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ID:34042235
大小:2.17 MB
页数:63页
时间:2019-03-03
《电动汽车换电站储能系统微电网运行控制策略-研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、硕士学位论文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
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