含微网的配电系统电压暂降分析与控制

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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⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯