Method for enhancing service life of wind power generator paddle

Abstract

The invention discloses a method used for improving the service life of blades of a wind power generator, belonging to automatic control of the wind power generator, more particularly relating to a method for adjusting the blade pitch angle of the wind power generator. In the process of generation, when wind speed varies between cut-in wind speed and rated wind speed, variable speed control is used and an optimal power curve is traced down to acquire a maximum power, when the wind speed exceeds the rated wind speed, further adjustment is carried out on the blade pitch angle acquired by a traditional control method, and by adjusting each pitch angle, the torque of each blade is balanced, realizing a further aim to improve force state of the blades. The method for improving the service life of blades of a wind power generator solves the defects that the blades continuously suffer accelerated fatigue and advanced damages due to the periodic force change caused by wind speed difference in the process of rotation.

Description

technical field [0001] The invention belongs to an automatic control of a wind-driven generator, and relates to a method for adjusting the blade pitch angle of a wind-driven generator. The pitch angle obtained by the pitch control method is further adjusted, and by adjusting each pitch angle, the torque of each blade can be balanced to achieve a method of improving the force state of the blade. Background technique [0002] As a green energy source, wind power is currently being promoted all over the world. Domestic new wind farms and equipment manufacturing are developing rapidly, and the power of single wind power generation units has further increased. [0003] The operating cost of wind power mainly lies in investment depreciation and maintenance costs, so it is particularly important to reduce maintenance costs during operation. [0004] The blade is the primary component of wind energy absorption. Since the wind farms are all set in places with good wind resources, t...

AI Technical Summary

Problems solved by technology

[0007] The blades are made of glass fiber reinforced plastics. In practical applications, although the wind turbine has adopted a pitch angle adjustment structure, which improves the abnormal stress on the blades above the rated wind speed and basically guarantees the stability of power generation, but in The use of a uniform pitch angle on the sweeping surface of the blades for one rotation will cause the blades to rotate at different heights during the rotation process, resulting in repeated changes in the stress between the blades and the torque of the three blades on the hub due to the difference in wind speed. The unbalance, especially repeated stress changes, is likely to cause premature damage to the blade due to accelerated fatigue

[0008] Taking a 1.5MW wind turbine as an example, its center height is generally about 70m, the blade rotation speed is between 15-25r / min, the blade length is 30-40m, and the blade tip height difference on the entire sweeping surface It will reach 60-80m, and the height difference of the sweeping surface will have a wind speed difference of 2-5m / s, so the blades will bear different stresses on the entire sweeping surface, and will continue to withstand the wind caused by the sweeping height during the rotation process. The difference brings periodic stress changes, and this periodic and reciprocating stress changes will accelerate the fatigue of the FRP blades and lead to premature damage

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