CN102231525A - Voltage quality control (VQC) system based on static var generator(SVG) and method thereof - Google Patents

Voltage quality control (VQC) system based on static var generator(SVG) and method thereof Download PDF

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CN102231525A
CN102231525A CN2011101765740A CN201110176574A CN102231525A CN 102231525 A CN102231525 A CN 102231525A CN 2011101765740 A CN2011101765740 A CN 2011101765740A CN 201110176574 A CN201110176574 A CN 201110176574A CN 102231525 A CN102231525 A CN 102231525A
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idle
power
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CN102231525B (en
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赵香花
陈远华
路永辉
鲁闯
李小兵
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SIEYUAN QINGNENG POWER ELECTRONIC Co Ltd
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SIEYUAN QINGNENG POWER ELECTRONIC Co Ltd
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    • 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
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    • 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

Abstract

The invention provides a voltage quality control (VQC) system based on a static var generator (SVG) and a method thereof in the voltage reactive power integration control technical field. The system comprises dynamic reactive power generators, a voltage reactive power automatic controller and fixed reactive compensation circuits. A plurality of dynamic reactive power generators and a plurality of fixed reactive compensation circuits are in parallel connection to connect with a bus connecting with an output terminal of an electric power system transformer, and output continuous capacitive reactive power and induction reactive power dynamically. An input terminal of the voltage reactive power automatic controller is connected with the dynamic reactive power generators and the fixed reactive compensation circuits respectively and outputs a control instruction. According to the invention, speed of static var integration controlled by the voltage quality control is raised.

Description

Voltage power-less automatic control system and method based on the dynamic reactive generator
Technical field
What the present invention relates to is the method in a kind of voltage power-less Comprehensive Control Technology field, specifically is that a kind of voltage power-less based on dynamic reactive generator (SVG) is controlled (VQC) system and method automatically.
Background technology
SVG (dynamic reactive generator, Static Var Generator) is development in recent years reactive power compensator comparatively rapidly, it mainly constitutes controlled voltage source inverter by power electronic device such as IGBT, can provide capacitive reactive power and lagging reactive power continuously apace for system.
Along with novel dynamic reactive generator SVG is widely used in the reactive power compensation on the spot of electrical network, needs fast SVG device and traditional VQC device to combine and coordinate control, to guarantee to regulate congruence.
Find through retrieval prior art, Chinese patent literature CN2678227, open day 2005-2-9, put down in writing a kind of voltage wattless automatic control device, this technology contains one and is used for detection, the control system that network system changes, form bucking-out system by voltage regulator, capacitor for one, detection, control system and bucking-out system are connected together, make voltage wattless automatic control device.
Chinese patent literature CN1655085, open day 2005-8-17, put down in writing a kind of programmable voltage wattless automatic control device based on formula, this technology comprises: the VQC control unit, this unit carries out exchanges data by real-time data base and formula operation unit, obtain and the output control command, this unit has the control output interface that is connected with controlling object; The formula operation unit, this unit carries out exchanges data by real-time data base and VQC control unit; Real-time data base, this database provides all required data of computing, described real-time data base is made of a series of memory, the information of its requirement is provided to VQC control unit and formula operation unit, this database is gathered the data of Be Controlled object, formation has multiple database of information, is the data source of system.This technology guarantees the busbar voltage quality and the reactive balance of transformer station in the electric power system as a voltage wattless automatic control device, and it possesses powerful programmable features, satisfies the demand for control of the changeable complexity of engineering site.
Chinese patent literature CN101515720, open day 2009-8-26, put down in writing a kind of centralized control impulse type voltage-wattless automatic control system in thermal power plant, this technology contains one and is used for detection, the control system that network system changes, form bucking-out system by voltage regulator, reactor for one, detection, control system and bucking-out system are connected together, make voltage wattless automatic control device.
But there is following deficiency in above-mentioned prior art:
1, regulation voltage and idle continuously: the controlling object that above-mentioned control system comprises is capacitor group, reactor group and transformer, and voltage is by gear change, idle capacity Discrete Change of pressing electric capacity or reactance, regulation voltage and idle continuously;
2, response speed is fast inadequately: for stability that guarantees to control and the useful life that prolongs equipment, usually require electric capacity, reactance can not frequently carry out switching, transformer can not frequently carry out the lifting shelves, and guaranteeing to have certain operating time at interval, any equipment all can not move again in the operating time interval.
3, generally adopt nine district figure, 17 district figure or its improved procedure, under the control strategy different situations in each district, this mode is regulated control easily back and forth at the boundary in each district, vibrates easily.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of voltage power-less automatic control system and method based on the dynamic reactive generator is provided, improved the speed of VQC the voltage power-less Comprehensive Control.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of voltage power-less automatic control system based on the dynamic reactive generator, comprise: dynamic reactive generator, voltage power-less automatic controller and fixing reactive power compensation circuit, wherein: some groups of dynamic reactive generators are connected in parallel on the system voltage bus, dynamically export continuous capacitive reactive power or perceptual idle according to control command, some groups fixedly reactive power compensation circuit be connected in parallel on the system voltage bus, according to the control command input or withdraw from, the capacitive reactive power or the perception of output fixed size are idle; The input of voltage power-less automatic controller links to each other with user CT (current transformer) with the needed voltage and current signal of acquisition controlling with user PT (voltage transformer) respectively, the output of voltage power-less automatic controller connects dynamic reactive generator and fixing reactive power compensation circuit respectively, and the output control command.
Described dynamic reactive generator comprises: control cubicle, power cabinet, startup cabinet and switch cubicle, wherein: control cubicle links to each other with power cabinet by optical fiber and exports switch motion and the voltage output of pulse with the power controlling device, control cubicle respectively with start cabinet and link to each other with switch cubicle and export and leave signal and start the closure and the disconnection of circuit breaker in the start-up mode of cabinet and the switch cubicle with control, all be connected between power cabinet and startup cabinet, startup cabinet and switch cubicle and switch cubicle and the electrical network by cable.
Described fixedly reactive power compensation circuit comprises: the inductive reactive power compensation circuit that capacitive reactive power compensating circuit that the capacitor group realizes and reactor group realize, wherein: the capacitor group comprises: capacitor, series reactor and circuit breaker, wherein, capacitor links to each other with series reactor by cable, series reactor links to each other with circuit breaker by cable, and the three constitutes the capacitive reactive power compensating circuit together; The reactor group comprises reactor, series resistance and circuit breaker, and wherein: reactor links to each other with series resistance by cable, and series resistance links to each other with circuit breaker by cable, and the three constitutes the inductive reactive power compensation circuit together.
Described voltage power-less automatic controller comprises: electric quantity acquisition and computing module, interval judgement module, idle calculating and output module, Communications Processor Module and parameter are provided with module, wherein: parameter is provided with the parameter that needs in all control procedures of block configuration, and each parameter participates in follow-up each computing and controlling unit.The voltage and current of described electric quantity acquisition and computing module acquisition controlling point, and calculate the required magnitude of voltage in each control point, idle value and power factor, each the electric weight numerical value that calculates is exported to the interval judgement module; The interval judgement module compares according to current voltage power-less value and setting thresholding, judge affiliated area, judged result is exported to idle calculating and output module, idle calculating and output module are according to the interval of current judgement, take out this interval corresponding control strategies, difference in conjunction with current system operating point and target control value, calculate the idle size of SVG output reference under each situation according to certain control method, and determine whether each capacitor, reactor drop into or withdraw from, will export the result and be converted into communications command and notify the action of each controlling object.Described Communications Processor Module is responsible for the communication data of the idle automatic controller of processes voltage and each controlling object, is responsible for issuing and uploading of parameter setting, and communicates by letter with higher level's dispatching patcher, receives the parameter setting of setting of voltage definite value and idle definite value.
VQC control method among the present invention can be coordinated the operation and the output of SVG and electric capacity/reactance, makes the adjusting congruence of each object, compares with traditional VQC control method, has improved greatly voltage and idle control response speed.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a voltage power-less automatic controller schematic diagram.
Fig. 3 is the idle output response wave shape schematic diagram that embodiment adopts SVG after the voltage power-less Comprehensive Control.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, present embodiment comprises: dynamic reactive generator, voltage power-less automatic controller and fixing reactive power compensation circuit, wherein: some groups of dynamic reactive generators are connected in parallel on the system voltage bus, dynamically export continuous capacitive reactive power or perceptual idle according to control command; Some groups fixedly reactive power compensation circuit be connected in parallel on the system voltage bus, according to the control command input or withdraw from, the capacitive reactive power or the perception of output fixed size are idle; The input of voltage power-less automatic controller links to each other with user CT with the needed voltage and current signal of acquisition controlling with user PT respectively, the output of voltage power-less automatic controller connects dynamic reactive generator and fixing reactive power compensation circuit respectively, and the output control command.
Described dynamic reactive generator comprises: control cubicle, power cabinet, startup cabinet and switch cubicle, wherein: control cubicle links to each other with power cabinet by optical fiber and exports switch motion and the voltage output of pulse with the power controlling device, control cubicle respectively with start cabinet and link to each other with switch cubicle and export and leave signal and start the closure and the disconnection of circuit breaker in the start-up mode of cabinet and the switch cubicle with control, all be connected between power cabinet and startup cabinet, startup cabinet and switch cubicle and switch cubicle and the electrical network by cable.
Described control cubicle has independently analog signal and digital signal acquiring passage, finishes signals collecting and dynamic reactive control algolithm, has the function of man-machine interface display monitoring.
Described startup cabinet by dropping into starting resistance restriction charging current, withdraws from starting resistance after finishing being incorporated into the power networks in start-up course.
Described power cabinet receives the pulse control signal of control cubicle, the needed voltage and current waveform of output reactive power compensation.
Described switch cubicle is controlled being incorporated into the power networks and withdrawing from of whole dynamic reactive device by the closed and disconnected of circuit breaker.
Described fixedly reactive power compensation circuit comprises: the inductive reactive power compensation circuit that capacitive reactive power compensating circuit that the capacitor group realizes and reactor group realize, wherein: the capacitor group comprises: capacitor, series reactor and circuit breaker, wherein, capacitor links to each other with series reactor by cable, series reactor links to each other with circuit breaker by cable, and the three constitutes the capacitive reactive power compensating circuit together; The reactor group comprises reactor, series resistance and circuit breaker, and wherein: reactor links to each other with series resistance by cable, and series resistance links to each other with circuit breaker by cable, and the three constitutes the inductive reactive power compensation circuit together.
Described capacitor provides basic capacitive reactive power electric current.
Described series reactor suppresses harmonic wave and restriction is shoved and the filtering harmonic wave.
The break-make of described circuit breaker control capacitive reactive power compensation branch road.
Described reactor provides basic perceptual reactive current.
The break-make of described circuit breaker control inductive reactive power compensation branch road.
Described voltage power-less automatic controller comprises: electric quantity acquisition and computing module, the interval judgement module, idle calculating and output module, Communications Processor Module and parameter are provided with module, wherein: electric quantity acquisition is connected with the interval judgement module with computing module and transmits current voltage power-less result of calculation information, interval judgement module and idle calculating be connected with output module and transmission range between judged result, idle calculating is connected with Communications Processor Module with output module and transmits idle reference information, Communications Processor Module is connected with each controlling object and issues idle reference information, parameter is provided with module and is connected with all modules, and transmits the parameter information of the required design of each module.
The voltage and current of described electric quantity acquisition and computing module acquisition controlling point, and calculate the required magnitude of voltage in each control point, idle value and power factor, each electric weight numerical value is exported to the interval judgement module; The interval judgement module compares according to current voltage power-less value and setting thresholding, judge affiliated area, judged result is exported to idle calculating and output module, idle calculating and output module are according to the interval of current judgement, take out this interval corresponding control strategies, difference in conjunction with current system operating point and target control value, calculate the idle size of SVG output reference under each situation according to certain control method, and determine whether each capacitor, reactor drop into or withdraw from, will export the result and be converted into communications command and notify the action of each controlling object.
Described Communications Processor Module is responsible for the communication data of the idle automatic controller of processes voltage and each controlling object, is responsible for issuing and uploading of parameter setting, and communicates by letter with higher level's dispatching patcher, receives the parameter setting of setting of voltage definite value and idle definite value.
The voltage and current signal of described electric quantity acquisition and computing module acquisition controlling point calculates information about power such as the voltage effective value, current effective value at control point, idle and power factor.
Described interval judgement module is according to the current voltage in control point and idle, make comparisons with voltage and the idle thresholding set, judge to be positioned at which following interval: voltage surpasses the upper limit, voltage surpasses lower limit, the qualified idle upper limit, the qualified idle lower limit that surpasses of voltage of surpassing of voltage.
Described idle calculating and output module calculate the idle referential data or the switching action of required compensation according to the control strategy in interval.
Described Communications Processor Module is handed down to dynamic passive compensation equipment with the idle referential data of required compensation, and the switching action command is handed down to capacitor group or reactor group.
Described parameter is provided with all modules of block configuration parameters needed in service, comprises no-load voltage ratio drift, voltage and the idle thresholding of sampling channel, control strategy, communication port and the parameter etc. that each is interval.
The control method of present embodiment may further comprise the steps:
The first step, work as U S>U H, the current voltage of expression system surpasses the qualified upper limit of setting, and adopts the method for voltage contrast value this moment, and promptly SVG increases the idle Δ Q=K that is output as U* (U S-U H), voltage deviation is big more, and it is perceptual idle big more that SVG exports, and the qualified or SVG full capacity up to system voltage, voltage are higher than qualified going up and excise all capacitors in order in limited time, or drop into all reactors in order;
Second goes on foot, works as U S<U L, the current voltage of expression system is lower than the qualified lower limit of setting, adopts the method for voltage contrast value this moment, and promptly SVG increases the idle Δ Q=K that is output as U* (U S-U L), voltage deviation is big more, and the capacitive reactive power of SVG output is big more, and the qualified or SVG full capacity up to system voltage, voltage are lower than qualified time and drop into all capacitors in limited time in order, or excise all reactors in order;
The 3rd goes on foot, works as U H>U S>U H-Δ U though the expression system voltage is qualified, is in the sensitizing range near the qualified upper limit of voltage, and this interval is made as the ring district that stagnates, and SVG no longer increases the output of capacitive reactive power, and capacitor and reactor all are failure to actuate.In like manner, if U L+ Δ U>U S>U LThough the expression system voltage is qualified, is in the sensitizing range near the qualified lower limit of voltage, this interval is made as the ring district that stagnates, SVG no longer increases the idle output of perception, and capacitor and reactor all are failure to actuate.
The 4th step: work as U H-Δ U>U S>U L+ Δ U, the expression system voltage is qualified, and control idle on the bus, and controlled target is idle qualified or power factor is qualified.For assurance had both reached idle controlled target, and voltage is still qualified in control procedure, selects two kinds of methods to carry out idle control: the idle fixed step size of pressing of (1) SVG output increases and decreases: Δ Q=constant; (2) the idle certain proportion coefficient increase and decrease of SVG output: Δ Q=(Q by idle deviation S-Q Ain) * K QWhen voltage is qualified, judge whether according to the idle situation of actual output of SVG that needs are thrown and move back one group of electric capacity or reactance, idle with the output that replaces SVG, promptly work as Q m>K C* Q CThe time, withdrawing from one group of electric capacity, single-candidate reduces the perceptual idle output of SVG simultaneously, works as Q m>-K C* Q CThe time, dropping into one group of electric capacity, single-candidate reduces the capacitive reactive power output of SVG simultaneously.Make SVG be operated in the underloading situation, so that reserve dynamic allowance for regulating rapidly next time.SVG always works in permanent idle mode, carries out idle closed loop output according to the idle reference that VQC issues.
U SBe the current system voltage value in control point, U HBe the qualified upper limit of control point voltage, U LBe the qualified lower limit of control point voltage, K UBe the idle coefficient that influences system voltage, Δ Q is the idle increment of SVG output, and Δ U is the qualified stagnant ring of voltage district, Q SBe the idle value of the current system in control point, Q AimBe the idle desired value of control point system, Q mBe the idle value of SVG output, K QBe idle bias adjustment proportionality coefficient, Q CBe the rated capacity of capacitor, K CFor capacitor is replaced the idle proportionality coefficient of SVG.
According to the wave recording of scene operation, adopt this control method after, SVG has played effect faster to systems stabilisation voltage, as shown in Figure 3.The left figure of Fig. 3 represents respectively that from top to bottom voltage is higher than preceding system's three-phase voltage, the VQC postrun system three-phase voltage of VQC operation in limited time and VQC operation back system is idle, it is 232~225kV that the qualified thresholding of voltage is set, the current voltage of system is more than the 233kV, system voltage is higher, after the VQC operation, system's three-phase voltage is reduced to about 231kV, returns acceptability limit, since the effect that VQC regulates, idle the increasing sharply of perception in the system; The right figure of Fig. 3 represents respectively that from top to bottom voltage is lower than preceding system's three-phase voltage, the VQC postrun system three-phase voltage of VQC operation in limited time down and VQC operation back system is idle, it is 232~225kV that the qualified thresholding of voltage is set, the current voltage of system is 224kV, system voltage is on the low side, and after the VQC operation, system's three-phase voltage promotes to about 227kV, return acceptability limit, because the effect that VQC regulates, capacitive reactive power increases sharply in the system, and response speed was at 1~2 second.

Claims (8)

1. voltage power-less automatic control system based on the dynamic reactive generator, it is characterized in that, comprise: dynamic reactive generator, voltage power-less automatic controller and fixing reactive power compensation circuit, wherein: some groups of dynamic reactive generators are connected in parallel on the system voltage bus, dynamically export continuous capacitive reactive power or perceptual idle according to control command; Some groups fixedly reactive power compensation circuit be connected in parallel on the system voltage bus, according to the control command input or withdraw from, the capacitive reactive power or the perception of output fixed size are idle; The input of voltage power-less automatic controller links to each other with user CT with the needed voltage and current signal of acquisition controlling with user PT respectively, the output of voltage power-less automatic controller connects dynamic reactive generator and fixing reactive power compensation circuit respectively, and the output control command;
Described dynamic reactive generator comprises: control cubicle, power cabinet, startup cabinet and switch cubicle, wherein: control cubicle links to each other with power cabinet by optical fiber and exports switch motion and the voltage output of pulse with the power controlling device, control cubicle respectively with start cabinet and link to each other with switch cubicle and export and leave signal and start the closure and the disconnection of circuit breaker in the start-up mode of cabinet and the switch cubicle with control, all be connected between power cabinet and startup cabinet, startup cabinet and switch cubicle and switch cubicle and the electrical network by cable.
2. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 1, it is characterized in that, described control cubicle has independently analog signal and digital signal acquiring passage, finishes signals collecting and dynamic reactive control algolithm, has the function of man-machine interface display monitoring; Described startup cabinet by dropping into starting resistance restriction charging current, withdraws from starting resistance after finishing being incorporated into the power networks in start-up course; Described power cabinet receives the pulse control signal of control cubicle, the needed voltage and current waveform of output reactive power compensation; Described switch cubicle is controlled being incorporated into the power networks and withdrawing from of whole dynamic reactive device by the closed and disconnected of circuit breaker.
3. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 1, it is characterized in that, described fixedly reactive power compensation circuit comprises: the inductive reactive power compensation circuit that capacitive reactive power compensating circuit that the capacitor group realizes and reactor group realize, wherein: the capacitor group comprises: capacitor, series reactor and circuit breaker, wherein, capacitor links to each other with series reactor by cable, and series reactor links to each other with circuit breaker by cable; The reactor group comprises reactor, series resistance and circuit breaker, and wherein: reactor links to each other with series resistance by cable, and series resistance links to each other with circuit breaker by cable.
4. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 1, it is characterized in that, described voltage power-less automatic controller comprises: electric quantity acquisition and computing module, the interval judgement module, idle calculating and output module, Communications Processor Module and parameter are provided with module, wherein: electric quantity acquisition is connected with the interval judgement module with computing module and transmits current voltage power-less result of calculation information, interval judgement module and idle calculating be connected with output module and transmission range between judged result, idle calculating is connected with Communications Processor Module with output module and transmits idle reference information, Communications Processor Module is connected with each controlling object and issues idle reference information, parameter is provided with module and is connected with all modules, and transmits the parameter information of the required design of each module.
5. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 4, it is characterized in that, the voltage and current of described electric quantity acquisition and computing module acquisition controlling point, and calculating the required magnitude of voltage in each control point, idle value and power factor, each electric weight numerical value is exported to the interval judgement module; The interval judgement module compares according to current voltage power-less value and setting thresholding, judge affiliated area, judged result is exported to idle calculating and output module, idle calculating and output module are according to the interval of current judgement, take out this interval corresponding control strategies, difference in conjunction with current system operating point and target control value, calculate the idle size of SVG output reference under each situation according to certain control method, and determine whether each capacitor, reactor drop into or withdraw from, will export the result and be converted into communications command and notify the action of each controlling object; Described Communications Processor Module is responsible for the communication data of the idle automatic controller of processes voltage and each controlling object, is responsible for issuing and uploading of parameter setting, and communicates by letter with higher level's dispatching patcher, receives the parameter setting of setting of voltage definite value and idle definite value; The voltage and current signal of described electric quantity acquisition and computing module acquisition controlling point calculates voltage effective value, current effective value, the idle and power factor information about power at control point; Described interval judgement module is according to the current voltage in control point and idle, make comparisons with voltage and the idle thresholding set, judge to be positioned at which following interval: voltage surpasses the upper limit, voltage surpasses lower limit, the qualified idle upper limit, the qualified idle lower limit that surpasses of voltage of surpassing of voltage; Described idle calculating and output module calculate the idle referential data or the switching action of required compensation according to the control strategy in interval; Described Communications Processor Module is handed down to dynamic passive compensation equipment with the idle referential data of required compensation, and the switching action command is handed down to capacitor group or reactor group; Described parameter is provided with all modules of block configuration parameters needed in service, comprises no-load voltage ratio drift, voltage and the idle thresholding of sampling channel, control strategy, communication port and the parameter that each is interval.
6. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 2 is characterized in that, described dynamic reactive control algolithm may further comprise the steps:
The first step, work as U S>U H, the current voltage of expression system surpasses the qualified upper limit of setting, and adopts the method for voltage contrast value this moment, and promptly SVG increases the idle Δ Q=K that is output as U* (U S-U H), voltage deviation is big more, and it is perceptual idle big more that SVG exports, and the qualified or SVG full capacity up to system voltage, voltage are higher than qualified going up and excise all capacitors in order in limited time, or drop into all reactors in order;
Second goes on foot, works as U S<U L, the current voltage of expression system is lower than the qualified lower limit of setting, adopts the method for voltage contrast value this moment, and promptly SVG increases the idle Δ Q=K that is output as U* (U S-U L), voltage deviation is big more, and the capacitive reactive power of SVG output is big more, and the qualified or SVG full capacity up to system voltage, voltage are lower than qualified time and drop into all capacitors in limited time in order, or excise all reactors in order;
The 3rd goes on foot, works as U H>U S>U H-Δ U though the expression system voltage is qualified, is in the sensitizing range near the qualified upper limit of voltage, and this interval is made as the ring district that stagnates, and SVG no longer increases the output of capacitive reactive power, and capacitor and reactor all are failure to actuate; Work as U L+ Δ U>U S>U LThough the expression system voltage is qualified, is in the sensitizing range near the qualified lower limit of voltage, this interval is made as the ring district that stagnates, SVG no longer increases the idle output of perception, and capacitor and reactor all are failure to actuate;
The 4th step: work as U H-Δ U>U S>U L+ Δ U, the expression system voltage is qualified, and control idle on the bus, and controlled target is idle qualified or power factor is qualified, when voltage is qualified, when the idle value of SVG output is replaced the rated capacity of the idle proportionality coefficient * capacitor of SVG greater than capacitor, i.e. Q m>K C* Q C, withdrawing from one group of electric capacity, single-candidate reduces the perceptual idle output of SVG simultaneously;
Work as Q m>-K C* Q CThe time, drop into one group of electric capacity, simultaneously single-candidate reduces the capacitive reactive power output of SVG, finally makes SVG be operated in the underloading situation and always works in permanent idle mode, carries out idle closed loop output according to the idle reference that VQC issues;
Described U SBe the current system voltage value in control point, U HBe the qualified upper limit of control point voltage, U LBe the qualified lower limit of control point voltage, K UBe the idle coefficient that influences system voltage, Δ Q is the idle increment of SVG output, and Δ U is the qualified stagnant ring of voltage district, Q SBe the idle value of the current system in control point, Q AimBe the idle desired value of control point system, Q mBe the idle value of SVG output, K QBe idle bias adjustment proportionality coefficient, Q CBe the rated capacity of capacitor, K CFor capacitor is replaced the idle proportionality coefficient of SVG.
7. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 6 is characterized in that, the idle increment Delta Q of described SVG output is a natural constant.
8. the voltage power-less automatic control system based on the dynamic reactive generator according to claim 6 is characterized in that, the idle increment Delta Q=(Q of described SVG output S-Q Aim) * K Q
CN 201110176574 2011-06-28 2011-06-28 Voltage quality control (VQC) system based on static var generator(SVG) and method thereof Expired - Fee Related CN102231525B (en)

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CN103166226A (en) * 2013-03-29 2013-06-19 华北电力大学(保定) Network voltage reactive-power compound coordination control system and method for new energy power generation
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