Research of Regenerative Braking Energy Utilization in Urban Rail Transit

The voltage of DC traction network is decreased to ensure the stability of power network by utilizing regenerative braking energy generated by metro. This paper adds the function of inverter feedback based on the original resistance energy-consuming device, and designs an inverter-resistive hybrid feedback device. It mainly describes the design method, hardware composition and control method of the device. The simulation of the braking condition of the DC traction network metro is carried out, and the simulation results are compared with the pure resistance energy consumption simulation. It is verified that the traction network voltage can be rapidly reduced and stabilized when the metro is braking, and the problem of resistance heating in the tunnel is improved to a large extent. At the same time, the energy of the DC traction network is inversed into the three-phase AC power grid, so that the utilization ratio of the regenerative braking energy is improved. The system design can achieve high efficiency absorption of regenerative braking energy and ensure the safe and stable operation of the metro.