新型自耦感应谐波屏蔽电力变压器的通用模型及谐波模型_英文_李勇.doc
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第 35 卷 第 11 期 Vol.35 No.11 2011 年 6 月 10 日 , June102011
GeneralModelandHarmonicModelforaKindofNewAuto-inductiveandHarmonic-suppressingTransformer
LIYong1,2,LUOLongfu1,ChristianREHTANZ2,YANGDechang2,LIUFusheng1
(1.ColegeofElectricalandInformationEngineering,Changsha410082,China;2.InstituteofPowerSystemsandPowerEconomics,TUDortmund,Dortmund44227,Germany)
Abstract:Accordingtothedemandofharmonicsuppressionandreactivepowercompensationforlarge-powerelectricalAC/DCpowerconvertersystems,thispaperpresentsakindofnewauto-inductiveandharmonic-suppression(AIHS)transformerandacorrespondinginductivefilteringtechnology.Thegeneralmodelandharmonicmodelconstructedbythetransformerwindingsandtheful-tunedcircuitatthespecificharmonicfrequenciesareproposed,andtheharmonicequivalentcircuitmodelisestablished.Basedonthis,thefilteringmechanismofthenewinductivefilteringtechnologyisrevealed,andthenecessaryimpedanceconditionforthenewtransformerandthetunedconditionfortheful-tunedcircuittosuppressthemainharmoniccurrentsinthesecondarywindingsareobtained.Theanalyticalmethodofthesensitivityfunctionisappliedtoanalyzetheinfluenceoftheimpedanceparametersontheinductivefilteringeffect.Finaly,thetestresultsverifythecorrectnessoftheoreticalanalysis,andpresentthegoodinductivefilteringperformancethatthenewtransformerhas.
Keywords:harmonicsuppression;transformer;equivalentcircuit;inductivefiltering;sensitivityanalysis;harmonicmodel
0 Introduction
Withthewideapplicationofthelarge-powerAC/DCconvertersinthetransmissionanddistributionfields,the
problemoftheharmonicpolutionbecomesworseandworse[1].Generaly,thesolutiontothisproblemisshuntpassivefilter(PF)attheACgridside,whichcanprevent
themainharmoniccurrentsflowingintothepublicsupplynetworktoacertainextent[2].However,becauseofthe
fluctuationoftheelectricalload,especialyforthepowergridcontainingthehigh-voltagedirectcurrent(HVDC)systems,theflexibleregulationoftheHVDCsystemonthepowersystemmaycausetheharmonicinstability
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