Constant speed horizontal axis wind turbines operate at power coefficients different than its maximum due to operation at different tip speed ratios (TSRs). Whereas rotational speed and the site wind speed distribution determine the TSR range of the operation, the pitch angle is significant for the aerodynamic performance of the wind turbine. In this paper, a blade element momentum approach is used to study the power production effects of pitch angle and rotational speed of NREL Phase VI wind turbine at different site wind distributions (characterized by Weibull distributions). It is shown that the best combination of rotational speed and pitch angle always occurs at the same pitch angle, but for different rotational speeds (other than the best one) the best pitch angle may vary. The best rotational speed is found to be dependent on both form and scale factors of Weibull wind speed distribution. Improvements in turbine pitch angle and rotational speed are found to increase generated energy up to four times, but the increasing factor is highly dependent on wind speed distribution: For the studied turbine, high-wind-speeds sites can benefit more from the adjustment of these parameters than low-speed ones.

由于以不同的叶尖速比（TSR）运行，恒速水平轴风力涡轮机的功率系数与其最大功率系数不同。尽管旋转速度和现场风速分布确定了运行的TSR范围，但俯仰角对于风力涡轮机的空气动力学性能而言非常重要。本文采用叶片动量法研究了NREL VI阶段风力发电机在不同站点风场分布（以威布尔分布为特征）的桨距角和转速的发电效应。结果表明，转速和俯仰角的最佳组合始终在相同的俯仰角处发生，但是对于不同的转速（最佳转速除外），最佳俯仰角可能会发生变化。发现最佳转速取决于威布尔风速分布的形式和比例因子。涡轮机俯仰角和转速的改善可将产生的能量最多增加四倍，但是增加的因素很大程度上取决于风速分布：对于研究的涡轮机，高风速站点可从这些调整中受益更多参数比低速的。