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1、柔性直流配电网故障分析戴志辉葛红波严思齐王增平陈曦分布式储能与微网河北省重点实验室(华北电力大学)网保定盤电^司发展策划部柔性直流配电网故障特性分析是保护方案设计的棊础。当前，直流系统故障期间,换流器IGBT不闭锁时的故障特性尚未深入探讨。首先，确定直流配电网的接地方式和控制策略。其次，分析1GBT不闭锁时直流极间短路和单极接地短路的故障特性及过渡电阻等因素的影响，并讨论故障对其他IX域的影响。结果表明，对于极间短路，除故障达到稳态后TGBT闭锁较之不闭锁会出现极间电压和故障电流增大的现象外，IGBT闭锁与否对故障特性影响不人;对于单极
2、接地短路，IGBT不闭锁会使直流侧出现不平衡电压，导致换流器交流侧电流出现直流分量。最后，在PSCAD/EMTDC中搭建仿真模型，证明了理论分析的正确性。关键词：直流配电网;接地方式;故障分析;极间故障;单极故障;基金：国家重点研发计划专项课题(2016YFB0900203)FaultAnalysisofFlxibleDCDistributionSystemDaiZhihuiGeHongboYanSiqiWangZengpingChenXiKevLaboratoryofDistributedEnergyStorageandMicrogr
3、idofHebeiProvinceNorthChinaElectricPowerUniversity;DevelopmentandPlanDepartmentBaodingPowerSupplyCompanyofStateGridCorporationofChina;Abstract：ThefaultanalysisofflexibleDCdistributiongridsisthebasisofdesigningtheprotectionscheme.Uptonow,thefaultcharacteristicofDCfault，co
4、nsideringunblockedTGBTinconverters,hasnotbeensystematicallyinvestigated.Firstly,thegroundingmodeandthecontrolstrategyoftheDCdistributiongridweredetermined.Secondly,onthepremisethatIGBTisunblocked,thispaperanalyzedfaultcharacteristicsofpole—to-polefaultandpole-to-groundfa
5、ult,aswellastheinfluenceoffaultresistance.TheimpactsofDCfaultsonothersectionswerealsodiscussed.Theresultsshowthat,withregardtothepole-to-polcfault,whetherIGBTisblockedornotdoesnotaffectthefaultcharacteristicevidentlyinthefirsttwotransientstages.However,whenthefaultreache
6、sthesteadystate,comparedwiththeconditionthattheIGBTisunblocked,theDCvoltageandfaultcurrentarelargerwhentheTGBTisblocked.Intermsofthepole-to-groundfault，theunblockedIGBTwouldresultinDCunbalancevoltage,whichwillfurthergenerateDCcomponentsintheac-sidecurrentoftheconverter.F
7、inally，thesimulationmodelwasbuiltinPSCAD/EMTDC,andtheresultconfirmsthevalidityofthetheoreticalanalysis.Keyword：DCdistributionnetwork;groundingmode;faultanalysis;pole-to-polefault;pole-to-groundfault;0引言当前，基于电压源换流器(VoltageSourceConverter,VSC)的柔性直流输电技术已广泛应用于高电压等级的输电系统，随着电力
8、电子技术的发展，将VSC应用于中低压电压等级的配电系统-柔性直流配电网(FlexibleDCDistributionNetworks,FDCDN）成为新的研究热点。FDCDN具有便于接纳新能源发电及直流负荷
