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1、碩士學位論文AbstractAlongwithextensiveuseofelectriccars，electricvehicle(EV)chargingstation，asthesourceofenergysupply，developsrapidlyinthesametime．Inordertorelievevalley-to-peakinurbandistributionnetwork，EVchargingstationneedstobeimplementedtoavoidsbringingmoreseriousloadf
2、luctuations；atthesametime，inordertopeakonthedistributionnetwork、controlflowefficient、reducelossandrelievecapacityofpressure，distributedenergystoragestationneedstobuild．Therefore，ifthedistributedEVchargingstationplaysarolenotonlyinsupplyingelectricvehiclebattery，buta
3、lsoasacontingencyreservepower，theinvestmentcostsofenergystoragewillreducesignificantlyandtheurbanlandresourceswillbesaved．EachindividualEVchargingisequaltoasmallpowergrid：itcanoperateingrid—connectedmode，andalsosupplypowertoEVindependently．Sosuchacontrolledsystemisc
4、alledmicrogrid．Asaneffectivesupplementtothegridandaneffectiveutilizationformofdistributedenergy，thedevelopmentofmicrogridhaschangedthesinglepowersupplypatternandhasgreatlyimprovedpowersupplyreliabilityandefficiency．Coreworkisconcentratedintheseareas：(1)Thispapercomb
5、inescontroldemandofthemicrogridandcharacteristicsofDG．studiesonmicrogridcontrolmethodssuchasmaster—slavecontrol、equivalentcontrolandhierarchicalcontrol，illustratestheprincipleandrightconditionsofconstantpowercontrol(PQcontr01)、droopcontrol、pourdroopcontrol、constantv
6、oltageconstantfrequencycontrol(V／fcontr01)．(2)Whenpowerstationisinislandedoperation，theinverteroutputvoltageamplitudeandfrequencyfluctuatingfollowsunstableloads．Formaintainingthestabilityofvoltageandfrequency，animproveddynamicself-adjustingdroopcontrolstrategyisprop
7、osedonthebasisofthetraditional．ThemethodconstantlyrevisesP—E&Q-fcurvelocations，maintainsthefluctuationsofvoltageamplitudeandfrequencywithinasmallthresholdunderabruptloadvariation，andmakessystemstable．Underthevariationcharacteristicsoffrequency，voltageandcurrent，thet
8、raditionalandimproveddroopcontrolstrategyareanalyzedbasedonanislandingmodeestablishedwithMatlab／Simulink．Theresultsshowthattheproposedmeth
