초대형 부유식 해상풍력터빈 타워 공진 회피 전략
Strategy to avoid tower resonance for large floating offshore wind turbines
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초록
The rapid growth of floating offshore wind turbines (FOWTs) has positioned them as a crucial technology for harnessing deep-sea wind resources. However, as turbine sizes grow to 20 MW and beyond, new technical challenges arise, particularly concerning tower resonance. This paper proposes a strategy to avoid tower resonance in such large-scale FOWTs by adopting a two-bladed rotor design. The blade passing frequencies of the two-bladed configuration are shifted away from the tower's natural frequency, thereby avoiding resonance and reducing the associated fatigue loads on the tower. Using the IEA 22 MW reference wind turbine as a case study, simulations demonstrate the effectiveness of the strategy in reducing fatigue loads on the tower by avoiding tower resonance. This strategy has the potential to significantly contribute to the structural stability and economic viability of large-scale floating offshore wind turbine towers and is expected to be a promising alternative for future ultra-large FOWTs as a substitute for the traditional three-bladed design.
Abstract
The rapid growth of floating offshore wind turbines (FOWTs) has positioned them as a crucial technology for harnessing deep-sea wind resources. However, as turbine sizes grow to 20 MW and beyond, new technical challenges arise, particularly concerning tower resonance. This paper proposes a strategy to avoid tower resonance in such large-scale FOWTs by adopting a two-bladed rotor design. The blade passing frequencies of the two-bladed configuration are shifted away from the tower's natural frequency, thereby avoiding resonance and reducing the associated fatigue loads on the tower. Using the IEA 22 MW reference wind turbine as a case study, simulations demonstrate the effectiveness of the strategy in reducing fatigue loads on the tower by avoiding tower resonance. This strategy has the potential to significantly contribute to the structural stability and economic viability of large-scale floating offshore wind turbine towers and is expected to be a promising alternative for future ultra-large FOWTs as a substitute for the traditional three-bladed design.
참고문헌 (11)
- Darwish, A. S, "Floating Offshore Wind Technology Development: Current State and Future Vision. In Sustainable Energy Development and Innovation: Selected Papers from the World Renewable Energy Congress (WREC) 2020", pp.651~659 (2022), Springer International Publishing
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- Licari, J., "Investigation of a speed exclusion zone to prevent tower resonance in variable-speed wind turbines", IEEE Transactions on Sustainable Energy, 4(4), pp.977~984 (2013)
- Definition of the IEA Wind 22-Megawatt Offshore Reference Wind Turbine, "Zahle, F.", National Renewable Energy Laboratory (NREL), ~, pp.No. NREL (2024), TP-5000-88593
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- International Electrotechnical Commission, "IEC 61400-3-2: Wind energy generation systems - Part 3-2: Design requirements for floating offshore wind turbines", IEC, ~ (2019)
- Pao, L. Y., "Control co-design of 13 MW downwind two-bladed rotors to achieve 25%reduction in levelized cost of wind energy", Annual Reviews in Control, 51, pp.331~343 (2021)
- Zalkind, D. S., "A harmonic model for loads analysis and control design of a 2-bladed wind turbine", AIAA Scitech 2019Forum, pp.1801~ (2019)