Electro-mechanical modelling and simulation of 2×25 kV railway systems

The $2 \times 25$ kV railway systems are multi-engineering systems which involve many simulation issues. They require appropriate modelling and simulation tools to solve these issues and accurately reflect characteristic changes during system operation. This paper analyses the AC railway systems characteristics and several hypotheses that are proposed to simplify these simulation issues. After that, the systems simulation models are built by utilisation of two different cyber-physical modelling and simulation tools: Modelica and Matlab-Simscape. The respective characteristics of these two tools are compared in this paper as well. The results show that the two different tools have the nearly equivalent accuracy, and Modelica is more flexible and easier to use.