Abstract
With a large capacity, the total energy consumption for electrified train operation of the urban railway system is very high. Therefore, energy-saving solutions are very meaningful to retain their outstanding advantages compared to other means of transportation. Recovering regenerative braking energy is the potential solution to improve energy efficiency. This paper proposes a solution to recover regenerative braking energy by an active rectifier installed at a traction substation capable of bi-directional energy flow. In the braking phase, the motor operates as a generator that returns energy to the utility source. Thanks to the active rectifier, regenerative braking energy will be returned to the source without being burned on the braking resistors. The energy efficiency of this solution is verified by simulation results on Matlab Simulink software with simulation data collected from Cat Linh-Ha Dong urban railway, Vietnam. Evaluating the level of energy savings in the cases with/without active rectifiers showed that using the active rectifier had saved 4.4% of the total traction electric energy.
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