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Title:
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Application of LiDARs in Annual Energy Production Assessment of Wind Turbines
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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12-9-2016
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ECN report number:
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Document type:
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ECN-E--16-049
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ECN publication
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Number of pages:
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Full text:
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37
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Download PDF
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Abstract:
The first work package of the LAWINE project is allocated to the application of LiDARs in wind resource assessments. In this report, energy production of a prototype 2.5 MW wind turbine at “ECN Wind turbine Test site Wieringermeer” or EWTW are estimated using a meteorological mast, as well as a ground-based LiDAR and these are compared to the actual power production of the turbine.
The comparison of predicted and actual energy yield utilising hub height wind speed shows that using a meteorological mast, the energy yield prediction was 2.9% lower than the actual production. The ground based LiDAR showed a smaller deficit, being 0.7% lower than the actual energy yield. There was evidence in the results to suggest that the difference in the values is not due to limitations in either device, however it is more likely due to a small offset (under prediction) of the local wind speed from the meteorological mast measurement device.
The main benefits of ground based LiDAR devices are their better economics as well as the ability to measure easily at multiple heights covering the rotor area. Part of this report was also dedicated to investigating if the calculation of the rotor equivalent wind speed (REWS) resulted in better prediction of the energy yield compared to the calculations using the hub height wind speed. The analysis using the rotor equivalent wind speed at this site was inconclusive and made it difficult to draw conclusions. Further work should be completed utilising a larger data set and more turbines with REWS verified power curves in order to gain stronger conclusions on this subject.
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