The intermittency in wind power can face electrical network with some challenges such as power quality, frequency deviation and reliability of the system. So estimated power fluctuation in wind farm has to be known in order to reach to the grid integration requirements. In this paper the wind farm power fluctuation is investigated by considering the three factors; wake effect, turbulence and spatial smoothing, simultaneously. The wake effect is investigated for the mean value and turbulence part of the wind speed separately because of different effects of the wake. The engineering models in fluid mechanics is used for analyzing the wake effect and spatial smoothing. The proposed approach is sued for a 160 MW wind farm as a case study.
