Definition-of-a-5-MW-reference-wind-turbine-for-of

TechnicalReportNREL/TP-500-38060February2009Definitionofa5-MWReferenceWindTurbineforOffshoreSystemDevelopmentJ.Jonkman,S.Butterfield,W.Musial,andG.ScottNationalRenewableEnergyLaboratory1617ColeBoulevard,Golden,Colorado80401-3393303-275-3000•://:U.S.DepartmentofEnergyOfficeofScientificandTechnicalInformationP.O.Box62OakRidge,TN37831-0062phone:[phone]fax:[phone]email:mailto:[e-mail]public,inpaper,from:U.S.DepartmentofCommerceNationalTechnicalInformationService5285PortRoyalRoadSpringfield,VA22161phone:[phone]fax:[phone]email:[e-mail]:®=AutomaticDynamicAnalysisofMechanicalSystemsA2AD=ADAMS-to-AeroDynBEM=blade-element/momentumCM=centerofmassDLL=dynamiclinklibraryDOE=U.S.DepartmentofEnergyDOF=degreeoffreedomDOWEC=DutchOffshoreWindEnergyConverterprojectDU=DelftUniversityECN=EnergyResearchCenteroftheNetherlandsequiripple=equalized-rippleFAST=Fatigue,Aerodynamics,Structures,andTurbulenceGE=GeneralElectricIEA=InternationalEnergyAgencyMSL=meansealevelNACA=NationalAdvisoryCommitteeforAeronauticsNREL=NationalRenewableEnergyLaboratoryNWTC=NationalWindTechnologyCenterOCS=offshorecontinentalshelfOC3=OffshoreCodeComparisonCollaborativePI=proportional-integralPID=proportional-integral-derivativeRECOFF=RecommendationsforDesignofOffshoreWindTurbinesprojectWindPACT=WindPartnershipsforAdvancedComponentTechnologyprojectw.r.t.=withrespecttoivNomenclatureAd=discrete-timestatematrixBd=discrete-timeinputmatrixCd=discrete-timeoutputstatematrixCφ=effectivedampingintheequationofmotionfortherotor-speederrorDd=discrete-timeinputtransmissionmatrixfc=cornerfrequencyGK=gain-correctionfactorIDrivetrain=drivetraininertiacasttothelow-speedshaftIGen=generatorinertiarelativetothehigh-speedshaftIRotor=rotorinertiaKD=blade-pitchcontrollerderivativegainKI=blade-pitchcontrollerintegralgainKP=blade-pitchcontrollerproportionalgainKφ=effectivestiffnessintheequationofmotionfortherotor-speederrorMφ=effectiveinertia(mass)intheequationofmotionfortherotor-speederrorn=discrete-time-stepcounterNGear=high-speedtolow-speedgearboxratioP=mechanicalpowerP0=ratedmechanicalpowerPθ∂∂=sensitivityoftheaerodynamicpowertotherotor-collectiveblade-pitchanglet=simulationtimeTAero=aerodynamictorqueinthelow-speedshaftTGen=generatortorqueinthehigh-speedshaftvTs=discrete-timestepu=unfilteredgeneratorspeedx=forthecontrol-measurementfilter,thefilterstatex,y,z=setoforthogonalaxesmakingupareference-framecoordinatesystemy=forthecontrol-measurementfilter,thefilteredgeneratorspeedα=low-passfiltercoefficientΔθ=smallperturbationoftheblade-pitchanglesabouttheiroperatingpointΔΩ=smallperturbationofthelow-speedshaftrotationalspeedabouttheratedspeed∆Ω=low-speedshaftrotationalaccelerationζφ=dampingratiooftheresponseassociatedwiththeequationofmotionfortherotor-speederrorθ=full-spanrotor-collectiveblade-pitchangleθK=rotor-collectiveblade-pitchangleatwhichthepitchsensitivityhasdoubledfromitsvalueattheratedoperatingpointπ=theratioofacircle’scircumferencetoitsdiameterφ=theintegralofϕwithrespecttotimeϕ=smallperturbationofthelow-speedshaftrotationalspeedabouttheratedspeedϕ=low-speedshaftrotationalaccelerationΩ=low-speedshaftrotationalspeedΩ0=ratedlow-speedshaftrotationalspeedωφn=naturalfrequencyoftheresponseassociatedwiththeequationofmotionfortherotor-speederrorviExecutiveSummaryTosupportconceptstudiesaimedatassessingoffshorewindtechnology,wedevelopedthespecificationsofarepresentativeutility-scalemultimegawattturbinenowknownasthe“NRELoffshore5-MWbaselinewindturbine.”Thiswindturbineisaconventionalthree-bladedupwindvariable-speedvariableblade-pitch-to-feather-cont