Application of inverter parallel operation strategy in railway auxiliary converters

This paper describes the implementation of a control strategy for the parallel cooperation of inverters to railway auxiliary converters. The three-phase outputs of the parallel system of auxiliary converters are connected to a common bus. To ensure proper operation and load current sharing, droop-based algorithms are used to control the inverters. The proposed inverter control technique and strategy of inverter outputs and loads connection to a common bus was verified on a four auxiliary converters parallel system. The achieved current sharing in static and dynamic states of a parallel system is presented.