| 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 inputs, in an operation region up to the rated number of revolution from the starting of the wind-mill. CONSTITUTION:With a wind-mill 1 driving an induction machine 2, the pitch angle of a blade is kept constant up to the rated number of revolution, and the pitch angle is controlled so that the number of revolution of the wind-mill reaches rated one in an operation region of the rated number of revolution or more. A comparator 32 transmits a deviation between an output command signal PREF corresponding to the number of revolution N of the wind-mill 1 and an output signal P over a compensation circuit 33. A deviation between a signal obtained by F/V converting the number of revolution N and an output from the compensation circuit 33 is inputted to an exciting-frequency command circuit 36, and the circuit 36 transmits an exciting-frequency command over a converter 30 so that the ratio of generator voltage/operation frequency is kept constant up to the rated number of revolution and so that generator voltage is kept constant at the rated number of revolution or more.</p> |
