A method and device for changing the angle of attack of an h-type vertical axis wind power generator

Abstract

The invention provides an attack angle variation method for an H-shaped vertical-axis wind turbine. The attack angle variation method comprises the following steps that (1) the theoretical optimum attack angles of an upper wind area and a lower wind area are determined; (2) the operation relations of the induced velocities and the inducing factors of the upper wind area and the lower wind area are obtained; (3) the adjusting law of the mounting angle of blades of the upper wind area is determined; (4) the adjusting law of the mounting angle of blades of the lower wind area is determined; and (5) according to the adjusting laws of the mounting angles of the blades of the upper wind area and the lower wind area, the mounting angle of the H-shaped vertical-axis wind turbine is adjusted in real time. The invention further provides an attack angle real-time adjusting device of the H-shaped vertical-axis wind turbine. By using the attack angle variation method for the H-shaped vertical-axis wind turbine, the blade attack angle is adjusted in real time, so that the attack angles of all positions of the blades in the rotating process are closest to the optimum attack angles, and the purpose that the wind energy utilization ratio is increased is achieved accordingly.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a method for changing the angle of attack of an H-type vertical axis wind power generator and a real-time adjustment device for the angle of attack. Background technique [0002] At present, the wind energy utilization rate of vertical axis wind turbines is only about 35%, which is far lower than the theoretical value of 66.6%. This shortcoming hinders its large-scale development. The synthetic wind speed of the vertical axis wind turbine refers to the vector sum of the incoming wind speed and the tangential wind speed. The angle of attack of the blade refers to the angle between the synthetic wind speed and the blade chord line. The installation angle of the blade refers to the angle between the blade chord line and the tangent line of the wind rotor. angle. Among them, the blade angle of attack is one of the most important factors affecting the wind energy utili...

AI Technical Summary

Problems solved by technology

However, in terms of structure, the blade angle-of-attack adjustment devices designed by Yan Qiang and Lian Zhengguang both use a cam mechanism, which is difficult to adapt to different wind speeds; the prototype used by Zhang Lixun et al. Separately control the change of the angle of attack of the two blades, which increases the inertia of the system, and the adjustment method has a certain hysteresis

In addition, theoretically, in the analysis of the aerodynamic characteristics of the above research, it is assumed that the induced velocities in all directions in the downwind area of ​​the vertical axis rotor are consistent in size and direction; although these assumptions simplify the calculation, the research results cannot fully reflect the actual situation; and the adopted The static data of the airfoil does not consider the dynamic stall problem of the vertical axis wind turbine under the actual working conditions

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