The methods to stabilize power sources have been important issues for the DC feeding circuit. Therefore, a number of applications for energy storage have been investigated so far. In recent years, energy storage media have remarkably developed for power supply to drive electric vehicles. Therefore, we produced a prototype of energy storage for the DC electric railway system that consists of electric double-layer capacitors, diode bridge rectifiers, a chopper system and PWM converters. Useful information was obtained from the charge and discharge tests of the prototype. This paper describes experimental results.

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