地铁-电网磁耦合电流在电网回路中分布特性研究*

doi:10.11985/2023.03.008

摘要/Abstract

摘要：

地铁系统对电力系统不仅存在杂散电流的威胁，其牵引供电系统与电力系统之间还存在磁耦合，会导致系统回路中出现感应电流，侵入变压器，最终造成直流偏磁问题。相对于杂散电流，因磁耦合产生的感应电流频率更低，更加难以治理与防护，并且磁耦合感应电流的幅值大小与地铁线路与变压器的相对位置有关。为深入探究地铁与电网回路磁耦合机制，探明感应电流对电网回路的影响特性，搭建地铁-电网耦合仿真模型及电网数值分析模型，计算分析电网回路磁通量及回路中感应电流的分布特性。研究结果表明，地铁对电网多回路中各个变压器的磁影响程度因并行距离、相对位置等因素存在差异；远离地铁线路的变压器受到的磁耦合影响更为严重；磁耦合电流存在通过电网回路向远处变压器传播的可能。

关键词: 磁耦合电流, 变压器, 杂散电流, 电网回路, 地铁线路

Abstract:

The metro system poses not only a threat of stray currents to the power system but also a magnetic coupling between the traction power supply system and the power system, resulting in induced currents in the system circuit, invading transformers, and ultimately causing direct current(DC) biasing issues. Compared to stray currents, the induced currents generated by magnetic coupling have lower frequencies, making them more difficult to control and protect against. Furthermore, the magnitude of the induced currents due to magnetic coupling is dependent on the relative positions of the subway lines and transformers. In order to investigate the magnetic coupling mechanism between the metro system and the power grid circuit and understand the characteristics of the induced currents on the power grid circuit, a subway-power grid coupling simulation model and a numerical analysis model for the power grid are established, and the distribution characteristics of magnetic flux and induced currents in the circuit are calculated and analyzed. The research results indicate that the extent of magnetic influence from the subway on various transformers in the power grid’s multiple circuits varies depending on factors such as parallel distance and relative positions. Transformers located further away from the subway lines are more severely affected by magnetic coupling. There is a possibility of magnetic coupling currents propagating through the power grid circuit to more distant transformers.

Key words: Magnetic coupling current, transformer, stray current, power grid circuit, subway lines

中图分类号:

U223

胡学永, 宁晓雁, 刘骁, 颜靖东. 地铁-电网磁耦合电流在电网回路中分布特性研究^*[J]. 电气工程学报, 2023, 18(3): 73-80.

HU Xueyong, NING Xiaoyan, LIU Xiao, YAN Jingdong. Metro-grid Magnetic Coupling Current in the Grid Circuit Distribution Characterization[J]. Journal of Electrical Engineering, 2023, 18(3): 73-80.

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距离/m	磁通/Wb	感应电流/A
500	0.005 259 505	1.330 496 879
1 000	0.002 192 4	0.554 611 428
1 500	0.001 152 9	0.291 649 113
2 000	0.000 642 6	0.162 558 522

关联度	实部	虚部
A#2	-0.97	0.79
B#2	-0.95	-0.87
C#3	-0.55	-0.51