CN103280811B - A kind of quality of power supply control system and control method thereof that possesses failure current limit function - Google Patents
A kind of quality of power supply control system and control method thereof that possesses failure current limit function Download PDFInfo
- Publication number
- CN103280811B CN103280811B CN201310234552.4A CN201310234552A CN103280811B CN 103280811 B CN103280811 B CN 103280811B CN 201310234552 A CN201310234552 A CN 201310234552A CN 103280811 B CN103280811 B CN 103280811B
- Authority
- CN
- China
- Prior art keywords
- phase
- control
- voltage
- arm
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- Y—GENERAL 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Landscapes
- Rectifiers (AREA)
Abstract
The invention discloses a kind of quality of power supply control system and control method thereof that possesses failure current limit function, comprised three-phase H bridge PWM rectifier, three-phase four-arm series converter, thyristor control short circuit branch, thyristor control bypass reactance arm and corresponding control method thereof. PWM rectifier and three-phase four-arm series converter common DC side realize the two-way exchange of energy; the quality of voltage problem of the falling of series converter compensation network voltage, lifting, three-phase imbalance and harmonic voltage; simultaneously in the time there is dissimilar short trouble in electrical network; system is carried out current limliting by control series converter, thyristor control short circuit branch, thyristor control bypass reactance arm; realize steady load supply voltage, improve under power supply quality, short trouble and protect electrical network and load equipment, improve the object of power system safety and stability.
Description
Technical field
The invention belongs to power technology field, relate to a kind of quality of power supply control system that possesses failure current limit function andControl method.
Background technology
The basic demand of Operation of Electric Systems be safe and reliable, the quality of power supply is high, good economy performance, affects power system safety and stabilityThe factor of operation is mainly various forms of short troubles and various power quality problem. When short trouble occurs, system power is prominentSo increase, lower voltage, not only make electrical equipment cisco unity malfunction, causes power outage, and destroy electric insulation, burnsRuin electrical equipment, initiation fire, even causes system sectionalizing, destroys the safe and stable operation of system. On the other hand, in recent years,Various non-linear, impacts and unbalanced load constantly access electrical network, cause that power network current, voltage waveform distort, and causeLine voltage such as falls at the power quality problem, and these power quality problems increase line losses, make energy loss serious, draw thusElectricity power security of system accident is frequently existing. Therefore, the power quality problem such as short circuit malfunction and voltage pulsation, Voltage unbalanceAll the safety and stability to power system and user are had a negative impact. The current limiting technique scheme of existing comparative maturity be mainlyCurrent-limiting reactor on bus.
The main feature of existing current limiting technique:
1, bus series reactance only can be realized the function of failure current limit, can not solve the shadow of power quality problem to electrical network and userRing.
2, bus series reactance can expend a large amount of meritorious, quadergies.
3, bus series reactance utilization rate is low, only in the time of fault, works.
4, owing to being serially connected in for a long time in electrical network, series reactance can not be too large, makes current limitation effect good not.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of quality of power supply control system that possesses failure current limit functionSystem and control method thereof, can realize short circuit malfunction current limliting and voltage pulsation compensation, imbalance compensation, harmonic voltageMulti-functional topological structure, control method and the logic control mode for dissimilar short trouble of compensation.
Its technical scheme is as follows:
Possesses a quality of power supply control system for failure current limit function, mainly by three-phase H bridge PWM rectifier, three-phase four-armSeries converter, thyristor control short circuit branch, thyristor control bypass reactance arm composition, wherein three-phase H bridge PWM rectificationDevice is connected to the grid by shunt transformer T4, and three-phase four-arm series converter and PWM rectifier are realized by common DC sideEnergy two-way exchange, series converter output adopts LC wave filter, and A, B, C three-phase brachium pontis output point are short by thyristor controlRoad branch road is connected to series transformer secondary side neutral point, series transformer primary side parallel thyristors control bypass reactance arm,The described quality of power supply control system that possesses failure current limit function seals between electrical network and load.
Further preferably, described series transformer secondary side adopts star connection, and series transformer secondary side neutral point is drawn and receivedThe 4th brachium pontis output point o of three-phase four-arm series converter.
A kind of its control method of quality of power supply control system that possesses failure current limit function comprises: to three-phase H bridge PWM rectifierControl, the control of three-phase four-arm series converter, Current limited Control, its concrete control procedure is as follows:
(1) three-phase H bridge PWM rectifier is adopted to the control of engineering dead beat, it is as follows that it specifically controls step:
1, the magnitude of voltage that DC side need to be stabilized toWith the actual DC voltage value U detectingdcAfter doing difference, carry out PI tuneJoint;
2, the amount after PI adjusting is multiplied by and the same sinusoidal quantity sin of homophase frequently of shunt transformer secondary side three-phase voltage, as requiredThe command value of three-phase electric current of voltage regulation()；
3, the command value of three-phase electric current of voltage regulation and the actual electric current of voltage regulation i detectingw(a,b,c)(be iwa，iwb，iwc) do poor,To difference be multiplied byWherein LzFor the value of PWM rectifier outputting inductance, the cycle that dt is discrete lower controlled frequency;
4, add by the data that obtain in 3 each phase voltage U that shunt transformer secondary side detectsw(a,b,c)(be Uwa，Uwb，Uwc), then be multiplied byJust obtain the dutycycle d of ABC three-phaseon(a,b,c)(be dona，donb，donc), three-phase dutycycle letterAfter number modulation, control three-phase H bridge PWM rectifier through driving.
(2) voltage compensation of three-phase four-arm series converter adopts Cycle Control, and the feedback of the 4th brachium pontis adopts current closed-loopPI controls, and it is as follows that it specifically controls step:
Due to A, B, the control procedure of C three-phase brachium pontis is identical, describes as an example of A phase brachium pontis control procedure example.
1, testing circuit detects supply voltage usaExtract fundamental voltage whereinMeanwhile, generate with supply voltage same frequency,Same-phase is wanted the standard sine voltage u being stabilized torefa, utilize instantaneous power ipiq algorithm to detect load voltage ULIn humorous wavelength-divisionAmount ULh。
2、With standard sine signal urefaSubtract each other the difference obtaining and add the harmonic component U in load voltageLhBe multiplied by afterwards(no-load voltage ratio of series transformer is K to 1/K: 1), the constant two-way control as one-cycle controller in-1, one road is multiplied by this signal one roadReference signal processed.
3, sampling DC capacitor voltage udc, by resetting integrator, DC voltage is carried out to integration.
4, the 2 control reference signals that are multiplied by after-1 that obtain are sent into voltage comparator A1, another road reference signal is sent into voltageComparator A2, the integrated signal obtaining in 3 is sent into A1, another input of A2, the output signal of A1 is sent into R-S trigger Aa1R end, the output signal of A2 is sent into the R end of R-S trigger Aa2, two trigger S ends share clock sources. When oneWhen individual clock pulses arrives, the S of R-S trigger triggers, by Q end output high level signal, simultaneouslyEnd is output as low level,Integrator starts capacitance voltage to carry out integration. Along with the continuous rising of integrated value, when integrated value rises to 2 controls that obtainWhen reference signal value, comparator Output rusults changes, and trigger R end enables, and Q holds output low level, simultaneouslySection outputHigh level, reset integrator, makes integrator zero clearing, until the arrival of next clock pulses, then start the new cycle, again long-pendingPoint.
5, by usaSignal and 0 relatively, work as usaBe greater than at 0 o'clock and export high level, be less than 0 o'clock output low level, in step 4, triggerDevice Aa1, selector switch is sent in two Q outputs of Aa2, works as usaThe output signal of selecting Aa2 while being greater than 0 high level formation is littleIn the time that forming, the low level of zero output selects the output signal of Aa1.
6, the pwm control signal obtaining in step 5 is controlled after overdriving to switching tube conducting and the shutoff of A phase brachium pontis.
Its control procedure of the 4th brachium pontis adopts current closed-loop PI to control. Detailed process is as follows:
1, detection series transformer is coupled to the current i of secondary sideca、icb、icc, calculate ica、icb、iccAnd, after it is multiplied by-1Obtain irefoAs the instruction references signal of the 4th brachium pontis.
2, detect the output current i of the 4th brachium pontisco，irefoWith icoAfter doing difference, carry out pi regulator, PI output is carried out after amplitude limitTriangular modulation, the pwm control signal obtaining is controlled the switching tube of the 4th brachium pontis after overdriving.
(3) that Current limited Control step after dissimilar short trouble occurs is as follows for electrical network:
1, in the time that single-phase shorted to earth occurs the electrical network of 10kV isolated neutral system, short circuit current is very little, and electrical network can be with oneIndividual earth point continues operation, and this control system is failure to actuate;
2, in the time there is phase fault, alternate shorted to earth fault, fault phase current surge, this control system detects faultAfter, first block the fault phase work brachium pontis of series converter, after time delay delay1, open fault phase thyristor control short circuit branch,The outputting inductance of thyristor control short circuit branch control series converter is shorted to Circuit Fault on Secondary Transformer and carries out current limliting, from short troubleAfter occurring, control this phase brake tube control bypass reactance arm after time delay delay2 and open and drop into bypass reactance and carry out current limliting, end formBecome series converter output reactance and bypass reactance arm to combine the effect that drops into current limliting, simultaneously healthy phases and the associating of the 4th brachium pontisOperation is still operated in quality of power supply compensating coefficient;
3,, in the time there is three-phase shortcircuit, three relative ground circuits, ABC three-phase fault phase brachium pontis blocks series converter after blocking againThe 4th brachium pontis, three-phase thyristor control short circuit branch conducting after time delay delay1 after short trouble detected, the change of connectingThe outputting inductance of stream device is shorted to series transformer secondary side and carries out current limliting, three-phase thyristor after the time delay delay2 time after faultThe conducting of control bypass reactance arm, finally forms series converter output reactance and bypass reactance arm is combined the effect that drops into current limlitingReally.
Compared with prior art, beneficial effect of the present invention: the quality of power supply control system that possesses failure current limit provided by the inventionAnd control method, can bucking voltage lifting, fall, imbalance of three-phase voltage, voltage-type harmonic wave, improves power system power supplyReliability, stability, the power supply quality of power supply of raising user side; Limiting short-circuit current, raising power system and power supply unitSecurity, the safety of protection subscriber equipment, shortens short trouble and occurs to electrical network between relay protection action and bear short circuit currentTime, improve electric network security; Three-phase four-arm outputting inductance is combined current limliting with thyristor control bypass reactance arm and can be playedReduce the object of series transformer and outputting inductance design capacity, and can require to arrange flexibly by thyristor control according to power systemRoad reactance size realizes the current limitation of different brackets, has improved application scenario; First carrying out series converter outputting inductance is shorted toSeries transformer secondary side carries out current limliting, then drops into thyristor control bypass reactance current limliting, because outputting inductance is connected with and one alwaysInferior side becomes K (K is series transformer no-load voltage ratio) electric current doubly, and its short circuit operation can not produce overvoltage, has avoided systemImpact.
Brief description of the drawings
Fig. 1 is the quality of power supply control system topological structure that possesses failure current limit function;
Fig. 2 is three-phase H bridge PWM rectifier control procedure;
Fig. 3 is three-phase four-arm series converter control procedure;
Fig. 4 is the control mode of the 4th brachium pontis;
Fig. 5 is the manner of execution of control system under different faults type;
Fig. 6 is the signal processing of control system.
Detailed description of the invention
Further illustrate technical scheme of the present invention below in conjunction with drawings and Examples.
Fig. 1 is the quality of power supply control system topological structure that possesses failure current limit function that the present invention proposes. Mainly by three-phase H bridgeThe groups such as PWM rectifier, three-phase four-arm series converter, thyristor control short circuit branch, thyristor control bypass reactance armBecome, wherein three-phase H bridge PWM rectifier is connected to the grid by shunt transformer T4, three-phase four-arm series converter and PWMRectifier is realized bidirectional energy exchange, the series transformer secondary side of three-phase four-arm series converter by common DC lateral capacitanceBe connected into star connection, neutral point is drawn and is received the 4th brachium pontis output point o, A, and B, C three-phase brachium pontis output point passes through thyristor controlShort circuit branch is connected to series transformer secondary side neutral point, for filtering by IGBT open with turn off process in the switch that producesHarmonic wave, series converter adopts LC output filter, series transformer primary side parallel thyristors control bypass reactance arm.The whole quality of power supply control system series connection that possesses failure current limit function is linked between electrical network and load.
Three-phase H bridge PWM rectifier and three-phase four-arm series converter common DC side realize the two-way flow of energy, work as electrical networkWhen voltage lifting, energy flows to PWM rectifier from series converter, and in the time that line voltage falls, energy flows from PWM rectifierTo series converter.
Three-phase four-arm series converter by detect three-phase phase voltage lifting, fall, three-phase imbalance and harmonic voltage feelingsCondition, control each phase brachium pontis to voltage lifting, fall, imbalance and harmonic voltage compensate, in the time of three-phase imbalance, noBalanced balanced current flows back to DC side by the control of the 4th brachium pontis.
Thyristor control short circuit branch is arranged on the side of three-phase four-arm series converter output LC wave filter near switching tube,When short circuit current rises to limit value after short trouble occurs, open signal to IGCT, output reactance is shorted to series connection transformationDevice secondary side, the equiva lent impedance of inductance is carried out current limliting after converting primary side.
Thyristor control bypass reactance arm is parallel to the series transformer primary side of three-phase four-arm series converter, line when short circuitRoad electric current, up to tens kilo-amperes, makes the design of outputting inductance and series transformer comparatively difficult. After short circuit, first carry out IGCTControl short circuit branch and move, outputting inductance is shorted to series transformer secondary side and carries out current limliting, make afterwards thyristor controlBypass branch action conducting, by-pass inductor drops into and carries out current limliting, finally forms outputting inductance is combined current limliting effect with by-pass inductor,Reach the object that reduces outputting inductance and series transformer design capacity.
The connected mode of PWM current transformer: inductance is connected to the interchange end of IGBT, and DC bus capacitor is connected to the DC terminal of IGBT.
The DC terminal of the connected mode of three-phase four-arm series converter: IGBT is connected to the direct current of three-phase H bridge PWM rectifierLateral capacitance two ends, the interchange end of IGBT connects LC output filter, and LC output filter connects series transformer, series connection transformationDevice is concatenated between power supply and load.
Fig. 2 is the control procedure of PWM rectifier. The control of PWM rectifier adopts the control of engineering dead beat, and setting DC side needsThe magnitude of voltage being stabilized to isThe actual DC voltage value detecting is Udc, both carry out PI adjusting after doing difference,To DC quantity be multiplied by and shunt transformer secondary side three-phase voltage with the sinusoidal quantity sin of homophase frequently, as required three-phase voltage stabilizing electricityThe command value of stream(), the command value of three-phase electric current of voltage regulation and the actual electric current of voltage regulation i detectingw(a,b,c)(be iwa，iwb，iwc) do poorly, be multiplied byWherein LzFor the value of PWM rectifier outputting inductance, dt is discrete lower controlIn the cycle of frequency, add afterwards each phase voltage U that shunt transformer secondary side detectsw(a,b,c)(be Uwa，Uwb，Uwc)，Be multiplied by againJust obtain the dutycycle d of ABC three-phaseon(a,b,c)(be dona，donb，donc), the modulation of three-phase duty cycle signalsRear drive control PWM rectifier.
Fig. 3 is three-phase four-arm series converter ABC three-phase brachium pontis control procedure.
Because the voltage compensation of Cycle Control can be introduced the fluctuation of DC voltage, it has fast response time simultaneously, and error is notCan be accumulated to next cycle, the advantage that control accuracy is high, so adopt single at the voltage compensation of three-phase four-arm series converterWeek is controlled, and the feedback of the 4th brachium pontis adopts current closed-loop PI to control. Concrete control procedure is:
Due to A, B, the control of C three-phase brachium pontis is identical, taking the control of A phase brachium pontis as example explanation.
1, testing circuit detects supply voltage usaExtract fundamental voltage whereinMeanwhile, generate with supply voltage same frequency,Same-phase is wanted the standard sine voltage u being stabilized torefa, utilize instantaneous power ipiq algorithm to detect load voltage ULIn humorous wavelength-divisionAmount ULh。
2、With standard sine signal urefaSubtract each other the difference obtaining and add the harmonic component U in load voltageLhBe multiplied by afterwards(no-load voltage ratio of series transformer is K to 1/K: 1), the constant two-way control as one-cycle controller in-1, one road is multiplied by this signal one roadReference signal processed.
3, sampling DC capacitor voltage udc, by resetting integrator, DC voltage is carried out to integration.
4, the 2 control reference signals that are multiplied by after-1 that obtain are sent into voltage comparator A1, another road reference signal is sent into voltageComparator A2,3 integrated signals that obtain are sent into A1, another input of A2, the output signal of A1 is sent into the R of R-S trigger Aa1End, the output signal of A2 is sent into the R end of R-S trigger Aa2, and two trigger S ends share a clock source. In the time of oneWhen clock arrives, the S of R-S trigger triggers, by Q end output high level signal, simultaneouslyEnd is output as low level, integrationDevice starts capacitance voltage to carry out integration. Along with the continuous rising of integrated value, when integrated value rises to the 2 control references that obtainWhen signal value, comparator Output rusults changes, and trigger R end enables, and Q holds output low level, simultaneouslyThe high electricity of section outputFlat, reset integrator, makes integrator zero clearing, until the arrival of next clock pulses, then start new cycle, again integration.
5, by usaSignal and 0 relatively, work as usaBe greater than at 0 o'clock and export high level, be less than 0 o'clock output low level, in step 4, triggerDevice Aa1, selector switch is sent in two Q outputs of Aa2, works as usaThe output signal of selecting Aa2 while being greater than 0 high level formation is littleIn the time that forming, the low level of zero output selects the output signal of Aa1.
6, the pwm control signal obtaining in step 5 is controlled after overdriving to switching tube conducting and the shutoff of A phase brachium pontis.
The control procedure of the 4th brachium pontis when Fig. 4 is voltage compensation process and healthy phases continuous service.
The effect of the 4th brachium pontis is mainly that the out-of-balance current of ABC three-phase is fed back to electric capacity, makes imbalance compensation and healthy phasesWhen operation, its control procedure adopts current closed-loop PI to control. Detailed process is as follows:
1, detection series transformer is coupled to the current i of secondary sideca、icb、icc, calculate ica、icb、iccAnd, after it is multiplied by-1Obtain irefoAs the instruction references signal of the 4th brachium pontis.
2, detect the output current i of the 4th brachium pontisco，irefoWith icoAfter doing difference, carry out pi regulator, PI output is carried out after amplitude limitTriangular modulation, the pwm control signal obtaining is controlled the switching tube of the 4th brachium pontis after overdriving.
Fig. 5 is the quality of power supply control system manner of execution that possesses failure current limit function under different faults type. When neutral point does not connectWhen single-phase shorted to earth fault occurs ground network system, control system is failure to actuate; In the time there is phase fault, alternate shorted to earth,Control system is blocked fault phase brachium pontis, thyristor control short circuit branch conducting after the time delay delay1 time after fault, fault phase stringThe secondary side that connection current transformer outputting inductance is shorted to series transformer carries out current limliting, after fault after delay2 time delay brilliant lockManagement and control bypass reactance processed drops into carries out current limliting, forms outputting inductance combine current limliting effect with bypass reactance, while healthy phases andThe 4th brachium pontis cooperation carries out the quality of power supply compensation of healthy phases and controls. When electrical network generation three-phase shortcircuit or three relative ground circuitsTime, block three-phase brachium pontis and the 4th brachium pontis, after fault, after time delay delay1, control the conducting of three-phase thyristor short circuit branch, series connectionCurrent transformer outputting inductance seals in circuit current limliting, after fault after the time delay delay2 time three-phase thyristor control bypass reactance drop into intoRow associating current limliting, to reach the design capacity object that reduces series converter outputting inductance and series transformer, also can be flexibly moreChange bypass reactance and realize the object that reaches different current limitation effects, avoided superpotential problem simultaneously.
Fig. 6 is the signal processing of control system. PWMa, PWMb, PWMc represents respectively series converter ABC three-phaseThe control signal of the upper and lower two pipe IGBT of brachium pontis, Faulta, Faultb, Faultc represents the short-circuit state of ABC three-phase line, high electricityFlat this phase circuit fault (existing a lot of detection methods, the present invention no longer narrates) that is short-circuited that represents. When a certain phase or severally send out mutuallyWhen raw short trouble, this phase fault signal Faultx is high level, after low transition, believes with the PWM of this phase brachium pontis controlNumber multiplying each other obtains low level, and upper and lower two pipe IGBT are blocked; This phase fault signal Faultx signal is through delay1 simultaneouslySignal after time delay is controlled series converter outputting inductance and is shorted to series transformer secondary and carries out current limliting. And this phase fault signalFaultx makes the conducting of thyristor control bypass reactance arm carry out bypass current limliting after the time delay of delay2 time through overdriving,The final outputting inductance that forms is combined current limitation effect with bypass reactance. If all there is short trouble in three-phase, except blocking three-phase eventOutside barrier brachium pontis, three-phase fault signal Faulta, Faultab, Faultc through with after the high level that obtains after oppositely andThe control signal PWM4 of the 4th brachium pontis multiplies each other, and the control signal of the 4th brachium pontis is blocked, and the upper and lower IGBT of this brachium pontis blocks, itRear time delay delay1 carries out the action of three-phase thyristor short circuit branch, and time delay delay2 carries out bypass reactance action, finally forms defeatedGo out inductance and combine current limliting with bypass reactance.
The above, be only best mode for carrying out the invention, any be familiar with those skilled in the art the present invention discloseIn technical scope, the simple change of the technical scheme that can obtain apparently or equivalence are replaced and are all fallen into protection scope of the present inventionIn.
Claims (3)
1. a quality of power supply control system that possesses failure current limit function, is characterized in that, mainly by three-phase H bridge PWMRectifier, three-phase four-arm series converter, thyristor control short circuit branch, thyristor control bypass reactance arm composition,Wherein three-phase H bridge PWM rectifier is connected to the grid by shunt transformer T4, three-phase four-arm series converter and three-phaseH bridge PWM rectifier is realized energy two-way exchange by common DC side, and the output of three-phase four-arm series converter adoptsLC wave filter, A, B, C three-phase brachium pontis output point are connected to series transformer secondary by thyristor control short circuit branchSide neutral point, series transformer primary side parallel thyristors control bypass reactance arm, described in possess failure current limit functionQuality of power supply control system seals between electrical network and load;
In the time of line voltage lifting, energy flows to three-phase H bridge PWM rectifier from three-phase four-arm series converter, whenWhen line voltage falls, energy flows to three-phase four-arm series converter from three-phase H bridge PWM rectifier;
Three-phase four-arm series converter by detect three-phase phase voltage lifting, fall, three-phase imbalance and harmonic wave electricityPressure situation, control each phase brachium pontis to voltage lifting, fall, imbalance and harmonic voltage compensate, when three-phase injusticeWhen weighing apparatus, out-of-balance current flows back to DC side by the control of the 4th brachium pontis;
Thyristor control short circuit branch is arranged on three-phase four-arm series converter output LC wave filter near one of switching tubeSide, when short circuit current rises to limit value after short trouble occurs, opens signal to IGCT, and output reactance is shorted toSeries transformer secondary side, the equiva lent impedance of inductance is carried out current limliting after converting primary side;
Thyristor control bypass reactance arm is parallel to the series transformer primary side of three-phase four-arm series converter, shortLu Hou, first carries out thyristor control short circuit branch and moves, and outputting inductance is shorted to series transformer secondary side and carries outCurrent limliting, makes thyristor control bypass reactance arm action conducting afterwards, and by-pass inductor drops into and carries out current limliting, finally forms defeatedGo out inductance and combine the effect of current limliting with by-pass inductor, reach the object that reduces outputting inductance and series transformer design capacity;
The connected mode of PWM current transformer: inductance is connected to the interchange end of IGBT, and DC bus capacitor is connected to IGBT'sDC terminal; The DC terminal of the connected mode of three-phase four-arm series converter: IGBT is connected to three-phase H bridge PWM rectificationThe DC bus capacitor two ends of device, the interchange end of IGBT connects output LC wave filter, and output LC wave filter connects series connection and becomesDepressor, series transformer is concatenated between power supply and load.
2. the quality of power supply control system that possesses failure current limit function according to claim 1, is characterized in that instituteState series transformer secondary side and adopt star connection, series transformer secondary side neutral point is drawn and is received three-phase four-arm series connectionThe 4th brachium pontis output point o of current transformer.
3. a control method that possesses the quality of power supply control system of failure current limit function, is characterized in that, comprises threeThe control of phase H bridge PWM rectifier, the control of three-phase four-arm series converter, Current limited Control, its concrete control procedureAs follows:
(1) three-phase H bridge PWM rectifier is adopted to the control of engineering dead beat, it is as follows that it specifically controls step:
1.1) the magnitude of voltage U that DC side need to be stabilized to* dcWith the actual DC voltage value U detectingdcAfter doing difference, carry out PIRegulate;
1.2) amount after PI adjusting is multiplied by and the same sinusoidal quantity sin of homophase frequently of shunt transformer secondary side three-phase voltage, as instituteNeed the command value i of three-phase electric current of voltage regulation* w(a,b,c)(be i* wa，i* wb，i* wc)；
1.3) command value of three-phase electric current of voltage regulation and the actual electric current of voltage regulation i detectingw(a，b，c)(be iwa，iwb，iwc) do poor,The difference obtaining is multiplied byWherein LzFor the value of three-phase H bridge PWM rectifier outputting inductance, dt is discrete lower control frequencyThe cycle of rate;
1.4) by 1.3) in the data that obtain add each phase voltage U that shunt transformer secondary side detectsw(a，b，c)(be Uwa，Uwb，Uwc), then be multiplied byJust obtain the dutycycle d of ABC three-phaseon(a，b，c)(be dona，donb，donc), three-phase accounts forEmpty than controlling three-phase H bridge PWM rectifier through driving after signal modulation;
(2) voltage compensation of three-phase four-arm series converter adopts Cycle Control, and the feedback of the 4th brachium pontis adopts current closed-loopPI controls, and it is as follows that it specifically controls step:
A phase brachium pontis control procedure is:
2.1), testing circuit detects supply voltage usaExtract fundamental voltage u wherein* sa, meanwhile, generate with supply voltage sameFrequency, same-phase are wanted the standard sine voltage u being stabilized torefa, utilize instantaneous power ipiq algorithm to detect load voltage ULIn harmonic component ULh；
2.2)、u* saWith standard sine voltage urefaSubtract each other the difference obtaining and add the harmonic component U in load voltageLhItAfter be multiplied by 1/K, the no-load voltage ratio of series transformer is K: 1, it is constant as one-cycle controller that-1, one road is multiplied by this signal one roadTwo-way control reference signal;
2.3), sampling DC capacitor voltage udc, by resetting integrator, DC voltage is carried out to integration;
2.4), by 2.2) the control reference signal being multiplied by after-1 that obtains sends into voltage comparator A1, another road is with reference to letterNumber send into voltage comparator A2,2.3) in the integrated signal that obtains send into A1, another input of A2, the output letter of A1Number send into the R end of R-S trigger Aa1, the output signal of A2 is sent into the R end of R-S trigger Aa2, two triggeringsDevice S end shares a clock source, and in the time that a clock pulses arrives, the S of R-S trigger triggers, defeated by Q endGo out high level signal, simultaneouslyEnd is output as low level, and integrator starts capacitance voltage to carry out integration, along with integrated valueContinuous rising, when integrated value rises to 2.2) when the control reference signal value that obtains, comparator Output rusults becomesChange, trigger R end enables, and Q holds output low level, simultaneouslySection output high level, reset integrator, makes integratorZero clearing, until the arrival of next clock pulses, then start new cycle, again integration:
2.5), by usaSignal and 0 relatively, work as usaBe greater than at 0 o'clock and export high level, be less than 0 o'clock output low level, stepRapid 2.4) trigger Aa1 in, selector switch is sent in two Q outputs of Aa2, works as usaChoosing while being greater than 0 high level formationSelect the output signal of Aa2, when minus low level forms, select the output signal of Aa1;
2.6), by step 2.5) in the switching tube conducting of controlling A phase brachium pontis after overdriving of the pwm control signal that obtains withTurn-off, B, the control procedure of C two-phase brachium pontis is identical with A phase brachium pontis control procedure;
Its control procedure of the 4th brachium pontis adopts current closed-loop PI to control, and detailed process is as follows:
2.7), detection series transformer is coupled to the current i of secondary sideca、icb、icc, calculate ica、icb、iccAnd, it is taken advantage ofAfter-1, obtain irefoAs the instruction references signal of the 4th brachium pontis,
2.8), detect the output current i of the 4th brachium pontisco，irefoWith icoAfter doing difference, carry out pi regulator, PI exports through amplitude limitAfter carry out triangular modulation, the pwm control signal obtaining is controlled the switching tube of the 4th brachium pontis after overdriving;
(3) that Current limited Control step after dissimilar short trouble occurs is as follows for electrical network:
3.1), in the time that single-phase shorted to earth occurs the electrical network of 10kV isolated neutral system, short circuit current is very little, electrical network energyEnough be with an earth point to continue operation, this control system is failure to actuate;
3.2), in the time there is phase fault, alternate shorted to earth fault, fault phase current surge, this control system detectsAfter fault, first block the fault phase work brachium pontis of three-phase four-arm series converter, after time delay delay1, open fault phase crystalline substanceBrake tube control short circuit branch, the outputting inductance of thyristor control short circuit branch control three-phase four-arm series converter is shorted toSeries transformer secondary side carries out current limliting, after short trouble occurs, after time delay delay2, controls this phase thyristor control bypassReactance arm is opened input bypass reactance and is carried out current limliting, finally forms the output reactance of three-phase four-arm series converter and bypassReactance arm is combined the effect that drops into current limliting, and healthy phases and the 4th brachium pontis cooperation are still operated in quality of power supply benefit simultaneouslyRepay state;
3.3), in the time there is three-phase shortcircuit, three relative ground circuits, ABC three-phase fault phase brachium pontis blocks three-phase after blocking againThe 4th brachium pontis of four brachium pontis series converters, detects three-phase thyristor control short circuit after time delay delay1 after short troubleBranch road conducting, is shorted to series transformer secondary side by the outputting inductance of three-phase four-arm series converter and carries out current limliting, thereforeThree-phase thyristor control bypass reactance arm conducting after the time delay delay2 time after barrier, finally forms three-phase four-arm series connection and becomesStream device output reactance and bypass reactance arm are combined the effect that drops into current limliting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310234552.4A CN103280811B (en) | 2013-06-14 | 2013-06-14 | A kind of quality of power supply control system and control method thereof that possesses failure current limit function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310234552.4A CN103280811B (en) | 2013-06-14 | 2013-06-14 | A kind of quality of power supply control system and control method thereof that possesses failure current limit function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103280811A CN103280811A (en) | 2013-09-04 |
| CN103280811B true CN103280811B (en) | 2016-05-11 |
Family
ID=49063287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310234552.4A Expired - Fee Related CN103280811B (en) | 2013-06-14 | 2013-06-14 | A kind of quality of power supply control system and control method thereof that possesses failure current limit function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103280811B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715693B (en) * | 2013-11-11 | 2016-08-31 | 国家电网公司 | A kind of voltage compensation and failure current limit hybrid system and control method thereof |
| CN104701838A (en) * | 2013-12-06 | 2015-06-10 | 广西大学 | Unified power quality adjusting device based on battery energy storage |
| CN104617580B (en) * | 2015-01-28 | 2017-05-31 | 湖南大学 | Resonant mode current limiting system and control method |
| CN106786470B (en) * | 2015-11-19 | 2021-03-02 | 中国石油化工股份有限公司 | Flexible grounding system for neutral point of power grid |
| CN106786471A (en) * | 2015-11-20 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of unidirectional active power compensator of power network neutral point isolated neutral system |
| CN106099990A (en) * | 2016-05-30 | 2016-11-09 | 国家电网公司 | High permeability distributed photovoltaic quality of voltage improves device and control system thereof |
| CN106452148B (en) * | 2016-12-05 | 2018-12-28 | 阳光电源股份有限公司 | Three-level three-phase four-bridge arm inversion system and its control method and controller |
| CN106786643B (en) * | 2016-12-16 | 2019-03-26 | 湖南大学 | Fault current active control type current limiting system and its control method |
| CN106684826B (en) * | 2017-03-13 | 2019-01-08 | 湖南利能科技股份有限公司 | A kind of Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM |
| CN107248730B (en) * | 2017-08-14 | 2020-04-03 | 广东电网有限责任公司电力科学研究院 | Short-circuit protection circuit of flexible direct current transmission system |
| CN109188259A (en) * | 2018-07-27 | 2019-01-11 | 中国科学院合肥物质科学研究院 | A kind of the test circuit and test method of the test of semiconductor switch trigger protection |
| CN110011305A (en) * | 2019-04-23 | 2019-07-12 | 安徽大学 | A kind of controlling device that rail traffic low-voltage system voltage temporarily drops |
| CN110208634B (en) * | 2019-05-08 | 2021-05-04 | 上海电力学院 | Method for acquiring asymmetric short-circuit current direct-current component of complex power system |
| CN111313424A (en) * | 2020-03-27 | 2020-06-19 | 西安交通大学 | Three-phase four-wire system universal power quality controller and control method thereof |
| CN111668840A (en) * | 2020-06-08 | 2020-09-15 | 深圳供电局有限公司 | Active power filter based on digital resettable integral control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1191661A2 (en) * | 2000-09-22 | 2002-03-27 | Sanyo Denki Co., Ltd. | Uninterruptible power system |
| CN2657256Y (en) * | 2003-10-17 | 2004-11-17 | 新疆特变电工股份有限公司 | Short-circuit fault current limiter |
| CN203312813U (en) * | 2013-06-14 | 2013-11-27 | 湖南大学 | Novel power quality control system with fault current limiting function |
-
2013
- 2013-06-14 CN CN201310234552.4A patent/CN103280811B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1191661A2 (en) * | 2000-09-22 | 2002-03-27 | Sanyo Denki Co., Ltd. | Uninterruptible power system |
| CN2657256Y (en) * | 2003-10-17 | 2004-11-17 | 新疆特变电工股份有限公司 | Short-circuit fault current limiter |
| CN203312813U (en) * | 2013-06-14 | 2013-11-27 | 湖南大学 | Novel power quality control system with fault current limiting function |
Non-Patent Citations (2)
| Title |
|---|
| 固态限流器的研制;蔡永华;《中国优秀硕士学位论文全文数据库工程科技II辑》;20040915;4-61 * |
| 基于VSC的多目标控制短路电流限制器研究;张智;《中国优秀硕士学位论文全文数据库工程科技II辑》;20091015;5-19 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103280811A (en) | 2013-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103280811B (en) | A kind of quality of power supply control system and control method thereof that possesses failure current limit function | |
| CN105162155B (en) | A kind of series hybrid bipolar direct current transmission system with DC Line Fault ride-through capability | |
| CN201274399Y (en) | DC great current deicing apparatus with static state reactive compensation function | |
| CN103986136B (en) | A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light | |
| CN102832642B (en) | Control method of quality control system of micro source internetworking electric energy | |
| CN102969732B (en) | Mixed bipolar direct current (DC) transmission system | |
| CN106786643B (en) | Fault current active control type current limiting system and its control method | |
| CN110474307B (en) | Self-adaptive fault component current differential protection method based on current sag detection | |
| CN104009497B (en) | A kind of LVRT Capability of Wind Turbine Generator and active power filter compensating device and changing method | |
| CN106655843A (en) | Cascaded H-bridge PWM rectification system and control method thereof | |
| CN100423396C (en) | Dyamic series voltage compensator with current sharing static switch | |
| CN104578082B (en) | The partition method of dynamic voltage correction device, bearing calibration and load short circuits failure | |
| CN106300430A (en) | A kind of miniature photovoltaic grid-connected inverter and grid-connected control method thereof | |
| Rohouma et al. | Reactive power compensation of time-varying load using capacitor-less D-STATCOM | |
| CN202474863U (en) | Low voltage filtering type dynamic reactive power compensation device | |
| CN112713755B (en) | Quick turn-off method and system for bidirectional thyristor | |
| CN107783010A (en) | A kind of more level active compensation devices of front-end power and control method | |
| CN111934305B (en) | Flexible arc extinction method for single-phase earth fault of power distribution network based on voltage decoupling control | |
| CN203312813U (en) | Novel power quality control system with fault current limiting function | |
| Ali et al. | Study & performance of DVR for voltage quality enhancement | |
| CN203301140U (en) | Transformer direct-current magnetic bias suppression device | |
| CN102201674A (en) | Low-voltage automatic continuous adjustable filtering reactive power compensation device | |
| CN107785914A (en) | A kind of more level active compensation devices of front-end power and control method | |
| CN103084724B (en) | Contravariant accelerating power supply device of electron beam depositing equipment and control method thereof | |
| CN107785908A (en) | A kind of dynamic electric voltage recovery device with short circuit current limitation function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tu Chunming Inventor after: Hou Zun Inventor after: Deng Shu Inventor after: Guo Cheng Inventor after: Li Shengnan Inventor after: Fear of Rising Inventor after: Shuai Zhikang Inventor after: Pan Hong bin Inventor after: Yao Peng Inventor after: Jiang Fei Inventor after: LAN Zheng Inventor before: Tu Chunming Inventor before: Shuai Zhikang Inventor before: Pan Hong bin Inventor before: Yao Peng Inventor before: Jiang Fei Inventor before: LAN Zheng Inventor before: Hou Zun Inventor before: Deng Shu |
|
| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160922 Address after: Yuelu District City, Hunan province 410082 Changsha Lushan Road No. 1 Patentee after: HUNAN University Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, YUNNAN POWER GRID Co.,Ltd. Address before: Yuelu District City, Hunan province 410082 Changsha Lushan Road No. 1 Patentee before: Hunan University |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 |