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1、內(nèi)蒙古科技大學(xué)碩士學(xué)位論文AbstractDuetothetechnologydevelopmentandenvironmentprotection,somedistributedenergyresources(DER),suchasmicroturbines,photovoltaic,fuelcellsandwindpower,haveenteredpeople’sfieldofvision.However,applicationofindividualdistributedgeneratorscancauseasmanyproblemsasitmaysolve,
2、whichincludingproblemofhighaccesscostsandsingleDERcontrol.Themicro-gridisthemosteffectivewaytomakeeuseofDER.Micro-gridisasmall-sizedgridthatintegratesanumberofmicro-sources,energystoragedevices,controldeviceandloads,whichiscontrollable,andcaneitherbeconnectedtodistributiongridasaspecia
3、lload,ordisconnectedfromtheutilitytooperateinislandmodel.Asagoodsupplementationtothetraditionalpowersupplymodel,micro-gridrepresentsthenewdevelopmentdirectionofpowersystem.Whenthemicro-girdisoperatedinislandmode.Itshouldensurethepowerreliabilityofcrucialloads.Inaddition,differentenergy
4、sourceshavedifferentcharacteristic,whichneeddifferentcontrolmethods.Whenconnectedtotheutility,themicro-sourcesneedonlytosupplyrightamountofpowertokeeppowerbalance.Duringdisturbances,themicro-gridcanseparatefromthedistributionsystemtoisolatethelocalloadfromthedistributiongrid,micro-turb
5、inesimmediatelyswitchtotheV/fcontrolmodetomaintainthemicro-gridvoltageandfrequencystable,andPhotovoltaicmoduleisstillrunningonPQcontroltoexportstableelectricpower.Becauseofthegrid-connectedandindependentoperationisaffectedbythevolatilityofphotovoltaicmodule,themethodofusingphotovoltaic
6、generationcompatiblewithsupercapacitortocurbthePowerfluctuationsofphotovoltaicpowerfluctuationsandvoltagefluctuations.Atlast,throughsimulatingandanalyzingthetransientcharacteristicsofthemicro-Gridonthegridconnectedoperation,theautonomousoperationandride-throughmodethatareconductedinter
7、msoftheloadvariationand3phasesgroundingfault,itshowsthatcontrolstrategyforDERscansurestabilityofmicro-gridandmaintainvoltagequalityatrequiredrange,evenduringislandingtransients.Therefore，theproposeintegratedcontrolapproachisprovedtobeeffectiveandreasonable.Thisdesignofferedapreferabl
