基于改进下垂控制的微网并离网双模式逆变控制器-研究

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1、万方数据ABSTRACTABSTRACTDistributedpowerhasobviousenvironmentalandsocialbenefits．Withthedevelopmentofsmart鲥d，micro-gridhasgainedmoreandmoreattentionfromdomesticandforeignscholars．Theoperationmodeofthemicrogridconsistsofgrid-connectedandoff-grid．Ifsmoothswitchinginthesetwomodescanbeachieved，andwithoutshu

2、ttingdowntheinverter,like’’Hotplug”，thenthedistributedpowerflexibleoperatingmodecanbebetterused．Theinverterofmicro—gridhasbecomeoneofthekeytechnologiesofsmartgridinthefuture．Thecontrolstrategyofmicrogriddeterminesitsoperationinthegrid—connectedandoff-gridpatterns，andaffectsthesmoothnesswhentheoperat

3、ionmodeswitches．Therefore，determiningdualmodemicro-gridcontrolleristheimportantissuestoachievethestableofmicro—grid’Soperation．Thedroopmethodisagoodmethodfortheinvertercontrolleronthedualmodeoperationandseamlessswitchingofthetwomodes．Inthispaper,theCommondistributedpowerincludingfuelcell，photovoltai

4、ccell，windturbineanddieselgeneratorisintroduced．Andthentheconceptofmicrogridandcontroltechnologyissimplyintroduced．AndthecurrentresearchofswitchingofmicrogridoperationmodeisanalyzedInthispaper,basedonmicro-gridmodelingandsimulation，firstly,Byanalyzingthemicro—gridinvertermodelanditsdecouplingprincip

5、le，andstartingfromthetraditionalprincipleofdroopcontrol，droopcontrolmodelwasbuiltbypiece．Combinedwiththepropertiesofgrid-connectedandoff-grid，anddiscoversthatdroopcontrolpolicywhichisappliedindualmodeoperationandseamlessswitchingofthetwomodehasobviousadvantagesforothercontrolstrategy．anditsproblemsh

6、avebeendiscussedfromthepointofviewofthedualmodeoperation．SOGIhavepresentsinductiveat50Hz，andcansuppresstheinputsignalnoise．Accordingthat，thevirtualimpedanceofSOGIcanimproveoutputimpedanceofthedroopcontrollerandharmonicthesuppression．Learnfromtheadvantagesofconventionalgenerators，virtualinertiahasbee

7、naddedtothedroopcontroltoinhibitthesuddenchangeinprocessofIII万方数据广东工业大学硕士学位论文grid-connectedandoff-grid．Andsimulationsystemhasbeenbuilt，bycomparation，discoversthat，Theintroductionofvirtualimpedancebase