Pages 370-375
Energy storage media have been remarkably developed in recent years to constitute an energy storage system. Electric double-layer capacitors can be rapidly charged and discharged and offer a long life time, high efficiency and maintenance free/low pollution features. Charge and discharge tests of a prototype energy storage system at DC 400V were carried out and found that it provides a stable power supply system for DC electric railways. On the other hand, a hybrid system to apply different energy storage media in parallel according to the load pattern may be effective. We carried out fundamental tests about different energy storage media and a hybrid system at DC 75V.
