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1、Abstract曼曼量曼曼曼曼曼曼曼曼舅曼曼曼魯曼皇i——i———————————————————————————————————一————．Li曼曼!曼Wjththedevelopmentofeconomic，thedemandforelectricityisgrowing，andthescaleofthepowergridsisexpanding．Asthegridsbecomemorecomplex，thedrawbacksoflargepowergridarebecomingmoreandmoreapparent．Toacertainextent，theproposionof
2、themicrogridconceptalleviatestheproblemsbroughtaboutbythepowergridexpansion．Asaneffectivecomplementoflargepowergrids，themicrogridplaysanimportantroleinimprovingthereliabilityofpowersupply，implementingtheadvantagesofdistributedgenerationsandpromotingthrperformanceofthegrids，whichhasbecomeoneofth
3、emaindirectionsofthedevelopmentofpowersystem．Andproperconfigurationofmictogeneration’Stype，locationandsizewhichmakesthesystemoperatesafelyandeconomically,iSanimportantproblemthatmustbesolvedwithmicrogrid’Sdeveloping．Consideringthecharacteristicsofmicrogrid，theoptimalsitingandsizingofmicrogenera
4、tions(MG)inamicrogridisstudiedinthispaper．Theoverallsystem’Sreliabilityandeconomyisconsidered．Andstochasticnatureofthemicrogrid，suchastherandomnessnatureofwindandsolarenergy，istakenintoaccountaswell．Themainworkispresentedasfollows：(1)Accordingtothedifferentcharacteristicsunderdifferentoperating
5、modes(stand—alonemodeandgrid—connectedmode)ofmicrogrid，thedifferenceinconfiguretheMGofthetwomodesisdiscussed．Andthesolutionideasofoptimalproblemareanalysed．(2)Themodesofmainmicrogirddevicesarebuilt．ThemethodofprobabilisticpowerflowbasedonMonteCarlosimulationinamicrogridisproposed．(3)Aimingatsta
6、nd—alonemodemicrogrid，amathematicalmodelforoptimalsizingofDGisestablished．Themodeltakesthetypes，sitesandsizesofDGasvariables，minimumoverallcostasobjectivefunctionandreliabilityindexsuchasnodevoltageandlossofenergyprobabilityasmainconstraints．Andthereliabilityindexofagenerationconfigurationschem
7、eiscalculatedbyprobabilisticpowerflow．Theparticleswarnloptimization(eso)algorithmisproposedtosolvetheoptimizationproblem．Finally，a14-nodesystemcasestudyisusedtovertifythecorrectnessandpracticalityofthemethodproposedabove．(4)Amathe
