An energy storage apparatus for urban railways using a bidirectional DC to DC converter (20a, 20b, 20c) increases charge and discharge efficiency through design of a controller (32) taking into consideration operation of associated devices and increases ec...

A power quality monitoring apparatus for a railway power system is provided. In the apparatus, energy flow and the amount of power are calculated and recorded using voltage and current sensors at AC and DC power source sides in various industrial fields, v...