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基于EAST超导纵场线圈的换流分析.docx

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基于EAST超导纵场线圈的换流分析 Introduction: TheEAST(ExperimentalAdvancedSuperconductingTokamak)isalarge-scaleexperimentalfusiondevice,whichisusedtostudytheconfinementandheatingofhigh-temperatureplasma.Thedeviceusesasuperconductingmagnetsystem,whichincludesasetofEASTsuperconductingverticalfieldcoils(EASTVFCs),EASTpoloidalfieldcoils(EASTPFCs),andEASTtoroidalfieldcoils(EASTTFCs).TheEASTVFCsareessentialcomponentsoftheEASTmagnetsystem,whichgeneratethepoloidalmagneticfieldrequiredforplasmaconfinement. TheEASTVFCsarebuiltusinghigh-temperaturesuperconducting(HTS)technology,whichprovidesseveraladvantagesovertraditionallow-temperaturesuperconducting(LTS)materials.HTSmaterialshaveahighercriticalcurrentdensityandoperateathighertemperatures,whichreducescoolingrequirementsandincreasesreliability.TheEASTVFCsarecomposedofseverallayersofHTStapeswoundaroundastainless-steelform.Thetapesarecooledtoatemperatureof4Kusingaliquidheliumrefrigerationsystem. TheEASTVFCsarearrangedintwosetsofsixcoilseach,whicharepositionedsymmetricallyaroundthetorus.Eachcoilinthesetiswoundinanoppositesense,whichproducesanetpoloidalfieldwhenthecoilsareenergized.TheVFCsaredesignedtooperateinapulsedmode,withamaximumcurrentof11kAandamaximummagneticfieldof5T. RectificationAnalysis: TheoperationoftheEASTVFCsrequiresareliablerectificationsystem,whichconvertstheACpowersuppliedtothecoilsintoDC.TherectificationsystemmustbeabletohandlethehighcurrentandvoltagelevelsrequiredbytheVFCs,aswellasprovideastableoutputvoltageandcontroltherisetimeofthecurrent.Therectificationsystemiscomposedofseveralcomponents,includingthetransformer,diodes,andcapacitorbank. ThetransformerintherectificationsystemisusedtostepupthevoltageoftheACpowersuppliedtotheVFCs,whichreducesthecurrentrequiredtoachievetherequiredmagneticfield.ThediodesareusedtoconverttheACpowerintoDC,andthecapacitorbankisusedtosmoothouttheoutputvoltageandregulatetherisetimeofthecurrent. Therectificationsystemmustbedesignedtooperatewithhighefficiency,asanylossofpowerwillresultinincreasedcool