Power loss in the upper cut-out wind speed interval
Article first published online: 19 MAR 2004
Copyright © 2004 John Wiley & Sons, Ltd.
Volume 7, Issue 1, pages 37–46, January/March 2004
How to Cite
Kristensen, L., Højstrup, J. and Rathmann, O. (2004), Power loss in the upper cut-out wind speed interval. Wind Energ., 7: 37–46. doi: 10.1002/we.106
- Issue published online: 19 MAR 2004
- Article first published online: 19 MAR 2004
- Manuscript Accepted: 20 OCT 2003
- Manuscript Revised: 5 SEP 2003
- Manuscript Received: 11 JUN 2003
- wind turbine;
- power loss;
- sea surface state
Time series of mean wind speeds at several sites in Denmark have been used to estimate the power loss for wind turbines in the wind speed interval from where the operation has to stop at high winds to where a lower wind speed allows the operation to resume. For inland wind turbines the fractional loss is less than 0·25%. For offshore wind turbines it may be as high as about 1·5%. To facilitate the estimation of ‘dead zone’ power loss for offshore wind turbines, an engineering model for the sea surface state has been developed on the basis of a generalization of Charnock's roughness model and the geostrophic drag law. This model predicts the surface friction velocity and the surface roughness as functions of the geostrophic wind speed and the length of the water fetch. Copyright © 2004 John Wiley & Sons, Ltd.