Study on a method by energy management the engine for controlling output power of hybrid powered railway vehicles with Electric Double Layer Capacitors

In this paper, an energy control method to decide the engine output power according to the error of the Electric Double Layer Capacitors (EDLCs) energy, instead of the EDLCs voltage. By means of this method, the control system can be dealt with a linear system and the feature enables systematic designing method of the threshold of the EDLCs energy error to decide the engine output power, independent from the EDLCs voltage and the EDLCs capacitance. The proposed methods are verified by numerical simulations, assuming a train operation in a typical rural line.