Review of regenerative energy utilization in traction power supply system in Japan: Applications of energy storage systems in d.c. traction power supply system - Hitoshi Hayashiya; Yuki Iino; Hirotaka Takahashi; Keiji Kawahara; Takashi Yamanoi; Takahiro Sekiguchi; Hideto Sakaguchi; Akihiko Sumiya; Shinichiro Kon (IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, Beijing, China, October 29 - November 1, 2017, 2017)