Research on the Influencing Factors of Subway Traction Reflux Distribution with AC Power Supply System

The outstanding advantages of single-phase AC traction power supply subway with power frequency make it put into operation more and more.CDEGS simulation software was used to simulate, HIFREQ module was used to build a subway tunnel reflux system model under single-phase power frequency AC power supply system, and after a series of assumptions and optimization, current was injected on the basis of direct power supply methods of bringing back streamline and overhead contact line, and the current in each reflux path was observed and its distribution ratio was obtained. The effect of train running position on return distribution ratio is discussed. The influence of the main site, soil resistivity and ground resistance on the distribution of traction reflux is discussed. The linear relationship is found. The farther the main site is from the line, the larger the proportion of ground reflux is, and the smaller the proportion of rail reflux is. Conversely, the larger the soil resistivity, the larger the rail reflux ratio, the smaller the ground reflux ratio. In addition, the greater the grounding resistance, the smaller the ground reflux.