城市轨道交通直流自耦变压器牵引供电系统故障保护研究

doi:10.19595/j.cnki.1000-6753 tces.210880

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Abstract

DC auto-transformer (DCAT) traction power supply system has a promising application prospect in urban rail transit because of the rail potential and stray current mitigation. However, the traditional DCAT may lack the sufficient fault protection capability, when DC traction power supply network short circuit or device failure of DCATs. DC-link capacitors and resonant capacitor of DCAT may discharge rapidly through the fault, which leads to the device damage of DCAT and fault pervasion. Therefore, the fault protection DC auto-transformer (FP-DCAT) is proposed in this paper. With the research on topology and control of FP-DCAT, the fault protection schemes of FP-DCAT system for typical faults are studied in detail. FP-DCAT system may operate normally after fault protection, but the rail potential and stray current of system may increase due to the removal of fault FP-DCAT. Thus the effects of fault protection on the rail potential and stray current are analyzed. Finally, the simulation results show that FP-DCAT system achieves fault protection effectively, and the variation of rail potential and stray current due to fault protection is consistent with the theoretical analysis, which ensures the high safety and reliability of FP-DCAT system applied to urban rail transit.

Key words： Urban rail transit DC auto-transformer fault protection rail potential stray current

Received: 16 June 2021

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TM46

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	Wang Miao
	Yang Xiaofeng
	Li Shixiang
	Ni Menghan
	Trillion Q. Zheng

Cite this article:

Wang Miao,Yang Xiaofeng,Li Shixiang等. Fault Protection of DC Auto-Transformer Traction Power Supply System for Urban Rail Transit[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 976-989.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753 tces.210880 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I4/976

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