可再生能源微电网的建模与控制

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1、ABSTRACTMicro—gridisasmallpowerdistributionsystemcanrealizeselfcontrol，protectionandmanagement，whichiscomposedbydistributedgenerations，energystorages，loads，themonitoringunitsandprotector,etc．Micro—gridposseshighflexibility,whichcangivefullplaytothevalueandefficiencyofthedistributedener

2、gysourcessuchasrenewableenergyandreducethehighpermeabilityoftheinfluenceofthedistributedpoweraccesstOpowergrid．Micro—gridisthedirectionofthedevelopmentofelectricpowersysteminthefuture．Inthepaper,alowvoltagemicro—gridsystemmodelwhichcontainsavarietyofdistributedpowerandenergystorageisbu

3、iltbyoverallmodelingseveralmaindistributedpowergenerationsanditsgridconverter,studiedandanalysistheoperatingcharacteristicsofislandandgrid—connectedmodesbasedonmaster-slavecontrolstrategy．Comprehensiveanalysisoftheresearchbackgroundandsignificanceofmicro-gridanditsresearchstatusathomea

4、ndabroad，themicro—gridoperationcontrolmodesandthekeyproblemsoftheresearchofmicro-grid．Modelofprimemoveroffixedpitchpermanentmagnetdirect—drivewindturbinewhichisbasedonconstanttipspeedratiocontrolisestablished．Then，Elaboratedseveralcommonbatteryequivalentcircuitandaccordingtotheworkingp

5、rincipleandstructureofphotovoltaicarray,modelsofbatteryandphotovoltaicaresetup，whicharevalidatedbyPSCADandcanwellpresenttheoutputcharacteristicsofsolarphotovoltaiccells．Accordingtothemathematicalofthegridconverter,thestructurediagramofcurrentinnerloopcontrollerisdeduced，combinedwithout

6、erpowerloop，whichcouldrealizetheconstantpowercontrolofthegrid—connectedsystem．Accordingtothemeasuredvalueoftheacbus仔equencyandvoltageanddroopcharacteristics，akindofV／fcontrolstrategybasedondroopcharacteristicsisproposed，whichCandeterminetheoutputofactiveandreactivepowerandproviderefere

7、nceforcurrentloop，finallyrealizetheconstantpressureconstantvoltageand仔equencycontr01．ThecontroloftheenergystorageunitandtheMPPTcontrolofphotovoltaicgenerationsystemsarestudiedinthispaper．AvariableuniversefuzzycontrolalgorithmforglobalMPPTbasedonmultiplepeakcharacteristiccurveispropos