广域测量系统在电力系统中的应用分析

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1、上海交通大学硕士学位论文ABSTRACT(MinimalSpanningTree)algorithm.Thisalgorithmisbasedonthegraphtheoryandinnovativelyproposesthesearchingrules:searchthebusestofurthestoverlaythegrid.Andthismethodcanimprovethequalityofthesolutionsandthecomputingspeed;alsoachievethesolutions’variety.The

2、resultsoftheexamplesimulationshow:MSTovercomesthedisadvantagesofDFSandSA,butkeepstheadvantagesofthem;itcanacquireanexcellentbalancebetweentheastringencyofthesolutionandthecalculationspeed.InthePMUoptimalpalcementforNewEngland39-busgrid,fromtheMSTalgorithm,using9(23%ofth

3、ebuses’totalnumber)PMUcanrealizethegridobservability,whichiseasytoapplyintherealgrid.2)Thetraditionalmethodsoffaultlocalizationusetheperfectlineparameters.Thesemethodshavedifficultiesinfurtherimprovingtheprecisionbecauseoftheunstablelineparameters.Tosolvethisproblem,thi

4、sthesisproposesusingPMUtocalculatethedynamiclineparameters:usethesynchronousnodevoltageandlinecurrentphasordataandthelonglineequationstocalculatetherealtimelineparameters.Thismethodcanavoidthefaultlocatingerrorcausedbytheparametersunstable.Thenbuildaprecisemodelforthetr

5、ansmissionlines,whichconsidersthedistributedlinecapacitor.ThenewproposedfaultlocalizationalgorithmisbasedonthePMUtwoendsdata,notsubjectedtotheoperationmodes,environment,第V页上海交通大学硕士学位论文ABSTRACTdistributedcapacitor,faultresistanceandfaultlocationandachieves99.95%precision

6、.Thesimulationresultsillustratethecorrectnessandaccuracyofthisnewmethod.3)AninspectingindexoftheonlinevoltagestabilitybasedonthePMUrealtimemeasurementdataisresearched.Tosolvethevoltageunstableproblemcausedbythelossofreactivepower,proposeaninspectingindexoftheonlinevolta

7、gestabilitywhichconsidersthedistributedcapacitor.Calculateandgivetheequationofthisindex.Becausethelinemodelofthisindexismoreaccurate,theindicationeffectisbetterthanotherindexes.Anditsindependencetotheinactivepowerdirectionmakesitsalgorithmsimpleandeasytorealizeonthecomp

8、uter.TheresultsoftheIEEEexampleshow:usingthisindex,theonlinevoltageinspectioncanberealizedonlyaccordingtothePM