含分布式电源的配电网故障特性分析与保护技术分析word格式论文.docxVIP

基于提出的保护方案，分别就分布式电源接入对前加速和后加速两种自动重合闸方式所带来的问题进行了分析。结果表明，分布式电源接入对后加速重合闸方式无影响，而对于前加速方式，当本线路分布式电源下游发生故障时，不能实现故障穿越运行，可能会导致重合闸失败。文章据此也提出了相应的改进措施，通过对跳闸方案中的修正矩阵做适当修改来解决这一问题。提高了分布式电源故障穿越运行能力以及避免了分布式电源接入给自动重合闸带来的故障点无法熄弧和非同期重合闸问题。论文最后对全文进行了总结，并对下一步的研究工作进行了展望。关键词：配电网；继电保护；分布式电源；双馈式风力发电机；故障特性分析；区域保护方法；自动重合闸AbstractAsanewtypeofpowergenerationtechnology,distributedpowergenerationprovides aneffectivetechnologyforthecomprehensiveutilizationofenvironmentalfriendly energy, suchaswind,solar,biomassenergy,naturalgasandhydrogen,throughthescattered buildingsmallormicropowergenerationsystem.Thedistributedpowergeneralaccessof lowvoltagedistributionsystem,anditwillchangethetraditionalsinglepowerradiant powerdistributionsystemnetworkstructureandleadtothecurrent,voltagecharacteristic significantlychangedafterfault,sothatmakethetraditionaldistributionnetworkfault analysismethod,relayprotectionandautomaticreclosingtechnologydifficulttomeetthe safetyofpowergridoperationrequirements.Thispaper,basedonfailurecharacteristics analysisofthedistributedpowerandcombiningwiththedevelopmentoftheintelligent distributionnetwork,researchthedistributionnetworkprotectionandautomaticreclosing technologythat adapt to thedistributed powersupplyscale accessing.Thefaultcharacteristicanalysisofdistributedpoweristhefoundationoftherelay protectionresearch.Takingthedoubly-fedwindpowergenerator(DFIG)asthekeypoint, thispaperhasresearchedtheshortcircuitcurrentcharacteristicsofDFIGduringexternal systemfault.BecauseofDFIGgenerallyholdonCrowbarprotection,andCrowbar protectionactionornothavegreatinfluenceontheshortcircuitcurrentofDFIG,therefore, thestudyoftheDFIGs short circuit current characteristics should research from two aspectsrespectively.Forremotefault(Crowbarprotectionnotaction),thispaperbasedon thestatorvoltageorientedvectorcontrollerastheprototype,analysestheinfluenceof doubly-fedexcitationcontrollerfeaturesonshortcircuitcurrent.TheDFIGstatorfault currentanalyticalexpressionwasgiven,andverifiedtheaccuracyofthetheoreti