三相三电平pwm整流器控制策略-研究

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1、万方数据ABSTRACTWiththedevelopmentofthepowersemiconductorswitchingdevices，allkindsofconverterdeviceshaveaverywideapplicationinbusiness．Asahnostallvariableconverterdevicesneedrectification，dioderectifierbecomesthemainmethodofimplementation．Becausethediode

2、isuncontrollabledevice，it’Sunabletoachievethesinusoidalwavecontrolofrectifier’Sunity-power—factor．Therefore，uncontrolledrectifierwillproducelargeamountsofharmonicandreactivepower,whichispowergridharmonicpollution．However,PWMrectifieradoptscontrolledd

3、evices，itcanrununderunity—power—factor,guaranteethatthecurrentwaveformissine，andreducethegenerationofharmonicandreactivepowerandthepollutiontopowernetwork．MeanwhilePWMrectifiercanrealizefourquadrantoperationandthefeedbackofenergy,SOitcanincreasetheef

4、ficiencyofelectricity．Comparedwiththetwo．1evelPWMrectifier,three—levelPWMrectifierhasabeUerperformance；becauseoftheincreaseofvoltagelevelnumbers．thethree—levelPⅥqvlrectifieraccurrentsaremuchclosertothesine，havelowertotalharmonicdistortion，andmakethev

5、oltageoneachdevicebereducedbyhalf．Therefore，three．1evelPWMrectifiercanbeappliedwidelyinthefieldofhighvoltagepower,andhasgreatapplicationvalueandprospect．Thestudyofthree。levelPWMrectifierhasimportantpracticalsignificance．Thispapermakesadeepresearchond

6、iodeclamptypethree—-phasethree。·levelPWMrectifier．TakingphaseAasanexample，theworkingprocessesoftherectifierinthreekindsofcircumstancesareanalyzedindetail，andthevoltageconditionsonswitchingtubesandclampdiodeineveryworksituationaresummarized．Inthreekin

7、dsofcoordinatesystem，throughtheintroductionofgeneralvectorandequi—valenttransformationprinciple，thecoordinatetransformationformulaiSdeduced．ThemathelnaticalmodeloftherectifieriSestablishedundertherotatingcoordinatesystem；fromitsanalysis，activecurrent

8、andreactivecurrentaremutualcoupling．Currentfeedforwarddecouplingcontrolmethodisusedtorealizedecouplingcontrolofcurrentandsystemcontroldiagramoftherectifierispresented．Thespacevoltagevectormodulationmethodintwodifferentcoordinatesisstudiedinthispaper,