Experimental study on wake interaction and power production in an onshore wind farm under single- and double-wake conditions

This study aimed to evaluate the interference due to wind turbine wake in an operating wind farm and quantitatively analyze wake influence on wind turbine power production under single- and double-wake conditions. Variations in wind conditions due to wake effects were assessed by comparing the wind data from two met masts located inside and outside the wind farm. From the data collected by supervisory control and data acquisition systems of 1.5-MW wind turbines, the velocity and power production deficits were analyzed under the single- and double-wake conditions. Then, the power curves of the downstream and upstream wind turbines were compared. The results confirmed that the wind speed reduced by a single wake began to recover at a downstream distance of approximately 5 times the rotor diameter. Whereas the strength of single wake effects varied with distance, the double wake effects were similar regardless of distance.