Inverter control device and power conversion device

摘要

INVERTER CONTROL DEVICE AND POWER CONVERSION DEVICE There is disclosed herein an inverter control device for controlling an inverter (140) which converts DC power supplied thereto via an LC filter including a reactor (120) and a capacitor (130) into AC power having an intended frequency and an intended voltage value, and supplies the converted power to an AC motor (150), the inverter control device comprising: control calculation sections (204-208) for calculating an output voltage command; an output voltage correction section (202) for directly receiving a DC voltage value from a DC voltage detection section (201) which detects a voltage of DC power supplied to the inverter (140) so as to correct an output voltage command from the control calculation sections (204-208) based on the DC voltage value; a PWM calculation section (203) for calculating a control signal for PWM-controlling the inverter (140) based on an output voltage command from the output voltage correction section (202); a fluctuation component detection section (211) for detecting a fluctuation component (the fluctuation component at least not including a DC component and including a resonance frequency (fo) component of the LC filter) of the DC voltage detected by the DC voltage detection section (201); a link resonance compensation section (213) for calculating an amount of compensation (amount of link resonance compensation) for reducing link resonance due to the LC filter based on the fluctuation component detected by the fluctuation component detection section (211); a limitation section (212) for limiting the amount of link resonance compensation to a predetermined range; and a correction section (214) for correcting, by the amount of link resonance compensation limited by the limitation section (212), an input command to one (206) of the compensators (204-208) in the control calculation section that has such a control band with which it is possible to control the resonance frequency (fo) of the LC filter.