预览加载中,请您耐心等待几秒...
1/2
2/2

在线预览结束,喜欢就下载吧,查找使用更方便

如果您无法下载资料,请参考说明:

1、部分资料下载需要金币,请确保您的账户上有足够的金币

2、已购买过的文档,再次下载不重复扣费

3、资料包下载后请先用软件解压,在使用对应软件打开

基于LCL滤波的Vienna整流器占空比前馈控制 Introduction Viennarectifierisathree-phaserectifierthatusesacombinationofactiveandpassivecomponentstorectifytheACinputvoltagetoDCvoltage.Therectifierhaslowharmonicdistortion,highefficiency,andlowswitchingloss.TheViennarectifierhasapowerfactorclosetounity,whichmakesitanexcellentchoiceforhighpowerapplications.However,theDCoutputvoltageishighlydependentontheinputvoltageandloadconditions,andhence,theoutputvoltageneedstoberegulatedforstableoperation.OneofthemethodstoregulatetheDCoutputvoltageisthepulsewidthmodulation(PWM)control.Inthispaper,wewilldiscussaPWMcontrolmethodfortheViennarectifierbasedonLCLfiltertopology. ViennaRectifierTopology TheViennarectifiercomprisesofsixpowerswitches,threeintheupperarmandthreeinthelowerarm.TheACinputvoltageisappliedtotherectifierthroughafiltertoremovethehigh-frequencycomponents.Thefilterisusuallyathree-phaseLCLfilterwithseriesinductorsandshuntcapacitors.TheLCLfilterhasahighattenuationfortheswitchingharmonicsandhighercutofffrequencythantheLfilter.TheDCoutputvoltageisregulatedbycontrollingtheswitchingpatternofthepowerswitches. LCLFilterTopology TheLCLfiltertopologyiswidelyusedintheAC-DCconverterstoattenuatetheswitchingfrequencyharmonicsandtoimprovetheinputpowerfactor.TheLCLfilterconsistsoftwoseriesinductorsandashuntcapacitor.TheLCLfilterhasalowercostandsmallersizethantheLfilterbecauseofreducedinductancevalue.TheLCLfilterhasaresonantfrequencythatneedstobedesignedforstableoperation.Theresonantfrequencycanbecalculatedfromtheinductanceandcapacitancevaluesofthefilter. PWMControlofViennaRectifierwithLCLFilter ThePWMcontroloftheViennarectifierwithLCLfilterisusedtoregulatetheDCoutputvoltage.TheDCoutputvoltageiscontrolledbyvaryingthedutycycleofthePWMsignalappliedtothepowerswitches.ThePWMsignalisgeneratedbycomparingthereferencevoltageandtheoutputvoltage.ThereferencevoltagecanbesetaccordingtothedesiredDCoutputvoltage.Theoutputvoltageismeasuredusingavoltagesensor. ThePWMcontroloftheViennarectifierwithLCLfilterisbasedonthefeed