Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2018-15
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
27 Feb 2018
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Wind Energy Science (WES).
Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines
Wim Munters and Johan Meyers Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300A, 3001 Leuven, Belgium
Abstract. Wake interactions between wind turbines in wind farms lead to reduced energy extraction in downstream rows. In recent work, optimization and large-eddy simulation were combined with optimal dynamic induction control of wind farms to study the mitigation of these effects, showing potential power gains of up to 20 % (Munters & Meyers 2017 Phil Trans R Soc A 375, 20160100, doi:10.1098/rsta.2016.0100). However, the computational cost associated with these optimal control simulations impedes practical implementation of this approach. Furthermore, the resulting control signals optimally react to the specific instantaneous turbulent flow realizations in the simulations, so that they cannot be simply used in general. The current work focuses on the detailed analysis of the optimization results of Munters & Meyers, with the aim to identify simplified control strategies that mimic the optimal control results and can be used in practice. The analysis shows that wind-farm controls are optimized in a parabolic manner with little upstream propagation of information. Moreover, turbines can be classified into first-row, intermediate-row, and last-row turbines based on their optimal control dynamics. At the moment, the control mechanisms for intermediate-row turbines remain unclear, but for first-row turbines we find that the optimal controls increase wake mixing by periodic shedding of vortex rings. This behavior can be mimicked with a simple sinusoidal thrust control strategy for first-row turbines, resulting in robust power gains for turbines in the entrance region of the farm.
Citation: Munters, W. and Meyers, J.: Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2018-15, in review, 2018.
Wim Munters and Johan Meyers
Wim Munters and Johan Meyers
Wim Munters and Johan Meyers

Viewed

Total article views: 205 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
141 60 4 205 8 2

Views and downloads (calculated since 27 Feb 2018)

Cumulative views and downloads (calculated since 27 Feb 2018)

Viewed (geographical distribution)

Total article views: 205 (including HTML, PDF, and XML)

Thereof 202 with geography defined and 3 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 23 May 2018
Publications Copernicus
Download
Share