牵引变流器电磁兼容技术研究

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1、西南交通大学硕士学位论文牵引变流器电磁兼容技术研究姓名：陈郭霞申请学位级别：硕士专业：电力电子与电力传动指导教师：关振宏20080501西南交通大学硕士研究生学位论文第1

2、页AbstractElectromagneticpoHufiongeneratedbyelectricallocomotiveontheenvironmenthasbeenattachedgreatattentionbyRoilingStockManufacturinghdustryathomeandabroad．Tractionconverteriso

3、neof$evereelectromagneticinterference(EMI)SOUl"CCS．Soresearchofelectromag·neticcompatibility(EMC)strategyintractionconverterisespeciallyimportant．ThisthesisfocusesonEMIgenerationandpropagationmechanisms，causeandspreadrouteofconductedEMI,halmofcommonmode(CM)EMIandm

4、odulationstrategytOreducecommonmodeEMIintractionconvel'teLTheEMIoftractionconverterisclassified鹊conductionEMIandradiatingEMI．Themaininterfbrenc圮isconduaionEMIinthetwointerferences．TheCOnduetionEMIisclassifiedascommonmodeEMIanddifferentialmode(DM)EMI．DifferentialEM

5、IisduetotheripplecurrentfromthefastswitchandcomlnonmodeEMIisduetothedv／dtcharginganddischargingtheparasiticcapacitor．CommonmodeEMIismaininterferenceinconductionEMI．CMvoltageandCMcurrentwillleadtogeneratebearingvoltageandbeatingcurrentintractionmotor．Otherearthconn

6、ectiondeviceswillalsobeinterferedbythem．Inordertodecreasetheharmofcorn-monmodeEMI，thedissertationfirstlyanalysedthestructureandcontrolstrategyoftractionconverter．AnddescribedthecauseofEMIgeneratedbytractionconverter，mainspreadrouteandsuppressionmeasureofEMI．Thenth

7、egenerationandpropagationmechanismsofconductionEMIandtheEMIcausedbymodulationstrategywereanalysedindetail．Newmodulationtech-nologiesaleproposedtoreducecommonmodeEMIofPWMinverter．BasingonthetraditionalSVPWM，thenewmodulationtechnologiesincludedigitalvectoractiontime

8、modulationtech-nologyandimprovedSVPWMinthree—phaseinverterwithfourbridgelegs．EfficiencyofDCvoltageandharmoniccontentofoutputcurrentwereanalysedindetailOilthenewmodulationtechnologies．SimulationwasmadeonthetwonewmodulationtechnologiesbyuseofMaflab／Simulink，Thesimul

9、ationresultshowsthatimprovedSVPWMinthree—phaseinverterwithfourbridgelegscallattenuationcommonmodeinterferenceeffectivelywithoutchangingefficiencyofDCvol