To protect the equipment from a high voltage when the regeneration voltage rises more than constancy, the regenerative brake does the control that narrows the regenerative electric power. To understand the operation situation of a present regenerative brake, the system that collected and analyzed the operation of the vehicle was constructed, and we collected and analyzed the data of the train in commercial operation for several years. As a result, it has been understood that the regenerative electric power is greatly narrowed when applying the brakes in the section where the driving density of the train is low. Then, the operation availability of the regenerative brake was improved by 7% on the average by changing the pattern that narrowed the regenerative electric power to the control that began narrowing of a voltage that was higher than a present setting, and the power attenuation was able to be decreased by 33% on the average.
