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ID:36507995
大小:1.26 MB
页数:78页
时间:2019-05-11
《广域测量系统中的PMU布点优化及研究》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、华东交通大学硕士学位论文广域测量系统中的PMU布点优化及研究姓名:马勇申请学位级别:硕士专业:电力系统及其自动化指导教师:陈赤培20080420AbstractPLACEMENTOFPHASORMEASUREMENTUNITS(PMU)ISOPTIMIZEDANDRESEARCHINWIDEAREAMEASUREMENTSYSTEMABSTRACTWideareameasurementsystem(WAMS)arehavingbeenanewlydevelopingresearchandadiscus
2、singfieldintheworld,isanimportantphasewhichbringthepowerautomationfromsteadymonitoringtotransientstateandtodynamicsteadycontrollingdevelopment.Theestablishmentofwideareameasurementsystem(WAMS)whichbasesonsynchronizedphasormeasurementunitandmoderncommuni
3、cationtechnologyprovidesanadvancedinformationtechnologyplatform.Itmakesthepowertoreal-timesupervisoryandcontrolwithlargearea.Theaimofthispaperistostudythemethodofsynchronizedphasormeasurementandplacementofphasormeasurementunit,becausephasormeasurementun
4、it(PMU)isanimportantcomponentinthewideareameasurementsystem(WAMS).InthisthesisthesignificanceandprogressofsynchronizedphasormeasurementbasedonGPSareintroducedatfirst,anditsapplicationinthepowersystemispresentedatthesametime.Thenthezero-crossingdetection
5、methodandtheDFTalgorithmadoptedinthephasormeasurementarediscussedindetail.Tominimizetheerrors,somenovelmethodsareincludedinthezero-crossingdetection.Toimprovemeasurementaccuracy,alsoadouble-ratesamplingmethodisproposed.OnerecursiveDFTalgorithmrequiringl
6、esscomputationalworkisinvestigated.Inordertoimprovetheaccuracyofthefrequencymeasurement,themeasurementerrors,whicharecausedbydecayingtheDCcomponent,thefrequencyvariationandetc,arediscussedindetail.Inthefaceoftheproblemssuchasfrequencyshift,harmonic,osci
7、llatingmovementandsoon,amethodbasedonquasi-synchronoussamplingandDFTalgorithmisproposedinthispapertotrackfrequencyandmeasurephase,byanalyzingvariousapproachesforthephasormeasurementwhicharebasedonsynchronizedsamplingorquasi-synchronoussampling.Intheproc
8、essofcalculatingfrequency,theDFTwhichcaneliminatedecayingDCcomponentandlinearinterpolationmethodareusedtocalculatetheestimatedphasoratanytime,andtheiterationmethodisusedtofindoutthetwoestimatedphasorswhoseintervalisoneperiod.Then
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