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基于SHEPWM技术的多电平电流型变流器.docx

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基于SHEPWM技术的多电平电流型变流器 Abstract Voltagesourceinverters(VSI)havebeenwidelyusedinpowerelectronicsystems.However,VSIhassomelimitations,particularlyintermsoflow-voltageandhigh-currentapplications.Inrecentyears,multi-levelinverterswithpulsewidthmodulation(PWM)controlhavebeenusedtoovercometheselimitations.Sinusoidalpulsewidthmodulation(SPWM)hasbeencommonlyusedinmulti-levelinverters,butithassomedrawbacks,suchaslowharmonicquality.Incontrast,selectiveharmoniceliminationpulsewidthmodulation(SHEPWM)caneliminatespecificharmonicsintheoutputvoltagewaveform,andithasbetterharmonicqualitythanSPWM.ThispaperpresentsastudyonSHEPWM-basedmulti-levelcurrentsourceinverter(CSI)forhigh-stressapplications.Theproposedtopologycaneliminatethethirdandfifthharmonicsintheoutputcurrentandreducethetotalharmonicdistortion(THD).Theperformanceoftheproposedtopologyhasbeenevaluatedthroughsimulationandexperimentaltests.TheresultsshowthattheproposedCSIwithSHEPWMcontrolcanachievebetteroutputcurrentwaveformqualityandreduceTHDsignificantlycomparedtothetraditionalCSIwithSPWMcontrol. Keywords:multi-levelinverter,pulsewidthmodulation,selectiveharmonicelimination,currentsourceinverter,totalharmonicdistortion Introduction Voltagesourceinverters(VSI)havebeenwidelyusedinpowerelectronicsystems,suchasadjustablespeeddrivesystems,renewableenergysystems,anduninterruptiblepowersupplies(UPS).However,VSIhassomelimitations,particularlyintermsoflow-voltageandhigh-currentapplications.Forhigh-voltageandlow-currentapplications,thesizeofthepowersemiconductordevicescanbereduced,whichreducesthecostandimprovestheefficiencyofthesystem.However,forlow-voltageandhigh-currentapplications,thepowersemiconductordeviceshavetohandlehighcurrentlevels,whichincreasestheconductionandswitchinglossesandreducestheefficiencyofthesystem.Therefore,VSIhassomelimitationsinlow-voltageandhigh-currentapplications. Inrecentyears,multi-levelinvertershavebeenusedtoovercometheselimitations.Multi-levelinvertersincreasethenumberofoutputvoltagelevelsbyaddingmorevolta