不等容量vx接线牵引变压器负荷过程分析与补偿方案分析

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1、西南交通大学硕士研究生学位论文第1I页AbstractTheloadconditionofthetractiontransformersecondarysidewindingandthepowerqualityofsubstationisanalyzedusingmeasureddataofTheDragonPalacetractionsubstationwhichemploysVxtractiontransformersofdifferentcapacity．Simultaneously，onthebasisofthetractio

2、ntransformertemperatureriseandlossoflifecomputationalmodel，maximttmtemperatureofthefourwindingsofthetractiontransformersecondarysideanddaysoflifelostandanalysisVxtractiontransformersecondary-sidewindingoverloadcapacityiscalculated．SeriousoverloadsituationoftheFNwindinga

3、ndnegative-sequenceproblemofthree-phaselateralisfound．AgainsttheseriousoverloadsituationoftheVxtractiontransformersecondarySideFNwindingseriousproblemofthree-phasesideofthenegativesequence，theprogramofreplacingVxtractiontransformerisputforward，anddirectpowersupplyscheme

4、ofintroducingthedualwindingsinparallelofW+晰mstrengthenlineisproposed，aswellasthebalancecompensationscheme．Adetailedanalysisofthebalancecompensationprogramiscarriedout，andabasedSmileVarGenerator(SVG)tractiontransformerbalancedcompensationdeviceisanalyzed．Itisshownthatthe

5、balancecompensationdeviceiscapableofactivepowertransferfromphaseinTNwindingtotheFNwinding，andCansolvetheF-Nwindingoverloadproblem，whileitisalsousedtobalancethetractiononbothsidesofthesidepowerandcompensatethereactivecomponentofbothsides．Finally，thepurposeoftheeliminatio

6、nofthenegativesequencecomponentofthethree-phasesideisachieved．In-phasecompensationpackageandinter-phasecompensationprincipleisproposedforsolvingtheoverloadproblemanddealing、崩Ⅱ1thenegative—sequence．Temperatureriseandthelifelossconditionofeachwindingisanalyzedafterthein-p

7、hasecompensationgoalisdeterminedbasedontheinstalledcapacityofsecondarywinding．CalculationofVxtractionsubstationnegativesequencecurrentisdiscussed．Changingthree-phasecurrenttothree-phasesymmetrycurrentisadoptedasthetargetofcompensation．AccordingtotheSVGstructureandcontro

8、lprinciple，themechanismofin-phasecompensationpackageandinter-phasecompensationprincipleisanalyzed，andacompensa