| 摘要 |
<p>PURPOSE:To acquire energy effectively by conducting variable speed control through which a wind-mill is operated by the number of revolution corresponding to an input to the wind-mill up to the rated number of revolution of the wind-mill. CONSTITUTION:With a wind-mill 1 diving an induction machine 2, the pitch angle of a blade is kept constant at the rated number of revolution or less, and the pitch angle is controlled so as to reach the rated number of revolution in an operation region of the rated number of revolution or more. A comparator 12 transmits a deviation between an output command signal PREF corresponding to the number of revolution N of the wind-mill and an output P over a compensation circuit 13. A deviation between the number of revolution N and an output from the compensation circuit 13 is inputted to an exciting-frequency command circuit 15, and the circuit 15 outputs the exciting-frequency command of a first converter 3 so that the ratio of generator voltage/operation frequency is kept constant at the rated number of revolution or less and so that generator voltage is kept constant at the rated number of revolution or more. An output from the first converter 3 is stored in an accumulating facility 30, and power stored in the accumulating facility 30 is fed to an output line 30 through a second converter 4.</p> |
