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1、THESISFORTHEDEGREEOFDOCTOROFPHILOSOPHYAnalysis,ModelingandControlofDoubly-FedInductionGeneratorsforWindTurbinesANDREASPETERSSONDivisionofElectricPowerEngineeringDepartmentofEnergyandEnvironmentCHALMERSUNIVERSITYOFTECHNOLOGYGoteborg,Sweden2005¨Analysis,Mode
2、lingandControlofDoubly-FedInductionGeneratorsforWindTurbinesANDREASPETERSSONISBN91-7291-600-1cANDREASPETERSSON,2005.DoktorsavhandlingarvidChalmerstekniskahogskola¨Nyserienr.2282ISSN0346-718xDivisionofElectricPowerEngineeringDepartmentofEnergyandEnvironmen
3、tChalmersUniversityofTechnologySE-41296Goteborg¨SwedenTelephone+46(0)31-7721000ChalmersBibliotek,ReproserviceGoteborg,Sweden2005¨Analysis,ModelingandControlofDoubly-FedInductionGeneratorsforWindTurbinesANDREASPETERSSONDivisionofElectricPowerEngineeringDepa
4、rtmentofEnergyandEnvironmentChalmersUniversityofTechnologyAbstractThisthesisdealswiththeanalysis,modeling,andcontrolofthedoubly-fedinductiongener-ator(DFIG)forwindturbines.Differentrotorcurrentcontrolmethodsareinvestigatedwiththeobjectiveofeliminatingthein
5、fluenceofthebackelectromotiveforce(EMF),whichisthatof,incontrolterminology,aloaddisturbance,ontherotorcurrent.ItisfoundthatthemethodthatutilizesbothfeedforwardofthebackEMFandso-called“activeresistance”managesbesttosuppresstheinfluenceofthebackEMFontherotorcu
6、rrent,particularlywhenvoltagesagsoccur,oftheinvestigatedmethods.Thismethodalsohasthebeststabilityproperties.Inadditionitisfoundthatthismethodalsohasthebestrobustnesstoparameterdeviations.TheresponseoftheDFIGwindturbinesystemtogriddisturbancesissimulatedand
7、ver-ifiedexperimentally.Avoltagesagto80%(80%remainingvoltage)ishandledverywell.Moreover,asecond-ordermodelforpredictionoftheresponseofsmallvoltagesagsoftheDFIGwindturbinesisderived,anditssimulatedperformanceissuccessfullyverifiedexper-imentally.Theenergyprod
8、uctionoftheDFIGwindturbineisinvestigatedandcomparedtothatofotherwindturbinesystems.TheresultfoundisthattheenergycaptureoftheDFIGwindtur-bineisalmostthesameasforanactivestall-controlledfixed-speed(usingtwofixeds
