资源描述:
《基于储能装置的微网运行特性的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、内蒙古科技大学硕士学位论文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