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ID:36519227
大小:1.54 MB
页数:61页
时间:2019-05-11
《行波法在铁路自闭贯通线故障测距中应用的几个关键问题研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中图分类号:TM726,TM773西南交通大学研究生学位论文年级三QQ垂丝专二oO七年三月西南交通大学硕士研究生学位论文第n页行波来进行自闭贯通线路故障测距。该结果表明电压行波测距原理在自闭贯通线中具有适应性。最后,针对由于自闭贯通线架空线一电缆混合线路波速度不一致而难以精确测距的问题,在分析混合线路连接点处行波传播特点的基础上,采用了一种基于时问差搜索的双端行波测距方法。利用连接点处行波到达线路两端时间差的不同来确定故障发生在线路中的区段和相应的波速度,再进行精确测距。仿真结果表明所提出的方法对于架空线一电缆的混合线路是可行的。本论文的工作对基于行波法的自闭贯通线故障测距装置的研
2、制起到一定的作用,具有一定的理论价值和实际意义。关键词:自闭贯通线;PSCAD/EMTDC;小波变换;行波;故障测距:GPS;电磁式电压互感器;电缆一架空线混合线路西南交通大学硕士研究生学位论文第111页AbstractAsanimportantpartofrailwaypowersystem,railwayautomaticblockingandcontinuoustransmissionlines(RABCL)isresponsibleforthepowersupplyofrailwaysignalsandstationequipments.Itsfaultwouldeffec
3、tnormalrailwaytransportation,evenbringgreatfinancialloss.Therefore,reliabilityofRABCLpowersupplyistreatedimportantHowever,RABCLcouldbeaffectedeasilybyenvironment,anditsfaultoftenhappens.Inordertomanagefaultsituationandenhancerailwayoperationquality,findingandclearingfaultquicklyisneeded,SOfaul
4、tmeasurementandlocationareneededurgently.BasedonstudyofRABCLcharacteristicanditsfaultlocationresearchactuality,thepaperpointsoutthepossibilitytousetravelingwaveinRABCLfaultlocation,buttherearestillsomekeypointswhichneedsmoreanalyzing.Onthebaseofintroductionoffaulttravelingwavefaultlocationtheo
5、ry。aPSCAD/EMTDCmodelofRABCLissetanditstravelingcharacteristicsareanalyzed.TheoryanalysisandsimulationresultsshowthatRABCLisfittousedouble—terminalvoltagetravelingwaveandDfaultlocationprinciple,andpointoutthegettingtravelingwavesignalmodel.GPStimesynchronizationmodeoffaultlocationsystembased0nt
6、ravelingwaveandthecausethatGPSsecondplusturnsoutofstepsareanalyzedinfaultlocationsystembasedtravelingwaveofRABCTL.Thenmodifiedarithmeticisgivenwhichisusedtoreduceout·of-stepsofplussignalsfromtwoterminalswhenGPSsecondplussignalsarcreceiptednormally.WhenGPSsecondplussignalscouldn’tbereceiptednor
7、mally,GPSsecondplussignalsarereplacedbyassistanttimesystemconsistedofbackupclockmoduletOsynchronizecrystaltimesignals,inordertorealizetwoterminaltimesynchronization.Inthispaper,BymeansofsoftwarePSCAD/EMTDC,anequivalent西南交通大学硕士研究生学位论文第1v
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