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基于FFT的三电平逆变器的死区补偿策略
基于FFT的三电平逆变器的死区补偿策略
Abstract
Three-levelinvertershavebecomeanimportantcomponentinpowerelectronics,particularlyinapplicationssuchasmotorcontrolandphotovoltaicsystems.Deadzoneisanimportantissueintheoperationofthree-levelinverters.Inthispaper,weproposeaFourier-baseddeadzonecompensationstrategyforthree-levelinverters.Theproposedstrategymitigatestheeffectofdeadzoneontheoutputcharacteristicsoftheinverterbyanalyzingthehigherfrequencycomponentsoftheoutputvoltagewaveforms.TheeffectivenessofthisstrategyisdemonstratedthroughsimulationresultsobtainedusingMATLAB/Simulink.
Keywords:Three-levelinverter,deadzone,Fouriertransform,compensationstrategy.
Introduction
Three-levelinvertershavebecomeincreasinglypopularinrecentyearsduetotheirabilitytoprovideahigherqualityoutputwaveformcomparedtotraditionaltwo-levelinverters.Thisisespeciallythecaseinapplicationsrequiringhighprecisionandlowdistortion,suchasmotorcontrolandphotovoltaicsystems.
However,theoperationofthree-levelinvertersisnotwithoutitschallenges.Onesuchchallengeisthepresenceofdeadzoneintheinputsignals.Thisisaresultofthenon-idealcharacteristicsofthepowerswitchesusedintheinverter,whichcanresultinacertainrangeofinputsignalsbeingignored.
Deadzonecanhaveasignificantimpactontheoutputcharacteristicsoftheinverter,resultinginincreaseddistortionandreducedefficiency.Asaresult,anumberofmethodshavebeenproposedintheliteraturetocompensateforthiseffect,includingpulse-widthmodulation(PWM)techniques,hysteresis-basedmethodsandlook-uptable(LUT)approaches.
Inthispaper,weproposeaFourier-baseddeadzonecompensationstrategyforthree-levelinverters.ThisstrategyisbasedonanalyzingthehigherfrequencycomponentsoftheoutputvoltagewaveformsusingtheFouriertransform.Byremovingthesehigherfrequencycomponents,theimpactofdeadzoneontheoutputwaveformcanbeeffectivelymitigated.
Fourier-basedDeadZoneCompensationStrategy
Theproposeddeadzonecompensationstrategyforthree-levelinvertersisbasedontheFouriertransform.Thekeyideaistoanalyzethehigherfrequencycompone