消除零模波速影响的配电网单端行波故障测距算法.pdf

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1、第44卷第23期电力系统保护与控制、b1．44No．232016年12月1日PowerSystemProtectionandControlDec．1，2016DOI：10．7667／PSPC152169消除零模波速影响的配电网单端行波故障测距算法何晓，雷勇，周聪聪，周凯，王鹏(四川大学电气信息学院，四川成都610065)摘要：配电网线路分支众多，末端往往具有三相不平衡负载，传统的单端行波法需在复杂的折反射波中提取故障点的反射波，不易实现。而基于模量行波速度差和基于线模行波突变这两种故障测距方法的精确度都受制于不稳定的零模波速度。基于此，将两种方法结合，利用零

2、模检测波速度与传播距离成对应关系的特点，获得不受零模波速度影响的故障定位新方法，该方法避免了传统故障测距算法需要多次从复杂的折反射波中提取信息的缺点，能够简洁、快速、准确地对复杂的分支线路进行故障测距。此方法首先检测故障暂态行波的零模和线模分量到达首端的时间差，然后在首端对三相同时注入相同的高压脉冲并检测线模行波首个波头到达检测点的时间，进而利用稳定的线模波速度进行故障距离的测量。最后，利用PSCAD仿真验证了所提方法基本不受故障位置、过渡电阻大小以及故障初相角的影响，各种情况下绝对误差均在100m之内。关键词：配电网；故障测距；零模波速度；小波变换；波头A

3、single—terminalfaultlocationalgorithmindistributionnetworkforeliminatingtheeffectofthevelocityofzero-modetravelingwaveHEXiao，LEIY0ng，ZHOUCongcong，ZHOUKai，WANGPeng(SchoolofElectricalEngineeringandInformation，SichuanUniversity,Chengdu610065，China)Abstract：Dueto~equentlyoccurredthree．

4、phaseunbalancedloadsintheendsoflargenumberofbranchesindistributionnetworks．itiSdificulttoextractreflectedwaveofthefaultpointinthecomplexmflec￡edandrefractedwavesusingthetraditionalsingle-terminaltravelingwavemethods．Simultaneouslytheprecisionofthefaultloeationmethodsbasedonthedifer

5、enceofwavevelocitybetweenzero-．modecomponentandline-modecomponentoftravelingwavesandtheonebasedonmutationofline．modetravelingwavearedecidedbytheunstablezero．modewavevelocity．Therefore，anewapproachisproposedbycombiningtheabovetwomethodstoachievehighereficiencyandprecisionofmeasuring

6、thefaultdistanceandlocation．Thepresentedmethodemploysthecorrespondencebetweenthedetectedzero．modewavevelocityandthefaultdistancetoachievethefaultlocationalgorithmwhichiSnotimpactedbyzero．modewavevelocity．Theapproachfhstlydetectsdiferenceofarrivaltimebetweenthezero-modetravelingwave

7、andline-modetravelingwaveattheheadend．Andthenpost-injectinghighvoltagepulsesintothreephasessimultaneouslyanddetectingthearrivaltimeofthefirst1ine-modetravelingwaveheadattheheadendofthetransmissionline．Following．itemploysthestableline．modewavevelocitytoexecutethemeasurementofthefaul

8、tdistance．Finally,PSCAD．ba