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Current Balancing Strategy for Urban Rail Bidirectional Converters Based on Modified Voltage Command
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Yong WANG1, Duo YANG2, Chunmin SHI1, Peilin LU1, Jingpeng ZHANG3, Zhihong ZHONG3, Zhongping YANG3
Urban Rapid Rail Transit | 2025, 38(3) : 138 - 145
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Urban Rapid Rail Transit | 2025, 38(3): 138-145
• Electrical and Mechanical Engineering •
Current Balancing Strategy for Urban Rail Bidirectional Converters Based on Modified Voltage Command
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Yong WANG1, Duo YANG2, Chunmin SHI1, Peilin LU1, Jingpeng ZHANG3, Zhihong ZHONG3, Zhongping YANG3
Affiliations
  • 1 Standards and Metrology Research Institute China Academy of Railway Sciences Co., Ltd. Beijing 100081
  • 2 National Railway Testing Center Beijing 100081
  • 3 School of Electrical Engineering Beijing Jiaotong University Beijing 100044
Published: 2025-06-01 doi: 10.3969/j.issn.1672-6073.2025.03.019
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Bidirectional substations have advantages in regenerative braking energy utilization of urban rail transit because of their controllable output voltage, capability of unity power factor operation, and bidirectional energy flow. Due to voltage sensor errors and line parameter inconsistencies, the two converters in the substation generate significant unbalanced currents. While increasing the converter output current feedback coefficient can reduce the current difference between converters, it consequently intensifies the output voltage fluctuations of the substation. On the basis of droop control strategy based on converter output current feedback, a droop control strategy based on substation output current compensating voltage command value is proposed by adding a voltage compensation term proportional to substation output current. The results show that this strategy can improve the current balance between converters and reduce the fluctuation degree of substation output voltage. Finally, the simulation model is built in MATLAB/Simulink, and the example analysis is carried out to verify the effectiveness of the proposed strategy.

bi-directional converter  /  urban rail transit  /  bi-directional substation  /  droop control strategy
Yong WANG, Duo YANG, Chunmin SHI, Peilin LU, Jingpeng ZHANG, Zhihong ZHONG, Zhongping YANG. Current Balancing Strategy for Urban Rail Bidirectional Converters Based on Modified Voltage Command[J]. Urban Rapid Rail Transit, 2025 , 38 (3) : 138 -145 . DOI: 10.3969/j.issn.1672-6073.2025.03.019
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Year 2025 volume 38 Issue 3
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Article Info
doi: 10.3969/j.issn.1672-6073.2025.03.019
  • Receive Date：2024-06-25
  • Online Date：2025-07-09
  • Published：2025-06-01
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  • Received：2024-06-25
  • Revised：2025-03-04
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Affiliations
    1 Standards and Metrology Research Institute China Academy of Railway Sciences Co., Ltd. Beijing 100081
    2 National Railway Testing Center Beijing 100081
    3 School of Electrical Engineering Beijing Jiaotong University Beijing 100044
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