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Research Papers

Alternative Mooring Systems for a Very Large Offshore Wind Turbine Supported by a Semisubmersible Floating Platform

[+] Author and Article Information
Jinsong Liu

Department of Civil, Architectural
and Environmental Engineering,
University of Texas at Austin,
Austin, TX 78712
e-mail: Jinsongliu@utexas.edu

Lance Manuel

Professor
Department of Civil, Architectural
and Environmental Engineering,
University of Texas at Austin,
Austin, TX 78712
e-mail: lmanuel@mail.utexas.edu

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received June 14, 2017; final manuscript received March 31, 2018; published online May 7, 2018. Assoc. Editor: Douglas Cairns.

J. Sol. Energy Eng 140(5), 051003 (May 07, 2018) (9 pages) Paper No: SOL-17-1231; doi: 10.1115/1.4039984 History: Received June 14, 2017; Revised March 31, 2018

As offshore wind turbines supported on floating platforms extend to deep waters, the various effects involved in the dynamics, especially those resulting from the influence of moorings, become significant when predicting the overall integrated system response. The combined influence of waves and wind affect motions of the structure and induce tensile forces in mooring lines. The investigation of the system response under misaligned wind-wave conditions and the selection of appropriate mooring systems to minimize the turbine, tower, and mooring system loads is the subject of this study. We estimate the 50-year return response of a semisubmersible platform supporting a 13.2 MW wind turbine as well as mooring line forces when the system is exposed to four different wave headings with various environmental conditions (wind speeds and wave heights). Three different mooring system patterns are presented that include 3 or 6 mooring lines with different interline angles. Performance comparisons of the integrated systems may be used to define an optimal system for the selected large wind turbine.

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Figures

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Fig. 3

Top view of wind-wave misalignment condition

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Fig. 2

Three alternative mooring line configurations (diameter in meters)

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Fig. 1

Integrated SNL semisubmersible wind turbine model: (a) three-dimensional (3D) View and (b) 2D View

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Fig. 4

Fifty-year ECs: (a) 3D EC and (b) 2D EC

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Fig. 5

Fifty-year return period tower base bending moments (left vertical axes, darker lines) and measures of uncertainty (right vertical axes, lighter lines) for different wind-wave misalignments and for different mooring systems: (a) SNL300, (b) SNL630, (c) SNL660, (d) SNL300, (e) SNL630, and (f) SNL660

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