基于混合开关器件的电流型多电平pwm整流器分析

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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