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ID:41567353
大小:163.78 KB
页数:16页
时间:2019-08-27
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1、附录附录一英文资料RecentadvancesinvarcompensatorsG]〜ZAJOOS•DepartmentofElectricalandComputerEngineering,ConcordiaUniversity1445,deMaisonneuveW,Montreal,CanadaH3G1M8e-mail:geza@ece.concordia.caAbstrac仁Staticvarcompensatorshavebeen,formanyyears,anessentialcomponenti
2、ntheoperationofpowertransmissionsystems.TheyarepartofafamilyofdevicesknownasFlexibleACTransmissionSystem(FACTS)devices.Theadventoflargecapacityforce-commutatedsemiconductorswitchesallowsmanydevelopmentsinpowerelectronicconverterstobeappliedtotheimplemen
3、tationofhighpowercompensators.Thispaperdescribestheprinciplesofco・ntrolledreactivepowercompensation,particularlyinthecontextofpowersyst・ems.Itfocusesonactivestaticpowerconverter-basedcompensatorsanddiscussesissuerelatedtothepowercircuittopologyandcontrol
4、techniquesincludingtheimpactofPulseWidthModulation(PWM)techniques.Compensatorsbasedoncurrentandvoltagesourceconvertersandonaccontrollers,bothintheshuntandseriesconfigurations,arecovered.Methodstoenhancepowercapacityusin・gmulti-levelandmulti-pulsearrangeme
5、ntsarediscussed.Keywords.Reactivecompensation;powerelectronicconverters;powersystems.1.IntroductionReactivepower(var)compensationhaslongbeenrecognizedasanessentialfunctionintheoperationofpowersystems.Atthedistributionlevel,itisusedtoi--mprovethepowerfacto
6、randsupportthevoltageoflargeindustrialloads,suchaslinecommutatedthyristordrivesandelectricarcfurnaces.Reactivepowercompensationalsoplaysacrucialroleatthetransmissionlevelinsupportingthe1--inevoltageandstabilizingthesystem.Rotatingsynchronouscondensersand
7、m-echanically-switchedcapacitorandinductorbankshavebeenreplacedinthe1970sbythyristor-basedtechnologies:intypicalinstallations,athyristor-contro・liedreactor(TCR)providesvariablelaggingvars,andfixedorthyristorswitchedcapacitors(TSC)providetheleadingvars.The
8、combinationofbothdevicesinparallelallowscontinuouscontrolofvarsoverawiderangeofvalues,fromlea-dingtolaggingvars(Gyugyi1979).Alargenumberofunitshavebeensucces-sfullyinstalledandoperatedformanyyears.Atthesametime,thep
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