Model and Simulation of a Super-capacitor Braking Energy Recovery System for Urban Railway Vehicles

In this paper, a braking energy recovery system based on super-capacitor was presented. The method use super-capacitor and the conventional braking resistance constitute a new braking unit to realize the regenerative energy recovery, when braking, braking energy will be stored in the super-capacitor by a DC/DC converter. meanwhile, the conventional braking resistance still keep in system to ensure the security. In order to validate the design and do further research, the paper established the mathematical model and simulation model of the whole system, which include power supply unit, traction motor unit, driven control unit, super-capacitor unit etc. the traction motor is AC motor, the motor parameters are set according to the experimental platform and the motor control method is designed as rotor flux oriented vector control. At the end, the simulation is done, the results of simulation is consistent with the experimental results of the test bench, which means the model built in this paper is correct and useable. Based on the mathematical model and simulation model, the further research such as energy efficiency analysis and advanced control method study can be done.