海上风电场激光雷达尾流测试分析

Wake measurement and analysis of offshore wind farm based on scanning lidar

针对海上风电场中尾流风速衰减恢复缓慢、影响范围远的特点,为解决目前海上风电场前期规划设计中的机位排布和后期运行优化阶段无法客观评估真实尾流影响大小及范围的问题,设计海上风电场激光雷达尾流测试结合尾流模型对比验证实验。将扫描式激光雷达布放在海上风电机组塔筒基础平台上,采用PPI探测模式获得风电机组尾流数据,根据激光雷达不同俯仰角的PPI扫描数据特点进行尾流模型数据匹配提取和对比分析,实现多模型、不同高度层的数据对比验证和研究分析。结果表明海上风电机组尾流水平风速衰减呈高斯分布,不同高度层和来流风况条件下Park-Gauss模型对尾流风速的预测与实测数据吻合度均较高,对尾流边界的定位准确可靠,可作为大型海上风电场机位排布优化及尾流控制分析的参考尾流模型。

In view of the characteristics of slow attenuation and recovery of wake wind speed and long influence range in offshore wind farms,the lidar wake test of offshore wind farm is designed,combined with the comparative verification experiment of wake model to solve the problem that it is impossible to objectively evaluate the size and scope of the real wake impact in the early stage planning and design of offshore wind farms and in the later stage of operation optimization.The scanning lidar is arranged on the tower foundation platform of offshore wind turbine,and the PPI detection mode is used to obtain the wake data of wind turbine.Combined with the characteristics of PPI scanning data of lidar at different pitch angles,the wake model data matching,extraction and comparative analysis are carried out to realize the data comparison,verification,research and analysis of multiple models and different altitudes.The results show that the horizontal wind speed of the wake of offshore wind turbines presents a Gaussian distribution.Under the conditions of different height layers and incoming wind conditions,the Park-Gauss model has a high consistency between the prediction of the wake wind speed and the measured data,and the positioning of the wake boundary is accurate and reliable. It can be used as a reference wake model for the layout optimization and wake control analysis oflarge offshore wind farms.