基于电流双反相量的同杆四回线故障选相方法.pdf

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1、第4l卷第22期电力系统保护与控制Vl01．41NO．222013年11月16日PowerSystemProtectionandControlNOV．16．20l3基于电流双反相量的同杆四回线故障选相方法李博通，李永丽，张朝乾(1．天津大学智能电网教育部重点实验室，天津300072；2．天津市电力公司城西供电分公司，天津300110)摘要：为了解决同杆四回线故障情况复杂，跨线故障时无法应用单回线故障选相方法的难题，提出了一种基于故障电流双反相量的同杆四回线故障选相方法。同杆四回线发生一回线内或两回线间跨线故障时，对四回线各相电流进行变换，可得故障相电流的双同及双反相量。通过对故障电

2、流边界条件的分析可知，不同类型故障时故障电流的3个双反相量分别具有不同的幅值和相位特点。以此为基础，提出了在一回线内故障和两回线间跨线故障时能够准确识别故障回线和故障相的同杆四回线故障选相方法。仿真表明本方法在不同的负载电流、过渡电阻、故障位置及故障类型下均能进行有效的故障选相。关键词：同杆四回线；故障选相；双同相量；双反相量；故障边界条件Anewfaultphasedetectionalgorithmforfour-circuittransmissionlinesonthesametowerbasedondouble-differentialphasorsoffaultcurre

3、ntsLIBo．tongILIYong．1．i．，ZHANGZhao—qian，(1．KeyLaboratoryofSmartGridofMinistryofEducation，TianjinUniversity，Tianjin300072，China；2．ChengxiDistrictPowerSupplyCompany，TianjinElectricalPowerCompany，Tianjin300110，China)Abstract：Thefaultinfour-circuittransmissionlinesiscomplex，andfaultphasedetectiona

4、lgorithmofsinglecircuitlinecannotbeusedforcrosslinefaults．Aimingatthisproblem，amethodforfaultphaseselectionoffour—circuittransmissionlinesonthesan-letowerispresentedbasedondouble-differentialphasorsoffaultcurrents．Four·summinganddouble—differentialphasorsoffaultcurrentscanbecalculatedusingacer

5、taintransformationmatrixforline-lineparameterdecouplingoffourcircuitlines．Accordingtofaultboundaryconditions，theamplitudeandphaseofthreedouble—differentialphasorsoffaultcurrentsarestudiedunderconditionsofdifferenttypesoffaults．Basedonthis，anovelmethodologyforfaultphasedetectionforfour—circuitt

6、ransmissionlinesonthesametowerisputforward，whichCanpickoutthefaultphasesnomatterthefaultOCCURSinsinglelineorcrossdoublelines．SimulationresultsvalidatethatthemethodologyiScorrectandreliableunderdifferentconditionsof1oadcurents．transientresistances，faultpointlocationsandfaulttypes．Thisworkissupp

7、ortedbyNationalNaturalScienceFoundationofChina(No．51277130andNo．51207102)．Keywords：four-circuittransmissionlinesonthesametower；faultphaseselection；four-summingphasor；double—differentialphasor；faultboundarycondition中图分类号；TM762文献标识码：A文章编号