| With the rapid development of electrified railway, electrified railway has an increasingly important meaning for national economic growing. Electromagnetic transient simulation of electrified railway traction power supply system is an important tool for analyzing power quality of electrified railway, and it has an important part in the study of the influence of electrified railway on power system. How to analyze the electromagnetic transient process of traction power supply system accurately and rapidly has become the focus of current research. In this paper, researches on electromagnetic transient simulation of electrified railway traction power supply system are presented.Firstly, the paper presented a method for electromagnetic transient simulation modeling of electric railway traction network, in which the traction network wires were considered as the main body of this models, with other electrical elements considered as serial elements or shunt elements. The independent electromagnetic transient models of main electrical components were deduced, including the model of traction line based on Bergeron model of transmission line and the models of traction transformer and autotransformer by the principle of controlled source. A calculation method of establishing electromagnetic transient node voltage equation was finished by segmenting traction wire based on the distribution of traction electrical equipment. The results indicate that this method can match the calculations of commercial simulation software in a variety of conditions, has the characteristics of establishing the whole model of traction network conveniently, adjusting the simulation parameters easily and supporting secondary development, and has important value for the study of modeling and power quality analysis of traction network.Secondly, a parallel algorithm for electromagnetic transient simulation of traction network is designed based on long transmission line decoupling algorithm, in which traction network is divided into a plurality of subsystems which were calculated independently from each other. EMU electromagnetic transient model was built in MATLAB/Simulink, and it was converted to the form of a dynamic link library, which can be invoked by C++language, using Simulink Coder toolbox. The electromagnetic transient simulation of traction network based on locomotive and network coupling was established. Considering the characteristics that calculations of network subsystem and locomotive are independent of each other, a parallel algorithm for electromagnetic transient simulation of traction network based on locomotive and network coupling was established, by assigning the network subsystems and locomotive models to different computing core to calculate. This method can reduce the simulation time and improve the simulation efficiency. The results indicate that this method can be used for large scale analysis of the electromagnetic transient of long line traction power supply system, and has important application prospect in engineering. |
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