尾流效应下偏航对风电机组功率的影响

尾流效应严重降低风电机组的功率输出。目前解决尾流效应的主要方法是优化风场布局,这对于已建成的风电场而言是不现实的。相比之下,偏航控制可以使尾流发生偏移,降低尾流效应的影响、提升机组发电能力。文章采用两台激光雷达测风仪和SCADA系统,在某风场开展实验。以此为基础,文章分析了机组不同位置流场特性。根据尾流偏移的原理,分析了不同偏航角度下,两台机组总功率的变化情况。结果表明:对于实验的两台机组来说,偏航不超过45°时能有效提高两台机组的总体输出功率,最大增幅约17.6%。可见,上游风机偏航虽然降低了自身发电功率,但其尾迹偏移能有效提高下游风机的输出功率,可以在风电场应用。

The influence of yaw on wind turbine power under wake effect

The wake effect seriously reduces the power output of wind turbines. At present, the main method to solve the wake effect is to optimize the wind field layout, which is unrealistic for the wind farms already built. In contrast, yaw control can make the wake offset to reduce the influence of wake effect and improve the generating capacity of the unit. In this paper, two lidar wind meters and SCADA system are used to carry out experiments in a wind field. Based on this, the flow field characteristics at different positions of the unit are analyzed. According to the principle of wake drift, the change of the total power of two turbines under different yaw angles is analyzed. The results show that the total output power of the unit can be effectively increased when the yaw does not exceed 45, with the maximum increase of about 13.5%. It can be seen that although the yaw of the upstream turbine reduces its own power generation, but its wake deviation can effectively improve the output power of the downstream turbine. This scheme can be applied in wind farm..