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1、1398IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.53,NO.5,OCTOBER2006OverviewofControlandGridSynchronizationforDistributedPowerGenerationSystemsFredeBlaabjerg,Fellow,IEEE,RemusTeodorescu,SeniorMember,IEEE,MarcoLiserre,Member,IEEE,andAdrianV.Timbus,StudentMember,IEE
2、EAbstractRenewableenergysourceslikewind,sun,andhydroareseenasareliablealternativetothetraditionalenergysourcessuchasoil,naturalgas,orcoal.Distributedpowergenerationsystems(DPGSs)basedonrenewableenergysourcesexperiencealargedevelopmentworldwide,withGermany,Denmark
3、,Japan,andUSAasleadersinthedevelopmentinthisfield.DuetotheincreasingnumberofDPGSsconnectedtotheutilitynetwork,newandstricterstandardsinrespecttopowerquality,saferun-ning,andislandingprotectionareissued.Asaconsequence,thecontrolofdistributedgenerationsystemsshouldb
4、eimprovedtomeettherequirementsforgridinterconnection.ThispapergivesanoverviewofthestructuresfortheDPGSbasedonfuelcell,photovoltaic,andwindturbines.Inaddition,controlstructuresofFig.1.Installedcapacityattheendof2004.(a)WindenergyinEurope[2].thegrid-sideconverterar
5、epresented,andthepossibilityofcom-(b)PVpowerintheworld[3].pensationforlow-orderharmonicsisalsodiscussed.Moreover,controlstrategieswhenrunningongridfaultsaretreated.Thispaperendsupwithanoverviewofsynchronizationmethodsandadiscussionabouttheirimportanceinthecontrol
6、.aroundtheworldhasledtoalargeinterestandfastdevelopmentIndexTermsControlstrategies,distributedpowergeneration,ofwindturbine(WT)technologyinthelastdecade[2].Atotalgridconvertercontrol,griddisturbances,gridsynchronization.amountofnearly35-GWwindpowerhasbeeninstalle
7、dinEuropebytheendof2004,asshowninFig.1(a).AnotherrenewableenergytechnologythatgainsacceptanceI.INTRODUCTIONasawayofmaintainingandimprovinglivingstandardswithoutOWADAYS,fossilfuelisthemainenergysupplieroftheharmingtheenvironmentisthephotovoltaic(PV)technology.Nwor
8、ldwideeconomy,buttherecognitionofitasbeingaAsshowninFig.1(b),thenumberofPVinstallationshasanmajorcauseofenvironmentalproblemsmakesthemankindtoexponentialgrowth
