大型发电机干扰下发电机保护的性能

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1、EnglishMaterial:PerformanceofGeneratorProtectionDuringMajorSystemDisturbanceAbstract：Disturbanceis aninherentpartofeasypowersystemduringthetransitionfromonesteady-stateoperatingconditiontothenext.Protectiverelaysmayexperienceabnormaloperatingconditionsdu

2、ringthistransientperiod.Thispaperreviewscontrolactionsdratplayapartduringthetransitionandprovidestechnicalguidancetotheindustryontheapplicationandsettingofgeneratorprotectiverelaysthatcanoperateduringmajorsystemdisturbances.IndexTerms：ACgeneratorexcitati

3、on、acgeneratorprotection、governors、powersystemcontrolturbines.Ⅰ.INTRODUCTION：Everypowersystemissubjectfromtimetotimetotransientdisturbancesprimarilyduetofaultsand/orswitchingofmajorload.Normally,thesystemadaptstoanewsteady-stateconditionwiththehelpofgene

4、ratorexcitationandturbinegovernorcontrolsystems.Avarietyofadditionalpowersystemcontrolschemesmayalsobeusedtohelprestoreanacceptablenewsteady-statecondition.Oneofthelessonslearnedfromthepastmajordisturbancesisthatsomeofthefunctionsassociatedwithgeneratorp

5、rotectionmayoperateduringthesetransientconditions.Itisimportantfortherelaystoprovideprotectionwhileoptimizingtheircoordinationtoavoidundesirableoperationduringthesystemdisturbancesandtherebyhelppreservetheintegrityofthepowergrid.Briefdescriptionsofpastpo

6、wersystemdisturbancesaswellasgeneratorexcitation,turbinegovernor,andpowersystemcontrolsareincludedinthispaper.Thebalanceofthepaperdiscussesthegeneratorprotectionfunctionsthatmayoperateduringsystemdisturbances.Ⅱ.POWERSYSTEMDISTURBANCES：Powersystemdisturba

7、ncesareeventsthatproduceabnormalsystemconditionsandthestateofthesystemmaychangefromnormaltoemergency.Thesedisturbancescanbeclassifiedintotwogroups-smallandlarge.Largedisturbancesareachallengingproblemfortheutilitiesbecauseofthesizeandcomplexityofthepower

8、system.Adequateprotectionandcontrolactionsarerequiredafterasystemdisturbancetopreventfurtherdegradationofthesystemandrestorationtothenormalstate.Manysystemdisturbancescanbeattributedtotightoperatingmarginsandlessredundancy