Power conversion device

摘要

A power conversion device formed of a converter for rectifying a single-phase AC voltage to a DC voltage and an inverter for driving an AC motor by converting the DC voltage to an AC voltage includes: a first compensation unit that uses a frequency component twice the frequency of the single-phase AC voltage with respect to the DC voltage outputted from the converter or a current outputted from the inverter as a compensation value for at least one of a torque command value, a current command value, a voltage command value, a frequency command value, and a phase angle command value; and a second compensation unit that uses the DC voltage outputted from the converter or a current outputted from the inverter after being subjected to low frequency cut-off processing and gain processing.

主权项

1. A power conversion device, comprising:
a converter for converting a single-phase AC voltage to a DC voltage through rectification; an inverter for feeding a motor by converting the DC voltage as an output of the converter to an AC voltage; a current command value generation unit for outputting a current command value for the motor according to a torque command value; a frequency command value generation unit for outputting a frequency command value of the AC voltage for the motor according to a speed signal of the motor; a phase angle command value generation unit for calculating a phase angle command value on the basis of speed information or axis position information of the motor; a voltage command value generation unit for generating a voltage command value to the inverter using the current command value, the frequency command value, and the phase angle command value; and a compensation unit for adding a compensation value to or subtracting the compensation value from at least one of the torque command value, the current command value, the voltage command value, the frequency command value, and the phase angle command value, the compensation unit includes:
a first compensation unit for extracting a frequency component twice a frequency of the single-phase AC voltage from the DC voltage outputted from the converter or a current outputted from the inverter to apply gain processing to the extracted component, and using a result of the processing as the compensation value; anda second compensation unit for applying low frequency cut-off processing to the DC voltage outputted from the converter or a current outputted from the inverter, using a frequency selected at or below an electric angular maximum frequency of the motor as a cut-off frequency to apply gain processing to the processed component, and using a result of the processing as the compensation value.