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Active rotor coning for a 25 MW downwind offshore wind turbine

Journal Article · · Journal of Physics. Conference Series
 [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Univ. of Texas at Dallas, Richardson, TX (United States)
  5. Univ. of Illinois at Urbana-Champaign, IL (United States)
  6. Floating Wind Technology Company, LLC, Arvada, CO (United States)
+ Show Author Affiliations

A two-bladed downwind turbine system was upscaled from 13.2 MW to 25 MW by redesigning aerodynamics, structures, and controls. In particular, three 25-MW rotors were developed, and the final version is a fully redesigned model of the original rotor. Despite their radically large sizes, it was found that these 25-MW turbine rotors satisfy this limited set of structural design drivers at the rated condition and that larger blade lengths are possible with conewise load-alignment. In addition, flapwise morphing (varying the cone angle with a wind-speed schedule) was investigated to minimize mean and fluctuating blade root bending loads using steady inflow proxies for the maximum and lifetime damage equivalent load moments. Compared to the fixed coned rotor case, morphing can provide an Annual Energy Production (AEP) increase of 6%, and the maximum blade root flapwise bending moment increases 21% (still under the constraint, i.e., 10% of the ultimate moments) as a trade-off. The resulting series of 25-MW rotors can be a valuable baseline for further development and assessment of ultra-large-scale wind turbines.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); Palmer Endowed Chair Professorship
Grant/Contract Number:
AC36-08GO28308; AR0000667
OSTI ID:
1874234
Report Number(s):
NREL/JA-5000-82040; MainId:82813; UUID:d9f5f093-4adb-4680-9081-d7c215c0db33; MainAdminID:64077
Journal Information:
Journal of Physics. Conference Series, Journal Name: Journal of Physics. Conference Series Journal Issue: 3 Vol. 2265; ISSN 1742-6588
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

A morphing downwind-aligned rotor concept based on a 13-MW wind turbine: A morphing downwind-aligned wind turbine rotor concept journal May 2015
Constrained power reference control for wind turbines journal December 2021
Control co-design of 13 MW downwind two-bladed rotors to achieve 25% reduction in levelized cost of wind energy journal January 2021
Downwind coning concept rotor for a 25 MW offshore wind turbine journal August 2020
Structural design and optimization of a series of 13.2 MW downwind rotors journal January 2021
System-level design studies for large rotors journal January 2019
Automatic controller tuning using a zeroth-order optimization algorithm journal January 2020

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Related Subjects

17 WIND ENERGY
25 MW design
downwind turbine model
offshore wind energy
upscaling