Investigation and Comparison of Multi-Level converters for medium voltage applications

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1、TechnischeUniversitätBerlinInvestigationandComparisonofMulti-LevelConvertersforMediumVoltageApplicationsSeyedSaeedFazelvonderFakultätIV-ElektrotechnikundInformatikderTechnischenUniversitätBerlinInstitutfürEnergie-undAutomatisierungstechnikZurErlangung

2、desakademischenGradeseinesDoktoringenieurs(Dr.-Ing.)genehmigteDissertationVorsitzender:Prof.Dr.-Ing.C.BoitGutachter:Prof.Dr.-Ing.S.BernetProf.Dr.-Ing.U.SchäferProf.Dr.-Ing.M.MichelTagderEinreichung:11.07.2007TagderVerteidigung:23.08.2007Berlin2007D83S

3、eyedSaeedFazelInvestigationandComparisonofMulti-LevelConvertersforMediumVoltageApplicationsPrefaceIwouldliketoexpressmysinceregratitudetomysupervisor,ProfessorDr.-Ing.SteffenBernetforhisprofessionalguidance,interestingdiscussionandencouragementthrough

4、outtheperiodofthisresearch.IwouldalsoliketothankmyfriendsandcolleaguesinthePowerElectronicsGroupofBerlinUniversity.Inparticular,IwouldliketoacknowledgeDietmarKrugandKamranJalili.TheauthorwishestoacknowledgethefinancialsupportofIranMinistryofScience,Re

5、searchandTechnologyscholarship.Finally,mypersonalthanksareextendedtomyfamilyandfriendsfortheirsupport.SeyedSaeedFazelBerlin,July2007-i-TABLEOFCONTENTSGlossaryofSymbolsandAcronyms.......................................................................iv

6、ListofFigures..........................................................................................................xListofTables............................................................................................................xvii1.Intro

7、duction.........................................................................................................12.OverviewofMediumVoltageConverterTopologies.......................................32.1.StateoftheArtinMediumVoltageConverters............

8、.................................32.2.StateoftheArtinMediumVoltagePowerSemiconductors...........................63.BasicStructureandFunctionofMulti-LevelVoltageSourceConverterTopologies…………………………………………...………………………..93.1.Two-LevelVoltageSourceC