| 摘要 |
PURPOSE:To stably operate by momentarily resetting the voltage deviation integrated amount of a converter control circuit to the deceleration of an induction motor, and accelerating the switching time from power drive to regenerative drive. CONSTITUTION:One terminal of a converter 2 is connected with an AC power source 1, and the other terminal is connected through an inverter 4 with a load 5. A proportional controller 6 multiplies the prescribed proportional multiplier by the difference between the voltage of the other terminal of the converter 2 and the voltage command, and an integrating controller 7 multiplies the prescribed integrating constant by the integrated amount of the difference between the voltage of the other terminal of the converter 2 and the voltage command. The outputs of the controllers 6, 7 are added, and input to a phase angle instruction unit 8. The unit 8 controls a firing command supplied to the converter 2 so as to reset the integrated amount of the controller 7 to zero when the polarity of the difference between the voltage of the other terminal of the converter 2 and the voltage command varies to set the detected difference to zero. |
