Optimization Research On EMC Modeling And Simulation Of Subway Converter

Entering the new era,the eight vertical and eight horizontal world’s strongest high-speed rail network is stretching in the motherland.The rapid development of the rail transit industry has promoted the continuous advancement of railway electrification technology.Various types of new electrical equipment are increasingly used in the field of rail transit,which makes the electromagnetic compatibility(EMC)problem in the rail electrical system more serious.The traction converter is an indispensable important energy conversion unit in the traction system of train vehicles.The EMC performance of the converter becomes a key factor for the stable and efficient operation of the entire train traction system.Therefore,the research on converter EMC is an important prerequisite for ensuring the stable operation of the train system.Combining with various domestic and foreign literature and the latest research status of converter EMC,which have further understanding of converter EMC research and reliable operation of the entire train system and a more comprehensive understanding of converter EMC simulation modeling optimization.Based on the converter of the subway train traction system and the related simulation software,the EMC simulation optimization analysis of the converter is carried out.Firstly,the current status of simulation research on EMC characteristics of converters at home and abroad is summarized.The research status of converter electromagnetic interference(EMI)modeling and simulation and EMI suppression technology is emphatically analyzed.The interference sources and interference paths of conducted and radiated EMI are analyzed according to the structure of the converter system.The comparison of switching transient and complex models and simulation methods for high-voltage and high-power IGBT modules are carried out to obtain an efficient and complex model processing and simulation method.Secondly,through the internal circuit principle and system structure analysis of the converter.The crosstalk between the internal power cable harness of the inverter circuit converter composed of the power module and the high voltage and high power IGBT module of the main components of the converter are simulated and detailed analysis is made.The shielding characteristics and shielding effectiveness of the converter cabinet are simulated and compared according to the definitions of active and passive shielding and dynamic shielding.The shielding effectiveness at different positions of the converter are analyzed.The shielding effectiveness rating of the converter cabinet is rated and estimated with reference to electromagnetic compatibility related standards.Finally,with reference to the external radiation related test standards of the converter,the external radiation of the converter is analyzed before and after loading.Based on the relevant test results,it is determined that the main frequency band of the external radiation of the converter is built before the external radiation simulation model of the converter.The actual simulation model is compared with the optimized simulation model.Comparing the simulation results with the measured data,the efficiency and correctness of the optimized simulation model are verified.The electric field distribution magnetic field distribution and far field radiation distribution at several frequency points of the converter in the main radiation frequency band are analyzed and compared.It provides a reference for the subsequent simulation and design of converter EMC.