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1、ACoordinatedControlSchemeforPowerDemandChangesinaPMSGBasedMulti-TerminalDCWindFarmShixiongFanJinYangWeiweiMaGuangyiLiu,BarryWWilliamsChinaElectricPowerSchoolofEngineeringStateGridSmartGridZhanyongYangUniversityofResearchInstituteandAppliedScienceResearc
2、hInstituteChinaElectricPowerStrathclydeBeijing,ChinaAstonUniversityBeijing,ChinaResearchInstituteGlasgow,UKBirmingham,UKBeijing,ChinaE-mail:j.yang8@aston.ac.ukAbstract—Althoughmaximumpowerpointtracking(MPPT)althoughthepossibleadjustmentrangeislimited.is
3、crucialinthedesignofawindpowergenerationsystem,theNevertheless,alarge-scalegigawattwindfarmwillhaveanecessarycontrolstrategiesshouldalsobeconsideredforcollectivecapabilitysufficientforfrequencycontrol.Themainconditionsthatrequireapowerreduction,calledde
4、-loadinginchallengeistodesignasmoothpowerde-loadingschemeforthispaper.Acoordinatedcontrolschemeforaproposedcurrentthewindfarm,duringwhicheachturbineoperatingpointwillsourceconverter(CSC)basedDCwindenergyconversionsystembeshiftedfromtheMPPTcurve.Fig.1sho
5、wswindturbineispresentedinthispaper.ThisschemecombinescoordinatedoperationwhenitmovesawayfromtheMPPTcurve:therotorcontrolofthepitchangle,aDCloaddumpingchopperandthespeeddecreases(under-speeding)ontheleftside,whilerotorDC/DCconverter,toquicklyachievewind
6、farmde-loading.speedincreases(over-speeding)ontherightside.Theover-MATLAB/Simulinksimulationsandexperimentsareusedtospeedingcaseispreferablesincethisgivesimprovedsmallvalidatethepurposeandeffectivenessofthecontrolscheme,bothsignalstability[4].Windfarmou
7、tputpowercanbereducedatthesamepowerlevel.throughpitchcontrol[5]orconvertercontrol[6].SincewindKeywords—De-loading;current-sourceconverter(CSC);DCfarmstart-uptimeisshorterthanotherpowerstations,suchaswindfarm;windpowergenerationcoal-firedstationsoranucle
8、arpowerstation,de-loadingawindfarmisanoptionformaintainingpowerbalance.I.INTRODUCTIONDe-loadingofwindturbinesmeansnotalloftheavailableGenerally,windturbines(WTs)arecontrolledtooperatewindenergyisconvertedintogridelectricity.Inord
