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1、Small-SignalModelofaVoltageSourceInverter(VSI)ConsideringtheDead-TimeEffectandSpaceVectorModulationTypes1111122S.Ahmed,Z.Shen,P.Mattavelli,D.Boroyevich,M.Jaksic,K.KarimiandJ.Fu12CenterforPowerElectronicSystemsTheBoeingCompany(CPES)Seattle,WATheBradleyDepartmentofEl
2、ectricalkamiar.j.karimi@boeing.comandComputerEngineeringVirginiaPolytechnicInstituteandStateUniversityBlacksburg,VAsahassan@vt.eduAbstract—Thispaperpresentsamodifiedsmall-signalmodelofforcontrolandstabilitystudies.avoltagesourceinverter(VSI)thatcapturesmodelStabili
3、tyanalysisisimportantbecausemostpowernonlinearitiessuchasdeadtimeandmodulationeffectsthatelectronicsconvertersbehaveasconstantpowerloadsthatwerenotpresentedintheliterature.Previousresearchhashavenegativeimpedancecharacteristicsandcancauseconcentratedondevelopingcom
4、pensationmethodsfortheseinstabilities[4]-[6].Foracconverters,akeybreakthroughwastypesofphenomenainaswitchingmodel,butnoneactuallyaccomplishedbyBelkhayatwhoemployedthegeneralizedderivedananalyticalmodelthatcanpredictthem.Inthispaper,Nyquiststabilitycriterion(GNC)toa
5、ssessthestabilityofacthesmall-signalmodeloftheVSIinliteratureisused,andtheinterfacesinthed-qframe[6]-[7].Thisworkwasusedinthisdifferentphenomenaarethenincorporatedintothemodeltogetresearchalongwithanimpedancemeasurementtoolacompleteone.Inaddition,theoutputimpedance
6、oftheVSIisderivedwiththemodifiedsmall-signalmodel,comparedtothedevelopedin[8]forstabilityassessmentoftheVSI.Theconventionaloneandvalidatedwithswitchingmodelandimpedanceswerealsoderivedanalyticallyusingtheexperimentalresults.conventionalsmall-signalmodelknowninliter
7、atureshowinganewmissingdampingfactorinVSIinthed-qaxis.ThisI.INTRODUCTIONdampingfactorwaspredictedtobeduetothenonlinearitiesofthemodellikethevarioustypesofmodulation[9-10],theVoltagesourceinverters(VSIs)areextensivelyusedindeadtimethatisinevitabletopreventtheshoot-t
8、hroughpowerelectronicssystems,especiallymotordrivephenomenon[11-13],andtheinherentcharacteristicsoftheapplications.Inordertopredictthecorrectperf
