Energy storage systems for voltage regulation: Analysis for the railway junction of Rome

The paper reports a preliminary evaluation concerning the design of a stationary storage system for voltage regulation in the railway junction of Rome. In particular the case study concerns the 3 kV dc 'Trastevere-Cesano' railway line. The constant increase in railway traffic, together with the improvement of comfort, has led to an increase of the energy required in the railway sector, causing larger voltage drops along the line. The growth of the railway traffic needs solutions to manage and analyze the capability of the railway junction. Power systems simulations of a railway junction requires high computational effort and the present work reports a methodology to simulate a railway line belonging to a complex railway junction, taking into account network equivalents.