基于多测点和相位比较的输电线路故障定位方法分析

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1、华北电力大学硕士学位论文AbstractTransmissionlineisanimportantpartofthepowersystem.Thefaultlocationfortransmissionlinesisofgreatsignificancetohelppowerlinemaintenancecrewssearchforfaultpoint,detectetheportioninsulationhiddentroubleoflinestimelyandrestorethelines'tr

2、ansmissionservicewithouttoomuchdelay.Howeverimprovingthefaultlocationaccuracyandreliabilityisabletoshortenthesearchtime,reducethebreakdownmaintenance’sworkload,andtoensurethatthepowersystemsafeandstableoperations.Thisstudyistoimprovetheaccuracyandrelia

3、bilityoftransmissionlinefaultlocation,whichbasedonmultiplemeasurementsandphasecomparisonasthemainline.Tosolvetheproblemthatthereliabilityofcurrentfaultcomponentsphasecomparisonisrelativelylowduetospectralleakage,thispaperproposedanovelfaultlocationsche

4、mefortransmissionlinesbasedonphasecomparisonwithKaiserself-convolutionwindowsFFT.ThisschemeusesFFTprogramtosolvethephasecurrentfaultcomponentofmultiplecurrentmeasurementswhicharecomparedfordeterminingfaultsection;usesexcellentsidelobecharacteristicsofK

5、aiserself-convolutionwindowtorestrainspectralleakage,thenthereliabilityofphasecomparisonwasincreased,andhasthepracticalsignificancetoensureeffectivenessofmulti-measuringpointsoftravelingwavefaultlocation.Thegrounddistributedcapacitanceandmutualinductan

6、ceofEHVdoublecircuitlinecannotbeignored,andhasagreatimpactonthefaultlocation.Afaultlocationschemebasedonphasecomparisonandtravelingwavesoffourmeasurementsispresentedfordoublecircuitlinetoimprovethelocationaccuracyandreliability,whichdeterminesfaultsect

7、ionbasedonthephasecomparison,andmeanstoshortendoubleendsdistance,obviouslydecreasestheattenuation(distributedcapacitance)anddistortion(mutualinductance)ofcurrenttravelingwaves.Inthefaultsectionlocatesthefaultlocationbasedontravelingwavesoffourmeasureme

8、ntswhichiscomposedoftwotravelingwavesofthreemeasurements,achievesonlinedeterminedwavevelocity,andcaneffectivelysolvetheproblemthatphasecomparisonmisjudgmentcausedbypolarityreversedandmeasurements’fault.Sincetheproblemsinthefaultlocation