| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress variation of output of an AC electric machine ascribable to variation of power supply voltage after stepping up by a converter without incurring increase of switching loss or a calorific value.SOLUTION: A control device for an AC electric machine driving system, which includes a power supply, a converter, and an inverter that converts power supply voltage after stepping up by the converter into AC voltage and outputs the AC voltage to an AC electric machine M, calculates a duty ratio of PWM control based on target output of the AC electric machine, and controls the inverter based on the duty ratio. When the power supply voltage after the stepping up varies in a preset frequency range with a reference amplitude or greater (150), the control device corrects the duty ratio of the PWM control based on a command value VH# for the converter (160). When the power supply voltage after the stepping up does not vary in the preset frequency range with the reference amplitude or greater, the control device corrects the duty ratio of the PWM control based on a detection value VHd of the power supply voltage after the stepping up (170). |
