Methods for Reducing AC Battery Current in Dual‐Source Trains Powered by Battery and AC Catenary Using a Single‐Phase Full‐Bridge Converter

ABSTRACT In this study, we aimed to reduce the AC battery current in dual‐source electrical trains powered by batteries and AC catenary using an auxiliary converter along with a small DC inductor connected in series with the batteries. The auxiliary converter is equivalent to a conventional single‐phase converter, and it works to reduce the 120‐Hz AC current according to the operating modes of the train. The operating principles and control methods of the proposed system, including the detailed current analysis, were experimentally validated using a 1.3 kW downscaled model.