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电力系统自动化 2012
Impact Analyses of Wind Farm on Performances ofTransmission Line Relay ProtectionKeywords: wind,farm,transmission,line,relay,protection,doubly-fed,induction,generator（DFIG）,real-time,digitalsimulator（RTDS） Abstract: Asimulationsystemforpowergridwithconcentratedlarge-scalewindfarmintegrationisestablishedbasedontheelectro-magnetictransientmodelofwindturbineequippedwithdoubly-fedinductiongenerator（DFIG），whichisbuiltbyreal-timedigitalsimulator（RTDS）.UsingthehardwarecommunicationinterfaceofRTDS，aclosed-looptestingexperimentisaccomplishedtostudytheimpactsoflarge-scalewindfarmsontheexistingrelayprotectiondevicesforwindfarmoutgoingtransmissionline.Thispaperpointsoutproblemsexistingincurrentrelayprotectiondevicesasfollows:faultphaseselectorcanselectunwantedphaseduetothechangesoffaultfeaturescausedbyspecialnetworkconnectionofwindfarms;blockingconditionfordistanceprotectionsneedstobere-examinedduetotheweakpower-feedcharacteristicsofwindfarms;andpowerfrequencyparameterbasedrelayprotectiondevicescannotaccuratelyoperateduetothespecialtransientvoltageandcurrentcharacteristicsofwindfarmsduringfaultperiod.Resultslaythefoundationforimprovingtheperformancesoftheexistingrelayprotectiondeviceanddevelopingnewprinciplerelayprotection.
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