Railway traffic and energy calculations
Résumé
A specific simulation tool has been developed in order to design 50Hz/60Hz 25 kV or 2x25 kV (autotransformers system) AC lines. Its architecture and principles are detailed. Mechanical, electrical and thermic computations are run separately, and some specific features were added to the tool for energy calculations. In the first part, sensitivity studies for AC railway electrical network simulation are presented. The considered parameters are the soil resistivity and the high voltage power network impedance. The effects of regenerative braking are also studied. The aim of this exercise is to determine the influence of these parameters on the output results of the electrical module. In the second part, the relation between electrification and mechanical calculations is studied in order to determine the influence of the electrification quality level on the trains operation. Delays are quantified, including the case when regenerative braking is taken into account. A progressive approach is chosen, showing basic, theoretical examples. In a second step, a real example is presented to show the influence of these parameters on energy consumption. All the studies presented in this paper were run for the 1x25 KV single supply case, but this exercise may be extended to the 2x25KV (Autotransformers) system