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外文翻译--风电对电力系统角稳定性的影响.doc

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外文翻译--风电对电力系统角稳定性的影响.doc

1英文原文ImpactofWindPowerontheAngularStabilityofaPowerSystemAbstractWindenergyconversionsystemsareverydifferentinnaturefromconventionalgenerators.Thereforedynamicstudiesmustbeaddressedinordertointegratewindpowerintothepowersystem.Angularstabilityassessmentofwindpowergeneratorisoneofmainissuesinpowersystemsecurityandoperation.TheangularstabilityforthewindpowergeneratorisdeterminedbyitscorrespondingCriticalClearingTimeCCT.Inthispaper,theeffectofwindpoweronthetransientfaultbehaviorisinvestigatedbyreplacingthepowergeneratedbytwomaintypesofwindturbine,increasinggraduallyarateofwindpowerpenetrationandchangingthelocationofwindresources.Thesimulationanalysiswasestablishedona14busIEEEtestsystembyPSAT/Matlab,whichgivesaccesstoanextensivelibraryofgridcomponents,andrelevantwindturbinemodel.KeywordAngularStability,CCT,WindTurbine,WindPenetration,PSAT.IntroductionApowernetworkisacomplexsystem,whichisvulnerabletodisturbances.Atransientshortcircuitfaultisaverycommondisturbanceinapowersystem1.Itupsetstherotatingmachinesinthevicinityofthefault,causingthespeedsofthesemachines,andthepowerflowsinthenetworktooscillate.Whentheshortcircuitisclearedbydisconnectingthefaultedline,thegeneratorsthathaveacceleratedwilldecelerateandcomebackintosynchronismwiththerestofthesystem.Iftheydonot,andthesystembecomesunstable,thereisariskofwidespreadblackoutsandofmechanicaldamagetogenerators.SothecriticalclearingtimeCCTisthemaximumtimeintervalbywhichthefaultmustbeclearedinordertopreservethesystemstability2,3.Thereisnodoubtthatwindpowerwillplayapredominantroleinaddingcleanandnonpollutingenergytothecountrysgrid.However,asmorewindturbinesareconnectedtothegrid,theirimpactonthepowerqualityofservicespopulatedwithwindgenerationisbecomingmoreevident,soitisimportanttoanalyzethetransientstabilityofpowersystemincludingwindpowerstations4.Athreephasefaultisappliedtoa14busIEEEtestsystem,andclearedbydisconnectingtheaffectedline.Inthispaper,thefocusislimitedtodetermineCriticalClearingTimeCCTfortheseveralcasesbyobservingthetransitbehaviorsimulationofatestsystemduringgridfaultsusingaMatlabpowersystemanalyzetoolboxPSAT5.Thestructureofthispaperisasfollows.First,thewindmodelisdescribedbrieflyalsothewindturbineconceptsaredescribed.Then,thetestsystemandtheappliedmodelsarepresented.2TheoscillationofagroupofgeneratorsduringafaultisanalyzedbyobservingthetransientbehaviorforfollowingcasesAChangingawindsourcelocates.BDifferentgeneratortechnologies.CIncreasinggraduallyarateofwindsourcespenetration.Toconclude,theresultsareclarifiedonthebasisofexistingtheoriesandcomparisonbetweendifferentcasesinordertochooseabestcaseandavoidaworseone.WindModelWindenergyistransformedintomechanicalenergybymeansofawindturbinewhoserotationistransmittedtothegeneratorbymeansofamechanicaldrivetrain.Thewindpowerequation6,7isgivenbyPt1/8ρπd2v3Cpwhereρistheairdensity,ristheturbineradius,νisthewindspeed,andCpistheturbinepowercoefficientwhichrepresentsthepowerconversionefficiencyanditisafunctionoftheratiooftherotortipspeedtothewindspeed,termedasthetipspeedratioTSR.Suchdisturbancesarethemostcommoninthegrid,thegriddisturbancesconsideredinthispaperareofshortduration,maximumafewhundredsofmilliseconds.Sincetheconsideredgriddisturbancesaremuchfasterthanwindspeedvariations,thewindspeedcanheassumedconstant.Therefore,naturalwindvariationsneednotbetakenintoaccount.Thewindspeedissettoaconstant15m/s.TurbineModelsTherearemanydifferenttypesofwindturbinesinusearoundtheworld,eachhavingitsownlistofbenefitsanddrawbacks8.InthispapertwomaintypesofwindturbinesaretakenintoaccountAconstantspeedwindturbineFig.1a,whichconsistsofagridcoupledshortcircuitedinductiongenerator9.Thewindturbinerotorisconnectedtothegeneratorthroughagearbox.Thepowerextractedfromthewindislimitedinhighwindspeedsusingthestalleffect.Noactivecontrolsystemsareused.AvariablespeedwindturbinewithwoundrotorinductiongeneratorFig.1b–doublyfedinductiongeneratorDFIG.Therotorwindingissuppliedusingabacktobackvoltagesourceconverter10.Asinthefirstcase,thewindturbinerotoriscoupledtothegeneratorthroughagearbox.Inhighwindspeedsthepowerextractedfromthewindislimitedbypitchingtherotorblades.3Figure1a.SquirrelcageinductiongeneratorFigure1b.DoublyfedinductiongeneratorTestSystemThetestsystemforthisstudyispresentedinFig.2,itisderivedfromIEEEtestsystemthisnetworkconsistsof14buses,5generators,11loadsand83branches.Thetransformersconnectinggeneratorstothegridareadjustedaccordingly.Windturbinesarethe2MWmachinesdescribedaboveinsection2.NotethatthegeneratorsdonotrepresentasinglemachinebutagroupofstronglycoupledgeneratorsandforthistestsystemthetotalpowerisdividedasfollowTable1.ActivepoweroftestsystemgeneratorsGeneratorN°12345PowerMW61560602525ThedisturbanceinvestigatedisathreephaseshortcircuitonBusnumber2.Thisthreephase4faultrepresentsthemostseveredisturbancefortransientstabilityproblems.ItmustbenotedthatallsimulationsaredevelopedbyPSATversion2.0.0β1.ResultsandDiscussionsImpactofLocationInordertoassumetheimpactofthewindpowertoangularstabilityofpowersystem,weincludedathreephasesymmetricalfaultthenwecalculatetheCCTcorrespondingtoacasewithoutwindsourceandotherscaseswhereawindsourceisconnectedtotestsystembydifferentBuses.Figure2.BasecaseWithoutaWindSourceTheBaseCaserepresentsthenormaloperationofthesystemwithoutanywindpowerconnectedtothesystem.ThecriticalfaultclearingtimeCCTcanbedeterminedusingtransientsimulations3.Forthiscase,theresultisCCT196ms.Fig.3showsthespeedgeneratorsincomparisonforafaultclearingtimeclosetothecriticalclearingtime.InFig.3b,thefaultintroducedhasdurationoft197ms,sothetimeisexceedingthestabilitylimitofCCT.

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