简介:Toanalyzetheinfluenceof±400kVQinghai-TibetHVDCtransmissionsystemontransmissionlineprotectionsinQinghaiACpowersystem,aclosed-loopsimulationsystemwasconstructedbycombingHyperSimsystemwithHVDCcontrolprotectiondevices.Variousfaultsondouble-circuit750kVandmulticircuit330kVACtransmissionlinesinQinghaipowersystemweresimulated.TheimpedancecharacteristicsandharmoniccomponentsatQinghaisideofQing-TibetDCtransmissionlinewereanalyzed.TheharmonicproportioninvoltagesandcurrentswerestudiedforfaultsthattookplaceatdifferentlocationsneartheDCsystem.TheinflenceofQing-TibetDCsystemonthedirectionalcomponentsofprotections,differentialprotectionsanddistanceprotectionsofACtransmissionlineswasdiscussedanddrewtheconclusionsthattheDCsytemhadlittleinfluenceondifferentialprotections,whilehadgreatinflenceondirectionalcomponentsanddistanceprotection.TheconclusionscanprovidereferenceforstudyingtheinteractionbetweenACandDCsystems.
简介:Thetransmissionproject-Qinghai-Tibet750kV/±400kVAC/DCinterconnectionprojectkickedoffsimultaneouslyinGolmudofQinghaiandLhasaofTibetinJuly2010.Thispowertransfercorridor,withawholelengthof1774km,isscheduledtobecompletedbytheendof2012,whichwillthenrealizetheinterconnectionbetweenNorthwest(Qinghai)gridandTibetangridforthefirsttime.