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1、ANovelImpedanceMeasurementTechniqueforPowerElectronicSystemsPengXiao,StudentMember,IEEE,GaneshVenayagamoorthy,SeniorMember,IEEE,andKeithCorzine,SeniorMember,IEEEReal-TimePowerandIntelligentSystemsLaboratoryElectricalandComputerEngineeringDepartmentUniversit
2、yofMissouri-Rolla,Rolla,MO65401,USAAbstract-Whendesigningandbuildingpowersystemsthatmachinesandthree-phasechoppercircuit[5-6].Animpedancecontainpowerelectronicswitchingsourcesandloads,systemmeasurementtechniqueutilizingaline-to-linecurrentintegratorsmustcon
3、siderthefrequency-dependentimpedanceinjectionchoppercircuitwasrecentlyproposed[7],whichhascharacteristicsataninterfacetoensuresystemstability.Stabilitycriteriahavebeendevelopedintermsofsourceandloadasimplestructureandismucheasiertoimplementcomparedimpedance
4、forbothdcandacsystemsanditisoftennecessarytowithothermethods.measuresystemimpedancethroughexperiments.TraditionalAcommonproblemoftheseimpedancemeasurementinjection-basedimpedancemeasurementtechniquesrequiretechniquesisthattheyrequireinjectionofperturbations
5、ignalsmultipleonlinetestswhichleadtomanydisadvantages.Thetothesystemonefrequencyatatime.Toobtaintheimpedanceidentificationmethodproposedinthispapergreatlyreducesonlinetesttimebymodelingthesystemwithrecurrentimpedancecharacteristicsoverawidefrequencyrangefor
6、neuralnetworks.Therecurrentnetworksaretrainedwithstabilityanalysis,multipletestsmustberepeatedlyperformed.measuredsignalsfromthesystemwithonlyoneinjection.TheDuringeachtest,aperturbationsignalofaspecificfrequencymeasurementandidentificationprocessesfordcand
7、three-phaseisinjectedintothesystem,andthevoltagesandcurrentsareacinterfacesaredeveloped.Simulationtestsdemonstratethemeasuredandrecorded.Whentestsforallfrequenciesareeffectivenessofthisnewtechnique.finished,therecordeddataisprocessedtocalculatetheI.INTRODUC
8、TIONimpedancevalueateachfrequency.Themaindisadvantagesofthisprocedureinclude:(i)IttakesalongonlinetimetoStabilityanalysisinpowerelectronicsbaseddistributedcompletetheinjectionsforallfrequencies;(ii)The
