An energy saver for tramway networks using double active bridge and supercapacitors

Electromagnetic processes of charging of on-board supercapacitor storage system during the regenerative braking mode of DC electric rolling stock with series-wound DC motors

“…The estimated payback period equals 7÷8 years. At the same time, it should be pointed out, that according experimental investigation in [4] the life expectancy of supercapacitor storages equals 15 years.…”

“…Undoubtedly, in recent years the supercapacitors with high capacitances have become very popular due to a low weigh and dimensions, high power density, a large number of charge-discharge cycles, long operating lifetime and comparatively short payback period. This leads to numerous researches of the stationary [4,5] or onboard storage systems [6][7][8][9][10][11][12] in the urban transport. Nevertheless, review of the published researches shows that all of them are dedicated to the electric vehicles with AC traction motors.…”