A Comparative Efficiency Study of Silicon-based Solid State Transformers

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1、AComparativeEfficiencyStudyofSilicon-basedSolidStateTransformersHengsiQinandJonathanW.KimballDepartmentofElectricalandComputerEngineeringMissouriUniversityofScienceandTechnology141EmersonElectricCo.Hall301W.16thSt.,Rolla,MO65409,USAAbstractSolidstatetransformers(SSTs)ha

2、velowerphysicaltransformerandillustratesthelossbreakdownintheSST.profilesthantraditional60HztransformersandprovideactiveFinally,itcomparestheefficiencyofallfourtopologiesundercontrolofpowerflow.However,theyarenotasefficientasdifferentloadconditionsandidentifieskeytargetsfor

3、losstraditional60Hztransformersbecauseofthepresenceofpowerreduction.electronicconverters.Thisworkpresentsananalyticallosscal-culationmodelofanSST.Itevaluatesconductionloss,switchingII.OPERATIONPRINCIPLElossandtransformerlossinfourcandidateSSTtopologies.Lossbreakdownund

4、erbothrated-loadandlight-loadconditionsareA.SSTConfigurationscomparedforallfourconfigurations.ThefollowingbrieflyreviewsthehardwareconfigurationIndexTermsSolidStateTransformer,Efficiency,SoftSwitch-ingandoperationalprinciplesoffourSSTtopologies:1)Back-to-backVSCwith60Hztran

5、sformer(SST1):SST1isacascadeconnectionofa60HzpassivetransformerandI.INTRODUCTIONalow-voltageac-dc-acconverter.ItlackstheadvantageofaPowerelectronicconverter-basedsolidstatetransformershighfrequencytransformer;however,itdoeshavepowerflow(SSTs)havebecomeattractiveduringre

6、centyears.Thankscontrollability.SoitisdefinedasanSSTconfiguration.Itsetstohigh-frequencymodulation,thevolumeandweightofabaselineforevaluationoftheefficiencyofSSTs.SSTscanbemuchsmallerthanthoseofconventional60Hz2)Three-stageSSTwithtwo-levelrectifier(SST2):SST2transformers[1

7、].Moreimportantly,SSTsprovideactivepowerusesinput-series-output-parallelconfigurationbecauseavail-flowcontrolandportsfordistributedgeneration(DG)sourcesablesilicon-baseddevicesareunabletoblockpeakvoltageatthedistributionlevel;suchportsareessentialtothefutureonthe7.2kVsid

8、e.Eachtwo-levelrectifierconvertsone-renewableenergypowergrid[2].However,anSSTmusthavethirdoftheinputvoltagetoa4kVdcbus