To solve a problem wherein an energy equivalent to an amount of voltage drop determined by a discharge current and an internal resistance at a point of time reaching the end, remains in a capacitance when discharge is stopped at the point of time when a capacitor voltage reaches a discharge end voltage in a regenerated power absorber for an electric railway.

A charge/discharge current command Ic* computed by conventional control and the internal resistance 5 of the capacitor are multiplied by a multiplier 19, thereby calculating the amount of the voltage drop Vr by the internal resistance 5. This Vr is added to the discharge end voltage V2, thereby calculating a new discharge end voltage setting value V2'.