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Comparison of individual versus ensemble wind farm parameterizations inclusive of sub‐grid wakes for the WRF model
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Comparison of individual versus ensemble wind farm parameterizations inclusive of sub‐grid wakes for the WRF model
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Comparison of individual versus ensemble wind farm parameterizations inclusive of sub‐grid wakes for the WRF model
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Journal Article
Comparison of individual versus ensemble wind farm parameterizations inclusive of sub‐grid wakes for the WRF model
2022
Overview
Wind turbine wakes can be predicted somewhat accurately with mesoscale numerical models, such as the Weather Research and Forecast (WRF) model, via a wind farm parameterization (WFP) that treats the effects of the wakes, which are sub‐grid features, on power production and the environment. A few WFPs have been proposed in the literature, but none has been able to properly account for the individual wakes within a grid cell or the effects of overlapping wakes from multiple turbines. A solution to these two issues is a WFP that includes both a wake model, which is a simplified analytical model of the wind speed (or wind power) deficit caused by a wake, and a wake superposition model, which accounts for overlapping wakes. Several such WFPs are developed here for the WRF model—based on the Jensen, the Geometric, and the Gaussian wake models coupled with two wake superposition methods (based on a squared deficit and a squared velocity superposition)—and tested individually, as well as combined together in an ensemble (EWFP), at two modern offshore wind farms. Most WFPs perform satisfactorily alone, but the EWFP generally outperforms them at both farms. The issue of resolved versus sub‐grid wakes is explored for single‐ and multi‐cell cases and for directions of alignment and non‐alignment between the wind direction and the turbine columns. Although different combinations of wake loss and wake superposition models might be preferred at other wind farms, the general findings and detailed performance statistics given here might provide useful guidance in their selection.
Publisher
John Wiley & Sons, Inc,Wiley
Subject
