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1、ResearchonDroopControlBasedUniformControllerforDual-modeInvertersinaMicrogridABSTRACTItisalreadytheconsensusoftheelectricpowerindustrydomesticandabroadthatmicrogridisoneofthekeytechnologiesofthefuturesmartgrid.Microgridcanoperateineithergrid-tiedmodeoroffgridmodeintentionallywhenthepowergridfails
2、.Voltagesourcemicrogridinverteriscriticalequipmentformicrogridseamlessswitchingbetweengrid-tiedandoff-gridmodes.Wirelessdroopcontrolmethod(WDCM)isoneoftheeffectivewaysformicrogridinvertertorealizedualmodecontrolandseamlesstransfer.ButoutputpowercontrolaccuracyofparallelinvertersadoptingWDCMisgrea
3、tlyinfluencebythelineimpedance.Itisdifficulttorealizeaccurateproportionalshareoftheloadpowerforparallelinvertersinoff-gridmode,anddifficulttorealizeaccuratetrackofpowercommandforinvertersingrid-tiedmode.Thesefeaturesmakethestudyofthedualmodeinverterbasedondroopcontrolbecomeadifficulty.Inthispaper
4、,forthedesigningproblemofmicrogridinverterdualmodecontrollersupportingmicrogridoperationinbothgrid-tiedandoff-grid,deepresearchondroopcontrolprincipleiscarriedoutandthemainfactorsimpactingoutputpowerprecisecontrolofmicrogridinverterbasedondroopcontrolmethodareanalyzedundermulti-invertersoperating
5、conditionsofthemicrogridsystem.Thendual-modeunifieddroopcontrollerdesignmethodbasedonlocalsamplingisproposed.Themaincontentsofthespecificresearchandinnovativeworkareasfollows:（1）AccordingtocomprehensiveanalysisandcompareofexistingWDCMmethod,itisfoundthatthedroopcontrollerbasedonthevoltageamplitud
6、efeedbackhasobviousadvantagesoverothercontrolmethodswithgoodfeaturesofanti-disturbanceonthesystemparametersandaccurateactiveandreactivepowercontrol.However,thepremiseisthatsamplingpointofthevoltagerequiredbythecontrollermustbelocatedatthePCC.Whentheinverterisfarfromthecommonbus,thelongdistancesam
7、plingsignallinewillnotonlyintroduceinterference,resultinginsignaldelay,butalsoisnotbenefittothemodulardesignofthemicrogridinverters.（2）Fortheproblemsofthemethodsabove,improvedWDCMcontrolmethodbasedonthelocalsamplingisp
