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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．To
2、acertainextent，theproposionofthemicrogridconceptalleviatestheproblemsbroughtaboutbythepowergridexpansion．Asaneffectivecomplementoflargepowergrids，themicrogridplaysanimportantroleinimprovingthereliabilityofpowersupply，implementingtheadvantagesofdistributedgenerations
3、andpromotingthrperformanceofthegrids，whichhasbecomeoneofthemaindirectionsofthedevelopmentofpowersystem．Andproperconfigurationofmictogeneration’Stype，locationandsizewhichmakesthesystemoperatesafelyandeconomically,iSanimportantproblemthatmustbesolvedwithmicrogrid’Sdev
4、eloping．Consideringthecharacteristicsofmicrogrid，theoptimalsitingandsizingofmicrogenerations(MG)inamicrogridisstudiedinthispaper．Theoverallsystem’Sreliabilityandeconomyisconsidered．Andstochasticnatureofthemicrogrid，suchastherandomnessnatureofwindandsolarenergy，istak
5、enintoaccountaswell．Themainworkispresentedasfollows：(1)Accordingtothedifferentcharacteristicsunderdifferentoperatingmodes(stand—alonemodeandgrid—connectedmode)ofmicrogrid，thedifferenceinconfiguretheMGofthetwomodesisdiscussed．Andthesolutionideasofoptimalproblemareana
6、lysed．(2)Themodesofmainmicrogirddevicesarebuilt．ThemethodofprobabilisticpowerflowbasedonMonteCarlosimulationinamicrogridisproposed．(3)Aimingatstand—alonemodemicrogrid，amathematicalmodelforoptimalsizingofDGisestablished．Themodeltakesthetypes，sitesandsizesofDGasvariab
7、les，minimumoverallcostasobjectivefunctionandreliabilityindexsuchasnodevoltageandlossofenergyprobabilityasmainconstraints．Andthereliabilityindexofagenerationconfigurationschemeiscalculatedbyprobabilisticpowerflow．Theparticleswarnloptimization(eso)algorithmisproposedt
8、osolvetheoptimizationproblem．Finally，a14-nodesystemcasestudyisusedtovertifythecorrectnessandpracticalityofthemethodproposedabove．(4)Amathe
