JP2012239252A5 - - Google Patents

Claims (5)

A converter that converts AC power into DC power, an inverter that converts the DC power obtained by the converter into AC power having a voltage and frequency suitable for an AC motor, and supplies the AC power to the AC motor, and is connected in parallel to the inverter. During the power running operation of the AC motor, a part of the power running power is assisted by the discharging operation of the storage device provided therein, and during the regeneration operation of the AC motor, a part of the regenerative power is stored by the charging operation of the power storage device An AC motor driving device comprising:
The power storage circuit is
A current command value for discharging the power storage device based on a voltage value and a current value of DC power on the output side of the converter when a powering power larger than a preset first threshold is used in the AC motor. A power running power compensation unit for generating
When regenerative power having an absolute value larger than a preset second threshold value is regenerated from the AC motor, a current command for charging the power storage device based on the voltage value and current value of DC power on the output side of the converter A regenerative power compensator for generating a value;
The power storage device based on a voltage value and a current value of DC power on the output side of the converter, a voltage value between both ends of the power storage device, and an input / output current value within a preset third threshold value and a fourth threshold value. An auxiliary charge control unit for generating a current command value for charging / discharging the power storage device in order to set a voltage value at both ends of the battery to a predetermined voltage value;
AC motor drive device including The absolute value of the third threshold value is smaller than the absolute value of the first threshold value, and the absolute value of the fourth threshold value is smaller than the absolute value of the second threshold value. The AC motor drive device according to claim 1. 3. The AC motor drive device according to claim 1, wherein the regenerative power compensation unit uses an initial value that is not “0” preset as the current command value when the regenerative operation is started. 4. The AC motor driving apparatus according to any one of claims 1 to 3, wherein the auxiliary charging control unit controls the power storage device to be in a charging operation state immediately before the start of a regeneration operation. The power running when the power compensating unit constituting the power storage circuit, the regenerative time power compensation unit, and any one of claims 1 to 4 a part or all of the auxiliary charge controller is configured by software 1 The AC motor driving device according to Item.