1、鄭州大學碩士學位論文直流電源級聯(lián)式多電平逆變器的控制策略與實現(xiàn)姓名：王志東申請學位級別：碩士專業(yè)：電路與系統(tǒng)指導教師：劉平201206ABSTRACTABSTRACTModeminvertertechnologyhasbecomeanindispensabletechnologyintheprocessofpeopletoproducelife，hismainroleistothemainselectricitygridhasbeenp

2、ollutedACpower，orbatteries，fuelcells，solarcellsunstableelectricitytransformintohighquality，harmonicpollutiontomeettheuserrequirementsforvoltageandfrequencyThistechniqueismainlyusedinACmotorfrequencycontrol，uninterruptibl

3、epowersupplies，activefilters，reactivepowercompensationofthemains，whereDCneedtobeabletotransformtheplaceoftheACpowerAccompaniedbysocialdevelopmentindustrialtechnologycontinuestoimprove，moreandmoreelectricalequipmentconnec

4、tedtothegrid，thesedevices，mostofwillcausingseriousharmonicpollutiononthegrid，makingtheoriginalelectricitypowerlinecallnotmeetthepeopleThehigh—qualityACpowerdemandThiselectricalenergymustbeprocessedinorderforthenormaluseS

5、omodeminvertertechnologywillplayanimportantroleintheprocessTherearetwomaindirectionsinverterreducestheoutputvoltageharmonic，firstistwolevelinverter，usedsoft—switchingtechnology，highfrequencyteducetheharmonicpollutionTheo

6、theristhemulti—levelinvertertechnologyThefirstmethodistoincreasetheswitchingfrequencytoreducetheharmoniccontentofoutputThisapproachistoimprovetheswitchingdevicecostsattheexpenseoftheEMIlargeswitchingloss，callonlyimprovet

7、hewritewavefrequencycallnoteliminateharmonics，buttheregulatorconvenientAnotherisbyincreasingthenumberofoutputlevelteducetheoutputharmoniccontentThismethodisbasedonincreasingthenumberofswitchingdevicestoexpensetheEMIsmall