The integration of a PV system for 3 kV dc railway electrical substation: The case study of Cagliari — Oristano line

The paper describes a technical and economic analysis of photovoltaic system integration for a 3 kV dc railway line. The study has been conducted on a electrical substation (ESS) place on Cagliari - Oristano railway line. The analysis has been taken into account two different railway timetables and the size of PV system, according to electric power supplied by the ESS, has been defined in order to enhance the self-consumption, taken into account the space available near the electrical substation. Finally, an economic analysis and the possibility of providing an energy system storage to store the excess energy produced has been evaluated.