广域测量系统中的PMU布点优化及研究

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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