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1、IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.60,NO.9,SEPTEMBER20133627ANine-LevelInverterTopologyforMedium-VoltageInductionMotorDriveWithOpen-EndStatorWindingP.P.Rajeevan,K.Sivakumar,K.Gopakumar,Fellow,IEEE,ChintanPatel,andHaithamAbu-Rub,SeniorMember,IEEEAbstractAnewschemefornine-levelvoltagesp
2、ace-vectorpulsewidth-modulatedstaircasewaveformgeneratedbyamul-generationformedium-voltageinductionmotor(IM)driveswithtilevelinverterisanapproximationofasinusoidalwaveform,open-endstatorwindingispresentedinthispaper.Thepro-andhence,expensiveandbulkyfilterscanbeavoided,inposednine-levelpowerconv
3、ertertopologyconsistsoftwocon-manyapplications.Also,inmanyhigh-voltageapplications,theventionalthree-phasetwo-levelvoltagesourceinverterspoweredbyisolateddcsourcesandsixfloating-capacitor-connectedtransformerforsteppingupthevoltagecanbeeliminated,asH-bridges.TheH-bridgecapacitorvoltagesareeffec
4、tivelymain-themultilevelinverterscangeneratehigh-voltagewaveformstainedattherequiredasymmetricallevelsbyemployingaspaceusingswitchingdevicesoflow-voltageratings.However,atvectormodulation(SVPWM)basedcontrolstrategy.Aninterest-highernumberofvoltagelevels,thecostandthecomplexityofingfeatureofthi
5、stopologyisitsabilitytofunctioninfive-ormultilevelinvertercircuitincrease,anditsreliabilitydecreasesthree-levelmode,intheentiremodulationrange,atfull-powerrating,intheeventofanyfailureintheH-bridges.Thisfeatureduetothepresenceofalargenumberofcomponentsandthesignificantlyimprovesthereliabilityoft
6、heproposeddrivesystem.associatedcontrolcircuits.Hence,oneofthemainareasofEachlegofthethree-phasetwo-levelinvertersusedinthistopol-researchinthisfieldisthedevelopmentofmultilevelinverterogyswitchesonlyforahalfcycleofthereferencevoltagewave-topologieswithlessernumberofcomponents,higherreliability
7、,form.Hence,theeffectiveswitchingfrequencyisreducedbyhalf,andhigherefficiency.resultinginswitchinglossreductioninhigh-voltagedevices.Thetransientaswellasthesteady-stateperformanceoftheproposedAnumberofmultilevelconvertertopologieshavebee
