- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | WANG Miao, MA Wenzhong, XU Hailiang, GE Pingjuan, YANG Xiaofeng, ZHENG Qionglin. Optimal Configuration Scheme of Active Stray Current Mitigation Devices in Rail Transit[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20260062
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Active stray current mitigation devices show considerable potential for application in rail transit systems. However, the arrangement of these mitigation devices within power supply sections cannot effectively accommodate dynamic changes in stray current distribution, making it difficult to maintain effective stray current mitigation under peak current conditions during train traction or braking. Therefore, an optimal configuration strategy for these active stray current mitigation devices within power supply sections was proposed, using a DC autotransformer (DCAT)-based traction power supply system as an example. First, the rail transit traction power supply system model was established, and the suppression ratios of stray current and rail potential were derived to reveal the influence of these active devices on both stray current and rail potential distributions. Second, based on train operating characteristics, the optimal configuration principles incorporating offset enhancement, symmetric distribution, and peak response were proposed. The optimal installation positions of these active devices were determined by defining the optimized offset ratio, and the mitigation performance for stray current and rail potential in the system was compared before and after configuration optimization. Finally, the Beijing Metro Yizhuang Line was selected as a case study to validate the proposed strategy through simulations. The results show that the optimal configuration strategy significantly improves the mitigation performance without increasing the number of active devices. The error between simulation results and theoretical calculations is controlled within 3%. After configuration optimization, under traction and braking conditions, the maximum rail potential at the traction substation drops from 19.4% and 24.5% to 5.9% and 8.1%, respectively, while the maximum stray current drops from 53.1% and 66.5% to 19.7% and 26.6%, respectively, relative to the corresponding values in the conventional system.
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