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1、AbstractRESEARCHONTHECONTROLSTRATEGYFORPARALLELINVERTERSINLOWVOLTAGEMICROGRIDABSTRACTWiththedevelopmentofsocietyandeconomy,people’sdemandforelectricityisincreasingdaybyday.Themicrogridcomposedbydistributedpowersourceshasattractedmoreandmoreattentionbecauseofitslowpollution,hig
2、hefficiencyandgoodcontrolabilityandsoon.Microgridhasallkindsofparallelmicro-sources,invertersaretheinterfacebetweenallkindsofmicro-sourcesandthegrid.Effectivecontrolstrategyforparallelinverterscanbeusedtoensurestableoperationofthesystemandprovidetheuserhighqualityelectricity.T
3、hus,studyonthecontrolstrategyforparallelinvertersinmicrogridhasvitalsignificance.Inthisthesis,theparallelinvertersinlowvoltagemicrogridweretakenastheresearchobject.Themathematicalmodelofinvertersbasedonthethreecoordinatesystemwasestablished.Andthenanalyzedtheselectoffiltersand
4、themethodforparameterssettingoffilters.Bycomparingthecontrolstrategiesforinterfaceinvertersinmicrogrid,inviewofthecontrolrequirementsofparallelinvertersinlowvoltagemicrogrid,droopcontrolwithnotie-linewaschosentodoresearch.Inviewofthegeneraldroopcontrolishighlydependentonthelin
5、eresistance,whichisdifficulttobeusedinlowvoltagemicrogrid.Improveddroopcontrolbasedonthelineresistancewasadopted,whichrealizedpowersharing.Butthebigcirculatingcurrentresultsfromthesmallnumericalofequivalentoutputimpedanceofinverters.Thevirtualimpedanceisaddedtoimproveoutputimp
6、edancecharacteristicofinverters,reducecirculatingcurrent,whilethevoltage-dropofinverters’outputincreaseatthesametime.Acontrolstrategybasedondynamicvirtualimpedanceforparallelinverterswasproposedtosolvetheaboveproblems.Thevalueofvirtualimpedanceadjustedunderthedynamicvirtualimp
7、edanceloop.Thiscontrolstrategycanreducevoltage-dropwhenthesystemsatisfiesstabilityconditions.Takingtwoparallelgrid-connectedinvertersasanexample,thesystemsimulationmodelwasbuiltunderMatlab/Simulinkenvironmentandtheproposedcontrolstrategywassimulated.Thesimulationresultsshowtha
8、ttheproposedcontrolstrategyinthispapercanrealizegoodpowershar
