臺灣能源期刊第10卷第1期-臺灣能源期刊論文全文-能源期刊-能源知識庫

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臺灣能源期刊論文全文

出刊日期：March, 2023

Title: Dynamic Analysis of Giant Floating Offshore Wind Turbine under Extreme Operation Gust Condition

摘要: 本研究參考DTU 10 MW參考風機與LIFES50+ OO-star半潛式浮動載台之計算模型，以及參考 IEC 61400-3-2的極端運轉陣風風況模型，並應用NREL FAST v8.16進行動態載重計算，再由主軸與轉向軸承的極限載重結果進行動態分析。根據計算結果顯示，EOG風況的風速驟變特性，使得風機轉速變化在短時間內相當不穩定，造成極限載重計算結果皆有發生過轉速的情況。主軸與轉向軸承零組件受到切出風速的極端陣風影響下，皆發生極限彎矩載重案例，而受到與載台縱移與縱搖自然週期接近的陣風週期影響，分別使主軸與轉向軸承發生最大推力及軸向力的載重案例，並影響發電量最大達到34.6%。建議國內未來開發浮動載台時，應特別針對浮動載台縱搖運動方向之特性，進行結構設計與穩度調控，尤其是未來風機大型化後，浮動載台自然週期將會增加，更容易受到長週期陣風的影響。

Abatract: This paper presents the dynamic analysis of a floating offshore wind turbine (FOWT) consisting of DTU 10 MW reference wind turbine (RWT) and the substructure of LIFES50+ OO-star semi-submersible platform. The extreme loads on the main shaft and yaw bearing under the extreme operation gust (EOG) model as defined in IEC 61400-3-2 were calculated using the FAST v8.16 software developed by NREL. The simulation results showed that the rotor speed was quite unstable due to drastic changes in wind speed of the EOG model. Also, the overspeed situations occurred in all of the extreme load calculation cases. The extreme bending moment load cases of the main shaft and yaw bearing were found under the cut-out wind speed of the EOG model. The extreme load cases of the main shaft (thrust) and yaw bearing (axial force) occurred owing to the gust period close to respectively the natural periods in surge and pitch of the floating platform, which had an effect on the power generation up to 36.4%. The effect of long-period gust will be significant as the natural period of the floating platform increases with the growth of wind turbine size in the future. It is suggested that the characteristics of the pitching motion of the floating platform should be taken into account in the structure design and stability regulation.

Keywords: Extreme operation gust, IEC 61400-3-2, DTU 10 MW reference wind turbine, LIFES50+ OO-star, semi-submersible platform.