In contrast to the conventional direct current railway electrification system (DC-RES), the medium voltage direct current (MVDC)-RES is considered promising for long-distance high-speed corridors. In the MVDC-RES, traction substations (TSSs) are placed much farther and train loads are much heavier than in the conventional DC-RES. Hence, the MVDC-RES brings a drastic change in catenary voltage, TSS spacing, and train loading, which affects rail potential and stray current. In this connection, this work performs some significant quantitative analysis of rail potential and stray current in the MVDC-RES environment. An MVDC simulation model is proposed and different grounding schemes are analyzed for a single-train and two TSSs scenario as well as for a multi-train multi-TSS scenario. According to the simulation and analysis, the maximum values of rail potential and stray current at MVDC-RES distances and the maximum safe distance between adjacent TSSs are determined.

与传统的直流铁路电气化系统 (DC-RES) 相比，中压直流 (MVDC)-RES 被认为有希望用于长距离高速走廊。在 MVDC-RES 中，牵引变电站 (TSS) 放置得更远，列车负载比传统 DC-RES 中的要重得多。因此，MVDC-RES 使接触网电压、TSS 间距和列车负载发生剧烈变化，从而影响轨道电位和杂散电流。在这方面，这项工作对 MVDC-RES 环境中的轨道电位和杂散电流进行了一些重要的定量分析。提出了 MVDC 仿真模型，并针对单列和两个 TSS 场景以及多列多 TSS 场景分析了不同的接地方案。根据模拟和分析，