Determination of Maximum Deflection Angles of a HAWT Yawing System Weather Vane Based on the Solution of the Equations of Moments

One of the main tasks in the field of renewable energy is to improve the accuracy of positioning the wind wheel of horizontal axial wind turbine (HAWT) in the direction of wind. Orientation system receives information about direction of the wind from a weather vane. Vortices from the blades passing over the nacelle make inaccuracy into the operation of this device. In this paper, an important issue for solving the problem will be considered, namely, determination of maximum deflection angles of HAWT vane. Geometry for the study is two weather vane models used on wind turbines. The initial external loads, the coefficients of normal force, and force of the longitudinal resistance of weather vane were determined using mathematical modeling. The equations of torques for rotational motion of weather vane are solved. The obtained solutions for two methods were compared. Conclusions about the results obtained were made.