A method to correct for the effect of blockage and wakes on power performance measurements

IF 3.6 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
A. Sebastiani, J. Bleeg, Alfredo Peña
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引用次数: 0

Abstract

Abstract. Wind turbine power performance measurements often occur at the perimeter of a wind farm, where the wind flow is subject to blockage effects, which might impact the measured power performance. We perform Reynolds-averaged Navier–Stokes simulations of a wind farm with five rows of 20 turbines each, operating in a conventionally neutral boundary layer, to evaluate whether the power performances measured for turbines in the upstream row would differ from that of a turbine operating in isolation under the same inflow conditions. We simulate the power performance measurements with both meteorological masts and nacelle-mounted lidars. Results show that blockage effects have an impact on the measured power performance of the wind farm turbines, with measured power coefficient varying more than 1 % relative to what is measured for the isolated turbine. In this work, we propose a method to correct for the effect of blockage on power performance measurements, yielding a curve that is more consistent with how power curves in energy yield analyses are defined and used, and thereby allowing for more useful comparisons between these curves. Our numerical results indicate that the correction method greatly reduces blockage-related variance and bias in the measured power curves. While flow modeling can be used to calculate the correction factors for actual power performance measurements in the field, we additionally show how some of the correction factors can be derived from lidar measurements. Finally, the numerical results suggest that the method could also be used to correct for the effect of wakes on power performance measurements conducted on turbines located downstream of the leading row.
校正阻塞和湍流对动力性能测量影响的方法
摘要。风力发电机的功率性能测量通常发生在风电场的周边,那里的气流受到阻塞效应的影响,这可能会影响测量的功率性能。我们对一个风电场进行了reynolds -average Navier-Stokes模拟,该风电场有五排,每排20台涡轮机,在传统的中性边界层中运行,以评估在相同的流入条件下,上游排涡轮机的功率性能是否与隔离运行的涡轮机不同。我们模拟了气象桅杆和机舱安装的激光雷达的功率性能测量。结果表明,阻塞效应对风力发电机组的实测功率性能有影响,实测功率系数相对于隔离式风力发电机组的实测功率系数变化大于1%。在这项工作中,我们提出了一种方法来纠正阻塞对功率性能测量的影响,产生的曲线与能量产出分析中的功率曲线的定义和使用方式更加一致,从而允许在这些曲线之间进行更有用的比较。数值结果表明,修正方法大大降低了实测功率曲线中与阻塞相关的方差和偏差。虽然流动建模可用于计算现场实际功率性能测量的校正因子,但我们还展示了如何从激光雷达测量中推导出一些校正因子。最后,数值结果表明,该方法也可用于校正尾迹对排首下游涡轮功率性能测量的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Wind Energy Science
Wind Energy Science GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
6.90
自引率
27.50%
发文量
115
审稿时长
28 weeks
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