地铁接触网故障测距分析与实现

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1、AbstractMetrohasanobviousadvantagetoimproveurbanpublictransportpressure，andnowinChinamanybigcitiesaremakinggreateffortstobuildmetro．Metrotractionlinesystemfaultisacommonfaultinactualoperation，inordertoreducethelossesbecauseofoutageitisimportanttoensureDCt

2、ractionlinesystemsecurityandstability,andtoquicklyachievefaultlocationandrenewnormalpowersupply．Sointhispaperwedeveloptheresearchaboutmetrocatenaryfaultlocation，andthemainfaultsimulationisabouttofeedercable，slow-impedancefault，high—impedancefaultandcatena

3、rymainline’Sshort．circuitfault．Inthispaperwegiveabriefintroductionaboutthestructureofmetrotractionpowersupplysystemandthesignificanceofmetrocatenaryfaultlocation．Faultanalysismethod(impendaneemethod)andtravelingwavemethodarethemainfaultlocationmethodsforp

4、owersystemtransmissionline，boththemethodshavetheirownapplicabletransmissionlines，accuracyandcorrelationalgorithms．CombinationmetrocatenarylinethisthesisdecidestousetravelingwavemethodtoachievefaultlocationanddiscussitsapplicabilitvinDCshort-distancepowert

5、ransmissionlines．Itisgivenadetailedexpatiationonthebasictheoryoftravelingwaveinthispaper,bythemodelofuniformlosslessconductorwedosomemathematicaldeducesonwavevelocity,waveimpedance，waveequationandtravelingwaverefractionandreflection．Alsoithasinstructionsf

6、orsomekeytechnologyproblemsandtheirsolutionsintravelingwavemethodfaultlocation．Wavelettransformtheoryprovidesagoodmathematicalfoundationfortherealizationoftravelingwavefaultlocation．Throughwavelettransformwefindouttransientsingularpointsoftravelingwavesig

7、nal，andthesingularpointscorrespondtowavelettransformmodulusmaximapoints．Fromthesingularpointsweacquiretimeinformationonfault，thencalculatethefaultdistancebasedontimeinformation．Thewavelettransf．onllhasbeenwidelyusedinpowersystemtransmissionlineswavetravel

8、ingmethodfaultlocation．ThisthesisgivestheequivalentmathematicalmodelofmetroDCtractionlinesystem．andcalculatesDC-sideshort-circuitcurrent．UsingMATLAB／SIMULINKwebuildametrotractionpowersupplysystempulserectifiersimula