大气边界层与风力发电的相互作用是近年来的新兴研究热点,具有重要科学意义和高度应用价值。一方面,大气边界层的风切变现象可导致风电机组的输出功率减小、机械载荷增大;湍流现象在低(高)风速段导致机组的输出功率增大(减小),但对机械载荷具有单调增大的影响;大气边界层具有显著的日变化规律,层结状态的改变影响着地面风场的结构和特性,并导致风电机组的输出功率和机械载荷随之发生变化。另一方面,风电机组的叶轮旋转施加了扰动效应,导致下风向的风速减小、湍流增大,并且具有复杂空间分布特征;而大型风电场或风电基地产生的巨大扰动效应可影响和改变边界层的整体结构和特性,并影响局地甚至全球气候环境。
Atmospheric boundary layer( ABL) and wind power generation( WPG) interaction has become one of the hottest research subjects in recent years,and its study has both important scientific significance and high industrial value. Beginning with introduction of WPG 's fundamentals and theories,this paper describes and discusses principles and mechanisms of ABL and WPG interaction,and also summarizes and concludes the latest study progresses in the field. The influence of ABL on WPG is mainly concerned with two aspects: The wind turbine's output power and mechanical load,which play key roles in the wind turbine's energy production and structural integrity. The Wind turbine's output power and mechanical load generally increase with wind speed,and they also were found to be affected by structure and characteristic of ABL 's ground wind field in recent studies. Due to wildly existence of wind shear phenomena in ABL,the wind turbine's output power is decreased and mechanical load is increased. Turbulence phenomena have both positive influence on the wind turbine's output power in lowwind speed section,and negative influence in high wind speed section. However,the wind turbine's mechanical load monotonically increases with turbulence intensity increasing. ABL 's stratification stability has significant diurnal variation,along with changing ground wind field's structure and characteristic( such as wind shear and turbulence),and accordingly affects wind turbines' output power and mechanical load characteristics. The mechanisms of ABL 's influence on WPG need to be further investigated,and the mathematic-physical models for practical engineering need to be established. The wind turbine absorbs wind energy by blades and rotor rotating,which accordingly exerts perturbation effect on the air flow. As a consequence,the downwind area's wind speed is decreased and turbulence is increased,and both of them were found having complex space distributions in latest studies. The so-called "wake effe