基于下垂控制的微网逆变器双模式统一控制器分析

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1、ResearchonDroopControlBasedUniformControllerforDual-modeInvertersinaMicrogridABSTRACTItisalreadytheconsensusoftheelectricpowerindustrydomesticandabroadthatmicrogridisoneofthekeytechnologiesofthefuturesmartgrid.Microgridcanoperateineithergrid-tiedmodeoroffgridmodeintentiona

2、llywhenthepowergridfails.Voltagesourcemicrogridinverteriscriticalequipmentformicrogridseamlessswitchingbetweengrid-tiedandoff-gridmodes.Wirelessdroopcontrolmethod(WDCM)isoneoftheeffectivewaysformicrogridinvertertorealizedualmodecontrolandseamlesstransfer.Butoutputpowercont

3、rolaccuracyofparallelinvertersadoptingWDCMisgreatlyinfluencebythelineimpedance.Itisdifficulttorealizeaccurateproportionalshareoftheloadpowerforparallelinvertersinoff-gridmode,anddifficulttorealizeaccuratetrackofpowercommandforinvertersingrid-tiedmode.Thesefeaturesmakethest

4、udyofthedualmodeinverterbasedondroopcontrolbecomeadifficulty.Inthispaper,forthedesigningproblemofmicrogridinverterdualmodecontrollersupportingmicrogridoperationinbothgrid-tiedandoff-grid,deepresearchondroopcontrolprincipleiscarriedoutandthemainfactorsimpactingoutputpowerpr

5、ecisecontrolofmicrogridinverterbasedondroopcontrolmethodareanalyzedundermulti-invertersoperatingconditionsofthemicrogridsystem.Thendual-modeunifieddroopcontrollerdesignmethodbasedonlocalsamplingisproposed.Themaincontentsofthespecificresearchandinnovativeworkareasfollows:（1

6、）AccordingtocomprehensiveanalysisandcompareofexistingWDCMmethod,itisfoundthatthedroopcontrollerbasedonthevoltageamplitudefeedbackhasobviousadvantagesoverothercontrolmethodswithgoodfeaturesofanti-disturbanceonthesystemparametersandaccurateactiveandreactivepowercontrol.Howev

7、er,thepremiseisthatsamplingpointofthevoltagerequiredbythecontrollermustbelocatedatthePCC.Whentheinverterisfarfromthecommonbus,thelongdistancesamplingsignallinewillnotonlyintroduceinterference,resultinginsignaldelay,butalsoisnotbenefittothemodulardesignofthemicrogridinverte

8、rs.（2）Fortheproblemsofthemethodsabove,improvedWDCMcontrolmethodbasedonthelocalsamplingisp