Modeling and measurements at Østerild
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1 Wind Energy Department, Risø DTU, Roskilde, Denmark October 2010 Vattenfall, Fredericia, Denmark
2 Outline Test station Østerild IEC standard
3 Outline Test station Østerild IEC standard How much wood? Measurements Modeling
4 Outline Test station Østerild IEC standard How much wood? Measurements Modeling Conclusion
5 Høvsøre designed for turbines up to 160 m (tip height)
6 The search for a new test site
7 Layout of Østerild test station
8 Forest types around Østerild
9 View from Bulbjerg (11km) 132 M1 Bulbjerg - eksisterende forhold
10 View from Bulbjerg (11km) M1 Bulbjerg - fremtidige forhold, afstand til nærmeste vindmølle ca.11,5 km. 133
11 View from Østerild (4km) 156 N5 Østerild - eksisterende forhold
12 View from Østerild (4km) N5 Østerild - fremtidige forhold, afstand til nærmeste vindmølle ca. 4,1 km. 157
13 IEC standard Power performance measurements of electricity producing wind turbines No significant obstacles in the measurement sector within 20 rotor diameters Maximum rotor diameter at Østerild: 200 m No obstacles within 4 km West ±45 is the measurements sector > 10 km 2 forest has to be cut! Is a forest edge a significant obstacle?
14 Lidar measurements at Østerild Three positions, two of those with 45 m met masts
15 Average profiles of wind, direction and turbulence
16 Individual profiles of 10 min. mean wind speed
17 Profiles of turbulence intensity
18 Turbulence intensity versus distance to forest edge 45 m a.g.l.
19 Turbulence intensity versus distance to forest edge 100 m a.g.l.
20 Modeling with SCADIS All neutral atmospheric stratification Existing terrain
21 Modeling with SCADIS All neutral atmospheric stratification Existing terrain Remove forest out to 1.5 km to the west of the turbine row (except the two southernmost turbines)
22 Modeling with SCADIS All neutral atmospheric stratification Existing terrain Remove forest out to 1.5 km to the west of the turbine row (except the two southernmost turbines) Remote forest out to 2 km to the west of the turbine row
23 Model input from KMS s surface scans Height of the terrain
24 Model input from KMS s surface scans Total height
25 Model input from KMS s surface scans Height of obstacles
26 SCADIS calculation domain Existing terrain km
27 SCADIS calculation domain Cleared to 1.5 km km
28 SCADIS calculation domain Cleared to 2 km km
29 Selected calculated profiles of the mean wind speed
30 Calculated turbulence intensities
31 Conclusion SCADIS (only run for neutral strat.) matches the mean profiles of wind speed and turbulence reasonably well. Much more comparison remains.
32 Conclusion SCADIS (only run for neutral strat.) matches the mean profiles of wind speed and turbulence reasonably well. Much more comparison remains. Variability at Østerild is not only caused by the terrain
33 Conclusion SCADIS (only run for neutral strat.) matches the mean profiles of wind speed and turbulence reasonably well. Much more comparison remains. Variability at Østerild is not only caused by the terrain Beyond km the forest impact is hard to see
34 Conclusion SCADIS (only run for neutral strat.) matches the mean profiles of wind speed and turbulence reasonably well. Much more comparison remains. Variability at Østerild is not only caused by the terrain Beyond km the forest impact is hard to see Atmospheric stability, instationarity seems to generate large variability in wind profiles and turbulence.
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