Application of Regenerative Braking Energy Injected-grid Device for Subway

At present,the rate of energy utilization is low for the transit regenerative braking on urban rail,most of the energy is consumed by the resistance heating.A regenerative braking energy injected-grid device is designed, which makes use of regenerative braking energy and effectively reduces the temperature rise caused by the resistance in the tunnel.This paper describes the composition and the design procedure of regenerative braking energy injected-grid device and presents a control strategy for the device.The simulation of the single train model verifies that the stability of DC-link voltage can be maintained and more power can be feedback to the grid by the proposed device when the train is braking.The feasibility and effectiveness of the proposed control method are validated by the experimental results.