S-Transform Based Time–Frequency Evaluation of Dynamic Stray Current in Zero-Resistance Converter System

Xiangxuan Sun, Xiaofeng Yang (), Runda Zhao, Zhenshuai Wang, Maolu Chen and Trillion Q. Zheng
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Xiangxuan Sun: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Xiaofeng Yang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Runda Zhao: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Zhenshuai Wang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Maolu Chen: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Trillion Q. Zheng: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2025, vol. 18, issue 7, 1-16

Abstract: In DC urban rail transit, stray current causes unneglectable electrochemical corrosion to metallic structures near running rails. In view of the low-frequency and non-stationary distribution of dynamic stray current due to multiple trains in lines, its signal characteristic is significant for the corrosion degree prediction and mitigation performance evaluation. While zero-resistance converter system (ZRCS) is introduced for stray current mitigation, further evaluation of its mitigation performance is essential to field application. Considering that the Fourier transform processing non-stationary signals cannot estimate its frequency-domain features accurately, this paper introduces S-transform to extract the time–frequency characteristics of dynamic stray current in ZRCS. Moreover, the dynamic stray current mitigation performance of ZRCS is verified through time–frequency analysis results.

Keywords: urban rail transit; zero-resistance converter system (ZRCS); stray current; S-transform; time–frequency analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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