Compatibility of Present 3 kV DC and 2x25 kV AC High-Speed Railway Power Supply Systems Towards Future MVDC System

In recent years, due to the limitations and disadvantages of conventional DC and AC railway power supply systems (RPSS) the idea of reinforcing and replacing these systems with a more advanced and developed MVDC based system has become more prominent. The high power capability of these alternative systems together with convenient integration of distributed energy resources are the outstanding features which highlight their potential. In this paper, the adaptability of current Italian high-speed RPSS including 3 kV DC and 2x25 kV AC with new MVDC RPSS in terms of the configuration of traction power substations (TPSS), OCS structures, voltage drops, and rolling stocks has been addressed and interface power electronic-based converters are suggested.