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1、第x卷第x期电测与仪表Vol.xNo.xx年第x期ElectricalMeasurement&InstrumentationDec.x10kV配电网单相接地故障综合定位法严凤,李双双,楚非非(华北电力大学电气与电子工程学院,河北保定071003)摘要:中性点不接地的系统运行方式广为我国10kV配电网所采用,发生单相接地故障时,流经对地电容的故障电流较小,使得故障信号难以捕捉,加之网络分支较多,故障定位难以实现。为了解决快速定位的问题,提出了C型行波与决策树相互结合的综合故障定位法。首先利用C型行波在故障测距中的优势与经验模态分解(EmpiricalModeDecomposition,EMD
2、)的去噪功能,确定故障点与测量端之间的距离;其次利用决策树的分类功能针对网络多分支的特点,对线路不同区段进行分类,判断故障信号来源,并通过与BP神经网络与RBF神经网络的判断结果进行对比表明:C型行波与决策树相互结合的方法能够准确地对带有多分支的10kV配电网进行单相接地故障的快速定位。关键字:10kV配电网;单相接地故障定位;经验模态分解;C型行波;决策树;BP;RBF中图分类号:TM86文献标识码:B文章编号:1001-1390(2015)00-0000-00Acompositesinglephasegroundingfaultlocationmethodfor10kVdistribu
3、tionnetworksYanFeng,LiShuangshuang,ChuFeifei((SchoolofElectricalandElectronicEngineering,NorthChinaElectricPowerUniversity,Baoding071003,Hebei,China))Abstract:Inchina,10KVdistributionnetworksmostlyadopttheneutralnon-groundedwayinchina,andtheyhavelotsofbranches.Whenthesinglephasegroundingfaultoccur
4、s,thefaultcurrentisflowingthroughthecapacitanceofconductorstoearth,andthesignalistooweaktobecaptured.Meanwhile,theyalsohavelotsofnetworkbranches,sothefaultlocationisdifficulttoachieve.Inordertofindthefaultpointquickly,acomprehensivemethodwhichcombinedC-typeoftravelingwaveanddecisiontreeisproposed.
5、ThefirststepofthemethodisusingtheadvantagesofC-travelingwavefaultlocationmethodindistancemeasuringandthenoiseeliminationfunctionofEmpiricalModeDecomposition(EMD)todeterminethefaultdistance;Thesecondoneistofindoutfindingthefaultsectionbyusingthedecisiontree.Bycomparingcomparedwiththejudgingresultso
6、fBPandRBFneuralnetwork,itshowsthat:themethodbasedondecisiontreecandeterminethesinglephasegroundingfaultpointin10KVdistributionnetworkswithbranchesquicklyandaccurately.Keywords:10kVdistributionnetwork,singlephasegroundingfaultlocation,empiricalmodedecomposition,C-typeoftravelingwave,decisiontree,BP
7、,RBF第x卷第x期电测与仪表Vol.xNo.xx年第x期ElectricalMeasurement&InstrumentationDec.x0引言配电网将输电网与地区发电厂处的电能按照合适的电压等级分配给各类用户,承担着电能的分配任务,是电力系统的重要组成部分。在我国,10kV配电网主要采取中性点不接地的方式运行,是大多城市电网的主干支撑。根据有关统计,单相接地故障占配电线路总故障的80%以上,而且其他两相甚至三相故障