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

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 1.3kW downscaled model.