Wake steering of multirotor wind turbines
Wake steering of multirotor wind turbines
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DOI：
10.1002/we.2633
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发表时间：
2020-06
期刊：
影响因子：
4.1
通讯作者：
Gustav A. Speakman;M. Abkar;L. Martínez‐Tossas;M. Bastankhah
中科院分区：
文献类型：
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作者：
Gustav A. Speakman;M. Abkar;L. Martínez‐Tossas;M. Bastankhah
在本文中，尾流转向应用于多转子涡轮机，以确定它是否有可能减少风力发电厂尾流损失。通过将转子偏航应用于多转子涡轮机，将新的自由度引入到风电场控制中，使得尾流可以被扩展、引导或重定向，以改善下游涡轮机的流入条件。五种不同的偏航配置进行了研究（包括基线情况），采用大涡模拟（LES），以产生一个多转子风力涡轮机顺风的速度场的详细表示。两个较低的保真度模型从单转子偏航研究（卷曲尾迹模型和解析高斯尾迹模型）扩展到多转子的情况下，他们的结果与LES数据进行了比较。对于每个模型，尾流分析主要是通过检查尾流横截面在不同的顺风距离。进一步的定量分析是通过表征尾迹的质心和宽度在一系列的流向位置。最重要的是，它表明，转子偏航可以有相当大的影响的分布和规模的尾流速度赤字。两种配置导致尾流膨胀的显着增加和下游速度赤字相应减少。其余两个偏航布置证明了改变涡轮机尾流方向和引导尾流的能力。较低保真度的模型显示出与特定配置的LES结果的小偏差，然而，两者都能够合理地捕获大流向范围内的尾流趋势。
In this paper, wake steering is applied to multi-rotor turbines to determine whether it has the potential to reduce wind plant wake losses. Through application of rotor yaw to multi-rotor turbines, a new degree of freedom is introduced to wind farm control such that wakes can be expanded, channelled or redirected to improve inflow conditions for downstream turbines. Five different yaw configurations are investigated (including a baseline case) by employing large-eddy simulations (LES) to generate a detailed representation of the velocity field downwind of a multi-rotor wind turbine. Two lower fidelity models from single rotor yaw studies (curled-wake model and analytical Gaussian wake model) are extended to the multi-rotor case and their results are compared with the LES data. For each model, the wake is analysed primarily by examining wake cross sections at different downwind distances. Further quantitative analysis is carried out through characterisations of wake centroids and widths over a range of streamwise locations. Most significantly, it is shown that rotor yaw can have a considerable impact on both the distribution and magnitude of the wake velocity deficit. Two of the configurations lead to a significant increase in wake expansion and a corresponding decrease in downstream velocity deficit. The remaining two yaw arrangements demonstrate a capability to redirect and channel the turbine wake. The lower fidelity models show small deviation from the LES results for specific configurations, however, both are able to reasonably capture the wake trends over a large streamwise range.