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1、2010InternationalConferenceonPowerSystemTechnology1TransientBehaviorAnalysisofDoubly-fedInductionGeneratorunderUnbalancedVoltageDipsandTestingValidationWenchangShao,RuimingWang,QingLi,ShiyaoQinDFIGisitsvulnerabilitytogriddisturbancesespeciallytoAbstract--No
2、rmally,it’smoredifficulttorealizeLowVoltageunbalancevoltagedips.ThestatorwindingsareconnectedRidethrough(LVRT)forDoubly-fedinductiongenerator(DFIG)directlytothegridwithonlyarotor-sideAC-DC-ACunderunbalancedvoltagedipsthaninbalancedvoltagedips.partially-rate
3、dconverter.GridvoltagedipcausesoverUnbalanceddipsaremoreharmfultotheDoubly-fedinductionvoltagesandovercurrentsintherotorwindingsthatcangenerator(DFIG)thanbalanceddips,becausetheyinducehigherdamagetheconverterifnoprotectionelementsareinstalled.voltagesinther
4、otor.Besides,theinfluenceofunbalancedgridSoinordertoprotectthevulnerableconverteraswellasothervoltagedipstoDFIGisstudiedtogetherwiththetransientcomponents,windturbinesoftendisconnectedfromthegrid.behaviorofDFIG.Atheoreticalanalysisisgiventothereasonsoftheov
5、ercurrentoccurringduringanunbalancedgridvoltageHowever,asthepenetrationofwindpowercontinuestodipsinthispaper.FieldtestingresultswithmobileLVRTtestingincrease,morecountriesarerevisingtheirgridcodeswhichcontainerarealsopresentedtosupporttheanalysis.demandwind
6、turbinesremainconnectedtothegridintheeventofvoltagedips,andsupplyreactivepowerduringtheIndexTerms--DFIG,LVRT,UnbalancedVoltageDips.voltagedip.Inordertofulfillthenewrequirements,windturbinesarerequiredtohaveLowVoltageRidethroughI.NOMENCLATURE(LVRT)capability
7、.InChina,StateGridCorporationhasrecentlyissuedastandardforsuchcapabilityinTechnicalu,u—Statorandrotorvoltagespacevector.srRuleforconnectingwindfarmintopowergrid[1].Thus,itisveryessentialtounderstandtheresponsei,i—Statorandrotorcurrentspacevector.srbehavioro
8、fDFIGundergridvoltagedips,andlaterontoψ,ψ—Statorandrotorfluxspacevector.verifytheDFIGstructuralanditscontrol.srNormally,it’smoredifficulttorealizeLVRTunderRs,Rr—Statorandrotorresistance.unbalancedvolta
