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1、DesignofaBack-to-backMultilevelInductionMotorDriveforTractionSystemsAntonioDell’Aquila,MarcoLiserre,VitoG.MonopoliCarloCecatiPolitecnicodiBanUniversitbdell’AquilaViaE.Orabona4MontelucodiRoio70125BariItaly67040L’AquilaItalyemail:(dellaqui,liserre,monopoli)@poliba.ite-mail:c.
2、cecati@ieee.orgAbstruct-ThispaperdealswiththedesignofasingleRecently,H-bridge-basedmultilevelconvertershavebeenphasea.c./d.c./a.c.converterfeedinganinductionmotorforconsideredsuitedfortractionapplicationsfedbyfuel-cellstractionapplications.AcascadeofH-bridgecellshasbeenorot
3、herdcsources[5]-[6].However,onlyfewpapersdealusedtoobtainamultilevelconversionstructure.Thefront-endwiththeiruseinback-to-backapplications.rectifiershouldabsorbcurrentwithlowharmoniccontenttoDifferentlyfromtheothers[3],thesysteminvestigatedineliminatedisturbancesonthecommun
4、icationequipmentsand,moreingeneral,toreduceelectromagneticpollution.thispaperdoesnotincludeanyintermediated.c.1d.c.Additionalspecificationistheeliminationofthetransformerconverters,beingtherectifierinchargeofthedc-bussessuchastoreduceencumbranceandcost.AsimilarH-bridgeregul
5、ationandbalance,andthemultilevelinverterinchargecascadehasbeenusedinthemotorside.Infact,supplyingtheofthemotorcontrol.motorbymultilevelvoltagesgreatlyreducethecurrentInthispaper,afteramathematicaldescriptionoftheharmonicdistortion,enhancinginductionmotorperformance,systemun
6、derinvestigation,somecontrolissuesrelatedtoandtheswitchingfrequency,improvingefficiencyandtheconsideredconversionstructurehavebeenaddressedextendingcomponentlife.Inthispaper,thedesignofthewiththeoreticalanalysis,simulationsandsomeearlyconverterhasbeendescribedwiththehelpoft
7、heoreticalexperimentsonalaboratoryprototype.analysisandsimulations,moreoversomefirstpartialexperimentalresultsarealsoshown.11.MATHEMATICALMODELTheconsideredconverter,showninFig.1,consistsofI.INTRODUCTIONthreedistinctandidenticalsections,eachoneschematicallyconstitutedasshow
8、ninFig.2.EachH-bridgecircuitTheuseofmultilevelconvertersarebecomingmoreandincludes
