Droop Control Strategy of Controlled Three-Phase PWM Rectifier for Hybrid Train Propulsion

In this paper, diesel-electric generator in hybrid configuration with battery is developed for a train propulsion system. In the hybrid mode operation, the power is shared between the generator and the battery. PWM rectifier device become an important component as interface between generator, battery, and inverter motor drive to ballance the energy in the propulsion system. It has several operation modes such as powering mode to achieve full speed, breaking mode to charge battery and full charging when SOC battery is low. To overcome this challange, this research proposes droop control strategy for the three-phase PWM rectifier to share active power between the generator and the battery. This control strategy is capable to share the amount power and can be easily adjusted according to the given gain, namely kdroop. The simulation results prove the effectiveness of the proposed control strategy.