Abstract
This work presents the first, long-term, demonstration case of the use of spinner anemometers for power curve measurements in an offshore wind farm. The stability of the spinner anemometer wind speed and its STF during a 22-month measurement period was quantified, using a nacelle lidar as reference. Power curves and annual energy productions (AEPs) were obtained using this long-term data set, to assess the spinner anemometer wind speed stability. Next, several STFs were obtained at a reference turbine in different periods (four two-months periods) to assess the STF seasonality. Finally, the AEPs of three neighbouring turbines were analysed using the STFs generated at the reference turbine.
Highlights
The spinner anemometer is an instrument installed on a wind turbine spinner that measures wind inflow angles and horizontal wind speed in the center of the turbine rotor
We investigated the reproducibility of the spinner anemometer power curves and the suitability of the spinner transfer function (STF) derived from the reference turbine, which was applied to several turbines in the wind farm
Long-term STF analysis The following section focuses on presenting results from the reference turbine, that were gained by applying the long-term STF to spinner anemometer measurements
Summary
The spinner anemometer is an instrument installed on a wind turbine spinner that measures wind inflow angles and horizontal wind speed in the center of the turbine rotor. Since it measures inside the turbine induction zone, it requires a Spinner Transfer Function (STF, the equivalent of the NTF for nacellemounted sensors [1]) to obtain the “free wind speed”. We investigated the reproducibility of the spinner anemometer power curves and the suitability of the STF derived from the reference turbine, which was applied to several turbines in the wind farm
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