Abstract
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.
Highlights
Railway systems have emerged as a key means of transportation since the nineteenth century
The main purpose of this study is to analyze the behavior of rail potential and stray current in the medium voltage direct current (MVDC) railway electrification environment
The results reveal that the rail potential and stray current change drastically with changing locations of the moving train
Summary
Railway systems have emerged as a key means of transportation since the nineteenth century. Inspired by the applications of high voltage direct current (HVDC) technology in conventional power transmission systems in recent history, some scholars have proposed the idea of medium voltage direct current (MVDC) railway electrification system (RES) for long-distance high-speed railways (HSRs). According to the aforementioned discussion, there is of vital importance to quantify the rail potential and stray current in the MVDC-RES In this regard, the proposed work presents a detailed analysis of rail potential and stray current in the MVDC-RES with different lengths of the traction lines, load scenarios, and grounding schemes. The main features of this paper include: (1) MVDC-RES environment, (2) rail potential and stray current under different grounding schemes, (3) proposed simulation platform for the analysis of rail potential and stray current, and (4) simulations for identifying safe operation distances between adjacent TSSs in MVDC railways
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