Measurement procedures for characterization of wind turbine wakes with scanning Doppler wind LiDARs
Measurement procedures for characterization of wind turbine wakes with scanning Doppler wind LiDARs
复制标题
使用扫描多普勒测风激光雷达表征风力涡轮机尾流的测量程序
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
F. Porté
中科院分区：
文献类型：
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作者：
G. Iungo;F. Porté
抽象的。利用三台扫描多普勒风激光雷达对Enercon E-70风力机尾迹流进行了研究。一台激光雷达被部署在上风向以表征来袭风，而另外两台激光雷达则位于下游进行尾流测量。执行风力涡轮机尾迹测量的主要挑战是风况的变化，以及随之而来的对涡轮机偏航角的调整，以最大限度地提高发电量。因此，考虑到激光雷达测量体积和尾迹位置之间可能存在的相对位置的变化，采用了不同的测量技术来进行平均尾迹速度场的二维和三维表征。然而，更大的测量体积和更高的空间分辨率需要更长的采样周期；因此，为了研究尾迹湍流，还进行了以固定方向和最大采样频率凝视激光的尾迹湍流测试。对顺风方向的尾迹恢复进行了表征。此外，在涡轮机顶端高度检测到尾迹湍流峰值，这可能代表风电场内下游风力涡轮机疲劳负荷的增加。
Abstract. The wake flow produced from an Enercon E-70 wind turbine is investigated through three scanning Doppler wind LiDARs. One LiDAR is deployed upwind to characterize the incoming wind, while the other two LiDARs are located downstream to carry out wake measurements. The main challenge in performing measurements of wind turbine wakes is represented by the varying wind conditions, and by the consequent adjustments of the turbine yaw angle needed to maximize power production. Consequently, taking into account possible variations of the relative position between the LiDAR measurement volume and wake location, different measuring techniques were carried out in order to perform 2-D and 3-D characterizations of the mean wake velocity field. However, larger measurement volumes and higher spatial resolution require longer sampling periods; thus, to investigate wake turbulence tests were also performed by staring the LiDAR laser beam over fixed directions and with the maximum sampling frequency. The characterization of the wake recovery along the downwind direction is performed. Moreover, wake turbulence peaks are detected at turbine top-tip height, which can represent increased fatigue loads for downstream wind turbines within a wind farm.