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200435thAnnualIEEEPowerEiecironicsSpecialistsConferenceAachen.Germany,2004OperationofaprototypeMicrogridsystembasedonmicro-sourcesequippedwithfast-actingpowerelectronicsinterfacesD.GeorgakislS.Papathanassiou'N.HatziargyriodA.Engle2Ch.Hardt?dimgeo@mail.ntua.grst@power.ece.ntua,grnh@power.ece.ntua.graengler@iset.uni-kassel.deChristian.Hardt@SMA.de'.NationalTechnicalUniversityofAthens(NTUA),Greece*.lnstitutErSolareEnergieversorgungstechnik(ISET),Kassel,Germany'.SMARegelsystemeGmbH,Niestetal,Germanyseamlesstransitioniiomonestatetotheother,asAbstruct-Thepaperpresentsexperimentalresultsfromthedemonstratedbymeasurementsincludedinthispaper.operationofaprototypeMicrogridsystem,installedintheNationalTechnicalUniversityofAthens,whichcomprisesa11.THEEXPERIMENTALMICROGRIDSYSTEMPVgenerator,batteryenergystorage,localloadandacontrolledinterconnectiontotheLVgrid.BoththebatteryA.SysremdescripfionunitandthePVgeneratorareconnectedtotheACgridviafast-actingDUACpowerconverters.TheconvertersareThecompositionofthemicrogridsystemisshowninsuitablycontrolledtopermittheoperationofthesystemeitherFigure1,alongwithaphotooftheactualinstallation.ItisainterconnectedtotheLVnetwork,orinstand-alone(island)modularsystem,comprisingaPVgeneratorastheprimarymode,withaseamlesstransferfromtheonemodetotheother.sourceofpower.TheadditionofasmallWTisalsoplannedThepaperprovidesatechnicaldescriptionofthesystemfortheimmediatefuture.Bothmicrosourcesareinterfacedcomponentsandthecontrolconceptimplemented,alongwithtotheI-phaseACbusviaDC/ACPWMinverters.Aextensivemeasurementresultswhichdemonstrateitsbatterybankisalsoincluded,interfacedtotheACsystemcapabilitytooperateinaforementionedway.theviaabi-directionalPWMvoltagesnurceconverter.ThemicrogridisconnectedtothelocalLVgrid,asshowninFigure2.1.INTRODUCTIONThepenetrationofdistributedgenerationresourcestothelowvoltagegrids,suchasphotovoltaics,CHPmicro-turbines,smallwindturbinesincertainareasandfuelcellsinthenearfuture,isconstantlyincreasing,alte
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