Work

Impedance modeling and stability analysis of AT-fed flexible traction power system for heavy haul railways

Year: 2025

Type: article

Abstract: The autotransformer (AT)-fed flexible traction power system (FTPS), integrated with energy storage (ES), supplies power to freight trains (FTs). However, the widespread deployment of power electronic converters introduces low-frequency voltage oscillations, posing significant challenges to system stability. In this paper, a sequence impedance model of the FTPS is developed, incorporating both ES converters and FT converters under various control strategies. The model achieves an accuracy error of less than 4% for FT and less than 8% for ES. Moreover, it effectively captures the dynamic interaction between ES and FT under different traction network configurations. Based on the generalized Nyquist stability criterion, the impacts of traction network operation modes, controller parameters, and the number of ES and FT units connected to the system on overall stability are thoroughly analyzed. Experimental results demonstrate that the Scott-connected transformer configuration in the fully parallel traction power supply mode offers the highest system stability.

Source: International Journal of Electrical Power & Energy Systems

DOI: 10.1016/j.ijepes.2025.111244

Authors: Guowang Yu, Minwu Chen, Haowen Guan, Yinyu Chen

Institutions: CHN Energy (China), Southwest Jiaotong University

Language: English

Topic: Railway Systems and Energy Efficiency

Subfield: Industrial and Manufacturing Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $3,920