Horizontal axis wind turbine
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorShigeo YOSHIDA
Life of this patent
Estimating the term…
Abstract
To provide a horizontal axis wind turbine capable of reducing flutter, and by extension, reducing the load on the wind turbine, without controlling the yaw, regardless of the direction of the wind relative to the nacelle. When the wind speed is above a specific value, the yaw angle of the nacelle is held constant, the blade pitch angle is controlled according to the yaw angle Y of the wind direction relative to the nacelle, and the rotor is allowed to rotate freely. Even when the yaw angle of the nacelle is held constant, allowing the rotor to rotate freely makes it possible to reduce the load by avoiding flutter.
Claims10
A horizontal axis wind turbine comprising:
- a turbine holding member;
- a nacelle held by the turbine holding member such that the nacelle is rotatable in a yaw direction;
- a main axis extending through said nacelle, said main axis having an extended portion extending essentially in a horizontal direction from the nacelle;
- and
- a rotor having a hub through which said extended portion of the main axis extends, and a blade extending outwardly from the hub;
- wherein when a wind speed is above a predetermined value, a yaw angle of the nacelle is fixed, a pitch angle of the blade is controlled in accordance with a yaw angle of a wind direction relative to the nacelle, and the rotor is allowed to rotate freely.
Dependencies are inferred from the claim text.