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．Ifsmoothswitchi

2、nginthesetwomodescanbeachieved，andwithoutshuttingdowntheinverter,like’’Hotplug”，thenthedistributedpowerflexibleoperatingmodecanbebetterused．Theinverterofmicro—gridhasbecomeoneofthekeytechnologiesofsmartgridinthefuture．Thecontrolstrategyofmicrogriddetermine

3、sitsoperationinthegrid—connectedandoff-gridpatterns，andaffectsthesmoothnesswhentheoperationmodeswitches．Therefore，determiningdualmodemicro-gridcontrolleristheimportantissuestoachievethestableofmicro—grid’Soperation．Thedroopmethodisagoodmethodfortheinverter

4、controlleronthedualmodeoperationandseamlessswitchingofthetwomodes．Inthispaper,theCommondistributedpowerincludingfuelcell，photovoltaiccell，windturbineanddieselgeneratorisintroduced．Andthentheconceptofmicrogridandcontroltechnologyissimplyintroduced．Andthecur

5、rentresearchofswitchingofmicrogridoperationmodeisanalyzedInthispaper,basedonmicro-gridmodelingandsimulation，firstly,Byanalyzingthemicro—gridinvertermodelanditsdecouplingprinciple，andstartingfromthetraditionalprincipleofdroopcontrol，droopcontrolmodelwasbuil

6、tbypiece．Combinedwiththepropertiesofgrid-connectedandoff-grid，anddiscoversthatdroopcontrolpolicywhichisappliedindualmodeoperationandseamlessswitchingofthetwomodehasobviousadvantagesforothercontrolstrategy．anditsproblemshavebeendiscussedfromthepointofviewof

7、thedualmodeoperation．SOGIhavepresentsinductiveat50Hz，andcansuppresstheinputsignalnoise．Accordingthat，thevirtualimpedanceofSOGIcanimproveoutputimpedanceofthedroopcontrollerandharmonicthesuppression．Learnfromtheadvantagesofconventionalgenerators，virtualinert

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