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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xiangxuan Sun & Xiaofeng Yang & Runda Zhao & Zhenshuai Wang & Maolu Chen & Trillion Q. Zheng, 2025. "S-Transform Based Time–Frequency Evaluation of Dynamic Stray Current in Zero-Resistance Converter System," Energies, MDPI, vol. 18(7), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:7:p:1594-:d:1618455
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