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河南理工大学外文文献翻译本科毕业设计外文文献及译文文献题目：DirectTorqueControlofInductionMotorsUtilizingThree-LevelVoltageSourceInverters文献作者：XavierdelToroGarcia,AntoniArias,MarcelG.JayneandPhilA.Witting文献来源：IEEETrans.Ind.Electron,vol.51，No.4，pp.744–757发表日期：2004年8月班级：姓名：学号：指导教师：翻译日期：河南理工大学外文文献翻译英文原文：DirectTorqueControlofInductionMotorsUtilizingThree-LevelVoltageSourceInvertersXavierdelToroGarcia,AntoniArias,MarcelG.Jayne,andPhilA.WittingAbstract—Anewcontrolstrategyforinductionmotorsbasedondirecttorquecontrolispresentedwhichemploysathree-levelinverterinsteadofthestandardtwo-levelinverter.Thecontrollerisdesignedtoachieveatorqueripplereductionbytakingadvantageoftheincreaseinthenumberofinverterstatesavailableinathree-levelinverter.Theharmonicdistortioninthestatorcurrentsandtheswitchingfrequencyofthesemi-conductordevicesarealsoreducedinthenewcontrolsystempresented.IndexTerms—Inductionmotordrives,three-levelconverter,torquecontrol.I.INTRODUCTIONThestandardvoltagesourceinverter(VSI)traditionallyusedinelectricaldrivesystemsisthetwo-levelVSI,whichunfortunatelyhasanumberofinherentlimitations.Forexample,themaximumvoltagethatcanbesupportedbythesemiconductorswitchingdevicesintheVSIlimitsthemaximumvalueofdc-linkvoltage.Furthermore,theoutputvoltagesandcurrentsfromtheVSIcancontainhighharmonicdistortion.河南理工大学外文文献翻译TheoutputvoltagewaveformscanalsocontainlargevaluesofdV/dt,whichcontributetothedegradationofthemachinewindingsinsulationandbearings,andalsoproduceconsiderableelectromag-neticinterferenceduringoperation.NewmultilevelVSItopologies,however,canconsiderablyreducemanyoftheselimitations[1].Themostcommonlyusedmultileveltopologyisthethree-levelneutralpointclamped(NPC)VSI[2].ThistypeofVSIhasadvantagesoverthestandardtwo-levelVSI,suchasagreaternumberoflevelsintheoutputvoltagewaveforms,lessharmonicdistortion,andlowerswitchingfrequencies.Directtorquecontrol(DTC)hasemergedtobecomeapossiblealternativetothewell-knownvectorcontrolstrategiesforinductionmotorcontrolsystems[3],[4].Althoughconsiderableresearchhasbeenmadeintothetwo-leveltopologiesassociatedwiththismethodofcontrol,theamountofresearchcarriedouttodateintoDTCsystemsemployingmultileveltopologiesisstillratherlimited.Themajoradvantageofthethree-levelVSItopologywhenappliedtoDTCistheincreaseinthenumberofvoltagevectorsavailable.Thismeansthenumberofpossibilitiesinthevectorselectionprocessisgreatlyincreasedandleadstoamoreaccuratecontrolsystem,whichcanresultinareductionofthetorqueandfluxripples.Thisisofcourseachievedattheexpenseofanincreaseinthecomplexityofthevectorselectionprocess.AlthoughseveralauthorshaverecentlyproposedtheimplementationofDTCutilizingthishigher-leveltopology,theirapproachesarebasedontheuseofmorecomplexvectorselectiontablescombinedwithmodulationtechniquesbasedonanalyticalmethodswhichhavemachineparameterdependency[5][6].Adifferentapproachisaselectiontablebasedontheconceptofvirtualvectors[7].Thesenewmethodsconsiderablyincrease河南理工大学外文文献翻译thecomplexityofthecontrolstrategywhencomparedtotheclassicalDTCsystem[3],andtheycannotbeextendedtodifferentmultileveltopologieswithahighernumberoflevelsbecauseofthetableselectionmethodadopted.Fig.1.Schematicdiagramofthenewcontroller.ThispaperdescribesacontrollerbasedonDTCthatcanbeappliedtodifferentmultilevelVSItopologies.Itavoidstheuseofhysteresiscomparatorsandlook-uptables,anditdoesnotrequiretheknowledgeofthemotormodelinthecontrolsystemexceptfortheinherentestimatorasintheclassicalDTCsystem.II.NEWCONTROLLERThegeneralstructureofthenewcontrollerisshowninFig.1.Thisnovelcontrollergeneratesareferencestatorvoltagevector(u∗s)inα–βcoordinates(usα,usβ)accordingtotheDTCbasicprinciple,ratherthan河南理工大学外文文献翻译usingtheVSIstatelook-uptableasusedinclassicalDTC.ThisapproachadoptedisclosetotheDTCwithspacevectormodulationschemewithclosed-loopfluxandtorquecontrol,andstatorfluxorientedcontrol[4].Morerecently,othersimilarmethodsbasedonthepredictivetorquecontrolconcepthaveappeared[8][9].Theinputstothecontrollerarethestatorfluxerror(eψs),thetorqueerror(eΓe)and,additionally,thestatorfluxangularspeed(ωB),whichisobtainedtoincorporatethebackelectromotiveforce(BEMF)termtoimprovethetorqueresponseatdifferentoperatingpoints.Thereferencevoltagevectorcalculatedbythecontrollercanbesynthesizedusingdifferenttechniqueswithdifferentdegreesofcomplexity,suchaschoosingthenearestvectoravailableorusingmodulationtechniques[9]–[11].ThiscontrollercanbeappliedtoanytopologybecausethetypeofVSIonlyaffectsthewaythereferencevoltagevectorhastobesynthesized.Thecontrollerisbasedontheprinciplethatthedesireddecoupledcontrolofthestatorfluxmodulusandtorqueisachievedbythecontrolleractingontherespectiveradialandtangentialcomponentsofthestatorfluxvector(ψB).Thevariationofthestatorfluxvectorisapproximatelyproportionaltothevoltagevectorappliedtothemotor.Therefore,whencalculatingthereferencevoltagevector(inx–ycoordinatesfixedtothestatorfluxvector),thetangentialcomponent(u∗sy)willdependonthetorqueerror(eΓe),whereastheradialcomponent(u∗sx)willdependonthestatorfluxerror(eψB).AscanbeseeninFig.1,twoclosed-loopproportionalcontrollersareemploye