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1、IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.60,NO.5,MAY20131919TheNewHigh-EfficiencyHybridNeutral-Point-ClampedConverterThiagoB.Soeiro,StudentMember,IEEE,andJohannW.Kolar,Fellow,IEEEAbstractThispaperintroducesanovelthree-levelvoltage-Themaindisadvantagesoft
2、hethree-levelNPCCand/orsourceconverter(VSC)asanalternativetoknownthree-levelT-typeVSCsaretherelativelyhighcost,thenecessarypartialtopologies,includingtheconventionalneutral-point-clampedcon-dc-link-voltage-balancingcontrol,andthecommonlyunevenverter(NPCC),
3、manyT-typeVSCs,andactiveNPCC.Itisshownlossdistributionacrossthebridge-legsemiconductors.that,operatinginthelowconverterdc-linkvoltagerange,thisThesemiconductorchipsassembledinathree-levelNPCCnewsolutionnotonlycanachievehigherefficiencythanmanytypicalthree-l
4、evelstructuresbutalsocanovercometheirdraw-bridge-legmodulearemostlydimensionedneglectingthelossbackofasymmetricalsemiconductorlossdistributionforsomedistributiontothespecificelements.Thisoftenresultsinanoperatingconditions.Therefore,aremarkableincreaseofthe
5、oversizeddesignwithanexpensiveandweaklyutilizedsemi-converteroutputpowercapabilityand/orsystemreliabilitycanconductorarea[8].Inaddition,thetypicalunevenlossdistribu-beaccomplished.Theswitchingstatesandcommutationsofthetionandtheresultingdifferent-junction-
6、temperatureoperationconverter,namedhereashybridNPCC(H-NPCC),areanalyzed,oftheindividualchipdevicescouldleadtounacceptablyhighandaloss-balancingschemeisintroduced.Five-andseven-levelH-NPCCtopologieswithloss-balancingfeaturesarealsopre-thermalstressesonsomep
7、owerdevices,andthermomechanicalsented.Finally,asemiconductor-area-basedcomparisonisusedtodamagecanarise,thusreducingthesystemreliability[9],[10].furtherevaluatemanythree-levelVSCsystems.Interestingly,theAthree-levelactiveNPCC(A-NPCC),whichfeaturesloss-tota
8、lchipareaoftheproposedH-NPCCisalreadythelowestforbalancingcapabilitybetweenthepowerdevices,isshowninlowswitchingfrequencies.Fig.1(d).ThetwoextraactiveswitchesperphaselegaddedtoIndexTermsNeutral-point-clampedc
