抑制电压波动和闪变的并补控制策略研究

重庆大学硕士学位论文抑制电压波动和闪变的并补控制策略研究姓名：刘方蓝申请学位级别：硕士专业：电气工程指导教师：牟道槐20060401I105083STATCOMIIABSTRACTWiththerapiddevelopmentofthenationalindustrycurrently,amassofcontrolequipmentsbasedoncomputerandroboticizedelectro-facilitieshavebeenputintouseinsuccession.Theindustrialconsumerhaveraisedstricterrequestforpowerquality,sotheproblemofpowerqualitycausesbroadrecognition.Withtheestablishmentofmarketeconomystepbystepinourcountryofferingtop-qualitypowerisveryimportantmatterthatshouldbetakenintoaccountnecessarilyindistributionnetworkdevelopmenttoadaptrequestofpowermarketeconomydevelopmentandenhancecompetitionability.Itisdiscoveredbyresearchthatninetenthspowerqualityproblemcomesfromdistributionnetwork.Statisticaldataindicatesthathighautomatizationuserssuffertentofiftydisturbancesconcernedaboutpowerqualityproblemeveryyear.Thereintotheaccidentscausedbydynamicvoltagequalityinvolvingvoltagefluctuationandflickeraccountforeightythreepercent.Voltagefluctuationandflickerhavebecometheoneofprimarycausesthatthreatenssupplycredibilityofimportantusers.Therefore,themitigationofvoltagefluctuationandflickerisagreatimportantresearchissue.Thisdissertationanalysethebasaltheoryofvoltagefluctuationandflickerandthefunctioncharacteristicofparallelvarcompensationequipments,onbaseofwhichthemathematicalmodelusedtocalculateandanalyzethedynamicprocessofvoltagefluctuationandflickeriscreated,andthenumericalsimulationcalculationandanalyseisdone.Thefollowingcontentsarestudiedprimarily:Thebasicconceptionandgenerationmechanismofvoltagefluctuationandflickerarestudied,andtheharmofvoltagefluctuationandflickerisanalysed.Twocalculationmethodsofvoltagefluctuationareanalysed,whichareshortcircuitvoltagedepressionmethodandmaximalreactivepoweralterationmethod,andtheexamplesarecalculatedusingeachofthem.Theoperatingprincipleofparallelvarcompensationequipmentsisanalysedandcompared,thenumericalsimulationmodelofmitigationvoltagefluctuationandflickerusingvarcompensationequipmentsiscreated,theeffectofmitigationvoltagefluctuationandflickerusingfixcapacitanceanddynamicvarcompensationiscomparedandanalysed.Thefactorofinfluencingthecompensationeffectofdynamicvarcompen-IIIsationequipmentsisdiscovered,thecontrolstrategyofmitigationvoltagefluctuationandflickerandthecalculationmethodofregulationsrangeofvarcompensationequipmentsrequiredtomitigatevoltagefluctuationandflickerareputforward,whichcanbeusedtothevarcompensationplanningofdistributionnetwork.Thedissertationopensouttheproblemofcapacitancecompensationthatusedwidelyindistributionsystemcurrentlyandthenecessityofdevelopingnew-stylestaticsynchronouscompensator(STATCOM)intheaspectofmitigatingvoltagefluctuationandflicker.Keywords:Powerquality,Voltagefluctuation,Staticvarcompensator,Staticsynchronouscompensator1111.1[1]105083[2]207012VoltagefluctuationFlicker[3]0.01Hz30Hz[4][5][6][7]10Hz131.2[8]SVCSTATCOM1990GB12326-9010Hz10V∆100V220VIECIECstPltP10V∆IEC61000-3-72000GB12326-90GB12326-2000[9]SVC[10]SVC(TCRTSC)(TCRFC)SVC14500kVEddyCountyTCR/TSCTSC8.5kV76MVA19924SVC[11]STATCOMSTATCOM(FACTS)STATCOM[12](SVC)2080198020MVASTATCOM19871MVAGTOSTATCOM901991199480Mvar100MvarGTOSTATCOM19997Seattle5Mvar4.16kV(STATCOM)200024000STATCOMSVCSTATCOM1998TEXAS80MvarSTATCOM60Mvar(1ms)SVC(4-5ms)SVCSTATCOMSVCSTATCOM50%SVCSTATCOMSVC1540%19993220kV±20MvarSTATCOM20012±500KvarSTATCOM[13][14][15]1.32622.11s1U2U30ms30msNUd%100%10021×∆=×−=NNUUUUUd2.1voltagefluctuationmaxUminUU∆NU[16]%100minmax×−=NUUUd2.2)(Uuv2.12.1V(a)50Hz(b)10HzFigure2.1Modulationoffluctuationvoltagetopowervoltage(a)50Hzpowercarrierwave,(b)10Hzsineamplitudemodulationwave272.1au50HzdvPP−NUvv10Hz50Hzu2.1bmvd2.12.2avu2.2bv2.2at0vvU/UNt(b)(a)2.2(a)(b)Figure2.2Wave-formsketchmapoffluctuationvoltage(a)Relativevoltagefluctuantcharacteristic(b)amplitudemodulationwavechangecurve2.2[17][18]28123[19]UIEIEC1F(%)S(t)IEC230v60wF(%)F=DCBADC++++×100%2.3ABCDInstanta-neousFlickerSensationLevel50%S=1UnitofPerceptibilityS=1d(%)2.12.3S=1[20]2.32.1S=1Table2.1Voltagefluctuationwhens=1d(%)f(Hz)r(min-1)R(f)K(f)0.5602.3400.5414.550.1071.01201.4320.4713.040.1751.51801.0800.4322.500.2312.02400.8820.4012.200.283292.53000.7540.3742.010.3323.03600.6540.3551.840.3823.54200.5680.3451.650.4404.04800.5000.3331.500.5004.55400.4450.3161.410.5615.06000.3980.2931.390.6285.56600.3600.2691.340.6946.07200.3280.2491.320.7626.57800.3000.2311.300.8337.08400.2800.2171.290.8937.59000.2660.2071.290.9408.810560.2500.1991.261.0009.511460.2540.2001.270.98410.012000.2620.2051.270.96210.512600.2700.2131.270.92611.013000.2820.2231.260.88711.513600.2960.2341.260.84512.014400.3120.2461.270.80113.015600.3480.2751.270.71814.016800.3880.3081.260.64415.018000.4620.3441.260.57916.019200.4800.3801.260.52117.020400.5300.4211.260.47218.021600.5840.4611.270.42819.022800.6400.5061.260.39120.024000.7000.5521.270.35721.025200.7600.6031.260.32922.026400.8240.6571.250.30323.027600.8900.7131.250.28124.028800.9620.7671.250.26025.030001.0420.2402102.3S=1Figure2.3VariationofvoltagefluctuationwithfrequencywhenS=12.18.8Hz230v60wS=10.25%2.3S=16~12Hz2.1)(fR=(%)1(%)1dSdS==2.49Hzπ4