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ID:33908860
大小:3.46 MB
页数:73页
时间:2019-03-01
《基于混合开关器件的电流型多电平pwm整流器分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、华北电力大学硕士学位论文AbstractRectifierisanimportantpartwhichconnectsthepowerelectronicdevicestothegrid.Multi-levelcurrentsourcePWMrectifierhastheadvantagesofflexiblecurrentcontrol,largepowercapacity,lowinputcurrenttotalharmonicdistortion,fasttransientresponseandsoon.Ithasbeenwidel
2、yusedinthefieldoftheelectricvehiclecharging,windfarmsconverterstations,industrialheattreatmentandotherhigh-powerapplications.Takethesecharacteristicsintoaccount,amulti-levelcurrentsourcePWMrectifierusinghybridswitchingdevicesismainlydiscussedandanalyzedinthispaper.1.Mainc
3、ircuittopologyandmathematicalmodelarestudied,andanaveragemodelforhybridswitchingthree-levelcurrentsourcePWMrectifiertopologyispresented.Dynamicmodelsofpowerconvertersarenormallytime-varying.Traditionalapproachesareappliedtoanalyzethepowerconverterstoachievethetime-invaria
4、ntmodelssuitableforsystemanalysisanddesignviatheclassicalcontroltheory.Thepresentedpowersystemconsistsofathree-phasecontrolledrectifierandanIGBT-controlledbuckconverterbyusingthedqandthegeneralizedstate-spaceaveragingmethods.ThenewtypeofPWMbuckrectifierdynamicmodelisdescr
5、ibedindetail,theproposedmodelcanprovidegoodperformanceinbothtransientandsteady-stateresponses.Theoperationalprincipleisanalyzedatthesametime,andthecommutationmechanismofhybridswitchingrectifierisdescribedindetail.2.Spacevectorpulsewidthmodulation(SVPWM)methodforthree-phas
6、ehybridswitchingrectifierisdiscussed,animprovedSVPWMcontrolstrategyisputforward.Agivenapproachwhichtheq-axiscurrentisassignedtononzeroistoregulatethepowerfactor.Theexcellentperformanceofthepresentedrectifierisverifiedbysimulationandexperimentalwaveforms,alowcurrenttotalha
7、rmonicdistortion(THD)andinputsinusoidalcurrentareeffectivelyachieved.3.Largecurrentandhighpowercanbeobtainedbyparallellingcurrentsourcerectifiersdirectly.Aninterleavingparallelsystemconsistsofsomethree-phasebuck-typerectifiersisdescribedinthispaper,andsampletimestaggeredS
8、VPWMcontrolisadoptedtoensuresmallACsideharmonicatlowswitchingfrequency,sectorsignalselectioncurr
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