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ID:32218051
大小:7.97 MB
页数:58页
时间:2019-02-01
《永磁偏置型故障限流器的技术经济性优化、配置与影响分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据山东大学硕士学位论文ABSTRACTWiththecontinuousdevelopmentofinterconnectionandUHVconstructionofChinapowersystem,thegridstructurebecomesincreasinglystrong.However,itisgettingmoreandmoreseriousthatlargeshortcircuitcurrentinpowersystemsexcessestheregulationstandard.Apparently,ithasbecomeacr
2、iticalproblemtolimittheshortcircuitcurrentlevelseconomicallyandeffectively,whichisyettobesolvedintheplanning,operationandmaintenanceofpowersystems.Faultcurrentlimiters,namelyFCLs,representinganovelfaultcurrentlimitingtechnologywithgreatapplicationprospect,havebeenapopulartopicinr
3、ecentyears.AmongnumeroustypesofFCLs,faultcurrentlimiterbasedonpermanent-magnet-biasedsaturation,namelyPMFCL,possessesoutstandingperformancewithpromisingpracticalityinthehigh-voltageandlarge-capacitysituations.Threecrucialissuesofstraight-linetypePMFCLswereinvestigatedinthisdisser
4、tationforthesakeofengineeringapplicationinhigh-voltagepowergrids,includingeconomicaloptimizationanddesign,optimalallocationinlarge—scalepowergrids,andinfluenceonthetransientstabilityofpowersystems.TheapplicationvalueofFCLsoughttobemainlydominatedbyeconomy,ratherthantechnicalperfo
5、rmanceinhigh-voltageandlarge—capacitycircumstances.Basedonthreeindependentelectromagneticvariablesofinductanceratio,inductancesumandsaturationdepthratio,theeconomicalevaluationandoptimizationmodelswerebuiltastoconverttheeconomicaloptimizationanddesignofPMFCLsintotheissueofoptimal
6、combinationoftheaforementionedthreeelectromagneticvariables.Byvirtueofa500kVcaseforeconomicalanalysis,optimalcostandthecorrespondingstructureparametersofthePMFCLWascalculated.Finiteelementsimulationprovedthevalidityoftheproposedmodels.OptimalallocationofPMFCLsinlarge-scalepowergr
7、idsisavitalproblemtobesolvedbeforeengineeringapplication.Busself-impedancewasregardedasthemeasurementindexofshortcircuitlevel,andanoptimalallocationmodelofPMFCLswithconsiderationtotheoverallcurrent-limitingeffectandeconomywasbuilton万方数据山东大学硕士学位论文accountoftheincrementofbusself-imp
8、edance.Itwasproposedthatthestartingcondi
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