A drive control device for an electric train, comprising: - a switch that is adapted to connect or open direct-current electric power; - a power converter into which the direct-current electric power is input via the switch between two terminals on an input side, that is adapted to convert the direct-current electric power into alternating-current electric power through a switching operation, and drive an alternating-current rotating machine connected to an output side; - a voltage detector that is adapted to detect a voltage between the two terminals; - a filter capacitor connected between the two terminals; and - a capacitor voltage regulator connected between the two terminals in parallel with the filter capacitor and having a switching device; characterized in that - a power controller that is adapted to control the power converter such that when the voltage detected by the voltage detector exceeds a predetermined open-circuit voltage, the switch opens and regenerative brake power is reduced by the alternating-current rotating machine in a predetermined reduction pattern having a ramp reduction time (RMPL) longer than zero; wherein the power controller is adapted to intermittently control the switching device and regulate a charge amount in the filter capacitor so that the detected voltage is not less than a first voltage and not greater than a second voltage over the ramp reduction time (RMPL), wherein the power controller is adapted to set a conduction ratio of the switching device to be zero when a voltage deviation is zero or negative, and when the voltage deviation is positive, increase the conduction ratio when the voltage deviation increases, wherein the voltage deviation is determined by subtracting a third voltage from the detected voltage, wherein the third voltage is greater than the first voltage and less than the second voltage, and the predetermined open-circuit voltage is the third voltage. - a switch that is adapted to connect or open direct-current electric power; - a power converter into which the direct-current electric power is input via the switch between two terminals on an input side, that is adapted to convert the direct-current electric power into alternating-current electric power through a switching operation, and drive an alternating-current rotating machine connected to an output side; - a voltage detector that is adapted to detect a voltage between the two terminals; - a filter capacitor connected between the two terminals; and - a capacitor voltage regulator connected between the two terminals in parallel with the filter capacitor and having a switching device; characterized in that - a power controller that is adapted to control the power converter such that when the voltage detected by the voltage detector exceeds a predetermined open-circuit voltage, the switch opens and regenerative brake power is reduced by the alternating-current rotating machine in a predetermined reduction pattern having a ramp reduction time (RMPL) longer than zero; wherein the power controller is adapted to intermittently control the switching device and regulate a charge amount in the filter capacitor so that the detected voltage is not less than a first voltage and not greater than a second voltage over the ramp reduction time (RMPL), wherein the power controller is adapted to set a conduction ratio of the switching device to be zero when a voltage deviation is zero or negative, and when the voltage deviation is positive, increase the conduction ratio when the voltage deviation increases, wherein the voltage deviation is determined by subtracting a third voltage from the detected voltage, wherein the third voltage is greater than the first voltage and less than the second voltage, and the predetermined open-circuit voltage is the third voltage.