A spatial cable system and optimization method for controlling wind turbine blade flapping
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A technology for wind turbine blades and wind turbines, which is applied to wind turbines, wind turbines, motors and other directions that are consistent with the wind direction, and can solve problems such as self-weight, impact, and difficulty in running and generating electricity.
Active Publication Date: 2018-08-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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For example, the magnitude of the tension is not easy to control, and if there is a slight carelessness, the blade will break as a whole; the construction of internal reinforcement of the blade is more difficult, which increases the cost of construction measures; It is difficult to cope with the impact of wind load uncertainty on the blade
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Embodiment 1
[0044] This embodiment takes a large horizontal axis wind turbine in China as an example, such as figure 1 As shown, the specific implementation steps are:
[0045] i) First anchor the three cables directly to the tips of the three blades, such as figure 1 (a) A static stator system without redundant degrees of freedom is formed, and the dynamic characteristic analysis is performed to obtain the fundamental frequency of the wind turbine system;
[0046] j) Establish a finite element model for the system and apply a preset wind pressure, on this basis, analyze the linear elastic buckling eigenvalues based on the theoretical equation, and obtain the calculated buckling coefficient and buckling displacement;
[0047] k) Assuming that the total length of the blade is H, the distance from the hub is H / 2( figure 1 (b)), H / 4 and 3H / 4 are equipped with static stator systems, and the dynamic characteristics and buckling analysis are carried out. Finally, the fundamental frequency, ...
Embodiment 2
[0055] This embodiment takes a large vertical axis wind turbine in China as an example, such as figure 2 As shown, the specific implementation steps are:
[0056] i) First anchor the six cables directly to the tops of the six blades, such as figure 2 (a) A space cable system is formed, and the dynamic characteristic analysis is carried out on this basis to obtain the fundamental frequency of the wind turbine system;
[0057] j) Establish a finite element model for the system and apply a preset wind pressure, on this basis, analyze the linear elastic buckling eigenvalues based on the theoretical equation, and obtain the calculated buckling coefficient and buckling displacement;
[0058] k) Assuming that the total length of the blade is H, it is at H and H / 2 from the top of the blade in turn ( figure 2 (b) and figure 2 (c)) The static stator system is set up, and the dynamic characteristics and buckling analysis are carried out. Finally, the fundamental frequency, buckl...
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Abstract
The invention discloses a space stay rope system for controlling blades of a wind turbine to swing and an optimizing method for the space stay rope system. The blades of the wind turbine are formed by connecting hubs mounted on a cabin; same parts, in the wing extending direction, of the blades are fixed through full-length space stay ropes, and the same parts are separately positioned on 1 / 4 portions, 1 / 2 portions, 3 / 4 portions and blade tips of the blades; a group of three space stay ropes of the same parts of the blades forms a static stator system without extra degree of freedom; the space stay rope system comprises a plurality of static stator systems, and each static stator system consists of three space stay ropes of one group; quantity of the static stator systems is determined by performing linear elastic characteristic value buckling analysis through an established finite element model; and buckling coefficient of a wind turbine system under conditions that different quantity of static stator systems are mounted is compared to finally determine the optimal quantity of the space stay rope static stator system. The space stay rope system can remarkably improve buckling stability of a tower frame-blade coupling system of the wind turbine while controlling the blades of the wind turbine to swing, and has the advantages of being simple in structure, convenient to construct and the like.
Description
technical field [0001] The invention discloses a space cable system and an optimization method for controlling blade waving, and relates to the technical field of building of wind power systems and the technical field of wind resistance of large towering structures. Background technique [0002] As one of the main structures for wind power generation, wind turbines are gradually developing towards high power, and the ensuing wind-induced damage and stability problems are becoming more and more prominent. Among them, the bending and torsion of blades and the collapse of tower instability are the most common damages. form. [0003] The wind turbine system under the action of strong wind is in the stop state, and its bending stiffness is reduced compared with the rotating state. In addition, the drastic change of strong wind direction will cause the wind angle of attack of the airfoil to change greatly, and then the blades of the wind turbine will appear aerodynamic instabilit...
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