MRTS traction power supply system simulation using Matlab/Simulink

Computer simulation of traction power supply system of modern mass rapid transit systems (MRTS) is not just an ordinary DC power supply system solution that applies power flow algorithms or an ATO (automatic train operation) simulation that concerns the single train operation strategy. It is necessary to combine the moving trains´ characteristics with those of the DC (and then the AC) network in the computational process. This paper describes the work of simulating the integrated DC rapid transit traction power supply system based on multiple train movement using Matlab/Simulink. The multiple train movement is established by using blocked diagram models with Simulink, a companion program to Matlab, which is an interactive system for simulating nonlinear dynamic systems. The connection and dynamic data shared between Simulink and Matlab program, are satisfactory to achieve the complete integration between multiple train movement simulation and the consecutive dynamic DC power network solution as a whole dynamic process. It makes the computational process more satisfactory. With 3 dimensional graphs, the calculated results are more realistic to express the system features, including both the electric features and the physical profiles. The solution process provides a better approach to analyze the characteristics of the traction power supply system and can lead to better operation organization.