Device for utilizing front edge rudder pieces to adjust output power of rotating blade and method thereof

Abstract

The invention relates to a wind-driven generator, in particular to a device for utilizing front edge rudder pieces to adjust output power of a rotating blade and a method thereof. A certain quantity of rudder pieces are added at the front edge of the rotating blade, strong vortex flow generated by the rudder pieces under different attitude angles is utilized to carry out active intervention on a flow characteristic of the upper surface of the blade to change the original aerodynamic characteristic thereof and lead the blade to keep stable output power in larger range of operating conditions; and the rudder piece has two rotational degrees of freedom of rolling and pitching, not only can lead all the rudder pieces to keep a uniform attitude angle, but also can adjust the attitude angle of each rudder piece separately in the process of practical control. The device provided by the invention has simpler design and more flexible and finer control, can effectively improve the aerodynamic property of the rotating blade when in high-wind-velocity off-design working conditions, and improve operating efficiency of a wind-driven generator set.

Description

technical field [0001] The invention relates to a device and a method for adjusting the output power of a wind generator rotating blade by using a leading edge rudder blade. Background technique [0002] Rotating blades are widely used in the wind power industry as an energy conversion device. Through the action of rotating blades, wind turbines convert wind energy into electrical energy and output it. [0003] In order to maximize the extraction of wind energy from the air and improve the operating efficiency of wind turbines, it is usually necessary to optimize the design of the rotating blades when designing wind turbines. The optimized design of the rotating blades can operate under a specified design condition (such as rated wind speed, etc.) with the best aerodynamic performance, so that the power generation efficiency of the wind turbine can be the highest. [0004] However, in the actual operation of the fan, affected by natural conditions (such as climate, terrain...

AI Technical Summary

Problems solved by technology

[0011] (1) The control mechanism is complex and expensive;

[0012] (2) Compared with the changing speed of airflow, the pitch control speed is relatively slow, the flow response time is long, and the response lags behind;

[0013] (3) The change of the local angle of attack at each span position of the rotating blade caused by the change of wind speed is nonlinear, but the variable pitch control can only uniformly adjust the blade angle of attack at the root of the blade, so the angle of attack introduced by the variable pitch control The correction effect is different for each spanwise position of the blade, which leads to different aerodynamic performance at the corresponding position and uneven force on the blade;

[0017] (1) Stall leads to a sharp decline in the aerodynamic performance of the blades, and the unsteady characteristics of the flow are prominent, resulting in a significant reduction in the power generation efficiency of the fan and a significant increase in the unsteady pulsation characteristics of the output power;

[0018] (2) The stall aggravates the aeroelastic deformation of the blade itself, and long-term operation in the stall zone will lead to a significant decrease in the service life of the fan;

[0019] (3) Stall control is also not applicable to yaw state

Therefore, these control schemes are applicable to a small range of working conditions, and the control effect is relatively limited

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