In order to solve the problem that the metro stray current cannot be directly numerically measured by the existing methods, and the data acquisition distortion caused by the special operating environment of the metro system, a new on‐line monitoring method for stray current was put forward in this paper. First, the stray current distribution function at different positions of metro trains was derived. Then, the equivalent circuit of stray current was built according to the field measured environment, and the numerical calculation formula of stray current was deduced. On the basis of the formula, the metro stray current could be calculated by the real‐time monitoring data, and the calculated data can be filtered and fitted with the stray current distribution function. In order to identify the distorted data, the potential energy function was introduced to judge the deviation degree of data point from the fitting function, so the erroneous data can be effectively eliminated. Thus, the accurate distribution value of stray current along the metro track was obtained. Taking a metro station in a certain city as the prototype, the CDEGS simulation model was built to verify the proposed method. The simulation results showed that even under the condition of sampling data distortion, the method could directly calculate the stray current value in real time, which had strong fault tolerance. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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直流地铁系统杂散电流在线监测的新方法

为了解决现有方法无法直接对地铁杂散电流进行数值测量，以及地铁系统特殊运行环境导致数据采集失真的问题，提出了一种新的在线监测杂散电流的方法。在本文中。首先，推导了地铁列车不同位置的杂散电流分布函数。然后，根据现场测量环境，建立了杂散电流的等效电路，推导了杂散电流的数值计算公式。根据该公式，可以通过实时监测数据计算出地铁杂散电流，并且可以对计算出的数据进行滤波并拟合杂散电流分布函数。为了识别失真的数据，通过引入势能函数来判断数据点与拟合函数的偏离程度，从而可以有效地消除错误数据。因此，获得了沿着地铁轨道的杂散电流的准确分布值。以某城市的地铁站为原型，建立了CDEGS仿真模型以验证该方法。仿真结果表明，即使在采样数据失真的情况下，该方法也可以直接直接实时计算杂散电流值，具有较强的容错能力。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。得到了沿地铁轨道的杂散电流的准确分布值。以某城市的地铁站为原型，建立了CDEGS仿真模型以验证该方法。仿真结果表明，即使在采样数据失真的情况下，该方法也可以直接直接实时计算杂散电流值，具有较强的容错能力。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。获得沿地铁轨道的杂散电流的准确分布值。以某城市的地铁站为原型，建立了CDEGS仿真模型以验证该方法。仿真结果表明，即使在采样数据失真的情况下，该方法也可以直接直接实时计算杂散电流值，具有较强的容错能力。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。