Testing and validation of multi‐lidar scanning strategies for wind energy applications
Testing and validation of multi‐lidar scanning strategies for wind energy applications
复制标题
风能应用多激光雷达扫描策略的测试和验证
DOI：
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发表时间：
2016
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通讯作者：
R. Newsom
中科院分区：
文献类型：
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作者：
J. Newman;J. Newman;T. Bonin;T. Bonin;P. Klein;S. Wharton;R. Newsom
有几个因素导致激光雷达测量的湍流值与塔上的风速计不同，包括体积平均、仪器噪声以及使用扫描圈来估计风场。避免使用扫描圈的一种方法是部署多个扫描激光雷达，并将它们指向空间中的同一体积，以收集速度测量值并提取高分辨率湍流信息。本文探讨了使用两种多激光雷达扫描策略（三多普勒技术和虚拟塔技术）来测量三维湍流。 2013 年夏季，一台垂直剖面 Leosphere WindCube 激光雷达和三台 Halo Photonics Streamline 激光雷达在南部大平原大气辐射测量站点运行，以测试这些多激光雷达扫描策略。在现场活动的前半段，所有三个扫描激光雷达都指向空间中的大致同一点，并完成三多普勒分析以计算每秒的三维风矢量。接下来，所有三个扫描激光雷达都被用来在 WindCube 激光雷达上方建造一座“虚拟塔”。结果表明，在稳定大气条件下，三多普勒技术比 WindCube 激光雷达测量更高的水平湍流值，减少不稳定条件下的方差污染，并且可以测量平均风速和风向的高分辨率剖面。虚拟塔技术在稳定条件下提供了足够的湍流信息，但由于重新调整扫描需要时间，因此无法捕获不稳定条件下经历的湍流的完整时间变化。版权所有 © 2016 约翰·威利父子有限公司
Several factors cause lidars to measure different values of turbulence than an anemometer on a tower, including volume averaging, instrument noise and the use of a scanning circle to estimate the wind field. One way to avoid the use of a scanning circle is to deploy multiple scanning lidars and point them toward the same volume in space to collect velocity measurements and extract high-resolution turbulence information. This paper explores the use of two multi-lidar scanning strategies, the tri-Doppler technique and the virtual tower technique, for measuring 3-D turbulence. In summer 2013, a vertically profiling Leosphere WindCube lidar and three Halo Photonics Streamline lidars were operated at the Southern Great Plains Atmospheric Radiation Measurement site to test these multi-lidar scanning strategies. During the first half of the field campaign, all three scanning lidars were pointed at approximately the same point in space and a tri-Doppler analysis was completed to calculate the three-dimensional wind vector every second. Next, all three scanning lidars were used to build a ‘virtual tower’ above the WindCube lidar. Results indicate that the tri-Doppler technique measures higher values of horizontal turbulence than the WindCube lidar under stable atmospheric conditions, reduces variance contamination under unstable conditions and can measure high-resolution profiles of mean wind speed and direction. The virtual tower technique provides adequate turbulence information under stable conditions but cannot capture the full temporal variability of turbulence experienced under unstable conditions because of the time needed to readjust the scans. Copyright © 2016 John Wiley & Sons, Ltd.