A downwind wind turbine

Abstract

The invention discloses a WTGS in a downwind direction. Compared with traditional speed-change pitch-variable WTGS in an upwind direction, the WTGS disclosed by the invention adopts a downwind wind capturing manner and eliminates potential danger of collision between blades and a tower of a fan in the upwind direction; a dual-function paddle regulation device is designed, so that the mechanical load of the fan on the strong wind condition is reduced; with the adoption of a design scheme of a controllable transformation ratio gearbox, the wind energy utilization ratio of the fan is improved when the wind speed of the fan is lower than a rated wind speed; with adoption of the scheme of an asynchronous motor, the problem of power quality harmonic wave caused by the link of a converter is solved; and with the adoption of a passive yawing technology, dynamic yawing wind direction alignment of the WTGS is achieved more accurately, and the wine energy utilization efficiency is improved. With the adoption of the WTGS in the downwind direction disclosed by the invention, guiding basis is provided for the design of the related WTGS in the downwind direction.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a conceptual design method of a downwind wind power generating set. Background technique [0002] Wind energy is currently the most economically valuable renewable energy source. According to the "China Wind Power Development Roadmap 2050" issued by the Energy Research Institute of the National Development and Reform Commission, China's wind power development goals for the next 40 years: by 2020, 2030 and 2050, wind power installed capacity The capacity will reach 200 million, 400 million and 1 billion kilowatts respectively, and by 2050, wind power will meet 17% of domestic electricity demand. [0003] At present, wind turbines have become the main equipment for wind energy utilization, and upwind variable-speed and variable-pitch wind turbines are the mainstream type of wind turbines. The wind turbine absorbs wind energy through the wind wheel, uses the transmissio...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the presence of converters, the harmonic content of the grid-connected power is high, the power quality is poor, and the cost is relatively high;

[0006] 2. Due to the limited speed range, it is difficult to ensure the maximum power tracking control in the global range when the wind speed is lower than the rated wind speed;

[0007] 3. When the wind speed is too high, the thrust load on the sweeping plane of the wind rotor is relatively large, which is prone to safety accidents;

[0008] 4. The blades of the wind rotor are prone to bending deformation in the downwind direction when exposed to the wind, which may easily lead to accidents when the blades collide with the tower during the process of sweeping the wind;

[0009] 5. The load level of the mechanical link of the wind turbine increases with the increase of the wind speed, and the reliability of the wind turbine is relatively poor under the condition of high wind speed;

[0010] 6. The yaw angle of the wind turbine is difficult to accurately face the wind, and there is a waste of wind resources

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