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Analysis of Rail Potential with the Influence of Multi-node Power Distribution in Urban Rail Power Supply System

At present, abnormal rise of rail potential in DC traction power supply system of urban rail transit has become a difficult problem in line safety. The mechanism and distribution of abnormal rail potential need to be clarified. In the traditional analysis method, the mode that single train operating in single power supply section is far from the mode that multitrain run in multi-power supply sections in the actual line. The power allocation of multitrain and traction substations is complex, which will affect the rail potential. In this paper, the parallel multiconductor model of traction power supply system under multitrain parallel operation is established. A new power distribution calculation method for urban rail power supply system is analyzed. Dynamic simulation of the system is carried out based on the parameters of actual line, and the effect of power allocation on rail potential is analyzed. Results show that, rail potential is greatly affected by the power allocation of the system. Optimizing the power distribution of the system can effectively control the abnormal increase of rail potential.