Analysis on Electrical Characteristics of Interconnected Power Supply System of Traction Substation Group

The interconnected power supply system of traction substation group is an effective means to reduce the phase separation of electrified railway, and it is imperative to analyze its distinct electrical characteristics. Firstly, the mathematical model of group through power supply system of traction substation based on AT power supply mode is established, and the expressions of current distribution of each branch, equivalent impedance of system, voltage drop and voltage loss at train are deduced. Using actual line parameters as an example, the electrical characteristics are analyzed. The results demonstrate that the equivalent impedance of the system is significantly lower than that of the existing power supply system. The traction load is more evenly distributed among the traction stations, allowing for reduced transformer capacity requirements. Although the voltage in between two traction substations on the line is lowest, it still maintains a higher level compared to existing systems. Regenerative energy from trains effectively improves voltage loss in the traction network while achieving higher utilization rates for regenerative energy. This discussion confirms its superiority in terms of power supply capability and economy.