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1、ABSTRACTMicrogridisasmalldistributionsystemappliedtothedistributedpowersupply,canberunwiththeexternalgrid，andcanalsoruninislandoperationwhenthefaultappearinthegrid．Microgrid，withresidentialloads，isclosetotheenduserswhoaremostforcommercialandresidentialusers，andtheelectricequipmentis
2、mostlyairconditioningandrefrigeratorsandotherhomefurnishingtypethermostatically-controlledloadwithflexibleworkingmode，thistypeloadisaconstanttemperatureheatercontrolledload，itsdrivingpoweralmostusesACasynchronousmotorcomparingtoresistiveload，hasalargerproportionandneedreactivepowere
3、xcitation．Soaftertheloadresponsecontrol，itcanbeusedasinactiveandreactivepowerreserve．Sincetheproblemofnetworklossofpowersystemisprominent，andreactivepowercompensationisaneffectivemeansinreducingthelineloss．Therefore，thispaperusesBPneuralnetworktoprocedreactivepoweroptimizationofmicr
4、ogrid，combinedwithloadresponse，inthestudyofreactivepoweroptimizationmethodoflargepowergridbasedontheMATLBA2013aenvironment．Usingthemethodofequivalentmodelingoftraditionalmicrogrid，analysisedtheP／Q，V／fanddroopcontrolstrategyofthemicropower,andalsopresentedthemaster-slave，peer-peerand
5、layeringcontrolmethodsofmicrogrid，studiedthedifferentcontrolstrategiesoftheenergystoringdeviceundergridconnectedmicrogridandislandedmicrogrid，meanscurrentandwfcontrolstrategy,andbuiltamicrogridsimulationplatformintheMATLAB／Simulinkenvironment，thesimulationresultsverifiedtherationali
6、tyandfeasibilityofthecontrolstrategy,andthevoltageandfrequencyofislandedmicrogridcouldmeetthenationalstandards．Takingtherefrigeratorasanexample，thispaperproposedakindofvariableparticipationcontrolstrategysuitableofthermostatically—controlledloads，andestablisheditsmathematicalmodel，c
7、onstructedthermostatically-controlledloadmodule，runinthemicrogridsimulationplatform．Thesimulationresultsshowedthat，improvingtheparticipationofuserswastoreducetheusercomfortfortheprice，userscouldchooseappropriateparticipationcoefficientaccordingtothecomfortrequirements．Comparingthere
8、sultswithandwithout
