ENBIS-17 in Naples

9 – 14 September 2017; Naples (Italy) Abstract submission: 21 November 2016 – 10 May 2017

Wind Turbine Performance Decline in Sweden

12 September 2017, 18:20 – 18:40


Submitted by
Jesper Rydén
Jesper Rydén (Uppsala University), Jon Olauson (Uppsala University)
Performance loss of wind turbines on a national scale is crucial for energy planning. Often in reliability, studies are made at component levels, but focus is here on the overall reduction of performance with age. The evolution of downtime with age is examined and factors explaining differences in trends are considered. Time series are long-term using different meteorological models and to investigate the influence from various factors, regression modelling techniques are employed. To assess uncertainties, a bootstrap approach was taken. It is found that Swedish wind turbines lose around 0.10 pp/year. For units built before 2007, the median decline is 0.15 pp/year, corresponding to an 20-year energy loss of around 6%.
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