Research On Key Techniques Of Electromagnetic Compatibility For The China Railway High-speed

ABSTRACT:So far the research on the electromagnetic compatibility of China Railway High-speed (CRH) is confined only to simple analysis, test as well as assessment of electromagnetic compatibility phenomenon both in China and abroad. Under such circumstances, a research on the overall High Speed Railway system including external complex electromagnetic environment and the comprehensive theoretical and empirical researches on the electromagnetic compatibility of CRH will produce very important meaning for the development of high speed railway. In this thesis, first of all, the introduction of a new type of electromagnetic compatibility research method-electromagnetic topology method is done, its basic idea is to divide the whole complex system into many relatively simple and independent sub-volume according to certain principle. These sub-volumes are independent except through the certain way and each sub-volume is associated through the topological diagram of system. The topological decomposition of the whole system using electromagnetic topological method make the structure more clear, which laid a very important theoretical basis for subsequent analysis. Secondly, according to the decomposition results of system electromagnetic topology, the system is divided into three parts disturbance source, coupling path and sensitive equipment. The combination method of the theoretical analysis, modeling simulation and practical test is employed in the course of research and then the theoretical calculation results, modeling simulation results and actual test results are compared in order to demonstrate the correctness and effectiveness of theoretical calculation model and simulation model.Firstly, a thorough review of High speed railway electromagnetic compatibility problem’s development history is taken in Chapter1, including its theory and applications, with regards to the characteristics of EMC discipline. The author summarizes the up-date development and the latest progress in this technology domain. In Chapter2, the basic thought and concepts of electromagnetic topology theory are introduced briefly. According to the electromagnetic topology theory, based on the structure of bullet train and the test data, the electromagnetic topology model and interaction diagram of CRH are proposed. In Chapter3, the electromagnetic disturbance source is studied. The research content is the conduction electromagnetic disturbance source model caused by train passing neutral sections, the conduction electromagnetic disturbance source model caused by pantograph-catenary offline and the propagation model of conduction electromagnetic pulse in main transformer. In Chapter4, the mechanism and propagation characteristic of the radiation electromagnetic disturbance source caused by pantograph-catenary offline is studied. The research content is that the radiation electromagnetic disturbance source caused by pantograph-catenary offline is modeled and the related propagation characteristic, including the attenuation characteristics of radio disturbance with distance and height, the propagation characteristic along the contact, the transfer function from disturbance source point to inside the train, etc. are obtained, the time domain and the frequency domain characteristics of radiation electromagnetic disturbance source caused by pantograph-catenary offline are tested. The correctness and effectiveness of simulation model is approved by comparing test results and simulation results. The time domain statistical characteristics of radiation electromagnetic disturbance source is analyzed by using Kolmogorov-Smirnov test and the probability distribution model of various parameters are obtained and the frequency domain statistical characteristics of radiation electromagnetic disturbance source are analyzed by using mathematical statistic method and the disturbance level frequency characteristic curve is obtained. The probability distribution of disturbance level at different frequency point is decided by using Kolmogorov-Smirnov test and the corresponding parameters are obtain by using the maximum likelihood estimate, finally the amplitude probability distribution(APD) of disturbance source is acquired. Chapter5gives the research on the electromagnetic disturbance propagation and coupling path under the complex electromagnetic environment including crosstalk analysis of unshielded cable and shielded cable, crosstalk experiment analysis of interconnection cable and field-line coupling characteristic analysis of shielded cable.