| 摘要 |
DC intermediate voltage increase due to external disturbance must be suppressed when a load is being controlled using a power conversion device, and a DC estimation unit is therefore provided for performing pseudo-differentiation for suppressing higher harmonics to estimate a detected voltage value after a detected DC intermediate voltage has been differentiated. Also provided is an LPF that passes DC instructions for controlling the DC intermediate voltage. The difference between the DC instruction passed through the LPF and the DC estimation value estimated by the DC estimation unit is estimated as the external disturbance value. The external disturbance value and the DC instruction are added using reversed polarity and the result is inputted to the DC controller to generate a voltage instruction. The output voltage of a power rectifier is controlled via a PWM controller. |
