixing upper lower limit value of Q can not reflect the size and Orientation of reactive power comprehensively.Hu Jinshuan is at " based on the area power grid reactive voltage closed-loop control system of classification coordination " (Tsing-Hua University's Master of engineering paper, 2004) tradition nine district figure from the limit value of subregion splitting scheme, reactive power or power factor and three aspects of control strategy to Fig. 1 (a) improve, propose improved nine district figure methods such as Fig. 1 (b), be described below:

(1) subregion splitting scheme.At first substitute the power factor of tradition nine district figure with the reactive power Q bound

Bound; Therefore consider that then 2 districts of traditional nine district figure and the action policy in 7 districts, 1 district and 8 districts are duplicate, they are merged into 8 districts and 7 districts in the corresponding diagram 1 (b) respectively; In addition, in order to prevent the capacitor switching concussion, with close U in 3 districts _Max, in 4 districts near U _MinOperating point separate, come individual processing as a zone respectively.Improvement nine district figure after renumbeing shown in Fig. 1 (b), among the figure, Δ U ₊For throwing the voltage variety that capacitor causes, Δ U _-For cutting the voltage variety that capacitor causes.

(2), dynamically determine the upper lower limit value Q of Q to be asked among the nine district figure according to the real-time power network running status owing to the upper lower limit value of Q among the nine district figure is relevant with the operation of power networks state _MinAnd Q _MaxThen according to Q _MinAnd Q _MaxJudge whether that this cuts the throwing capacitor.

(3) according to the division and the limit value of above-mentioned subregion, can determine a kind of control strategy such as table 2.The basic principle of formulating this control strategy is: the qualified then uncomfortable main transformer tap of voltage; Out-of-limit by the voltage that idle irrational distribution causes, then at first consider switched capacitor.

The improved nine district figure control strategy tables of table 2

The secondary voltage control method of Ti Chuing is mainly based on continuous variables such as consideration generators in history, and transformer station's automatic voltage control method is then based on discrete variables such as consideration capacitors.The continuous variable of power plant and the discrete variable of transformer station are not implemented effective coordination, cause power plant's (continuous variable is main) and transformer station's (discrete variable is main) easy of the sequential mismatch causes irrational idle flowing in automatism voltage control, be unfavorable for safety, high-quality, the economical operation of electrical network.

Summary of the invention

The objective of the invention is for overcoming the weak point of prior art, a kind of power plant and transformer station's coordinating voltage control method (be called for short the factory station down and coordinate voltage control) based on the coordination constraint real-time update proposed, be limited to coordination constraint up and down with substation bus bar voltage, the discrete variable that has solved the continuous variable of power plant in the automatism voltage control and transformer station is coordinated the problem of control, has avoided the mixed integer programming problem of line solver complexity simultaneously.

The factory's station coordinating voltage control method based on the coordination constraint real-time update that the present invention proposes is characterized in that this method may further comprise the steps:

1) the voltage control zone is made up of m power plant and n transformer station, and m, n are natural number; Choose the voltage vector V of transformer station's side monitoring bus _sAs the coordination variable between power plant and the transformer station, when a control cycle begins, gather the current numerical value V of coordination variable in real time _s ^Cur

2) utilize " the nine districts figure " Expert Rules that pre-establishes, obtain i transformer station, the switching sequence of capacity reactance device and the controlled quentity controlled variable of on-load transformer tap changer; Wherein, i=1 .., n;

3) i transformer station of real-time update, coordination variable

Lower limit

And the upper limit

The lower limit and the upper limit of the coordination variable of all n transformer station in the described voltage control zone are gathered, obtain coordination variable in the described voltage control zone restriction range [ V' _s, V ' _s];

4) make up the coordination secondary voltage control model in described voltage control zone, find the solution the idle regulated quantity Δ Q of Power Plant Side generator _gIt is as follows that this coordinates the secondary voltage control model:

$\underset{{\mathrm{\ΔQ}}_g}{\min }{\left|\right|(V_p-V_p^{\mathrm{ref}})+C_{\mathrm{pg}}{\mathrm{\ΔQ}}_g\left|\right|}^2+{\left|\right|(V_s-V_s^{\mathrm{ref}})+C_{\mathrm{sg}}\mathrm{\Δ}{Q}_g\left|\right|}^2$

s.t. V _p≤V _p+C _pgΔQ _g≤V _p

V′ _s≤V _s+C _sgΔQ _g≤V′ _s

Q _g≤Q _g+ΔQ _g≤Q _g

Δ Q wherein _gBeing the variable quantity vector that generator reactive is exerted oneself, is control variables, V _pAnd Q _gBe respectively that power plant's high-voltage side bus voltage vector and generator reactive go out force vector, V _pAnd V _pRepresent the high-voltage side bus voltage vector V of power plant respectively _pThe lower limit and the upper limit, Q _gAnd Q _gRepresent that respectively generator reactive goes out force vector Q _gThe lower limit and the upper limit, C _Pg, C _SgBe respectively Δ Q _gTo V _pAnd V _sSensitivity matrix; V _p ^RefAnd V _s ^RefRepresenting the optimization set point of Power Plant Side bus and transformer station's side bus voltage respectively, is known quantity;

5) according to step 2) the switching sequence of the capacity reactance device that obtains and the controlled quentity controlled variable of on-load transformer tap changer, realize closed-loop adjustment to each transformer station's control appliance of described voltage control zone; The idle regulated quantity of the Power Plant Side that obtains according to step 4) is to the idle realization closed-loop adjustment of exerting oneself of described voltage control each power plant of zone;

6) when control cycle arrival next time, return step 1).

Characteristics of the present invention and effect:

In the methods of the invention, core procedure is a step 3), be that coordination constraint upgrades link, adopt the transformer substation voltage constraint, between the coordination secondary voltage control method of traditional transformer station's automatic voltage control method and power plant, carried out effective coordination as coordination constraint.

Transformer station's automatism voltage control link of the inventive method was finished before power plant's control decision, the principle that meets " discrete device is preferentially moved; the meticulous adjusting of continuous device ", consequently main reactive power compensation is born by transformer station, and the power generator with quick and continuous regulating power is in the state of bigger adjusting nargin all the time, improve electrical network and born the ability of accident disturbance, improved the fail safe of electrical network, satisfied the needs of on-site coordination control.

Description of drawings

The nine district figure methods that Fig. 1 uses for transformer substation voltage control.

Fig. 2 is a control flow chart of the present invention.

Embodiment

The present invention proposes reaches embodiment in conjunction with the accompanying drawings based on the power plant of coordination constraint real-time update and transformer station's coordinating voltage control method and is described in detail as follows:

The present invention is based on the principle of " transformer station's discrete device is preferentially moved, the meticulous adjusting of power plant's continuous device ", the factory's station coordinating voltage control method based on the coordination constraint real-time update of proposition, its control flow specifically may further comprise the steps as shown in Figure 2:

1) the voltage control zone is made up of m power plant and n transformer station, chooses the voltage vector V of transformer station's side monitoring bus _sAs the coordination variable between power plant and the transformer station, when a control cycle begins, gather the current numerical value V of coordination variable in real time _s ^Cur

2) utilize " the nine districts figure " Expert Rules that pre-establishes, obtain i transformer station (n, n are natural number for i=1 ..) the switching sequence of capacity reactance device and the controlled quentity controlled variable of on-load transformer tap changer; 3) i transformer station of real-time update (i=1 .., n) coordination variable

Lower limit

And the upper limit The lower limit and the upper limit of the coordination variable of all n transformer station in the described voltage control zone are gathered, obtain coordination variable in the described voltage control zone restriction range (abbreviation coordination constraint) [ V' _s, V ' _s];

4) make up the coordination secondary voltage control model in described voltage control zone, find the solution the idle regulated quantity Δ Q of Power Plant Side generator _gIt is as follows to coordinate the secondary voltage control model:

$\underset{{\mathrm{\ΔQ}}_g}{\min }{\left|\right|(V_p-V_p^{\mathrm{ref}})+C_{\mathrm{pg}}{\mathrm{\ΔQ}}_g\left|\right|}^2+{\left|\right|(V_s-V_s^{\mathrm{ref}})+C_{\mathrm{sg}}\mathrm{\Δ}{Q}_g\left|\right|}^2$

s.t. V _p≤V _p+C _pgΔQ _g≤V _p

V′ _s≤V _s+C _sgΔQ _g≤V′ _s

Q _g≤Q _g+ΔQ _g≤Q _g

Δ Q wherein _gBeing the variable quantity vector that generator reactive is exerted oneself, is control variables, V _pAnd Q _gBe respectively that power plant's high-voltage side bus voltage vector and generator reactive go out force vector, V _pAnd V _pRepresent the high-voltage side bus voltage vector V of power plant respectively _pThe lower limit and the upper limit, Q _gAnd Q _gRepresent that respectively generator reactive goes out force vector Q _gThe lower limit and the upper limit, C _Pg, C _SgBe respectively Δ Q _gTo V _pAnd V _sSensitivity matrix; V _p ^RefAnd V _s ^RefRepresenting the optimization set point of Power Plant Side bus and transformer station's side bus voltage respectively, is known quantity;

5) according to step 2) the switching sequence of the capacity reactance device that obtains and the controlled quentity controlled variable of on-load transformer tap changer, realize closed-loop adjustment to each transformer station's control appliance (discrete variable) of described voltage control zone; The idle regulated quantity of the Power Plant Side that obtains according to step 4), exert oneself to each power plant is idle in described voltage control zone (continuous variable) realizes closed-loop adjustment;

(6) when control cycle arrival next time, return step 1).

At i transformer station's coordination variable of step 3) real-time update

Lower limit

And the upper limit

Concrete grammar be:

Note Current magnitude of voltage be

, determine to guarantee that according to the operation of power networks guide rule electrical network normally moves The range of operation that should satisfy

, the current capacity minimum capacity that drops into (or the minimum reactance of resectable capacity) capacity is Q _i ^Inc, current resectable capacity minimum capacity (the minimum reactance of the capacity that maybe can drop into) capacity is Q _i ^Dec, it is right that electric capacity (reactance) articulates the idle injection of node

Sensitivity be , then according to the following regular coordination constraint that calculates i transformer station

(1) Ruo Ben transformer station has capacitor to put into operation, then ${\underset{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}},{\stackrel{\‾}{V}}_{s_i}^{\′}=\min ({\stackrel{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}+C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{inc}});$

(2) Ruo Ben transformer station has reactor to put into operation, then ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}}),{\stackrel{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}};$

(3) Ruo Ben transformer station does not drop into any electric capacity or reactor, then ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}}),$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=\min ({\stackrel{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}+C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{inc}}).$

Below be an embodiment of the inventive method, specifically may further comprise the steps:

Step 1) voltage control zone is made up of m power plant and n transformer station, chooses the voltage vector V of transformer station's side monitoring bus _sAs the coordination variable between power plant and the transformer station, when a control cycle begins, gather the current numerical value V of coordination variable in real time _s ^CurV wherein _s ^CurReal-time data acquisition can be by control centre the telemetry function of automation system for the power network dispatching realize.

Step 2) utilizes " the nine districts figure " Expert Rules that pre-establishes, obtain i transformer station (i=1 .., n) the switching sequence of capacity reactance device and the controlled quentity controlled variable of on-load transformer tap changer;

For each transformer station, belong to existing mature technology based on transformer station's automatic voltage control method of nine district figure Expert Rules, partition scheme and Policy Table are respectively shown in Fig. 1 (b) and table 2.The data acquisition of this step and control realize by remote measurement, remote signalling, remote regulating and the distant control function of existing automation system for the power network dispatching;

I transformer station of step 3) real-time update (i=1 .., n) coordination variable Lower limit

And the upper limit The lower limit and the upper limit of the coordination variable of all n transformer station in the described voltage control zone are gathered, obtain coordination variable in the described voltage control zone restriction range (abbreviation coordination constraint) [ V' _s, V ' _s];

Note

Current magnitude of voltage be

, can determine to guarantee that according to the operation of power networks guide rule electrical network normally moves

The range of operation that should satisfy

, the current capacity minimum capacity that drops into (or the minimum reactance of resectable capacity) capacity is Q _i ^Inc(if do not had electric capacity that can drop into or the reactance that can withdraw from, then order this moment $Q_i^{\mathrm{inc}}=\∞$ ), current resectable capacity minimum capacity (the minimum reactance of the capacity that maybe can drop into) capacity is Q _i ^Dec(if do not had electric capacity that can withdraw from or the reactance that can drop into, then order this moment $Q_i^{\mathrm{dec}}=\∞$ ), it is right that electric capacity (reactance) articulates the idle injection of node

Sensitivity be

Find the solution [ V' _s, V ' _s] time, a kind of optional concrete grammar is a coordination constraint of determining i transformer station by the Expert Rules mode

, concrete grammar is:

(a) if in step 2) in this transformer station have capacitor to put into operation, then ${\underset{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}},$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=\min ({\stackrel{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}+C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{inc}});$

(b) if this transformer station has reactor to put into operation in step 2, then ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}}),$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}};$

(c) if in step 2) in this transformer station do not drop into any electric capacity or reactor, then ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}}),$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=\min ({\stackrel{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}+C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{inc}}).$

For example: the current magnitude of voltage of i transformer station's coordination variable $V_{s_i}^{\mathrm{cur}}=545\mathrm{kV},$ Determine according to the operation of power networks guide rule

The range of operation that should satisfy $[{\underset{\‾}{V}}_{s_i},{\stackrel{\‾}{V}}_{s_i}]=\left[\mathrm{500,550}\right]\mathrm{kV}.$ Suppose because voltage is higher, in step 2) in the existing reactor of i transformer station put into operation with reduction voltage.And the reactor capacity of the current capacity minimum that drops into is $Q_i^{\mathrm{dec}}=40\mathrm{Mvar},$ Can calculate by known new sensitivity method that reactor is idle exerts oneself to voltage

Sensitivity be 200V/Mvar, according to above-mentioned rule (b), it is as follows to make real-time update to coordination constraint: coordination variable Lower limit may be updated as ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}})=537\mathrm{kV},$ The upper limit is updated to ${\stackrel{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}}=545\mathrm{kV}.$ Obviously after upgrading about coordination variable Constraints [537,545] narrower than former range of operation [500,550], the new constraints as in the coordination secondary voltage control model of step 4) is used for coordinating between transformer station and power plant.

Step 4) makes up the coordination secondary voltage control model in described voltage control zone, finds the solution the idle regulated quantity Δ Q of Power Plant Side generator _gIt is as follows to coordinate the secondary voltage control model:

$\underset{{\mathrm{\ΔQ}}_g}{\min }{\left|\right|(V_p-V_p^{\mathrm{ref}})+C_{\mathrm{pg}}{\mathrm{\ΔQ}}_g\left|\right|}^2+{\left|\right|(V_s-V_s^{\mathrm{ref}})+C_{\mathrm{sg}}\mathrm{\Δ}{Q}_g\left|\right|}^2$

s.t. V _p≤V _p+C _pgΔQ _g?≤V _p

V′ _s≤V _s+C _sgΔQ _g≤V′ _s

Q _g≤Q _g+ΔQ _g≤Q _g

Δ Q wherein _gBeing the variable quantity vector that generator reactive is exerted oneself, is control variables, V _pAnd Q _gBe respectively that power plant's high-voltage side bus voltage vector and generator reactive go out force vector, V _pAnd V _pRepresent the high-voltage side bus voltage vector V of power plant respectively _pThe lower limit and the upper limit, Q _gAnd Q _gRepresent that respectively generator reactive goes out force vector Q _gThe lower limit and the upper limit, C _Pg, C _SgBe respectively Δ Q _gTo V _pAnd V _sSensitivity matrix; The sensitivity method for solving adopts known new sensitivity method to provide.V _p ^RefAnd V _s ^RefRepresenting the optimization set point of Power Plant Side bus and transformer station's side bus voltage respectively, is known quantity;

Above-mentioned coordination secondary voltage control method belongs to mature technology, can find the solution by the collection method that works of routine.

Step 5) is according to step 2) the switching sequence of the capacity reactance device that obtains and the controlled quentity controlled variable of on-load transformer tap changer, realize closed-loop adjustment to each transformer station's control appliance (discrete variable) of described voltage control zone; The idle regulated quantity of the Power Plant Side that obtains according to step 4), exert oneself to each power plant is idle in described voltage control zone (continuous variable) realizes closed-loop adjustment;

Step 6) is returned step 1) when control cycle arrival next time.Usually control cycle can be set at 5 minutes.

Claims (2)

1, a kind of factory's station coordinating voltage control method based on the coordination constraint real-time update is characterized in that this method may further comprise the steps:

1) the voltage control zone is made up of m power plant and n transformer station, chooses the voltage vector V of transformer station's side monitoring bus _sAs the coordination variable between power plant and the transformer station, when a control cycle begins, gather the current numerical value V of coordination variable in real time _s ^Cur

2) utilize " the nine districts figure " Expert Rules that pre-establishes, obtain i transformer station, the switching sequence of capacity reactance device and the controlled quentity controlled variable of on-load transformer tap changer; Wherein, i=1 .., n, n are natural number;

3) i transformer station of real-time update, coordination variable

Lower limit

And the upper limit

The lower limit and the upper limit of the coordination variable of all n transformer station in the described voltage control zone are gathered, obtain coordination variable in the described voltage control zone restriction range [ V' _s, V ' _s];

4) make up the coordination secondary voltage control model in described voltage control zone, find the solution the idle regulated quantity Δ Q of Power Plant Side generator _gIt is as follows that this coordinates the secondary voltage control model:

$\underset{\mathrm{\Δ}{Q}_g}{\min }{\left|\right|(V_p-V_p^{\mathrm{ref}})+C_{\mathrm{pg}}\mathrm{\Δ}{Q}_g\left|\right|}^2+{\left|\right|(V_s-V_s^{\mathrm{ref}})+C_{\mathrm{sg}}\mathrm{\Δ}{Q}_g\left|\right|}^2$

s.t. V _p≤V _p+C _pgΔQ _g≤V _p

V′ _s≤V _s+C _sgΔQ _g≤V′ _s

Q _g≤Q _g+ΔQ _g≤Q _g

Δ Q wherein _gBeing the variable quantity vector that generator reactive is exerted oneself, is control variables, V _pAnd Q _gBe respectively that power plant's high-voltage side bus voltage vector and generator reactive go out force vector, V _pAnd V _pRepresent the high-voltage side bus voltage vector V of power plant respectively _pThe lower limit and the upper limit, Q _gAnd Q _gRepresent that respectively generator reactive goes out force vector Q _gThe lower limit and the upper limit, C _Pg, C _SgBe respectively Δ Q _gTo V _pAnd V _sSensitivity matrix; V _p ^RefAnd V _s ^RefRepresenting the optimization set point of Power Plant Side bus and transformer station's side bus voltage respectively, is known quantity;

5) according to step 2) the switching sequence of the capacity reactance device that obtains and the controlled quentity controlled variable of on-load transformer tap changer, realize closed-loop adjustment to each transformer station's control appliance of described voltage control zone; The idle regulated quantity of the Power Plant Side that obtains according to step 4) is to the idle realization closed-loop adjustment of exerting oneself of described voltage control each power plant of zone;

6) when control cycle arrival next time, return step 1).

2, factory as claimed in claim 1 station coordinating voltage control method is characterized in that, at i transformer station's coordination variable of described step 3) real-time update

Lower limit And the upper limit

Concrete grammar be:

Note

Current magnitude of voltage be

, determine to guarantee that according to the operation of power networks guide rule electrical network normally moves

The range of operation that should satisfy , the minimum reactance capacity of current capacity minimum capacity that drops into or resectable capacity is Q _i ^Inc, the minimum reactance capacity of the capacity that current resectable capacity minimum capacity maybe can drop into is Q _i ^Dec, it is right that electric capacity or reactance articulate the idle injection of node

Sensitivity be , then according to the following regular coordination constraint that calculates i transformer station

(1) Ruo Ben transformer station has capacitor to put into operation, then ${\underset{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}},$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=\min ({\stackrel{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}+C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{inc}});$

(2) Ruo Ben transformer station has reactor to put into operation, then ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}}),$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=V_{s_i}^{\mathrm{cur}};$

(3) Ruo Ben transformer station does not drop into any electric capacity or reactor, then ${\underset{\‾}{V}}_{s_i}^{\′}=\max ({\underset{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}-C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{dec}}),$ ${\stackrel{\‾}{V}}_{s_i}^{\′}=\min ({\stackrel{\‾}{V}}_{s_i},V_{s_i}^{\mathrm{cur}}+C_{{\mathrm{sc}}_i}{Q}_i^{\mathrm{inc}}).$

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