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1、ABSTRACTABSTRACTDistributedpowergeneration(DG)systemhasbeenrapidlydevelopedinrecentyears,butitalsohasitsowndisadvantages,suchaspowerqualityandsystemreliabilitydecreasewhenDGsystemisconnectedtothemaingrid.InordertoovercometheseshortagesandtakeadvantagesofDGunit
2、s,theconceptofMicro-gridisproposed.Asaveryadvancedresearchfield,Micro-gridtechnologywillbegreatlydevelopedandresearched.Bynow,thedevelopmentofMicro-gridisstillinitsinfancyandtherearesomeproblemsweshouldconcernabout,suchaspowerquality,themodelingofparalleledgri
3、d-connectedinvertersandtheinteractionbetweeneachinverter.Accordingly,theanalysisinthispaperismainlyfocusedontheresonanceofsingleinverter,themodelingofparalleledgrid-connectedinvertersandtheresonanceoftheparalleledsystem.Firstly,thetopologyandthemathematicalmod
4、elbasedonsynchronousrotatingreferenceframeofthegrid-connectedinverterareanalyzed,andthenmakeabriefanalysisaboutLCLfilter.Onthisbasis,theinnercurrentloopispresentedforthefurtherstudyinthefollowingchapters.Secondly,adepthresearchaboutresonancesuppressionstrategy
5、intheLCLbasedgrid-connectedinverterisdonebothins-domainandz-domain.Forthepassivedampingstrategy,impactonthehighfrequencycharacteristicsandlowfrequencycharacteristicsofthegrid-connectedsystemwithdampingresistanceinthedifferentpositionisanalyzed;moreover,theinfl
6、uenceonsystemstabilityandfilteringperformancewithdifferentresistancevaluesisstudiedalso.Fortheactivedampingstrategy,thebasicactivedampingmethodsoffiltercapacitorcurrentfeedbackmethodandfiltercapacitorvoltagefeedbackmethodarestudiedins-domainandz-domainwithdiff
7、erentratiosofresonancefrequencyandcontrolfrequency.Furthermore,theinfluenceofgridimpedanceisanalyzedeither.Thirdly,Nortonequivalentmodelofthethree-phasegrid-connectedinverterispresented.Onthisbasis,thesamemethodisusedinthemodelingoftheparalleledgrid-connectedi
8、nvertersystemintheMicro-grid,thustheNortonequivalentmodelofparalleled-systemisobtained.Theninternalresonanceofeachinverter,parallelIIABSTRACTresonanceamonginvertersandseriesresonan
