Study on the Hydrodynamic Response of Semi-Submersible Wind Turbine Platform With Different Types of Mooring System
- Chaohe Chen (South China University of Technology) | Xinkuan Yan (South China University of Technology) | Fuyong Liu (South China University of Technology) | Guoliang Pang (South China University of Technology) | Xiaochen Li (South China University of Technology) | Tianhui Fan (South China University of Technology)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- semi-submersible wind turbine platform, mooring system types, hydrodynamic response
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- 30 since 2007
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The mooring system is a key component connecting a floating wind turbine to the seabed. For floating structures, the horizontal motions are crucial. The design of a mooring system is required to maintain the floating wind turbine within a certain radius. The low frequency (LF) excitation caused by the irregular wave may induce large resonant motion responses of a floating wind turbine. As we know, the natural frequency of a floating wind turbine is mainly depended by the static restoring force of the mooring system connected with the floating wind turbine. Besides, the mooring-induced damping could play an important role when the resonant motion happens. Thus, the mooring system selection can have significant influences for station keeping and rotational oscillation control of a floating wind turbine.
In this paper, considering a semi-submersible wind turbine worked in the South China Sea, the dynamic responses of the wind turbine platform and the effects of three types of mooring systems with the same cost are studied. Different mooring patterns with eight identical chain cables are considered. The platform motions are influenced by the combined effects of waves and the mooring system. Therefore, in this study, the platform motion responses are analyzed by nonlinear coupled method in time-domain. Besides, the hydrodynamics of the wind turbine platform are simulated by three-dimensional potential theory, and the hydrodynamic forces on the mooring system are calculated by Morison's equation.
Through the numerical simulations, the time-domain and frequency-domain responses of the semi-submersible wind turbine platform are investigated. The influence of different mooring system types on the hydrodynamic response of the semi-submersible wind turbine platform are compared and analyzed. The conclusions of this study could serve as a reference for the development of semi-submersible wind turbines in the South China Sea.
The environmental benefits cover a wide spectrum of issues, such as atmospheric pollution, soil pollution, water pollution, nuclear pollution but the biggest issue by far has now become global warming. Since then interest in renewable sources has been primarily related to a benign effect on the environment. In renewable power generation, wind energy has been noted as the fastest-growing energy technology in the world (Hansen & Hansen, 2010), and floating offshore wind turbines (FOWT) have received considerable interest.
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