Influence of Horizontal Maximum Wind Velocity Height of Downburst on Blade Root Load of Wind Turbine

Abstract

In order to study the influence of the change of the horizontal maximum wind velocity height of downburst on the blade root load characteristics of wind turbine, a three-dimensional fluctuating wind field of downburst was constructed by using the analytical theoretical model of downburst combined with IECKAI fluctuating wind spectrum model, and the variation law of wind turbine blade root load when the horizontal maximum wind velocity height of downburst changed was calculated and analyzed. The results show that when the horizontal maximum wind velocity height of downburst changes from the bottom position to the top position of the rotor plane, it has a great influence on the edgewise bending moment of the wind turbine blade root, and the average value of the maximum value increases by 22.66% compared with the minimum value. When the horizontal maximum wind velocity height of downburst is located at the bottom of the rotor, the average value of the flapwise bending moment is the smallest. When other heights change, the impact on the flapwise bending moment of the blade root is small, and the maximum value of the average value only increases by 2.12% compared with the minimum value.