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1、硕士学位论文AbstractUnderthepressuresofresourceshortages,environmentalissues,thegridsecurityandreliabilityrequirements,thetraditionalpowerproductionandtransmissionarebeingchangedgradually.Basdontheuseofrenewableenergyresources,thedistributedgeneration(DG)isbeingpene
2、tratedintogridsystemrapidly.Inrecentyears,withitshigherenergyefficiency,lesslossesoftransmissionanddistribution,higherreliability,lesspollution,etc,DGhasreceivedmuchattention.InordertoreducetheadverseeffectsofDGaccesstothegrid,whilemaximizingitsstrengthstobett
3、erpromotetheintegrationandapplicationoflarge-scaleDGsystem,theconceptofmicrogridwasraised.TheinverterisusedastheinterfacetoconnectmostofDGstothegrid.Asamicro-gridbasicpowerelectronicsinterface,itsreasonableandeffectivecontrolwouldimpactonthesecurityandstabilit
4、yofmicrogridoperationdirectly.Withvirtualsynchronizationcontroltechnologyandgoodperformanceinthedistributedgenerationcontrol,ithasdrawngreatattentions.Thispaperincludes:(1)Fromamathematicalmodelofthesynchronousgenerator,virtualsynchronizationcontrolstrategyisa
5、nalysed.Thencombiningwithdroopcharacteristecsofsynchronousgenerator,theimplementationprocessofthetwocontrolloopsincludingactive/frequency,reactivepower/amplitudeofvirtualsynchronizationcontrolisderivedindetail.Smallsignalmodelofvirtualsynchronizationcontrolstr
6、ategyisbuild.Moreover,basedthiscontrolamicrogridmodelisbuiltinPSCAD/EMTDC,fromwhichthephaseresponseiscomparedwithsmallsignalmodelfromMATLAB,theconsistencybetweenbothverifiesthecorrectofthesmallsignalmodelbuilt.(2)Microgridneedstobeoperatedinthegrid-connectedor
7、islandedmode,andtheseamlesstransferbetweenbothisrequred.Aclearlyanalysisofimplementationprocessofthevirtualimpedancemannerispresented,aswellasoperationcharacteristicsoftransferringfromgrid-connectedmodetoislandedmode,toachieveseamlesstransferofmicrogridoperati
8、onmodesbasedonvirtualsynchronizationcontrol.Fortheproblemthatgrid-connectcannotachievedwithloadbasedonthismethod,anon-impactmethodtoconnecttothegridwithloadisproposedwithoutanydide
