| 摘要 |
The present invention suppresses a voltage fluctuation across the ends of a buffer capacitor of a power buffer circuit of a direct power converter in the event of a fluctuation in the electrostatic capacitance of the buffer capacitor. This control device (10) is provided with a charge control unit (103). The charge control unit (103) has an amplitude determination part (103a), a charge command generation part (103b), and charge operation control part (103c). The amplitude determination part (103a) performs at least proportional integral control with respect to the deviation (∆Vc) between an average voltage command value (Vc*), that is, a command for the average value of voltage (Vc) across the ends of the buffer capacitor, and the voltage (Vc) across the ends, and determines the amplitude (Im) of an input current to the converter. The charge command generation part (103b) multiplies the amplitude (Im) by a function (F (θ)) that is determined in accordance with a discharge duty cycle (dc), a rectification duty cycle (drec), and a power distribution ratio and determines a charge command (iL*). The charge operation control part (103c) controls the charging operation of the buffer capacitor on the basis of the charge command (iL*). |
