Abstract：The abnormal rail potential in the DC traction power supply system has attracted more and more attention. In order to control the stray current and rail potential, the rail potential limiter over-voltage protection device (OVPD), the connection device connection device (CD) and other equipment are widely used in operating lines. The dynamic distribution of rail potential will be significantly changed with the state switching of the equipment. When establishing the equivalent circuit model of the recirculation system, not only the main line should be considered, but also the parking lot/depot and the behavior of recirculation equipment. To this end, this paper established a general model of parking lot/depot equivalent circuit and OVPD. And a DC traction power supply calculation method is proposed considering the behavior of the recirculation devices. Taking an actual subway project as a simulation example, the calculation results with the proposed algorithm are more consistent with the rail potential change process in the actual project. On this basis, the interaction between the main line and the parking lot/depot was discussed and analyzed. The results show that the setting of the unidirectional connection device (UCD) of the parking lot/depot cannot avoid the interaction between the main line and the parking lot/depot, and the direct grounding of rail in parking lot/depot is more likely to deteriorate the rail potential of the main line. Compared with the case of a blocking connection device (BCD) between the main line and parking lot/depot, the rail potential Umax and Umin in main increased by 34.46% and decreased by 33.97%, respectively.
刘炜, 杨龙, 李国玉, 李思文, 樊国桢. 计及回流系统设备行为过程的钢轨电位动态仿真[J]. 电工技术学报, 2022, 37(4): 1000-1009.
Liu Wei, Yang Long, Li Guoyu, Li Siwen, Fan Guozhen. Dynamic Simulation of Rail Potential Considering the Equipment Behavior Process of Recirculation System. Transactions of China Electrotechnical Society, 2022, 37(4): 1000-1009.
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2022, Vol. 37 
