Model test of new floating offshore wind turbine platforms

Shin, Hyunkyoung; Dam, Pham Thanh; Jung, Kwang Jin; Song, Jinseob; Rim, Chae-Whan; Chung, Tae-Young

doi:10.2478/ijnaoe-2013-0127

Cited by 20 publications

(9 citation statements)

References 5 publications

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“…However, the height of the tower is determined by the rotor stiffness, which should be restricted such that there is no dynamic coupling between the rotor and the tower. The present study adopts the tower of the 5 MW baseline wind turbine for the Hywind-OC3 case [34]. The base of the tower coincides with the top of the platform at an elevation of 10 m above the MSL, while the top of the tower is coincident with the yaw bearing at an elevation of 87.6 m. The nacelle of the wind turbine is a structure housing the generator and drivetrain, mounted on the tower top through yaw bearing with a certain yaw mechanism of spring and damping.…”

Section: Aerodynamics Modelingmentioning

confidence: 99%

“…where A ij and B ij are the added mass and damping coefficient, respectively. In the present study, F exc i , A ij and B ij were obtained from [32] with an indoor program, HydroGen, which can generate the same hydrodynamic outputs as WAMIT [34]. Equation 1, which includes coupled resorting terms (e.g., shown in Tables 2 and 3), is a weakly nonlinear approach based on Cummins' equation [35].…”

Section: Hydrodynamics Modelingmentioning

confidence: 99%

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Design Optimization and Coupled Dynamics Analysis of an Offshore Wind Turbine with a Single Swivel Connected Tether

Chen

2020

Energies

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The increased interest in renewable wind energy has stimulated many offshore wind turbine concepts. This paper presents a design optimization and a coupled dynamics analysis of a platform with a single tether anchored to the seabed supported for a 5 MW baseline wind turbine. The design is based on a concept named SWAY. We conduct a parametric optimization process that accounts for important design considerations in the static and dynamic view, such as the stability, natural frequency, performance requirements, and cost feasibility. Through these optimization processes, we obtain and present the optimized model. We then establish the fully coupled aero-hydro-servo-elastic model by the time-domain simulation tool FAST (Fatigue, Aerodynamics, Structures, and Turbulence) with the hydrodynamic coefficients from an indoor program HydroGen. We conduct extensive time-domain simulations with various wind and wave conditions to explore the effects of wind speed and wave significant height on the dynamic performance of the optimized SWAY model in various water depths. The swivel connection between the platform and tether is the most special design for the SWAY model. Thus, we compare the performance of models with different tether connection designs, based on the platform motions, nacelle velocity, nacelle accelerations, resonant behaviors, and the damping of the coupled systems. The results of these comparisons demonstrate the advantage of the optimized SWAY model with the swivel connection. From these analyses, we prove that the optimized SWAY model is a good candidate for deep water deployment.

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Section: Aerodynamics Modelingmentioning

confidence: 99%

Section: Hydrodynamics Modelingmentioning

confidence: 99%

Design Optimization and Coupled Dynamics Analysis of an Offshore Wind Turbine with a Single Swivel Connected Tether

Chen

2020

Energies

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“…The TLP concept is stabilized by a high-tension mooring system; for this reason, the anchor system for TLP is complex [8][9][10]. The spar concept usually uses heavy ballast materials such as concrete at the bottom to provide a lower center of gravity for stabilization [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool

Pham

Shin

2019

Energies

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Floating offshore wind turbines promise to provide an abundant source of energy. Currently, much attention is being paid to the efficient performance and the economics of floating wind systems. This paper aims to develop a spar-type platform to support a 5-MW reference wind turbine at a water depth of 150 m. The spar-type platform includes a moonpool at the center. The design optimization process is composed of three steps; the first step uses a spreadsheet to calculate the platform dimensions; the second step is a frequency domain analysis of the responses in wave conditions; and the final step is a fully coupled simulation time domain analysis to obtain the dynamic responses in combined wind, wave, and current conditions. By having a water column inside the open moonpool, the system’s dynamic responses to horizontal and rotating motions are significantly reduced. Reduction of these motions leads to a reduction in the nacelle acceleration and tower base bending moment. On the basic of optimization processes, a spar-type platform combined with a moonpool is suggested, which has good performance in both operational conditions and extreme conditions.

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“…The seakeeping performance of the OC3-Hywind platform is investigated in [4] by both numerical solution and model test method. Moreover, a series of model test researches have been performed at the same time [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analysis and real-time prediction of the full-scale thrust for floating wind turbine based on artificial intelligence

et al. 2019

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In this paper, numerous aero-hydro-servo-elastic coupled simulations are carried out in time-domain to observe the performance of the real-time thrust acting on the rotor of the OC3-Hywind offshore floating wind turbine. And the studying focuses on investigating the correlation between inputs (surge motion, pitch motion, wind conditions, etc.) and the targeted output (rotor thrust) in the time domain. Besides, artificial intelligence (AI) techniques are used to estimate a prediction model of real-time thrust based on the data from simulations. To predict the thrust, data for four comparative coupled environmental conditions are considered, by which the effect of turbulence and wave spectrum on the thrust force is also investigated. Moreover, a series of simulations of frequency-increasing regular wave conditions and speedincreasing wind conditions are carried out to observe their effect on the real-time rotor thrust. Additionally, the impact of the pitch and surge RAOs of the floating foundation and the wind velocity are quantitatively studied. It reveals that the high-frequency response of thrust is dominated by wave change, whereas low-frequency response is dominated by wind change. Besides, one simulation model of the thrust acting on the rotor is estimated regarding highfrequency and low-frequency response separately to account the dominating influence.

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Model test of new floating offshore wind turbine platforms

Cited by 20 publications

References 5 publications

Design Optimization and Coupled Dynamics Analysis of an Offshore Wind Turbine with a Single Swivel Connected Tether

Design Optimization and Coupled Dynamics Analysis of an Offshore Wind Turbine with a Single Swivel Connected Tether

A New Conceptual Design and Dynamic Analysis of a Spar-Type Offshore Wind Turbine Combined with a Moonpool

Analysis and real-time prediction of the full-scale thrust for floating wind turbine based on artificial intelligence

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