Special Issue Paper
The impact of turbulence intensity and atmospheric stability on power deficits due to wind turbine wakes at Horns Rev wind farm
Article first published online: 17 NOV 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Special Issue: The UpWind Special Issue
Volume 15, Issue 1, pages 183–196, January 2012
How to Cite
Hansen, K. S., Barthelmie, R. J., Jensen, L. E. and Sommer, A. (2012), The impact of turbulence intensity and atmospheric stability on power deficits due to wind turbine wakes at Horns Rev wind farm. Wind Energ., 15: 183–196. doi: 10.1002/we.512
- Issue published online: 20 JAN 2012
- Article first published online: 17 NOV 2011
- Manuscript Revised: 5 AUG 2011
- Manuscript Accepted: 5 AUG 2011
- Manuscript Received: 8 SEP 2010
- wind farms;
- power deficits
The wind turbine operational characteristics, power measurements and meteorological measurements from Horns Rev offshore wind farm have been identified, synchronized, quality screened and stored in a common database as 10 min statistical data. A number of flow cases have been identified to describe the flow inside the wind farm, and the power deficits along rows of wind turbines have been determined for different inflow directions and wind speed intervals. A method to classify the atmospheric stability based on the Bulk-Ri number has been implemented. Long-term stability conditions have been established, which confirms, in line with previous results, that conditions tend towards near neutral as wind speeds increase but that both stable and unstable conditions are present at wind speeds up to 15 m s −1. Moreover, there is a strong stability directional dependence with southerly winds having fewer unstable conditions, whereas northerly winds have fewer observations in the stable classes. Stable conditions also tend to be associated with lower levels of turbulence intensity, and this relationship persists as wind speeds increase. Power deficit is a function of ambient turbulence intensity. The level of power deficit is strongly dependent on the wind turbine spacing; as turbulence intensity increases, the power deficit decreases. The power deficit is determined for four different wind turbine spacing distances and for stability classified as very stable, stable and others (near neutral to very unstable). The more stable the conditions are, the larger the power deficit. Copyright © 2011 John Wiley & Sons, Ltd.