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Steering Wind Turbines Creates Greater Energy Potential

  • June 29, 2021
  • Journal of Renewable and Sustainable Energy
  • News
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From the Journal: Journal of Renewable and Sustainable Energy

WASHINGTON, June 29, 2021 — As wind passes through a turbine, it creates a wake that decreases the downstream average wind velocity. The faster the spin of the turbine blades relative to the wind speed, the greater the impact on the downstream wake profile.

For wind farms, it is important to control upstream turbines in an efficient manner so downstream turbines are not adversely affected by upstream wake effects. In the Journal of Renewable and Sustainable Energy, by AIP Publishing, researchers from the University of Illinois at Urbana-Champaign show that by designing controllers based on viewing the wind farm system as a coupled network, it is possible to extract power more efficiently.

Wind turbine with yaw angle and pitch angle. CREDIT: Amir Rez Mamouri, Abdolamir Bak Khoshnevis, Esmail Lakzian; Adapted from "Experimental study of the effective parameters on the offshore wind turbine's airfoil in pitching case," Ocean Engineering Volume 198 (2020)
Wind turbine with yaw angle and pitch angle. CREDIT: Amir Rez Mamouri, Abdolamir Bak Khoshnevis, Esmail Lakzian; Adapted from “Experimental study of the effective parameters on the offshore wind turbine’s airfoil in pitching case,” Ocean Engineering Volume 198 (2020)

“If you think of a wind farm as a group of turbines each vying for the incoming wind, if every turbine is greedy and tries to maximize its own power, the system as a whole is suboptimal,” said author Lucas Buccafusca. “Our work seeks to design controls for turbines to work collectively, thereby improving performance.”

The researchers apply a model predictive control (MPC) framework for varying wind velocities and incorporate wake steering techniques to demonstrate there can be a potential benefit to incorporating these methods into future wind turbine control algorithms. The researchers aim to mitigate the effects of turbulence and power spikes caused by wind passing through upstream turbines.

“When observing the power extractions, it is surprising just how much the gains can be for even small wind turbine arrays simply by implementing wake steering techniques,” said Buccafusca.

The researchers found having control algorithms that consider downstream effects results in a noticeable increase in performance. The method for assigning turbine controls used axial induction factors and yaw misalignment controls that were shown via wake steering simulations to validate the results.

The researchers plan to explore applying similar methods to a distributed wind turbine energy problem, where each turbine has a local battery based on excess energy provided. The battery can return that energy when supply is low, such as when the wind velocity is too low to meet the grid operator’s demand.

While the researchers focused primarily on the wind turbine power tracing problem, the same multiobjective MPC framework can be used in a variety of distributed optimization or consensus problems.

###

For more information:
Larry Frum
media@aip.org
301-209-3090

Article Title

Multiobjective model predictive control design for wind turbines and farms

Authors

Lucas Buccafusca and Carolyn Beck

Author Affiliations

University of Illinois at Urbana-Champaign


Journal of Renewable and Sustainable Energy

Journal of Renewable and Sustainable Energy is an interdisciplinary, peer-reviewed journal covering all areas of renewable and sustainable energy that apply to the physical science and engineering communities.

http://jrse.aip.org

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