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1、5098IEEETRANSACTIONSONPOWERELECTRONICS,VOL.28,NO.11,NOVEMBER2013IntegrationandOperationofaSingle-PhaseBidirectionalInverterWithTwoBuck/BoostMPPTsforDC-DistributionApplicationsTsai-FuWu,SeniorMember,IEEE,Chia-LingKuo,Kun-HanSun,Yu-KaiChen,Yung-RueiChang,Member,IEEE,andYih-De
2、rLee,Member,IEEEAbstractThisstudyisfocusedonintegrationandoperationofasingle-phasebidirectionalinverterwithtwobuck/boostmaximumpowerpointtrackers(MPPTs)fordc-distributionapplications.Inadc-distributionsystem,abidirectionalinverterisrequiredtocon-trolthepowerflowbetweendcbusa
3、ndacgrid,andtoregulatethedcbustoacertainrangeofvoltages.Adroopregulationmechanismaccordingtotheinverterinductorcurrentlevelstoreducecapac-itorsize,balancepowerflow,andaccommodateloadvariationisproposed.Sincethephotovoltaic(PV)arrayvoltagecanvaryfrom0to600V,especiallywiththin
4、-filmPVpanels,theMPPTtopologyisformedwithbuckandboostconverterstooperateatthedc-busvoltagearound380V,reducingthevoltagestressofitsfollowedinverter.Additionally,thecontrollercanonlinechecktheinputconfigurationofthetwoMPPTs,equallydistributethePV-arrayoutputcurrenttothetwoMPPTs
5、inparalleloperation,andswitchcontrollawstosmoothoutmodetransition.AcomparisonbetweentheconventionalboostMPPTandtheproposedbuck/boostMPPTintegratedwithaPVinverterisalsopresented.Experimentalre-sultsobtainedfroma5-kWsystemhaveverifiedthediscussionandfeasibility.IndexTermsBidir
6、ectionalinverter,buck/boostmaximumFig.1.Configurationofadc-distributionsystem.powerpointtrackers(MPPTs),dc-distributionapplications.newableenergyforlow-voltagedc-distributionsystems,owingI.INTRODUCTIONtothemeritsofclean,quiet,pollutionfree,andabundant.Inthedc-distributionapp
7、lications,apowersystem,includingre-ANYtypesofrenewableenergy,suchasphotovoltaicnewabledistributedgenerators(DGs),dcloads(lighting,airM(PV),wind,tidal,andgeothermalenergy,haveattractedconditioner,andelectricvehicle),andabidirectionalinverter,alotofattentionoverthepastdecade[
8、1][3].AmongtheseisshowninFig.1,inwhichtwoPVarrayswithtwomaximumnaturalresources,th
