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Media type:
E-Article
Title:
Robust active wake control in consideration of wind direction variability and uncertainty
Contributor:
Rott, Andreas;
Doekemeijer, Bart;
Seifert, Janna Kristina;
van Wingerden, Jan-Willem;
Kühn, Martin
Published:
Copernicus GmbH, 2018
Published in:
Wind Energy Science, 3 (2018) 2, Seite 869-882
Language:
English
DOI:
10.5194/wes-3-869-2018
ISSN:
2366-7451
Origination:
Footnote:
Description:
Abstract. The prospects of active wake deflection control to mitigate wake-inducedpower losses in wind farms have been demonstrated by large eddy simulations,wind tunnel experiments, and recent field tests. However, it has not yet beenfully understood how the yaw control of wind farms should take into accountthe variability in current environmental conditions in the field and theuncertainty in their measurements. This research investigated the influenceof dynamic wind direction changes on active wake deflection by intended yawmisalignment. For this purpose the wake model FLORIS was used together withwind direction measurements recorded at an onshore meteorologicalmast in flat terrain. The analysis showed that active wake deflection hasa high sensitivity towards short-term wind directional changes. This can leadto an increased yaw activity of the turbines. Fluctuations and uncertaintiescan cause the attempt to increase the power output to fail. Therefore amethodology to optimize the yaw control algorithm for active wake deflectionwas introduced, which considers dynamic wind direction changes andinaccuracies in the determination of the wind direction. The evaluation basedon real wind direction time series confirmed that the robust controlalgorithm can be tailored to specific meteorological and wind farm conditionsand that it can indeed achieve an overall power increase in realistic inflowconditions. Furthermore recommendations for the implementation are givenwhich could combine the robust behaviour with reduced yaw activity.