Wind tunnel study of the power output spectrum in a micro wind farm

[摘要] Instrumented small-scale porous disk models are used to study the spectrum of a surrogate for the power output in a micro wind farm with 100 models of wind turbines. The power spectra of individual porous disk models in the first row of the wind farm show the expected -5/3 power law at higher frequencies. Downstream models measure an increased variance due to wake effects. Conversely, the power spectrum of the sum of the power over the entire wind farm shows a peak at the turbine-to-turbine travel frequency between the model turbines, and a near -5/3 power law region at a much wider range of lower frequencies, confirming previous LES results. Comparison with the spectrum that would result when assuming that the signals are uncorrelated, highlights the strong effects of correlations and anti-correlations in the fluctuations at various frequencies.

[发布机构] Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300, Leuven, Belgium^1;Department of Mechanical Engineering, Center for Environmental and Applied Mechanics, Johns Hopkins University, 3400 North Charles Street, Baltimore; MD; 21218, United States^2

[关键词] Higher frequencies;Lower frequencies;Porous disk;Power out put;Power-law region;Power-spectra;Small scale;Wake effect