Evaluation of wind farm efficiency and wind turbine wakes at the Nysted offshore wind farm
Article first published online: 25 MAY 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Volume 13, Issue 6, pages 573–586, September 2010
How to Cite
Barthelmie, R. J. and Jensen, L. E. (2010), Evaluation of wind farm efficiency and wind turbine wakes at the Nysted offshore wind farm. Wind Energ., 13: 573–586. doi: 10.1002/we.408
- Issue published online: 25 MAY 2010
- Article first published online: 25 MAY 2010
- Manuscript Accepted: 13 APR 2010
- Manuscript Revised: 3 OCT 2009
- Manuscript Received: 17 APR 2009
- wind farms;
Here, we quantify relationships between wind farm efficiency and wind speed, direction, turbulence and atmospheric stability using power output from the large offshore wind farm at Nysted in Denmark. Wake losses are, as expected, most strongly related to wind speed variations through the turbine thrust coefficient; with direction, atmospheric stability and turbulence as important second order effects. While the wind farm efficiency is highly dependent on the distribution of wind speeds and wind direction, it is shown that the impact of turbine spacing on wake losses and turbine efficiency can be quantified, albeit with relatively large uncertainty due to stochastic effects in the data. There is evidence of the ‘deep array effect’ in that wake losses in the centre of the wind farm are under-estimated by the wind farm model WAsP, although overall efficiency of the wind farm is well predicted due to compensating edge effects. Copyright © 2010 John Wiley & Sons, Ltd.