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中文摘要：
运用非定常叶素动量（BEM）理论计算气动载荷,叠加重力载荷和惯性载荷,建立并数值求解全机动力学模型。基于快速非支配排序遗传算法（NSGA）,在切出风速以上,优化得到变速变桨和定速变桨两种控制规律曲线,实现大型风力机在25m/s-40m/s风速之间正常运行的目的。比较两种控制策略的输出功率、风轮推力和转矩,得出变速变桨控制策略更适合于25m/s-40m/s之间风力机运行控制的结论。计算稳态工况时8种叶根载荷的极限值,由各载荷的变化趋势可知,Fy在25m/s之后增大9%,其他载荷均安全。
英文摘要：
The dynamic equation of wind turbines,in which the blade loads including the unsteady aerodynamic loads by using the blade element momentum（BEM）theory,the gravity loads and the inertial loads,is developed.The variable-speed variable-pitch and the constant-speed variable-pitch control strategies are studied for operation of the large-scale wind turbines above cut-out wind speeds.The pitch angle and rotor speed regular curves from 25 m/s to 40 m/s are obtained based on the fast and elitist non-dominated sorting genetic algorithm（NSGA）.From the output electric power,rotor thrust and low speed shaft torque,it is clear that the variable-speed variable-pitch control strategy is more suitable for the wind turbine above cut-out wind speeds.Eight types of blade root ultimate loads under the steady cases are predicted.Fyincreases by 9% and other loads are safe by observing their variation trends.
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