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As the scale of urban railway transit is continuously enlarging, the issue of energy consumption has grown increasingly conspicuous. Installing hybrid energy storage systems in traction substations gives the energy recovery device the ability to possess both high power density and high energy density. Because the no-load voltage of the substation in the urban railway distributed power supply system is different and often fluctuates. If the energy management strategy of the energy storage system is improper, and the unfavorable situation of energy circulation between the substation and the energy storage and between the multiple energy storages will occur. In this paper, each part of the traction power supply system with stationary hybrid energy storage system is modeled first, and then three operating conditions based on different no-load voltages are analyzed. By increasing the charging threshold, some operating conditions can be avoided, but at the same time, the dynamic resistance is easier to start, so a control strategy needs to be proposed to solve this problem in the future.

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Research on Coordinated Control of Multiple Energy Storage Systems Considering No-Load Voltage Differences

  • 会议论文

  • 发表日期：

    2025年

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  • Shi Xiao,
  • Jingwen Zheng,
  • Luqing Jiang,
  • Yajie Zhao,
  • Bin Li,
  • Zhihong Zhong,
  • Hu Sun

摘要

As the scale of urban railway transit is continuously enlarging, the issue of energy consumption has grown increasingly conspicuous. Installing hybrid energy storage systems in traction substations gives the energy recovery device the ability to possess both high power density and high energy density. Because the no-load voltage of the substation in the urban railway distributed power supply system is different and often fluctuates. If the energy management strategy of the energy storage system is improper, and the unfavorable situation of energy circulation between the substation and the energy storage and between the multiple energy storages will occur. In this paper, each part of the traction power supply system with stationary hybrid energy storage system is modeled first, and then three operating conditions based on different no-load voltages are analyzed. By increasing the charging threshold, some operating conditions can be avoided, but at the same time, the dynamic resistance is easier to start, so a control strategy needs to be proposed to solve this problem in the future.