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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.28,NO.11,NOVEMBER20135049AHighStep-UpThree-PortDCDCConverterforStand-AlonePV/BatteryPowerSystemsYen-MoChen,StudentMember,IEEE,AlexQ.Huang,Fellow,IEEE,andXunweiYu,StudentMember,IEEEAbstractAthree-portdcdcconverterintegratingphotovoltaic(PV)andbatterypowerforhi
2、ghstep-upapplicationsisproposedinthispaper.Thetopologyincludesfivepowerswitches,twocoupledinductors,andtwoactive-clampcircuits.Thecoupledinductorsareusedtoachievehighstep-upvoltagegainandtoreducethevoltagestressofinputsideswitches.Twosetsofactive-clampcir-cuitsareusedtorecycletheenergystoredinthele
3、akageinductorsandtoimprovethesystemefficiency.Theoperationmodedoesnotneedtobechangedwhenatransitionbetweencharginganddis-chargingoccurs.Moreover,trackingmaximumpowerpointofthePVsourceandregulatingtheoutputvoltagecanbeoperatedsi-multaneouslyduringcharging/dischargingtransitions.Aslongasthesunirradia
4、tionlevelisnottoolow,themaximumpowerpointtracking(MPPT)algorithmwillbedisabledonlywhenthebatterychargingvoltageistoohigh.Therefore,thecontrolschemeoftheproposedconverterprovidesmaximumutilizationofPVpowermostofthetime.Asaresult,theproposedconverterhasmeritsofhighboostinglevel,reducednumberofdevice
5、s,andsimplecontrolstrategy.Experimentalresultsofa200-Wlaboratoryprototypearepresentedtoverifytheperformanceoftheproposedthree-portconverter.IndexTermsDCmicrogrid,energystorage,highstep-upappli-cation,hybridpowersystem,renewableenergysource,three-portconverter.I.INTRODUCTIONFig.1.PartoftheFREEDMsys
6、temdiagramshowinganSST-enabledDCNTEGRATEDmultiportconvertersforinterfacingseveralmicrogrid.Ipowersourcesandstoragedevicesarewidelyusedinrecentyears.Insteadofusingindividualpowerelectronicconvertersforeachoftheenergysources,multiportconvertershavethead-hybridenergysupplyusingrenewableenergysourcesa
7、ndstor-vantagesincludinglesscomponents,lowercost,morecompactagedevicesisshowninFig.1.Thedcmicrogridenabledbythesize,andbetterdynamicperformance.Inmanycases,atleastsolid-statetransformer(SST)intheFutureRenewableEl
