含微网的配电系统电压暂降分析与控制

含微网的配电系统电压暂降分析与控制

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时间:2019-03-03

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1、万方数据华北电力大学硕士学位论文AbstractChinahasthevastterritoryandabundantresources,butthedistributionofresourcesisextremelyunbalanced.Itisanefficientandenvironment-friendlywaytobuildpowerplantnearbypitandtransporttheenergyfromplanttoloadcenterthroughtheultrahighvolta

2、ge(uav)transmissionline.Butthewind,solarandbiomassenergycanbetransportedthroughlong·-distanceandlarge··scalewayinlimitedplaces.Somostrenewableenergyisdevelopedandutilizedinadistributedway.Differenttypesofcomplementaryenergyformacommonmicro—networkandthe

3、primaryenergycanbeconvertedthroughvarietyofdevicestosecondenergy,whicheffectivelyimprovestheefficiencyoftheutilizationofprimaryenergy.Atthesametimetheenergystorageisaddedintomicro·grid,whichcanbeusedtosmooththepowerfluctuationsandensurethevoltageandfreq

4、uencystabilityandbalanceofgenerationandload.Micro—gridbringsconveniencetoourlife,butitcontainsalargenumberofpowerelectronicconversiondevices,whichneedhigherpowerqualityandrequirements.Voltagesagmayleadtoabnormaloperationofpowerelectronicdevices,whichmay

5、causethecollapseofmicro—girdandusersmaysufferhugeeconomiclosses.Sothestudyofvoltagesagofdistributionsystemcontainingmicro-gridhasimportantsignificanceanditcanimprovethepowerqualityofmicro—gridanddistributionsystem.Inthispaper,thestructure,keytechnologya

6、ndmainmicrosourcesofthemicro-gridarestudied.Thesimulationmodelofdistributionsystemwithmicro-gridiSestablishedontheplatformofPSCADsoftwareandthemechanismofvoltagesaginthedistributionwithmicro—gridisanalyzed.Accordingtothecharacteristicsofmicro·gridandmic

7、ro-sources,avoltagedynamiccompensatorsuitablefordistributionsystemwithmicro-gridshasbeenputforward,whichcoordinatelycontrolsthePVunitandcelltoprovideenergyforDVR.FinallythecompensationeffectofDVRisverifiedthroughthesimulation.TheresultsshowthattheDVRcan

8、beappliedindistributionsystemwithmicro.gridsduringnormalrunninganditcaneffectivelyimprovethepowerqualityofdistributionsystemwithmicro·grids.Keywords:Micro-grid,powerquality,voltagesagII万方数据华北电力大学硕士学位论文目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

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