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1、AbstractResearchonpowerqualitycontrolstrategyinlowvoltageMicrogridAbstractAsanimportantpartofthesmartgridandenergyinternetinthirdindustrialrevolution,Microgridtechnologycombineddifferenttypesofdistributedgeneration,enhancedthereliabilityandflexibilityofthe
2、powersupplyandreducedthepollutionoftheenvironment,ithasattractedmuchattentionbothathomeandabroadinrecentyears.ButMicrogridclosestotheuser,belongstodistributionnetwork,itsvoltagelevelislowandthecapacityofthedistributedgenerationissmall,soastoitsstableoperat
3、ioneasilyaffectedbythedisturbanceofthesystemortheload,onesolutiontotheproblemisdesigningreasonablecontrolstrategytoprovidehigh-qualityelectricityforusers.Goodcontrolstrategynotonlycanmakethenewenergyandrenewableenergygenerationeffectivelyused,alsocanrealiz
4、etheoptimaleconomicoperationinsidethemicrogrid,ensurethepowerqualityandmaximizethevalueofMicrogridatthesametime.Therefore,in-depthstudyonthecontrolstrategyofMicrogridpowerqualityhasvitalsignificance.First,thispaperelaboratedtheresearchbackground,significan
5、ceandrelatedconceptsofMicrogridandanalyzedtheoverseasanddomesticresearchstatusofMicrogrid,thetypesofthepowerqualitycontrolstrategyofMicrogridandtheapplicableoccasionsofeachstrategy,amongthemthehierarchicalcontrolstrategycontainsupperMicrogridcentralcontrol
6、lerwiththeunderdroopcontrol,combinedtheadvantagesofvariouscontrolstrategies,hasgoodprospectsfordevelopment.ThenanalyzedthekeytechnologiesoftheMicrogridpowerqualitycontrolstrategy,mainlyincludingthemathematicalmodelofinverters,spacevectormodulation(SVPWM)al
7、gorithm,thephaselockloop(PLL)technique,etc.Inviewofthegeneraldroopcontrolishighlydependentonthelineresistance,whichisdifficulttorealizetheeffectivecontrolofpowerqualityinlowvoltagemicrogridasthelineresistanceisoftenresistiveorresistor-inductance.Basedonthe
8、generaldroopcontroltheory,thispaperproposedanuniversalPQ-fVpowercouplingdroopcontrolmethodanddesignedamodifiedPQ-fVmulti-loopcontrolstrategybycombiningtheupperenergyoptimizationmanagementandintroducingtheProp
