基于热泵群灵活控制的电热微网联络线功率分层协同平抑策略.docx

基于热泵群灵活控制的电热微网联络线功率分层协同平抑策略
Abstract
Withthedevelopmentofrenewableenergy,theintegrationofdistributedenergyresources(DERs)inmicrogridhasbecomeanimportantissue.However,thevariabilityandintermittencyofrenewableenergysources,suchaswindandsolarpower,poseagreatchallengetothestabilityofmicrogrid.Inthispaper,aflexiblecontrolstrategybasedonheatpumpgroupsisproposedtosmoothlybalancethepowerbetweenmicrogridsegmentsandbufferthefluctuationscausedbyrenewableenergysources.
Firstly,thestructureofthemicrogridandtheoperationprinciplesofheatpumpgroupsarebrieflyintroduced.Then,thehierarchicalcontrolstrategyforpowerdistributionamongdifferentsegmentsofmicrogridispresented.Theheatpumpgroupsareusedtobalancethepowerbetweenadjacentsegmentsinrealtime,whicheffectivelymitigatestheimpactofrenewableenergyfluctuationsonmicrogridstability.Finally,simulationresultsareprovidedtoverifytheeffectivenessandfeasibilityoftheproposedcontrolstrategy.
Introduction
Microgridisamodernformofdistributedpowersystem,whichischaracterizedbytheuseofvariousdistributedenergyresources(DERs),includingwindpower,solarpower,energystorage,andcombinedheatandpower(CHP)systems.Microgridisabletooperateinbothgrid-connectedandislandedmodes,whichprovidesresiliencyandreliabilitytotheelectricitynetwork.However,theintegrationofrenewableenergysourcesinmicrogridbringsgreatchallengingtothestabilityandcontrolofthesystemduetothevariabilityandintermittencyofrenewableenergy.
Inordertomaintainthestabilityandimprovetheefficiencyofmicrogridoperation,variouscontrolstrategieshavebeenproposed.Amongthem,thepowerallocationandcontrolstrategyiscrucialformicrogridoperation.Thetraditionalpowerallocationstrategyisbasedoncentralizedcontrol,whichisnotsuitableforthecomplexanddynamicenvironmentofmicrogrid.Therefore,ahierarchicalcontrolstrategyisproposedtoimprovetheflexibilityandadaptabilityofthesystem.
Inthispaper,aflexiblecontrolstrategybasedonheatpumpgroupsisproposedtosmooththepowerflowbetweendifferentsegmentsofmicrogridandbufferthefluctuationscausedbyrenewa