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±800kV换流变压器阀侧绕组屏线电场的计算分析.docx

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±800kV换流变压器阀侧绕组屏线电场的计算分析 Introduction Withtherapiddevelopmentofpowersystemandtheincreasingdemandforenergy,highvoltagedirectcurrenttransmissiontechnologyhasbeenwidelyappliedinthetransmissionanddistributionoflarge-scalepower.Inhighvoltagedirectcurrenttransmissionsystems,theconvertertransformerplaysanimportantroleasthekeyequipmentinpowertransmissionandtransformation.ItistypicallyusedtoconverthighvoltageACpowerintolowvoltageDCpowerorviceversa.The±800kVconvertertransformerisanimportantpartoftheHVDCtransmissionsystem,andinthispaper,wewillanalyzetheelectricfieldofthevalve-sidewindingpanellineof±800kVconvertertransformer. MainBody Theelectricfielddistributionofthevalve-sidewindingpanellineof±800kVconvertertransformerisaffectedbyaseriesoffactors,suchastheparametersofthetransformer,theinsulationstructureofthetransformer,andtheoperatingconditionsofthetransformer.Theelectricfieldwillalsobeinfluencedbytheunevennessoftheelectricfieldintheinsulationstructure.Therefore,itisnecessarytoanalyzetheelectricfieldofthevalve-sidewindingpanellineof±800kVconvertertransformer. Whenanalyzingtheelectricfieldofthevalve-sidewindingpanellineofthe±800kVconvertertransformer,wemustfirstdeterminethepotentialdistributionofthewinding,thecapacitancedistribution,andtheelectricfielddistribution.WecanobtainthepotentialdistributionbysolvingtheLaplaceequationwiththeboundaryconditionsofthewindingsurfaceandthevoltageofthewindingend.Then,bysolvingthecapacitancematrixandapplyingtheKirchhoff'slaw,wecanobtainthecapacitancedistribution.Finally,wecanobtaintheelectricfielddistributionbycombiningthepotentialdistributionandcapacitancedistribution. Tocalculatetheelectricfieldofthevalve-sidewindingpanellineof±800kVconvertertransformer,wecanusethefiniteelementmethod(FEM)toanalyzetheelectricfieldofthevalve-sidewindingpanelline.FEMisawidelyusedmethodforsolvingcomplexboundaryvalueproblems.Itcanbeusedtosolvepartialdifferentialequationsbydividingtheregionintosmallerandsimplersubregions,whichcanbeeasilysolved. UsingFEM,wecanobta