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Downwind coning concept rotor for a 25 MW offshore wind turbine

Journal Article · · Renewable Energy
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6]
  1. Univ. of Virginia, Charlottesville, VA (United States); OSTI
  2. Univ. of Virginia, Charlottesville, VA (United States)
  3. Colorado State Univ., Fort Collins, CO (United States)
  4. Univ. of Texas at Dallas, Richardson, TX (United States)
  5. Univ. of Illinois at Urbana-Champaign, IL (United States)
  6. RRD Engineering (United States)
+ Show Author Affiliations
The size of offshore wind turbines over the next decade is expected to continually increase due to reduced balance of station costs per MW and also the higher wind energy at increased altitudes that can lead to higher capacity factors. However, there are challenges that may limit the degree of upscaling which is possible. In this paper, a two-bladed downwind turbine system is upscaled from 13.2 MW to 25 MW, by redesigning aerodynamics, structures, and controls. In particular, three 25 MW rotors have been developed: V1 is the upscaled model, V2 is a partial redesigned model, and V3 is a fully redesigned model. Despite their radically large sizes, it is found that these 25 MW turbine rotors satisfy this limited set of design drivers at the rated condition and that larger blade lengths are possible with cone-wise load-alignment. In addition, flapwise morphing (varying the cone angle with a wind-speed schedule) is investigated in terms of minimizing mean and fluctuating root bending loads using steady inflow proxies for the maximum and damage equivalent load moments. The resulting series of 25 MW rotors, which are the largest ever designed, can be a useful baseline for additional development and assessment.
Research Organization:
University of Virginia, Charlottesville, VA (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000667
OSTI ID:
1799055
Alternate ID(s):
OSTI ID: 1616335
Journal Information:
Renewable Energy, Journal Name: Renewable Energy Journal Issue: C Vol. 156; ISSN 0960-1481
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (9)

A morphing downwind-aligned rotor concept based on a 13-MW wind turbine: A morphing downwind-aligned wind turbine rotor concept journal May 2015
Aeroservoelastic design definition of a 20 MW common research wind turbine model: A 20 MW common research wind turbine model journal March 2016
A review on the development of wind turbine generators across the world journal June 2013
Multidisciplinary design optimization of large wind turbines—Technical, economic, and design challenges journal September 2016
Critical review of offshore wind turbine energy production and site potential assessment journal February 2019
Pre-aligned downwind rotor for a 13.2 MW wind turbine journal February 2018
Downwind offshore wind turbines: Opportunities, trends and technical challenges journal February 2016
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
Energy & Fuels
Offshore wind energy
Science & Technology
Upscaling