The state of the art in yaw alignment control is based on nacelle anemometry. However, nacelle anemometry is very complex, and this gives rise to unnecessary yaw errors which reduces power and increases loads. A new concept, spinner anemometry, is a wind measurement principle which eliminates errors in yaw error measurements, see ref. 1. Measurements on a full size wind turbine with this concept were made for the first time in 2008, see ref. 2 and 3. The spinner anemometer concept is now used in the project "Spinner-Farm" for yaw alignment control to optimize power. First, tests and optimizations on a single on-land turbine are made. Then tests are performed on a whole row of turbines in an off-shore wind farm.
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