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1、DesignandControlofProportional-ResonantControllerBasedPhotovoltaicPowerConditioningSystemHanjuCha*,Trung-KienVu*andJae-EonKim***ChungnamNationalUniversity/DepartmentofElectricalEngineering,Daejon,Korea**ChungbukNationalUniversity/DepartmentofElectricalEng
2、ineering,Cheongju,KoreaAbstract--Thispaperpresentsacurrentcontroltechniqueforasingle-phasegrid-connectedDC/ACinverterwhichisusedinPhotovoltaicpowerconditioningsystem(PVPCS).AProportional-Resonant(PR)controllerisusedforreplacingtheconventionalProportional-
3、Integral(PI)controllerinthissystem.BycomparisonwiththeconventionalPIcontrolmethod,thePRcontrolcanintroduceaninfinitegainatthefundamentalfrequencyandhencecanachievezerosteady-stateerror.AtheoreticalanalysisofthePRcontrollerispresentedandverifiedbyexperimen
4、t.Furthermore,apseudosynchronousd-qtransformationisemployedincurrentcontrolschemeandanFig.1Blockdiagramofsingle-phasegridconnectedPVPCSall-passfilterbasedsingle-phasedigitalphase-lockedloop(PLL)isintroducedtodetectthephaseofgridvoltage.BasedonthePVpowerco
5、nditioningsystem(PVPCS),asdepictedintheoreticalanalysis,thecontrolstrategyisimplementedona32-Figure1,isusuallybuiltwithProportional-Integral(PI)bitfixed-pointTMS320F2812DSPandtestedina3kWprototypePVPCS.Simulationandexperimentalverifythehighcontrollerincur
6、rentcontrolscheme[4].Inordertoachieveperformanceoftheimplementedcontrolscheme.zerosteady-stateerror,aProportional-Resonant(PR)controllerbasedcurrentcontrolwhichisusedtoreplacetheIndexTerms—Dc/Acinverter,Photovoltaic,Proportional-conventionalPIcontrolleris
7、implementedforthegrid-Resonance(PR)controller.connectedDC/ACinverterinthePVPCS.ComparedwithI.INTRODUCTIONtheconventionalPIcontrol,theintroducedPRcontrolcanovercometwowell-knowndrawbacksofPIcontrol:inabilityNowadays,moreandmoreconcernofphotovoltaic(PV)totr
8、ackasinusoidalreferencewithzerosteady-stateerrorenergyhasbeenfocusedoninterconnectionbetweenthePVandpoordisturbancerejectioncapability.Duetoaninfinitepowersystemsandthegrid.Generally,thegrid-connectedgainatthefundam
