Determining The Droop Coefficient of PWM Rectifier in Hybrid Train Application

This paper introduces the development of a hybrid configuration for a train propulsion system, integrating diesel-electric generator and battery. The hybrid mode operation involves power sharing between generator and battery. An essential component in this system is the PWM rectifier device, serving as an interface between the generator, battery, and inverter motor drive to balance energy in the propulsion system. The rectifier operates in various modes, including powering mode for achieving full speed, breaking mode to charge the battery, and full charging when the State of Charge (SOC) of the battery is low. To address challenges in power sharing, the research proposes a droop control strategy for the three-phase PWM rectifier, enabling effective active power distribution between the generator and the battery. The control strategy, with an adjustable parameter ( ), demonstrates its capability to dynamically regulate power sharing. Simulation results validate the effectiveness of the proposed control strategy.