中高壓功率變換相關技術的基礎研究.pdf

1、浙江大學博士學位論文中高壓功率變換相關技術的基礎研究姓名：費萬民申請學位級別：博士專業(yè)：電力電子與電氣傳動指導教師：呂征宇吳兆麟20040401浙江大學博士學位論文AbstractMultilevelconvertershavebeenbecomingincreasinglypopularinrecentyearsinmediumhighvoltageacdrivesystemsandFACTSequipments，mainlyduet

2、otheirhighvoltage—capabifity’hi曲outputqualitylowswitchinglossesandlowEMCconcI：TnsThekeytechnologiesofmultilevelconverterssuchastopologycontrolstrategyandthedesignofisolateddrivingpowersuppliesofthesemiconductordevicesinc

3、ludedareresearchedinthisdissertationAcompositecascademultilevelconvertercomposedofamainconverterandanaccessorialoneispresentedwhichiswellsuitedforapplicationinhighvoltagesituationswithllighperformancerequirementsAhybridd

4、iodeclampedmultilevelconvertertopologyisobtainedbyextendingthetopologyofafive—levelhybriddiMeclampedconverterandthenewconverterhasfewerclampingdiodescomparedtotheclassiconewiththesamenumberofOUtpUtvoltagelevelsAnewkindof

5、multilevelconvertercomposedofaHbridgeandseveralbidirectionalswitchesispresentedwhichhasaseriesofadvantageswhenusedinlowvoltagesituationswithllighperformancerequirementsGeneralizedSHEPWMtechniqueapplicabletomultilevelvolt

6、ageinverterisstudiedinthisdissertationAmethodforestablishingnonlinearequationsdirectlyandsimplyaccordingtothequartersymmetricwaveformforMultilevelSelectedHarmonicEliminationisproposedConvergenceofthenonlinearequationsisi

7、mprovedbyanewmethodofobtaininginitialvaluesusingMulti—carrierPWMmethodSimulationsofSHEPⅣMtechniqueapplicabletomultilevelvoltageinverterusingPOWERSIM40arecarriedoutExperimentresultofadiodeclampedthreelevelvoltagetypeinver

8、tercomposedofMOSFETscontrolledbyatwo—DSP(TMS320I屁407A)controlflatformisobtainedSimulationandexperimentresultsprovedtheadvantagesoftheSHEPWMbasedmethodAnewkindofpowersupplywitllmultipleisolatedoutputsusedforgatingsemicond

9、uctordevicesisdevelopedThemainpartsofthepowersupplyincludeaDCcurrentsource，abridge—typeinverter，aseriesofoutputtransformersandshuntvoltageregulatorsAsingletumprimarywindingisusedinoutputwansformersTheisolationvoltageamon

10、galloutputsandinputcallbeconsiderablellighiftheprimarywindingismadebyhighvoltagecableThenumberandlocationsofthetransformerscanbearrangedquiteeasilytomeettherequirementsofthemainsystemComparedwithotherpowersupplyusedinthe

11、samepurpose，theproposalonehastheadvantageinsize，weightcostefficiencyandreliabilityWiththeincreaseofvoltagelevelandnumberofdevicesinthemultilevelconvgI“WT，theproposedpowersupplywillbemoreadvantageousKeywords：MultilevelCon