Low-wind-speed wind driven generator blade, chord length control method thereof and wind turbine generator system

Abstract

The invention discloses a low-wind-speed wind driven generator blade and a wind turbine generator system comprising the same. The blade can be folded and unfolded in the chord length direction; the folding and unfolding positions are positioned in the position of a blade beam cap; in the position of the beam cap at the upper half part of the blade, three blade sections capable of relatively movingare arranged in the chord length direction of the blade in sequence; and correspondingly, in the position of the beam cap at the lower half part of the blade, three blade sections capable of relatively moving are also arranged in the chord length direction of the blade in sequence. The invention further discloses a chord length control method of the blade; when the wind speed is within the cut-inwind speed and the average wind speed, the blade is in a total unfolding state; when the wind speed is within the average wind speed and the rated wind speed, the blade is in part unfolding state; and when the wind speed is within the rated wind speed and the cut-out wind speed, the blade is in a total folding state. The blade and the wind turbine generator system can adapt to different wind conditions, and have the advantages of low fan load, low total cost and high power generation quantity.

Description

Technical field [0001] The invention relates to the technical field of low-wind speed wind power generation, in particular to a low-wind speed wind power generator blade, its chord length control method and a wind power generator set. Background technique [0002] In response to the market demand in China with low wind speeds ranging from 5 to 7.5m / s, domestic and foreign wind power equipment manufacturers have invested a lot of research and development resources on "low wind turbine technology". The mainstream models on the market are mainly 1.5MW and 2MW, and the development of ultra-long and lightweight Blades, increasing the unit's unit kilowatt sweeping area, increasing the impeller wind energy capture, researching and applying a variety of new load reduction technologies, optimizing the limit and fatigue design load of each component of the unit, and reducing the cost of the whole unit are currently problems that need to be overcome. [0003] One of the important strategies i...

AI Technical Summary

Problems solved by technology

[0003] One of the important strategies in the design of low-wind-speed wind turbines is to increase the diameter of the wind rotor, that is, to increase the length of the blades. Although the above-mentioned design can increase the sweeping area to a certain extent, improve the wind energy capture of the impeller, and then improve the power generation efficiency and annual power generation, but The following problems are prone to occur: (1) Under different wind conditions, the sweeping area of ​​the wind rotor of the same blade remains unchanged. When the wind speed is high, the load on the blade also increases other loads other than the blade, such as blade Pitch bearings, hub loads, tower loads, etc., the entire unit is heavy and costly

(2) The longer blade length will reduce the bending stiffness of the blade in the waving direction, thereby reducing the ability of the blade to resist deformation, and the static air design bottleneck of long blades is likely to occur

[0004] This shows that the above-mentioned existing low-wind-speed wind-driven generator blade obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently

Images