CN105896550A - Monitoring method of intelligent reactive power compensation system - Google Patents

Monitoring method of intelligent reactive power compensation system Download PDF

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Publication number
CN105896550A
CN105896550A CN201610394962.9A CN201610394962A CN105896550A CN 105896550 A CN105896550 A CN 105896550A CN 201610394962 A CN201610394962 A CN 201610394962A CN 105896550 A CN105896550 A CN 105896550A
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China
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trt
grid
correspondence
voltage
connected point
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靖新宇
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Chengdu Xinweibao Technology Co Ltd
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Chengdu Xinweibao Technology Co Ltd
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Priority to CN201610394962.9A priority Critical patent/CN105896550A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a monitoring method of an intelligent reactive power compensation system. The method comprises the following steps: S1, a monitoring device acquisition module acquires a voltage instruction issued by a large power grid dispatching center in real time, and extracts a target grid-connected point voltage of each power generation device from the voltage instruction; S2, a monitoring device receives a current grid-connected point voltage uploaded by each power generation device, and compares the current grid-connected point voltage with a preset interval; S3, the monitoring device controls the power generation device to enter a local control mode if the current grid-connected point voltage is in a normal operation interval; S4, the monitoring device controls the power generation device and a static var compensator (SVC) corresponding to the power generation device to enter a coordinated control mode if the current grid-connected point voltage is in an abnormal operation interval; and S5, the monitoring device controls the power generation device in an emergency operation interval and the SVC corresponding to the power generation device to enter an emergency control mode if the current grid-connected point voltage is in an emergency operation interval. By the method, the smooth grid-connected power and voltage can be achieved, and the economical operation of a clean energy power generation device is maintained and improved.

Description

A kind of monitoring method of intelligent powerless compensation system
Art
The present invention relates to a kind of monitoring method of intelligent powerless compensation system.
Background technology
Along with China's power system equipment development and strategic demand, distance, on a large scale, high-tension superelevation Pressure and UHV transmission network gradually form, and as the voltage matter of the safety and economic operation important indicator weighing power network Amount, is caused the material impact of active power loss by the unconventional conveying of reactive power source.Reactive power compensation is power system Middle application reactive power regulation measure improves power system reactive power distribution and voltage levvl, thus reduce between area power grid loss and The method of power transmission and transformation line power attenuation.Therefore, in power system, reactive power compensating apparatus and device have extremely important Effect, distributes compensation equipment and device rationally, not only can reduce grid loss, improves power supply quality, moreover it is possible to effectively solve be System voltage pulsation and the problem of harmonic wave.
Along with the fast development of clean energy resource, the extensive concentration of wind-powered electricity generation is accessed the electrical network higher requirement of proposition.Disliking In the case of bad environment or operation constraints increase, line voltage, three-phase imbalance, current distortion and power factor are on the low side Can loom large etc. problem, the level of security of TRT can reduce step by step.It is in electrical network that flexible AC controls SVC in device Most widely used general, the most ripe idle and voltage control apparatus, can quick compensating reactive power and maintenance line voltage.
A kind of method of traditional compensation harmonic and reactive current is installing reactive-load compensation equipment, generally by electric capacitor Device, reactor and resistor string parallel combination form.The Reactive-power control equipment that China is conventional at present is still mechanical type parallel reactance Device, switched capacitor, these silent oscillation pressure regulation means, because regulation is discontinuous, response speed is slow, it is difficult to meet system operation mode Demand during Rapid Variable Design.
Summary of the invention
The present invention provides a kind of monitoring method of intelligent powerless compensation system, and the method can be by clean energy resource generating dress Put and monitor in the lump with SVC equipment, and regulate reactive-load compensation as information source dynamic and intelligent, thus realize smooth and site power And voltage, maintain the economical operation improving clean energy resource TRT.
To achieve these goals, the present invention provides a kind of monitoring method of intelligent powerless compensation system, and the method includes Following steps:
S1. supervising device acquisition module obtains the voltage instruction that bulk power grid control centre issues in real time, and from voltage instruction The grid-connected point voltage of target of each TRT of middle extraction, the grid-connected point voltage of target of the most each TRT is identical;
S2. supervising device receives the current grid-connected point voltage that each TRT is uploaded, and by current grid-connected point voltage with pre- If interval compares, detect the interval at current grid-connected point voltage place, whole TRTs are detected it respectively the most grid-connected The pre-set interval at point voltage place, to determine the control model of correspondence;
If the most current grid-connected point voltage is in properly functioning interval, supervising device controls this TRT and enters this locality Control model, and issue the grid-connected point voltage of target, by reactive power compensation control to the SVC equipment of this TRT He its correspondence The grid-connected point voltage making this TRT reaches the grid-connected point voltage of target;Current grid-connected point voltage is in properly functioning interval, table Show that this TRT can be exported by own reactive, make grid-connected point voltage reach target voltage;
If the most current grid-connected point voltage to be in misoperation interval, supervising device control abnormal TRT and Corresponding SVC equipment enters coordinates control model, selects to assist TRT and corresponding SVC thereof to set according to reactive voltage sensitivity Standby, control described coordination TRT and corresponding SVC equipment output reactive power thereof, coordinate control model to assist control to be in The grid-connected point voltage of TRT reaches the grid-connected point voltage of target;It is interval that current grid-connected point voltage is in misoperation, indicate without Merit is not enough, grid-connected point voltage out-of-limit entrance misoperation district, is difficult to make grid-connected point voltage reach target by own reactive output Voltage, needs the assistance of other measures;
If the most current grid-connected point voltage is in urgent traffic coverage, supervising device controls to be in urgent traffic coverage TRT and SVC equipment thereof enter emergent control pattern, and machine is cut in employing, the mode of removal of load controls the grid-connected of this TRT Point voltage.
Preferably, above-mentioned pre-set interval divides according to the grid-connected point voltage of TRT, and properly functioning interval isMisoperation interval isOrUrgent traffic coverage is OrWherein, i represents the numbering of TRT, ViRepresenting the grid-connected point voltage of TRT, i represents and generates electricity that The numbering of value, Vi represents the grid-connected point voltage of TRT,
Preferably, according to the interval residing for current grid-connected point voltage of TRT, can be by TRT and correspondence thereof The control of SVC equipment be divided into following three kinds of control models:
(1) local control model: now the grid-connected point voltage of TRT is in properly functioning interval, TRT and right The SVC equipment answered performs the voltage instruction that supervising device issues;
(2) control model is coordinated: now to be in misoperation interval for the grid-connected point voltage of TRT, TRT and right The SVC equipment answered performs the idle adjustment instruction that supervising device issues, and the regional power grid for TRT place provides idle Hold, until all TRTs and corresponding SVC equipment thereof are in local control model;
(3) emergent control pattern: now the grid-connected point voltage of TRT is in the voltage of urgent traffic coverage, i.e. wind energy turbine set Control through this locality and coordinate to control still to can not get there is efficient recovery, deteriorate further and enter urgent traffic coverage, now should be right The SVC equipment of TRT and correspondence thereof carries out emergent control.
Preferably, under local control model, the SVC equipment of TRT and correspondence thereof receives supervising device and issues also Site voltage-target, and monitor the actual value of the current grid-connected point voltage of TRT in real time, obtain desired value and actual value Difference, on the basis of the grid-connected point voltage ensureing TRT follows the tracks of target voltage, makes the SVC's of TRT and correspondence thereof Builtin voltage obtains optimum.
Preferably, when the idle deficiency of the SVC equipment of certain TRT and correspondence thereof, its out-of-limit entrance of grid-connected point voltage is different Often during traffic coverage, the SVC equipment of this TRT and correspondence thereof enters coordinates control model, by the Adjustable Capacity of this SVC equipment Amount is uploaded to supervising device, and supervising device is according to the nothing of the SVC equipment of reactive voltage sensitivity and each TRT and correspondence thereof Merit variable capacity selects TRT and the SVC equipment of correspondence thereof participating in coordinating to control, by out-of-limit TRT and correspondence thereof The voltage deviation value of SVC equipment calculate the idle adjustment amount of the SVC equipment coordinating TRT and correspondence thereof, then issue Idle adjustment amount is to coordinating TRT and the SVC equipment of correspondence thereof.
Preferably, choosing of the SVC equipment of coordination TRT and correspondence thereof, control target full at region interior nodes voltage Foot requires and is optimized, and due to the randomness of clean energy resource, meritorious the exerting oneself of TRT cluster can be continually changing, and so can The grid-connected point voltage of each TRT is caused ceaselessly to fluctuate, carrying out Load flow calculation when, for TRT cluster For high-tension line, its reactance value often much larger than its resistance value, can obtain according to PQ decomposition method:
Δ Q=-VB " Δ V (1)
In formula (1), Δ Q is TRT the reactive power changing value of site output;B is " for circuit in TRT cluster Admittance matrix, matrix's reversibility, matrix belongs to sparse type matrix;V=diag (V1,V2,...,Vn) represent TRT machine end electricity Pressure, total n node;Δ V is each node voltage variable quantity of region.Can be obtained by formula (1):
Δ V=-(B ")-1V-1ΔQ (2)
The then SVC equipment of all TRTs and correspondence thereof the generating to being in coordination control model in TRT cluster The reactive voltage sensitivity coefficient matrix S of the SVC equipment of device and correspondence thereof is:
S=-(B ")-1V-1 (3)
Element S in reactive voltage sensitivity coefficient matrix S in formula (3)ijGrid-connected point voltage change for TRT i is right The sensitivity coefficient that also site reactive power changes of TRT j, its size and TRT node voltage value and network knot Structure relating to parameters;SiiFor TRT voltage, TRT is adjusted idle sensitivity.
Preferably, the selection gist of the SVC equipment coordinating TRT and correspondence thereof is the SVC of TRT and correspondence thereof Equipment is the size of numerical value in sensitivity coefficient matrix, the preferential substation selecting sensitivity big, concrete, can be by reactive voltage Sensitivity coefficient S in sensitivity coefficient matrix SijAccording to being ranked up from big to small, and selected and sorted is in sensitivity above TRT corresponding to coefficient and the SVC equipment of correspondence thereof are as coordinating TRT and the SVC equipment of correspondence thereof.
Preferably, step S4 controls the SVC equipment output reactive power of described coordination TRT and correspondence thereof, with association The grid-connected point voltage helping the SVC equipment controlling TRT and the correspondence thereof being in coordination control model reaches target site electricity Pressure may include that according to be in the current grid-connected point voltage of the SVC equipment coordinating the TRT of control model and correspondence thereof with The difference of the grid-connected point voltage of target, the SVC equipment calculating described coordination TRT and correspondence thereof needs the idle adjustment of offer Amount;SVC equipment to described coordination TRT and correspondence thereof issues the idle coordination control instruction carrying idle adjustment amount, The SVC equipment of described coordination TRT and correspondence thereof, according to idle adjustment amount output reactive power, makes to be in coordination and controls mould The grid-connected point voltage of the TRT of formula and the SVC equipment of correspondence thereof reaches the grid-connected point voltage of target;Wherein, TRT is coordinated And after the SVC equipment of correspondence is according to idle adjustment amount output reactive power, coordinate TRT and the SVC equipment pair of correspondence thereof The grid-connected point voltage of the wind energy turbine set answered is in properly functioning interval.
Preferably, below equation can be used to calculate the idle adjustment amount Δ Q coordinating AVC substation ii:
ΔVj=S Δ Qi (4)
In formula (4), Δ VjFor being in the most grid-connected of the SVC equipment j of TRT and the correspondence thereof coordinating control model Point voltage and the difference (the voltage deviation amount of the most out-of-limit substation) of the grid-connected point voltage of target;It is handed down to coordinate TRT and right The idle adjustment amount of the SVC equipment i answered should be in the range of the variable capacity coordinating AVC substation i;
Constraints is as follows:
1) the idle adjustment amount Δ Q that supervising device issues to the SVC equipment of TRT and correspondence thereofiShould be at TRT And variable capacity scope Q of the SVC equipment of correspondenceavaIn:
0<ΔQi<Qava (5)
2) after the SVC equipment adjustment of TRT and correspondence thereof is idle, the SVC equipment voltage of TRT and correspondence thereof Vi newShould be maintained in permission range of operation:
Vi new=Vi old+ΔQiSii (6)
V i - min I < V i n e w < V i - max I - - - ( 7 ) .
Present invention have the advantage that (1) can find grid-connected by monitoring TRT and SVC equipment in the lump in time Point voltage undulating value, and as information source dynamic reactive power, thus it is stable to realize grid-connected point voltage;(2) for also site Voltage presets traffic coverage, corresponding different control model, assists bulk power grid control centre jointly to complete clean energy resource and generates electricity The control of device, coordinates to control the idle of each TRT and exerts oneself, on the basis of reducing reactive reserve, it is ensured that voltage keeps Stable, improve area voltage levvl.
Accompanying drawing explanation
Fig. 1 shows the block diagram of a kind of intelligent powerless compensation system of the present invention;
Fig. 2 shows the flow chart of a kind of monitoring method of intelligent powerless compensation system.
Detailed description of the invention
Fig. 1 shows a kind of intelligent powerless compensation system 10 of the present invention, and this intelligent powerless compensation system 10 includes: send out Electric installation 12, for green energy resource is converted into electric energy, this clean energy resource TRT 12 is multiple;SVC equipment 13, is used for The also site of TRT provides reactive power, and to maintain stablizing of grid-connected voltage, this SVC equipment 13 is multiple, and with described TRT 12 one_to_one corresponding;Grid-connecting apparatus 14, for realizing being incorporated into the power networks between TRT and bulk power grid;With monitoring dress Put 11.
This supervising device 11 includes: acquisition module 112, detection module 113, control module 114 and for described each module The communication bus 111 of communication;
Described acquisition module 112, for receiving the voltage instruction that described bulk power grid 20 control centre issues, and from described electricity Grid-connected point voltage is extracted in end finger order;
Described detection module 113, is used for receiving current grid-connected point voltage, and by described current grid-connected point voltage and preset areas Between compare, detect the interval at described current grid-connected point voltage place.
Described control module 114, in the case of described current grid-connected point voltage is in properly functioning interval, controls The SVC equipment of this TRT and correspondence thereof enters local control model, and to the SVC equipment of described TRT and correspondence thereof Issue the grid-connected point voltage of described target, control described grid-connected point voltage by reactive power compensation and reach described target site electricity Pressure;
In the case of described current grid-connected point voltage is in misoperation interval, control this exception TRT and right The SVC equipment answered enters coordinates control model, according to reactive voltage sensitivity and, select to coordinate TRT and correspondence thereof SVC equipment, controls the SVC equipment output reactive power of described coordination TRT and correspondence thereof, to assist control to be in coordination The grid-connected point voltage of the SVC equipment of control model exception TRT and correspondence thereof reaches the grid-connected point voltage of described target;And In the case of described current grid-connected point voltage is in urgent traffic coverage, control this TRT being in urgent traffic coverage And the SVC equipment of correspondence enters emergent control pattern, machine is cut in employing or removal of load mode controls this grid-connected point voltage.
Preferably, described control module includes: the first control unit, is used for using below equation to calculate all TRTs For being in the reactive voltage sensitivity coefficient matrix S:S=-(B ") coordinating control model TRT-1V-1, wherein, idle Element S in voltage sensibility coefficient matrix SijFor TRT i grid-connected point voltage change to TRT j and site without The sensitivity coefficient that merit power changes;B is " for the admittance matrix of circuit, matrix's reversibility in described TRT cluster;V=diag (V1,V2,...,Vn) represent the set end voltage of TRT, total n node;By in reactive voltage sensitivity coefficient matrix S Sensitivity coefficient SijAccording to being ranked up from big to small;Selected and sorted at the TRT corresponding to sensitivity coefficient above and Its SVC equipment is as described coordination TRT and SVC equipment thereof.
Preferably, described control module includes: the second control unit, for according to being in coordination control model TRT And the difference of the current grid-connected point voltage of SVC equipment and the grid-connected point voltage of described target, calculate described coordination TRT and Its SVC equipment needs the idle adjustment amount provided;Issue to described coordination TRT and SVC equipment thereof carry described idle The idle coordination control instruction of adjustment amount, described coordination TRT and SVC equipment thereof export nothing according to described idle adjustment amount Merit power, makes the grid-connected point voltage being in the TRT and SVC equipment thereof of coordinating control model reach described target site Voltage;Wherein, after described coordination TRT and SVC equipment thereof are according to described idle adjustment amount output reactive power, present The grid-connected point voltage coordinating control model TRT and wind energy turbine set corresponding to SVC equipment thereof is in properly functioning interval.
Preferably, described control module includes: the 3rd control unit, for when being in emergent control pattern, issues nothing Merit regulating command is given after being in emergent control pattern TRT or SVC equipment, and detection reaches deliberate action delay time, controls Machine of cutting when being in emergent control pattern, removal of load, wherein, described deliberate action delay time be more than described in be in emergent control The TRT of pattern or the action cycle of SVC equipment, the described action cycle be from described be in emergent control pattern time issue Reactive-power control instructs TRT or the time of SVC equipment execution action;Wherein, if grid-connected point voltage in the given time Always above the peak set, confirming that reactive power compensation planning is used up, grid-connecting apparatus cut-out is incorporated into the power networks with bulk power grid.
Preferably, the inverter circuit that main circuit is three-phase three brachium pontis of described SVC equipment, by 6 power electronic devices and DC bus capacitor forms.
Preferably, described SVC equipment uses the modulation system of space vector of voltage, for the ease of straight in alpha-beta coordinate system Connect control, the voltage pulsation caused when reducing switching switch, control SVC output voltage vector in orthohexagonal inscribed circle, Inscribed circle radius isudcRepresent the DC capacitor voltage of SVC.
Seeing accompanying drawing 2, the monitoring method of a kind of intelligent powerless compensation system of the present invention comprises the steps:
S1. supervising device acquisition module obtains the voltage instruction that bulk power grid control centre issues in real time, and from voltage instruction The grid-connected point voltage of target of each TRT of middle extraction, the grid-connected point voltage of target of the most each TRT is identical;
S2. supervising device receives the current grid-connected point voltage that each TRT is uploaded, and by current grid-connected point voltage with pre- If interval compares, detect the interval at current grid-connected point voltage place, whole TRTs are detected it respectively the most grid-connected The pre-set interval at point voltage place, to determine the control model of correspondence;
If the most current grid-connected point voltage is in properly functioning interval, supervising device controls this TRT and enters this locality Control model, and issue the grid-connected point voltage of target, by reactive power compensation control to the SVC equipment of this TRT He its correspondence The grid-connected point voltage making this TRT reaches the grid-connected point voltage of target;Current grid-connected point voltage is in properly functioning interval, table Show that this TRT can be exported by own reactive, make grid-connected point voltage reach target voltage;
If the most current grid-connected point voltage to be in misoperation interval, supervising device control abnormal TRT and Corresponding SVC equipment enters coordinates control model, selects to assist TRT and corresponding SVC thereof to set according to reactive voltage sensitivity Standby, control described coordination TRT and corresponding SVC equipment output reactive power thereof, coordinate control model to assist control to be in The grid-connected point voltage of TRT reaches the grid-connected point voltage of target;It is interval that current grid-connected point voltage is in misoperation, indicate without Merit is not enough, grid-connected point voltage out-of-limit entrance misoperation district, is difficult to make grid-connected point voltage reach target by own reactive output Voltage, needs the assistance of other measures;
If the most current grid-connected point voltage is in urgent traffic coverage, supervising device controls to be in urgent traffic coverage TRT and SVC equipment thereof enter emergent control pattern, and machine is cut in employing, the mode of removal of load controls the grid-connected of this TRT Point voltage.
Preferably, above-mentioned pre-set interval divides according to the grid-connected point voltage of TRT, and properly functioning interval isMisoperation interval isOrUrgent traffic coverage isOrWherein, i represents the numbering of TRT, ViRepresenting the grid-connected point voltage of TRT, i represents that value that generates electricity Numbering, Vi represents the grid-connected point voltage of TRT,Demarcation interval can make full use of each The voltage regulation capability of electric installation self, contributes to output reactive power and and the site according to different modes to TRT Voltage control effectively, and improves efficiency.
Preferably, according to the interval residing for current grid-connected point voltage of TRT, can be by TRT and correspondence thereof The control of SVC equipment be divided into following three kinds of control models:
(1) local control model: now the grid-connected point voltage of TRT is in properly functioning interval, TRT and right The SVC equipment answered performs the voltage instruction that supervising device issues;
(2) control model is coordinated: now to be in misoperation interval for the grid-connected point voltage of TRT, TRT and right The SVC equipment answered performs the idle adjustment instruction that supervising device issues, and the regional power grid for TRT place provides idle Hold, until all TRTs and corresponding SVC equipment thereof are in local control model;
(3) emergent control pattern: now the grid-connected point voltage of TRT is in the voltage of urgent traffic coverage, i.e. wind energy turbine set Control through this locality and coordinate to control still to can not get there is efficient recovery, deteriorate further and enter urgent traffic coverage, now should be right The SVC equipment of TRT and correspondence thereof carries out emergent control.
Preferably, under local control model, the SVC equipment of TRT and correspondence thereof receives supervising device and issues also Site voltage-target, and monitor the actual value of the current grid-connected point voltage of TRT in real time, obtain desired value and actual value Difference, on the basis of the grid-connected point voltage ensureing TRT follows the tracks of target voltage, makes the SVC's of TRT and correspondence thereof Builtin voltage obtains optimum.
Preferably, when the idle deficiency of the SVC equipment of certain TRT and correspondence thereof, its out-of-limit entrance of grid-connected point voltage is different Often during traffic coverage, the SVC equipment of this TRT and correspondence thereof enters coordinates control model, by the Adjustable Capacity of this SVC equipment Amount is uploaded to supervising device, and supervising device is according to the nothing of the SVC equipment of reactive voltage sensitivity and each TRT and correspondence thereof Merit variable capacity selects TRT and the SVC equipment of correspondence thereof participating in coordinating to control, by out-of-limit TRT and correspondence thereof The voltage deviation value of SVC equipment calculate the idle adjustment amount of the SVC equipment coordinating TRT and correspondence thereof, then issue Idle adjustment amount is to coordinating TRT and the SVC equipment of correspondence thereof.
Preferably, choosing of the SVC equipment of coordination TRT and correspondence thereof, control target full at region interior nodes voltage Foot requires and is optimized, and due to the randomness of clean energy resource, meritorious the exerting oneself of TRT cluster can be continually changing, and so can The grid-connected point voltage of each TRT is caused ceaselessly to fluctuate, carrying out Load flow calculation when, for TRT cluster For high-tension line, its reactance value often much larger than its resistance value, can obtain according to PQ decomposition method:
Δ Q=-VB " Δ V (1)
In formula (1), Δ Q is TRT the reactive power changing value of site output;B is " for circuit in TRT cluster Admittance matrix, matrix's reversibility, matrix belongs to sparse type matrix;V=diag (V1,V2,...,Vn) represent TRT machine end electricity Pressure, total n node;Δ V is each node voltage variable quantity of region.Can be obtained by formula (1):
Δ V=-(B ")-1V-1ΔQ (2)
The then SVC equipment of all TRTs and correspondence thereof the generating to being in coordination control model in TRT cluster The reactive voltage sensitivity coefficient matrix S of the SVC equipment of device and correspondence thereof is:
S=-(B ")-1V-1 (3)
Element S in reactive voltage sensitivity coefficient matrix S in formula (3)ijGrid-connected point voltage change for TRT i is right The sensitivity coefficient that also site reactive power changes of TRT j, its size and TRT node voltage value and network knot Structure relating to parameters;SiiFor TRT voltage, TRT is adjusted idle sensitivity.
Preferably, the selection gist of the SVC equipment coordinating TRT and correspondence thereof is the SVC of TRT and correspondence thereof Equipment is the size of numerical value in sensitivity coefficient matrix, the preferential substation selecting sensitivity big, concrete, can be by reactive voltage Sensitivity coefficient S in sensitivity coefficient matrix SijAccording to being ranked up from big to small, and selected and sorted is in sensitivity above TRT corresponding to coefficient and the SVC equipment of correspondence thereof are as coordinating TRT and the SVC equipment of correspondence thereof.
Preferably, step S4 controls the SVC equipment output reactive power of described coordination TRT and correspondence thereof, with association The grid-connected point voltage helping the SVC equipment controlling TRT and the correspondence thereof being in coordination control model reaches target site electricity Pressure may include that according to be in the current grid-connected point voltage of the SVC equipment coordinating the TRT of control model and correspondence thereof with The difference of the grid-connected point voltage of target, the SVC equipment calculating described coordination TRT and correspondence thereof needs the idle adjustment of offer Amount;SVC equipment to described coordination TRT and correspondence thereof issues the idle coordination control instruction carrying idle adjustment amount, The SVC equipment of described coordination TRT and correspondence thereof, according to idle adjustment amount output reactive power, makes to be in coordination and controls mould The grid-connected point voltage of the TRT of formula and the SVC equipment of correspondence thereof reaches the grid-connected point voltage of target;Wherein, TRT is coordinated And after the SVC equipment of correspondence is according to idle adjustment amount output reactive power, coordinate TRT and the SVC equipment pair of correspondence thereof The grid-connected point voltage of the wind energy turbine set answered is in properly functioning interval.
Preferably, below equation can be used to calculate the idle adjustment amount Δ Q coordinating AVC substation ii:
ΔVj=S Δ Qi (4)
In formula (4), Δ VjFor being in the most grid-connected of the SVC equipment j of TRT and the correspondence thereof coordinating control model Point voltage and the difference (the voltage deviation amount of the most out-of-limit substation) of the grid-connected point voltage of target;It is handed down to coordinate TRT and right The idle adjustment amount of the SVC equipment i answered should be in the range of the variable capacity coordinating AVC substation i;
Constraints is as follows:
1) the idle adjustment amount Δ Q that supervising device issues to the SVC equipment of TRT and correspondence thereofiShould be at TRT And variable capacity scope Q of the SVC equipment of correspondenceavaIn:
0<ΔQi<Qava (5)
2) after the SVC equipment adjustment of TRT and correspondence thereof is idle, the SVC equipment voltage of TRT and correspondence thereof Vi newShould be maintained in permission range of operation:
Vi new=Vi old+ΔQiSii (6)
V i - min I < V i n e w < V i - max I - - - ( 7 ) .
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, On the premise of present inventive concept, make some equivalents and substitute or obvious modification, and performance or purposes are identical, all should It is considered as belonging to protection scope of the present invention.

Claims (9)

1. a monitoring method for intelligent powerless compensation system, the method comprises the steps:
S1. supervising device acquisition module obtains the voltage instruction that bulk power grid control centre issues in real time, and carries from voltage instruction Taking the grid-connected point voltage of target of each TRT, the grid-connected point voltage of target of the most each TRT is identical;
S2. supervising device receives the current grid-connected point voltage that each TRT is uploaded, and by current grid-connected point voltage and preset areas Between compare, detect the interval at current grid-connected point voltage place, whole TRTs detected respectively its current and site electricity The pre-set interval at pressure place, to determine the control model of correspondence;
If the most current grid-connected point voltage is in properly functioning interval, supervising device controls this TRT and enters this locality control Pattern, and issue the grid-connected point voltage of target to the SVC equipment of this TRT He its correspondence, being controlled by reactive power compensation should The grid-connected point voltage of TRT reaches the grid-connected point voltage of target;Current grid-connected point voltage is in properly functioning interval, and representing should TRT can be exported by own reactive, makes grid-connected point voltage reach target voltage;
If it is interval that the most current grid-connected point voltage is in misoperation, supervising device controls abnormal TRT and correspondence thereof SVC equipment enters coordinates control model, selects to assist TRT and corresponding SVC equipment, control according to reactive voltage sensitivity Make described coordination TRT and corresponding SVC equipment output reactive power thereof, coordinate the generating of control model to assist control to be in The grid-connected point voltage of device reaches the grid-connected point voltage of target;It is interval that current grid-connected point voltage is in misoperation, represent idle not Foot, grid-connected point voltage out-of-limit entrance misoperation district, it is difficult to make grid-connected point voltage reach target voltage by own reactive output, Need the assistance of other measures;
If the most current grid-connected point voltage is in urgent traffic coverage, supervising device controls to be in the generating of urgent traffic coverage Device and SVC equipment thereof enter emergent control pattern, use and cut machine, the mode of removal of load controls this TRT and site electricity Pressure.
2. the method for claim 1, it is characterised in that above-mentioned pre-set interval is carried out according to the grid-connected point voltage of TRT Dividing, properly functioning interval isMisoperation interval isOr Urgent traffic coverage isOrWherein, i represents the numbering of TRT, ViRepresent TRT site Voltage, i represents the numbering of that value that generates electricity, and Vi represents the grid-connected point voltage of TRT,
3. method as claimed in claim 2, it is characterised in that according to the district residing for current grid-connected point voltage of TRT Between, the control of the SVC equipment of TRT and correspondence thereof can be divided into following three kinds of control models:
(1) local control model: now the grid-connected point voltage of TRT is in properly functioning interval, TRT and correspondence thereof SVC equipment performs the voltage instruction that supervising device issues;
(2) control model is coordinated: now the grid-connected point voltage of TRT is in misoperation interval, TRT and correspondence thereof SVC equipment performs the idle adjustment instruction that supervising device issues, and the regional power grid for TRT place provides reactive power support, directly It is in local control model to all TRTs and corresponding SVC equipment thereof;
(3) emergent control pattern: now the grid-connected point voltage of TRT is in the voltage process of urgent traffic coverage, i.e. wind energy turbine set Local control and coordination control still to can not get there is efficient recovery, deteriorate the urgent traffic coverage of entrance further, now should be to generating The SVC equipment of device and correspondence thereof carries out emergent control.
4. method as claimed in claim 3, it is characterised in that under local control model, TRT and the SVC of correspondence thereof Equipment receives the grid-connected point voltage desired value that supervising device issues, and monitors the reality of the current grid-connected point voltage of TRT in real time Value, obtains the difference of desired value and actual value, on the basis of the grid-connected point voltage ensureing TRT follows the tracks of target voltage, makes The builtin voltage of the SVC of TRT and correspondence thereof obtains optimum.
5. method as claimed in claim 4, it is characterised in that when the idle deficiency of SVC equipment of certain TRT and correspondence thereof Time, during its grid-connected point voltage out-of-limit entrance misoperation interval, the SVC equipment of this TRT and correspondence thereof enters to be coordinated to control Pattern, is uploaded to supervising device by the variable capacity of this SVC equipment, and supervising device fills according to reactive voltage sensitivity and each generating Put and correspondence SVC equipment idle variable capacity select participate in coordinate control TRT and the SVC equipment of correspondence, The SVC being calculated coordination TRT and correspondence thereof by the voltage deviation value of the SVC equipment of out-of-limit TRT and correspondence thereof sets Standby idle adjustment amount, then issues idle adjustment amount to coordinating TRT and the SVC equipment of correspondence thereof.
6. method as claimed in claim 5, it is characterised in that choosing of the SVC equipment of coordination TRT and correspondence thereof, control Target processed meets requirement at region interior nodes voltage and is optimized, due to the randomness of clean energy resource, TRT cluster Gain merit and exert oneself and can be continually changing, the grid-connected point voltage of each TRT so can be caused ceaselessly to fluctuate, carrying out Load flow calculation When, for the high-tension line of TRT cluster, its reactance value is often much larger than its resistance value, according to PQ decomposition method Can obtain:
Δ Q=-VB " Δ V (1)
In formula (1), Δ Q is TRT the reactive power changing value of site output;B is " for the leading of circuit in TRT cluster Receiving matrix, matrix's reversibility, matrix belongs to sparse type matrix;V=diag (V1,V2,...,Vn) represent TRT set end voltage, Total n node;Δ V is each node voltage variable quantity of region.Can be obtained by formula (1):
Δ V=-(B ")-1V-1ΔQ (2)
The then SVC equipment of all TRTs and correspondence thereof the TRT to being in coordination control model in TRT cluster And the reactive voltage sensitivity coefficient matrix S of the SVC equipment of correspondence is:
S=-(B ")-1V-1 (3)
Element S in reactive voltage sensitivity coefficient matrix S in formula (3)ijGrid-connected point voltage for TRT i changes generating The sensitivity coefficient that also site reactive power changes of device j, its size and TRT node voltage value and network structure ginseng Number is relevant;SiiFor TRT voltage, TRT is adjusted idle sensitivity.
7. method as claimed in claim 6, it is characterised in that the selection of the SVC equipment coordinating TRT and correspondence thereof depends on According to being SVC equipment size of numerical value in sensitivity coefficient matrix of TRT and correspondence thereof, preferential select sensitivity big Substation, concrete, can be by the sensitivity coefficient S in reactive voltage sensitivity coefficient matrix SijAccording to arranging from big to small Sequence, and selected and sorted the TRT corresponding to sensitivity coefficient above and correspondence thereof SVC equipment as coordinate generating The SVC equipment of device and correspondence thereof.
8. method as claimed in claim 7, it is characterised in that control described coordination TRT and correspondence thereof in step S4 SVC equipment output reactive power, to assist to control the SVC equipment of TRT and the correspondence thereof being in coordination control model also Site voltage reaches the grid-connected point voltage of target and may include that and coordinate the TRT of control model and correspondence thereof according to being in The difference of the current grid-connected point voltage of SVC equipment and the grid-connected point voltage of target, calculates described coordination TRT and correspondence thereof SVC equipment needs the idle adjustment amount provided;SVC equipment to described coordination TRT and correspondence thereof issue carry idle The idle coordination control instruction of adjustment amount, the SVC equipment of described coordination TRT and correspondence thereof exports according to idle adjustment amount Reactive power, makes the grid-connected point voltage being in the SVC equipment of the TRT of coordination control model and correspondence thereof reach target also Site voltage;Wherein, after the SVC equipment of coordination TRT and correspondence thereof is according to idle adjustment amount output reactive power, coordinate The grid-connected point voltage of the wind energy turbine set that the SVC equipment of TRT and correspondence thereof is corresponding is in properly functioning interval.
9. method as claimed in claim 8, it is characterised in that below equation can be used to calculate and coordinate the idle of AVC substation i Adjustment amount Δ Qi:
ΔVj=S Δ Qi (4)
In formula (4), Δ VjFor being in the current grid-connected point voltage of the SVC equipment j of TRT and the correspondence thereof coordinating control model The difference (the voltage deviation amount of the most out-of-limit substation) of point voltage grid-connected with target;It is handed down to coordinate TRT and correspondence thereof The idle adjustment amount of SVC equipment i should be in the range of the variable capacity coordinating AVC substation i;
Constraints is as follows:
1) the idle adjustment amount Δ Q that supervising device issues to the SVC equipment of TRT and correspondence thereofiShould at TRT and Variable capacity scope Q of corresponding SVC equipmentavaIn:
0<ΔQi<Qava (5)
2) after the SVC equipment adjustment of TRT and correspondence thereof is idle, the SVC equipment voltage V of TRT and correspondence thereofi newShould It is maintained in permission range of operation:
V i n e w = V i o l d + &Delta;Q i S i i - - - ( 6 )
V i - min I < V i n e w < V i - max I - - - ( 7 ) .
CN201610394962.9A 2016-06-03 2016-06-03 Monitoring method of intelligent reactive power compensation system Pending CN105896550A (en)

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CN106786625A (en) * 2016-12-20 2017-05-31 国网天津市电力公司 Distribution network voltage control method for coordinating based on distributing-supplying-energy system interaction capability
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