双Buck逆变器的拓展研究

南京航空航天大学硕士学位论文双Buck逆变器的拓展研究姓名：蔡兆奇申请学位级别：硕士专业：电力电子与电力传动指导教师：王慧贞20080101iUPSBuckBuckBuckBuckBuckBuckBuckBuck/BoostBuck/BoostBuckBuckiiABSTRACTAsanimportantbreedofpowerconverters,voltagesourcePWMinverter(VSI)hasbeenwidelyusedinindustrialapplications,suchasuninterruptiblepowersupplies(UPS),activefilters,motordrivesanddistributedpowergenerators(DG).Furtherenhancementofvoltagesourceinverter’sperformances,particularlyitspowerdensityisofvitalimportance.Dualbuckhalfbridgeinverter(DBI)isanovelinvertertopology,whichfeaturesthepropertyofnoshoot-throughproblem.Thismakesitpreferableinreliabilitydemandingoccasions.Inaddition,thebodydiodesoftheswitchesinDBIarenotinvolvedinthewholeworkingduration,sothereverserecoveryproblemismitigated,andthepowerdevicescanbeseparatelyoptimized.ThisdesirablepropertygivesDBIthebenefitofafulluseofthenewestpowerdevices,whichresultsinlowerswitchinglossandtherebytheprobabilityofhigherswitchingfrequency.However,thevoltagestressofDBIistwiceoftheDCvoltagesources,anditisunsuitableforhighvoltageapplications.Thisthesisfirstfocusesonadiodeclampedthree-leveldualbuckhalfbridgeinverter(TLDBI),whichisanoutwardexpansionofDBIinhighvoltageapplications.TLDBInotonlyretainsallthemeritsofDBI,butithasalowervoltagestressofpowerdevices.Meanwhile,harmoniccomponentofbridgeoutputvoltageismuchlowerbecauseitisthree-levelmodulatedwhichissuperiortotwo-levelmodulationinharmonicperformance.Topologyconfigurationtheoryandadualbandthree-levelhysteresiscurrentcontrollerareanalyzedindetail;simulationsandexperimentsarecarriedouttoconfirmitspracticalperformances.Atlast,anovelsingle-stageBuck/BoostinverterisproposedbasedonthehalfloadmodecontrolstrategyjustasDBI,whichstillworkswhentheDClinkvoltageislowerthantheACvoltage.Theprinciplesofthecircuitareexplainedindetail.Thesimulationandexperimentresultsbothindicateitsfeasibility.Keywords:inverter,dualbuck,threelevel,hysteresisband,powerdensityBuckvi1.1Buck.............................................................61.2Buck..................................................71.3Buck/Boost...................................................................82.1Buck........................................................................102.2................................................................112.3.........................................................122.4.........................................................132.5...................................................................132.6..........................142.7..................................................152.8Buck............................152.9TLDBI......................................................172.10TLDBI.........................................................................193.1................................................................223.2Buck...........................................................233.3...............................................243.4DBI.............................243.5HCC.................................................253.6...........................................263.7TLDBI......................273.8TLDBI(iouo)..........................283.9TLDBI(iouo)..........................284.1...........................................314.2...........................................324.3.........324.4.....................................334.5.....................................334.6..34vii4.7.....................................344.8.....................................354.9..354.10............................364.11....................................364.12.....................................................................384.13............................................................................394.14..................................................................394.15.....................................................................405.1...................................................................415.2Buck/Boost...................................................425.3Buck/Boost...................................................455.4Buck/Boost...................................................465.5Buck/Boost................................................475.6ZCDBuck/Boost..................................485.7ZCDBuck/Boost..............505.8Buck/Boost...................................................51Buckviii2.1TLDBI........................................................................................162.2HBIDBIFBITLDBI....................................................164.1...................................................................................................................375.1...................................................................................................50ixSOASafeOperationalAreaEMIElectroMagneticInterferenceDC/DCDirectCurrent/DirectCurrentPWMPulseWidthModulationMOSFETMetallicOxideSemiconductorFieldEffectTransistorDBIDualbuckInverterTLDBIThree-leveldualbuckInverterUPSUninterruptiblePowerSupplySPWMSinePulseWidthModulation