Semi-submersible wind turbine hull shape design for a favorable system response behavior |
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| Institution: | 1. Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Republic of Korea;2. Research Institute of Marine Systems Engineering, Dept. of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Republic of Korea;1. Naval Architecture and Ocean Engineering College, Dalian Maritime University, China;2. School of Naval Architecture & Ocean Engineering, Jiangsu University of Science and Technology, China;3. SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai, 200240, China;3. Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow, G4 0LZ, UK;1. Center for Ships and Ocean Structures, Norwegian University of Science and Technology, Trondheim NO-7491, Norway;2. Center for Ships and Ocean Structures, Center for Autonomous Marine Operations and Systems, Department of Marine Technology, Norwegian University of Science and Technology, Trondheim NO-7491, Norway |
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| Abstract: | Floating offshore wind turbines are a novel technology, which has reached, with the first wind farm in operation, an advanced state of development. The question of how floating wind systems can be optimized to operate smoothly in harsh wind and wave conditions is the subject of the present work. An integrated optimization was conducted, where the hull shape of a semi-submersible, as well as the wind turbine controller were varied with the goal of finding a cost-efficient design, which does not respond to wind and wave excitations, resulting in small structural fatigue and extreme loads.The optimum design was found to have a remarkably low tower-base fatigue load response and small rotor fore-aft amplitudes. Further investigations showed that the reason for the good dynamic behavior is a particularly favorable response to first-order wave loads: The floating wind turbine rotates in pitch-direction about a point close to the rotor hub and the rotor fore-aft motion is almost unaffected by the wave excitation. As a result, the power production and the blade loads are not influenced by the waves. A comparable effect was so far known for Tension Leg Platforms but not for semi-submersible wind turbines. The methodology builds on a low-order simulation model, coupled to a parametric panel code model, a detailed viscous drag model and an individually tuned blade pitch controller. The results are confirmed by the higher-fidelity model FAST. A new indicator to express the optimal behavior through a single design criterion has been developed. |
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| Keywords: | Floating wind turbine Integrated design Wave cancellation Counter-phase pitch Response Systems engineering 00–01 99-00 |
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