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1、ABSTRACTInordertoguaranteehumanenergysafe,reliableandfriendlysupply,whiletoprotecttheecologicalenvironmenthumanmustdependontosurvive,humanmustreducetheuseoffossilfuelsanddevelopcleanandefficientrenewableenergy.Solarenergyasarenewableenergysource,theradiat
2、edenergycanbeconvertedintoenergyweneed,itsdevelopmentandusereceivetheworld'sattention.Atpresent,thevastmajorityofphotovoltaicpowergenerationsystemcanachievegridconnectedoperation,Butwithsuchalargenumberofpowersystemconnectedtothegrid,ifcontinuetousethetra
3、ditionalconstantpowergridoperationwillaffectthesysteminertia.Inertiareducesmeansthatthesystemantiimpactcapabilitybecomesweakandpoorstability,meanwhile,withalargenumberofmicropoweraccess,powerqualitywillalsobeahit.Inordertoprovidehighqualityelectricenergya
4、ndminimizetheimpactofgridconnectedphotovoltaicongridinertia,thispapermaininthefollowingtwoaspectsarestudied.Inordertomakethemicronetworkcantaketheinitiativetoparticipateintheadjustmentofthesystemvoltage,frequency,guaranteethestabilityofthesystem,thearticl
5、eimprovesthetraditionaldroopcontrol,powercontrollerusingP-fdroopcontrolandQ-ΔUdroopcontrolcombinedcontrolmethod,Qrepresentsthereactivepowerofdistributedpoweroutput,ΔUrepresentsthechangevalueofthedistributedpoweroutputvoltage,thecontrolmethodcombinesthetra
6、ditionaldroopcontrolactivepowerisproportionaltotheequilibriumaccordingtothecapacity,whileusingtheQ-ΔUdroopcontrolandΔUrecoverymechanismcombinedmethod,canwellimprovethereactivepowerdistributionamongmultipledistributedpowersupply.InnerringUSESthevoltageandc
7、urrentdoubleloopcontroller,currentcontrollerusestheproportionlinktoimprovethesystemresponsespeed,voltagecontrollerusingPIcontroltostabilizetheloadvoltage.throughdesigningcontrollerparametersmakeitsoutputimpedanceisperceptual,useimprovedpowercontrollerandv
8、oltagecurrentdoubleloopcontrolcombinedcanrealizehetraditionaldroopcontrolinthelowvoltagepowerdistributionnetwork,reducetheimpactofdistributedpoweronpowergridatthesametimeguaranteethereactivepowerallocationisproporti