Implementation of charger current sharing method in railway application using CAN bus

This paper presents the application of parallel cooperation of chargers in auxiliary converters of rolling stock. A control strategy based on CAN serial bus communication has been proposed to achieve even load power sharing by the individual chargers of the parallel system without affecting the accuracy of the output voltage regulation. The paper describes the principle of the proposed control strategy and presents the regulation structure block diagram. The properties of the created control software for parallel cooperation of chargers were experimentally verified on a parallel system of two converters. The measured currents in static and dynamic modes are presented.