| 摘要 |
A downwind type windturbine and a method of stopping the same are provided. The load acting on blades 1 when the windturbine is stopped can be reduced by an elaborative control of a pitch angle of the blades. When stopping the downwind type windturbine, the pitch angle is changed in a direction to increase an inflow angle to bring the blades 1 to a feathering state with the trailing edge of the blades 1 positioned upwind (negative feathering). When the pitch angle (or a state quantity correlating with the pitch angle, such as wind velocity) exceeds a predetermined value when stopping the windturbine, instead of the negative feathering, the pitch angle is changed in a direction to decrease the inflow angle to bring the blades 1 to the feathering state with the trailing edge of the blades 1 positioned downwind (positive feathering) via the inflow angle of zero degree. |
