| 摘要 |
<P>PROBLEM TO BE SOLVED: To quickly suppress fluctuation in a direct-current intermediate voltage due to disturbance by a feedforward control method which does not require direct current detection. <P>SOLUTION: Control to match the direct-current intermediate voltage V<SB>DC</SB>of an inverter arrangement 10 is carried out. The differential value of the direct-current voltage V<SB>DC</SB>when disturbance is inputted to a direct-current intermediate circuit is determined. The product of the differential value and the estimated capacitance value C<SB>O</SB>of a capacitor is computed by a direct current computation circuit 27. The computed product is added to a control signal for the direct-current intermediate voltage with such polarity that the disturbance is canceled out. At this time, the estimated capacitance value C<SB>O</SB>of the capacitor is calculated from a variation in the direct-current intermediate voltage which takes place when a voltage is applied to the inverter arrangement 10. Alternatively, control to match the direct-current intermediate voltage V<SB>DC</SB>of the inverter arrangement 10 is carried out. A disturbance signal inputted to the direct-current intermediate circuit is added to a signal for controlling the direct-current intermediate voltage V<SB>DC</SB>with such polarity that the disturbance is canceled out. <P>COPYRIGHT: (C)2004,JPO |
