| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably execute output voltage command correction control in case a capacitor connected between DC bus-bars is of small capacity. <P>SOLUTION: When a power supply resonance frequency is out of a passband of a bandpass filter 21 that allows a component of frequency six times a power supply frequency to pass therethrough, an added voltage of an output voltage of the bandpass filter 21 and an output voltage of a low-pass filter 22, cutting off a voltage component of the power supply resonance frequency and a voltage component of a frequency six times the power supply frequency, is inputted to an output voltage command correction part 20 via a switching part 18. When the power supply resonance frequency is in the passband of the bandpass filter 21, an output voltage of the low-pass filter 26, cutting off a voltage component of the power supply resonance frequency, is inputted to the output voltage command correction part 20 so as to add a corrected value, which corresponds to an output voltage of a high-pass filter 25 that allows a power supply resonance frequency band to pass therethrough, to a frequency command in a frequency command correction part 19. <P>COPYRIGHT: (C)2009,JPO&INPIT |
