Research On Electromagnetic Compatibility Of Train High-voltage Equipment

At present,the research in domestic and foreign about the high-speed EMU electromagnetic compatibility has gradually evolved from equipment level to system level or even the entire vehicle.In this paper we take train high-pressure system equipment as the research object.Firstly,train roof was studied comprehensively by electromagnetic topology method.By using electromagnetic topological maps,divide the entire complex system to be many relatively simple and independent sub-areas.At the same time,these areas are linked through topological maps,and the complex system could be transformed into a simple area for research.This method lays a very important foundation to theoretically analysis high voltage system and electromagnetic compatibility of vehicle.And then this paper based on the basic theory of electromagnetic compatibility,analyze the electromagnetic 'interference mechanism of high voltage equipment and theoretically analyze the EMI of high voltage equipment such as pantographs,traction transformers and circuit breakers.And researching on interference source modeling methods.Using commercial software to simulate and analyze the high frequency radiation of the pantograph,such as the induced current induced by the high voltage cable,and the low frequency magnetic field environment surrounding the traction transformer and the high voltage cable.The simulation results are compared with the test results of other institutions,which verified the correctness and effectiveness of the theoretical analysis simulation calculation model.The first chapter of paper introduces the research results of electromagnetic compatibility of predecessors on high-speed railways,and mainly introduces the research results on the electromagnetic compatibility of high-voltage system equipment.The second chapter mainly introduces the working principle of high voltage equipment of the train.The third chapter introduces the principle of electromagnetic compatibility,and analyzes the electromagnetic compatibility of the train in combination with the actual problems of the train roof.The fourth chapter briefly introduces the basic ideas and basic concepts of the electromagnetic topology theory.Based on the electromagnetic topology theory,establish the electromagnetic interference topology of the train roof high voltage system.The fifth chapter focuses on the electromagnetic disturbance sources of high-speed EMUs,and analyzes their high-frequency electromagnetic interference,low-frequency electromagnetic interference,and interference in transmission lines.In addition,the source model of electromagnetic disturbance of pantograph arc was established.The high voltage cable coupling current characteristics when is was exposed to EMP radiation.Modeling low frequency interference sources of traction transformer and high voltage cable and high-voltage system lightning response model.Using CST software to simulate different types of electromagnetic interference.At the same time,due to the lack of test conditions,the simulation results are compared with existing actual measurement results to verify the feasibility of the simulation method.In the sixth chapter,accomplished the field-circuit co-simulation when the train is disturbed by lightning,the cable inductive current in the car,the over-voltage of the vehicle body and the shielding effect of the vehicle body.