Concept Design and Analysis of Wind-Tracing Floating Offshore Wind Turbines

Li, Shuijin; Lamei, Azin; Hayatdavoodi, Masoud; Wong, Carlos

doi:10.1115/iowtc2019-7580

Cited by 3 publications

(5 citation statements)

References 10 publications

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“…The floater is triangular, supporting three wind turbines. A preliminary hydroelastic analysis of the wind-tracing floater is given in Lamei et al (2019) and concept design of the structure is discussed in Li et al (2019). Similarly, WindSea (Carbon Trust 2015) is a wind-tracing concept where the mooring lines are connected by a turret bearing to allow the platform to rotate and face the incoming wind, see Fig.…”

Section: Multi-unit Floater Conceptmentioning

confidence: 99%

“…6 (for water depth h = −200 m and wave height H = 1 m). For co-directional wind flow to the towers, the total aerodynamic loading on the three rotors (standard 5 MW NREL turbine) reaches up to 3 MN at rated wind speed of U W = 11.4 m/s, see Lamei et al (2019) and Li et al (2019) for more details about this structure and the calculation.…”

Section: Hydrodynamic Loadsmentioning

confidence: 99%

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On motion analysis and elastic response of floating offshore wind turbines

Lamei

Hayatdavoodi

2020

J. Ocean Eng. Mar. Energy

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Wind energy industry is expanded to offshore and deep water sites, primarily due to the stronger and more consistent wind fields. Floating offshore wind turbine (FOWT) concepts involve new engineering and scientific challenges. A combination of waves, current, and wind loads impact the structures. Often under extreme cases, and sometimes in operational conditions, magnitudes of these loads are comparable with each other. The loads and responses may be large, and simultaneous consideration of the combined environmental loads on the response of the structure is essential. Moreover, FOWTs are often large structures and the load frequencies are comparable to the structural frequencies. This requires a fluid-structure-fluid elastic analysis which adds to the complexity of the problem. Here, we present a critical review of the existing approaches that are used to (i) estimate the hydrodynamic and aerodynamic loads on FOWTs, and (ii) to determine the structures' motion and elastic responses due to the combined loads. Particular attention is given to the coupling of the loads and responses, assumptions made under each of the existing solution approaches, their limitations, and restrictions, where possible, suggestions are provided on areas where further studies are required.

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Section: Multi-unit Floater Conceptmentioning

confidence: 99%

Section: Hydrodynamic Loadsmentioning

confidence: 99%

On motion analysis and elastic response of floating offshore wind turbines

Lamei

Hayatdavoodi

2020

J. Ocean Eng. Mar. Energy

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“…Furthermore, the wind-tracing FOWT was introduced by Wong (2015) with three wind turbines and a weathervaning mechanism by turret-bearing mooring system. Preliminary analysis on its wave-induced responses and its motions to the combined wind and wave loads were reported by Lamei et al (2019) and Li et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Motion and elastic response of wind-tracing floating offshore wind turbines

Lamei

Hayatdavoodi

Riggs

2022

J. Ocean Eng. Mar. Energy

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A multi-unit floating offshore wind turbine concept, the wind-tracing floating offshore wind turbine, is introduced. In this concept, the floating structure is a triangular platform that hosts three 5 MW wind turbines and is moored to the seabed with a turret-bearing mooring system. This mooring system allows the structure to rotate about the turret such that the total yaw moment by the environmental load on the turret is minimized. In this study, the optimum properties of the mooring lines and the location of the turret are determined. To identify the preferred location of the turret, the responses of the structure to combined co-directional and misaligned wind and wave loads are computed. The motions of the structure are obtained with a frequency-domain numerical model integrated with structural finite-element method for hydroelastic and aeroelastic analyses. The hydrodynamic and aerodynamic loads are obtained by wave diffraction theory and steady blade element momentum method, respectively. Finally, with the optimum configuration of the mooring system, the motion and aero- and hydroelastic responses of the fully flexible wind-tracing floating offshore wind turbines to combined waves and wind loads are determined and discussed.

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“…The type of floating platform is selected based on the mooring system, the number of wind turbines, site requirements, construction, grid connection, and operating conditions of the sea [13]. Recently, the concept of multiple wind turbines on a floating platform has drawn attention because they are more stable and enable the use of higher towers and hence greater capture of wind energy [14][15][16][17][18][19][20][21][22][23]. The installation and mooring costs can be reduced by employing multiple wind turbines on a single platform as they can share common mooring lines [24].…”

Section: Introductionmentioning

confidence: 99%

“…Jang et al [20] showed that the heave plates with a minimal increase of mass can reduce the pitch and heave motions of a multi-unit offshore floating wind turbine. The concept of a triangular-shaped floating platform with three wind turbines at each corner was presented in [21,22] that considered only hydrodynamic loads to study the motion and elastic responses of the structure. This concept used a wind-tracing floating structure with a single-point mooring system that allows for the entire platform to rotate in response to the change of the wind direction.…”

Section: Introductionmentioning

confidence: 99%

Design and Stability Analysis of an Offshore Floating Multi-Wind Turbine Platform

Bashetty

Özçelik

2022

Inventions

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The multi-wind turbine platform technology has the potential to harness the significant source of offshore wind energy in deep waters. However, the wake interference between the turbines on the multi-wind turbine platform can cause a reduction in power production; hence, it is important to study the wake effects in the initial phase of the design. This paper studies the effects of wake interference between the wind turbines on three different platform configurations to find a suitable configuration for the wind turbines on a multi-turbine platform. The analytical Larsen wake model and computational fluid dynamics (CFD) simulations are used for evaluating the wake effects. The platform configuration required for the wind turbines is determined based on the results of wake effects, and then a novel platform is designed. The free-floating stability behavior of the multi-wind turbine platform is analyzed using the hydrostatic analysis of the modeled platform. The wave-body interaction between the platform and the waves is predicted using the hydrodynamic analysis. A preliminary cost analysis of the multi-turbine platform concept is evaluated and compared with a single wind turbine floating concept. The results showed that the presented design is a promising concept that can enhance the offshore wind industry.

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Concept Design and Analysis of Wind-Tracing Floating Offshore Wind Turbines

Cited by 3 publications

References 10 publications

On motion analysis and elastic response of floating offshore wind turbines

On motion analysis and elastic response of floating offshore wind turbines

Motion and elastic response of wind-tracing floating offshore wind turbines

Design and Stability Analysis of an Offshore Floating Multi-Wind Turbine Platform

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