Review of Stability Analysis of High-Speed Rail Traction Power Supply System

In recent years, China’s high-speed railroads are developing rapidly, and more and more power electronics devices are connected to the traction network. The Low-Frequency Oscillation (LFO) phenomenon of electrified railroads occurs frequently, which seriously affects the safe and stable operation of railroads and traffic scheduling, and causes more and more concerns. This paper takes the stability of the traction power supply system of the high-speed railway as the research object and compares the research results in this field for more than ten years, firstly, it describes the common impedance modeling methods and stability analysis criteria of the traction power supply system of high-speed railway and summarizes the factors affecting the stability of the vehicle network system and the causes of low-frequency oscillation. Finally, the methods for suppressing low-frequency oscillations are reviewed from both the network side and the vehicle side to help further suppress the phenomenon of low-frequency oscillations in high-speed rail in the future.