Design considerations for tension leg platform wind turbines

Bachynski, Erin Elizabeth; Moan, Torgeir

doi:10.1016/j.marstruc.2012.09.001

Cited by 177 publications

(125 citation statements)

References 21 publications

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“…A 5 MW Darrieus rotor was mounted on three platforms: the OC3 Hywind spar (Jonkman, 2010), the OC4 DeepCwind semi-submersible (Robertson et al, 2012), and a TLP design by Bachynski and Moan (2012). Fully coupled time domain simulations were carried out using the SIMO-RIFLEX-DMS code, which is an aero-hydro-servo-elastic computational code.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of Three Floating Wind Turbine Concepts with a Two-Bladed Darrieus Rotor

Cheng¹,

Wang²,

Gao³

et al. 2015

JOWE

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Recently, interest in the development of floating vertical axis wind turbines (FVAWTs) has been increasing, since FVAWTs might prove to be one of the optimal configurations in deep waters. In this study, a FVAWT with a 5 MW Darrieus rotor was used as the reference wind turbine and was mounted on three different floating support structures: the OC3 spar buoy, the OC4 semi-submersible, and a tension leg platform (TLP). Fully coupled nonlinear time domain simulations using the code SIMO-RIFLEX-DMS were conducted. A series of load cases with turbulent wind and irregular waves was carried out to investigate the dynamic responses of these three FVAWT concepts by estimating the generator power production, the platform motions, the tower base bending moments, and the mooring line loads. For the spar, semi-submersible, and TLP FVAWT concepts, twice-per-revolution (2P) effects resulting from the 2P aerodynamic loads are prominent in the dynamic responses of these concepts. Because of the compliant catenary mooring systems, the spar and the semisubmersible can help to mitigate the 2P effects on structural loads and mooring line tensions as compared to the TLP concept, at the cost of larger platform motions. The TLP is not a good substructure for a vertical axis wind turbine unless the cyclic variation of aerodynamic loads is significantly reduced.

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Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of Three Floating Wind Turbine Concepts with a Two-Bladed Darrieus Rotor

Cheng¹,

Wang²,

Gao³

et al. 2015

JOWE

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“…Table 6 is shown by comparing the key features of KAIST and other floating wind turbine model. Relatively well-known models like, NREL MIT TLP (Matha, 2010),Five models of Bachynski and Moan (2012) and Wang and Fan (2013) model were compared with the KAIST model. All these models are 5MW offshore floating wind turbine of TLP type.…”

Section: Resultsmentioning

confidence: 99%

“…Matha(2010) analyzed and compared the motion performance of the TLP, barge, and spar of floating offshore wind turbines. Bachynski and Moan(2012) analyzed various types of TLP floating offshore wind turbines. Robertson and Jonkman (2011) analyzed the dynamic response of barge, semi-submersible, TLP, and spar types of floating offshore wind turbines.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study of A TLP Type Floating Wind Turbine with Spoke Platform

Kim¹,

Kim²,

Kim³

et al. 2016

Journal of Advanced Research in Ocean Engineering

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As the demand for renewable energy has increased following the worldwide agreement to act against global climate change and disaster, large-scale floating offshore wind systems have become a more viable solution. However, the cost of the whole system is still too high for practical realization. To make the cost of a floating wind system be more economical, a new concept of tension leg platform (TLP) type ocean floating wind system has been developed. To verify the performance of a 5-MW TLP type ocean floating wind power system designed by the Korea Advanced Institute of Science and Technology, the FAST simulation developed by the National Renewable Energy Laboratory is used. Further, 1/50 scale model tests have been carried out in the ocean engineering tank of the Research Institute of Medium and Small Shipbuilding, Korea. This paper compares the simulation and ocean engineering tank test results on motion prediction and tension assessment of the TLP anchor.

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“…At the other end of the spectrum are taut mooring systems for tension-leg platforms (TLPs) using steel wire, which are one of the proposed solutions for floating offshore wind installations [6,7]. The compliance of these systems is minimal and very high MBLs are required to satisfy item 1 (survivability).…”

Section: Introductionmentioning

confidence: 99%

A Novel Mooring Tether for Highly-Dynamic Offshore Applications; Mitigating Peak and Fatigue Loads via Selectable Axial Stiffness

Gordelier

Parish

Thies

et al. 2015

JMSE

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Highly-dynamic floating bodies such as wave energy convertors require mooring lines with particular mechanical properties; the mooring system must achieve adequate station keeping whilst controlling mooring tensions within acceptable limits. Optimised compliant mooring systems can meet these requirements but where compliance is achieved through system architecture, the complexity of the system increases together with the mooring footprint. This work introduces the "Exeter Tether", a novel fibre rope mooring tether providing advantages over conventional fibre ropes. The tether concept aims to provide a significantly lower axial stiffness by de-coupling this attribute from the minimum breaking load of the line. A benefit of reduced axial stiffness is the reduction of mooring system stiffness providing a reduction of peak and fatigue loads, without increasing mooring system complexity. Reducing these loads improves system reliability and allows a reduction in mass of both the mooring system and the floating body, thus reducing costs. The principles behind the novel tether design are presented here, along with an outline of eight prototype tether variants. Results from the proof of concept study are given together with preliminary findings from sea trials conducted in Falmouth Bay. Results demonstrate that the Exeter Tether can be configured to achieve a significantly lower axial stiffness than conventional OPEN ACCESS J. Mar. Sci. Eng. 2015, 3 1288 fibre rope and that the stiffness is selectable within limits for a given breaking strength. Strain values greater than 0.35 are achieved at 30% of line breaking strength; this represents more than a threefold increase of the strain achievable with a conventional rope of the same material. The tether was subjected to six months of sea trials to establish any threats to its own reliability and to inform future design enhancements in this respect.

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Design considerations for tension leg platform wind turbines

Cited by 177 publications

References 21 publications

Dynamic Response Analysis of Three Floating Wind Turbine Concepts with a Two-Bladed Darrieus Rotor

Dynamic Response Analysis of Three Floating Wind Turbine Concepts with a Two-Bladed Darrieus Rotor

Simulation and Experimental Study of A TLP Type Floating Wind Turbine with Spoke Platform

A Novel Mooring Tether for Highly-Dynamic Offshore Applications; Mitigating Peak and Fatigue Loads via Selectable Axial Stiffness

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