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Collaborating Authors
Design And Analysis of Box-type Floating Wind Turbine Structures With Large Motion Damping Plates
Hong, Sa Young (Maritime and Ocean Engineering Research Institute (MOERI)) | Kim, Jin Ha (Maritime and Ocean Engineering Research Institute (MOERI)) | Kim, Hyun Joe (Daedeok Ship R&D Center, SSMB, Samsung Heavy Industries, Co., Ltd.)
ABSTRACT : A box-type floating structure is considered for a candidate of floating wind turbine structures. The platform is consisted of a box structure and large damping plates for enhancing global performance characteristics. Numerical analysis is conducted by using higher-order boundary element method. The numerical results were validated through a series of convergence test and model tests data. The global performance of the model structure is compared with same class spar-type structure. Finally technical feasibility of the structure is discussed considering construction cost and installation procedure. INTRODUCTION Offshore floating wind turbine has been paid attention due to better quality of offshore wind and a large amount of potential source in deeper water region. Due to more powerful and high quality offshore wind resources than those on lands and less environmental issues associated with noise and view, floating offshore wind farm will be more popular and dominant solutions for utilizing wind energy(Hong et al., 2012). There is three types of floating structures being considered for floating wind tower substructures; a spar type structure, TLP type and semisubmersible platforms(Justin Wilkes et al., 2012). Blue H which has 80 kW floating wind turbine installed at 113 km off the coast of Italy was the first pilot utilizing tension-leg platform design. The first large-capacity, 2.3 megawatt floating wind turbine is Hywind spar, which was installed in the North Sea off of Norway. In October 2011, Principle Power" s WindFloat Prototype was installed 4km offshore of Aguçadoura, Portugal fitted with a 2.0MW offshore wind turbine is the first offshore wind turbine installed in open Atlantic waters and make use of a semi-submersible type floating foundation. Those three concepts have long been adopted for deepwater oil production platform successfully due to their excellent global performance in waves.
ABSTRACT An experimental study on the motion of a scale model of SPAR-type floating offshore platform is presented in this paper. A Froude scaled model at 100:1 scale for 5MW wind turbine system is tested in a wave tank. A Measurement system including infrared vision system and MEMS inertial sensors is applied to the measurement of three dimensional linear and angular motions and mooring line tensions. The effect of test conditions such as center of mass and mooring system's stiffness and fairlead location on the model's motion in response to regular waves is investigated.
Aero-Elastic-Control-Floater-Mooring Coupled Dynamic Analysis of Floating Offshore Wind Turbines
Bae, Y.H. (Department of Civil Engineering, Texas A&M University) | Kim, M.H. (Department of Civil Engineering, Texas A&M University) | Im, S.W. (Steel Structure Research Laboratory, Research Institute of Industrial Science & Technology (RIST)) | Chang, I.H. (Steel Structure Research Laboratory, Research Institute of Industrial Science & Technology (RIST))
ABSTRACT: In the present study, a numerical prediction tool has been developed for the fully coupled dynamic analysis of a FOWT (floating offshore wind turbine) in time domain including aero-loading, blade-rotor dynamics and control, tower elastic responses, mooring dynamics, and platform motions so that their dynamic coupling effects can fully be assessed. In this regard, Hywind spar design with 5MW turbine is selected as an example. In case of the spar-type floater, it is seen that the maximum offsets and mooring tensions of the coupled analyses are smaller than those of uncoupled analyses. It is also seen that the maximum accelerations at the tower are significantly increased due to the coupling between tower elastic modes and hull 6DOF motions, which will in turn greatly affect the corresponding inertial loading on nacelle and blades. The developed technology and numerical tool are readily applicable to the design of any new offshore floating wind farms in any combinations of irregular waves, dynamic winds, and steady currents. INTRODUCTION Wind is the fastest growing clean and renewable energy source. Until recently, most of the wind-farm development has been limited to the land space and shallow water regions. Recently, several countries started to plan offshore floating wind farms. Although they are considered to be more difficult to design, wind farms in deeper waters are in general less sensitive to space availability, noise restriction, visual pollution, and regulatory problems. They are also exposed to much stronger and steadier wind field to be more effective. Furthermore, in designing those floating wind farms, the existing technology and experience of offshore petroleum industry is directly applicable. In this regard, if technology and infrastructure is fully developed, offshore floating wind farms are expected to produce huge amount of clean electricity at a competitive price compared to other energy sources.
- Europe (0.68)
- Asia (0.68)
- North America > United States > Texas (0.28)
ABSTRACT: A large number of offshore wind farms with fixed foundations have been installed in Europe with relatively state-of-the-art techniques. However the installation of floating wind farms in deeper water is encouraged by the stronger and steadier winds, the lower visibility, the absence of ship lanes restrictions and the economic potential. Compared to a fixed foundation, a floating offshore wind turbine (FOWT) may sustain more complicated environmental conditions including stochastic winds and waves. One of the FOWT concepts was designed and analyzed. It consists of a three bladed 5-MW up wind turbine, which is the basic model under the IEA Annex 23 Subtask 2 Offshore Code Comparison Collaboration (OC3) project, and supported by an OC3-Hywind spar buoy platform. The platform is connected by three mooring lines to the sea bed. To study motion characteristics of the OC3-Hywind platform, a model was built with a 1/128 scale ratio. The model test was carried out in various sea states, including rotating rotor effect with wind in the Ocean Engineering Wide Tank of the University Of Ulsan (UOU). The characteristic motions of the OC3- Hywind platform were captured and the RAO and significant motion were obtained. INTRODUCTION With worldwide environmental regulations and sudden fluctuations in oil prices, the development of alternative energy to fossil fuel begins in earnest. The Korean government suggested ‘Low Carbon Green Growth’ as a new vision and the latest paradigm of national development. Korea, whose dependence on overseas energy is about 97%, chose the development of green energy as a national project. Especially because they give an impetus to floating wind power generation, we expect that our industrialization will accelerate rapidly. Normally offshore wind turbines receive better wind quality in deepwater than shallow water. Presently, most of offshore wind turbine installations are fixed support structures in shallow water.
- Asia > South Korea > Ulsan > Ulsan (0.25)
- Europe (0.24)
Influence of Control Strategy to FOWT Hull Motions By Aero-Elastic-Control-Floater-Mooring Coupled Dynamic Analysis
Bae, Y.H. (Department of Civil Engineering, Texas A&M University) | Kim, M.H. (Department of Civil Engineering, Texas A&M University) | Yu, Q. (American Bureau of Shipping) | Kim, K. (American Bureau of Shipping)
ABSTRACT: More FOWTs (floating offshore wind turbines) will be installed as relevant regulations and technological hurdles are removed in the coming years. In the present study, a numerical prediction tool has been developed for the fully coupled dynamic analysis of FOWTs in time domain including aero-loading, tower elasticity, blade-rotor dynamics and control, mooring dynamics, and platform motions so that the influence of rotor-control dynamics on the hull-mooring performance and vice versa can be assessed. The developed coupled analysis program is applied to Hywind spar design with 5MW turbine. In case of spar-type floaters, the control strategy significantly influences the hull and mooring dynamics due to the possibility of control-induced instability causing resonant hull motions. Therefore, it is important to use a control strategy without such problems at the penalty of possibly less uniform power outputs. In this regard, the results of two different control strategies - conventional and modified control strategies - are systematically compared to better understand the subtle coupling effects between the blade-pitch-angle-control and hull motions. The developed technology and numerical tool are readily applicable to any types of floating wind farms in any combinations of irregular waves, dynamic winds, and steady currents. INTRODUCTION Wind is the fastest-growing clean and renewable energy source. Until recently, most of the wind-farm development has been limited to the land space or shallow-water areas. However, there exist negative features of on-land wind farms that include lack of available space, noise restriction, shade, visual pollution, limited accessibility in mountainous areas, community opposition, and regulatory problems. In this regard, several countries started to plan floating offshore wind farms. Although they are considered to be more difficult to design, wind farms in deeper waters are in general less sensitive to space availability, noise restriction, visual pollution, and regulatory problems.
- Europe (0.68)
- North America > United States > Texas (0.28)