General Mathematical Model for Simulation of AC Traction Power Supply System and Its Application

A unified mathematical modeling for AC traction power supply system is the key to the implementation of digital simulation. Based on the model of multi-conductor transmission line, a general mathematical model suitable to traction power networks fed by different power supply modes is established. According to general transform relation among terminal electric quantities of traction substation, the general equivalent circuit suitable to traction substation connected to different winding connection modes of transformers and different phase sequences. Based on chain network structure, a general mathematical model for the simulation of AC traction power supply system is built and the method to calculate power flow is improved. On this basis, the simulation software for AC traction power supply is developed. Calculation results of actual example show the built model possesses good generality and higher simulation accuracy, so it is suitable to the simulation of traction power supply system for high-speed and heavy-haul electrified railway.