10mw level aerodynamic braking vertical axis wind power system

Abstract

The invention discloses the ultra-large type vertical axis wind turbine electromechanical technology. A turbine is an ultra-large type unit of the 10MW level or more. From the perspective of structural mechanics, two-blade single arm Aerogenerator X design of the Arup company in the England is improved to double-triangle connecting design of two-blade double arms. The system has the strongest structural stiffness and strength in large type machines all the world, so that the unit output power is improved; meanwhile the aerodynamic braking problem is solved, and a direct drive type electric generator of an open type new structure is obtained, so that the wind turbine electromechanical system becomes a wind turbine generator set integrated with the latest technology at home and abroad, the largest output power and the highest industrialization implementation degree.

Description

technical field [0001] The invention belongs to the technical field of turbine power generation, and specifically proposes an ultra-high-power composite vertical-axis wind turbine generator system with an aerodynamic brake. Background technique [0002] A wind turbine (hereinafter also referred to as a wind turbine or fan for short) is a renewable energy power device that converts the kinetic energy of the wind into mechanical energy suitable for the shaft energy of the generator, and then drives the generator to rotate to generate electricity. In the whole process of wind power generation, the capacity of the turbine is the first important one. In the existing widely used horizontal-axis turbines, industry practice has proved that the increase in the power of a single machine is beneficial to reduce the cost of installed capacity per unit power and the cost of wind power generation. Therefore, the rated power capacity of a single machine continues to increase, and the sing...

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Problems solved by technology

[0004] 1. For a horizontal axis turbine with a stand-alone power of 10MW, its blades are 80 to 100 meters long. The three-pin blade is a cantilever beam structure, and one end is fixed on the hub. Due to the dual effects of wind force and gravity, there is huge stress And the resulting deformation, the structural strength itself is low, and it is easy to be damaged by strong winds. Carbon fiber materials with higher structural strength must be used. The cost of materials and processes is very high, especially in terms of survivability against strong winds; At a high altitude, with the increase of power, the weight of the generator increases, the height of the tower increases, and the cost of electrical, tower and foundation construction increases greatly, which makes the cost of the whole machine rise sharply;

[0005] 2. If a 10MW-level vertical axis Darrieux turbine is used, although the blades are supported at both ends, which overcomes the disadvantage of the single-end support of the cantilever beam, the length of the main shaft is likely to exceed 100 meters. In order to ensure low shaking and rigidity during rotation , the manufacturing cost of the main shaft will be much greater than that of the horizontal shaft

[0006] 3. When encountering strong winds, the braking of the turbine cannot be simply solved by the internal brake. There must be an aerodynamic brake to reduce the turbine speed to a low speed in advance, and then the internal brake can solve the braking problem and realize the stop.

Horizontal axis turbines can be aerodynamically braked by blade tip spoilers or by adjusting the pitch angle, but the aerodynamic brake problem of vertical axis turbines is difficult to solve

There is no aerodynamic braking check. Once there is strong wind, it is very likely that a strong wind will destroy the entire wind power system. The safety of vertical axis wind turbines under strong wind cannot be guaranteed.

[0007] 4. The generator is the key equipment to realize wind power generation, but the rated speed of the ultra-large wind turbine is usually 3-4 rpm. According to the economic principle, the gear box is the preferred solution for increasing the speed, but the gear box is in the temperature range. Extremely harsh outdoor environment, poor working conditions, high damage rate, and inconvenient maintenance. If direct drive without a gearbox is used, the volume and weight of the low-speed generator are very large, and the manufacturing and transportation costs are also high.

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