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1、IEEETRANSACTIONSONENERGYCONVERSION,VOL.22,NO.1,MARCH2007129ControlofaDoublyFedInductionWindGeneratorUnderUnbalancedGridVoltageConditionsTedK.A.Brekken,Member,IEEE,andNedMohan,Fellow,IEEEAbstract—Windenergyisofteninstalledinrural,remotear-eascharacterizedbyweak,unbalancedpowertransmissiongr
2、ids.Ininductionwindgenerators,unbalancedthree-phasestatorvolt-agescauseanumberofproblems,suchasovercurrent,unbalancedcurrents,reactivepowerpulsations,andstressonthemechanicalcomponentsfromtorquepulsations.Therefore,beyondacertainamountofunbalance,inductionwindgeneratorsareswitchedoutofthen
3、etwork.Thiscanfurtherweakenthegrid.Indoublyfedinductiongenerators(DFIGs),controloftherotorcurrentsallowsforadjustablespeedoperationandreactivepowercontrol.ThispaperpresentsaDFIGcontrolstrategythatenhancesthestan-dardspeedandreactivepowercontrolwithcontrollersthatcancompensatefortheproblems
4、causedbyanunbalancedgridbybalancingthestatorcurrentsandeliminatingtorqueandreactiveFig.1.Doublyfedinductionmachine.powerpulsations.IndexTerms—ACgenerators,inductionmotors,powersystemdynamicstability,reactivepowercontrol,torquecontrol,variableAllvariablesareperunitorSIunits.Statorquantities
5、arespeeddrives,windenergy.referencedtothestator.RotorquantitiesarereferencedtotheNOMENCLATURErotor.vsd,vsqStatordandqwindingvoltage.I.INTRODUCTIONisd,isqStatordandqwindingcurrent.vrd,vrqRotordandqwindingvoltage.INDenergygenerationequipmentismostoftenin-ird,irqRotordandqwindingcurrent.Wstal
6、ledinremote,ruralareas.Theseremoteareasλsd,λsqStatordandqwinding?uxlinkage.usuallyhaveweakgrids,oftenwithvoltageunbalancesandλrd,λrqRotordandqwinding?uxlinkage.under/overvoltageconditions[1],[2].WhenthestatorphaseTGeneratortorque.voltagessuppliedbythegridareunbalanced,thetorquepro-QsStator
7、reactivepower.ducedbytheinductiongeneratorisnotconstant.Instead,theLmGeneratormagnetizinginductance.torquehasperiodicpulsationsattwicethegridfrequency,whichLs,LrStatorandrotorperphasewindinginductance.canresultinacousticnoiseatlowlevelsandathighlevelscanLls,Ll
