白天
大气不稳定性
唤醒
环境科学
地形
大气科学
风速
气象学
黄昏
行星边界层
日循环
焊剂(冶金)
气温日变化
最大持续风
海风
湍流
气候学
风向
风梯度
地理
地质学
机械
物理
冶金
材料科学
地图学
天文
作者
Qiang Wang,Kun Luo,Chengzhi Wu,Yanfei Mu,Junyao Tan,Jianren Fan
标识
DOI:10.1016/j.enconman.2022.115897
摘要
Enhancing the power production efficiency of large-scale wind farms is challenging for onshore wind power due to the variability of atmospheric conditions. This work aims to study the impact of atmospheric stability on the inter-farm wake pattern, topographic effect, and power production changes at two neighboring wind farms in Hami City, Xinjiang of China over complex terrain. The results show a discernible diurnal cycle property. At night in a stable layer with hindered mixing, the inter-farm wake persists around 20 km downstream, and the greatest relative wind deficit increases by 8%. However, during the daytime unstable layer with elevated turbulence, shows a limited deficit and recovers about 6 km downstream. Accordingly, a mean relative power production reduction of 17% is subjected to the downwind farm at night, about a factor of 3 greater than that at daytime, when the mean value is only 6%. Interestingly, the largest power production losses are experienced with a larger range between maximum and minimum before dawn and after dusk due to the notable inter-farm wake with a streaky structure related to the large coherent buoyant caused by the tendency of heat flux over the complex terrain. Moreover, the topographic speed-up in the stable layer outperforms that in unstable conditions.
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