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1、AbstractResearchonpowerqualitycontrolstrategyinlowvoltageMicrogridAbstractAsanimportantpartofthesmartgridandenergyinternetinthirdindustrialrevolution,Microgridtechnologycombineddifferenttypesofdistributedgeneration,enhancedthereliabilityandflexibilityofthepowersupplyandreducedthepollut
2、ionoftheenvironment,ithasattractedmuchattentionbothathomeandabroadinrecentyears.ButMicrogridclosestotheuser,belongstodistributionnetwork,itsvoltagelevelislowandthecapacityofthedistributedgenerationissmall,soastoitsstableoperationeasilyaffectedbythedisturbanceofthesystemortheload,onesol
3、utiontotheproblemisdesigningreasonablecontrolstrategytoprovidehigh-qualityelectricityforusers.Goodcontrolstrategynotonlycanmakethenewenergyandrenewableenergygenerationeffectivelyused,alsocanrealizetheoptimaleconomicoperationinsidethemicrogrid,ensurethepowerqualityandmaximizethevalueofM
4、icrogridatthesametime.Therefore,in-depthstudyonthecontrolstrategyofMicrogridpowerqualityhasvitalsignificance.First,thispaperelaboratedtheresearchbackground,significanceandrelatedconceptsofMicrogridandanalyzedtheoverseasanddomesticresearchstatusofMicrogrid,thetypesofthepowerqualitycontr
5、olstrategyofMicrogridandtheapplicableoccasionsofeachstrategy,amongthemthehierarchicalcontrolstrategycontainsupperMicrogridcentralcontrollerwiththeunderdroopcontrol,combinedtheadvantagesofvariouscontrolstrategies,hasgoodprospectsfordevelopment.ThenanalyzedthekeytechnologiesoftheMicrogri
6、dpowerqualitycontrolstrategy,mainlyincludingthemathematicalmodelofinverters,spacevectormodulation(SVPWM)algorithm,thephaselockloop(PLL)technique,etc.Inviewofthegeneraldroopcontrolishighlydependentonthelineresistance,whichisdifficulttorealizetheeffectivecontrolofpowerqualityinlowvoltage
7、microgridasthelineresistanceisoftenresistiveorresistor-inductance.Basedonthegeneraldroopcontroltheory,thispaperproposedanuniversalPQ-fVpowercouplingdroopcontrolmethodanddesignedamodifiedPQ-fVmulti-loopcontrolstrategybycombiningtheupperenergyoptimizationmanagementandintroducingtheProp
