Improved extra large vertical axis wind turbine generator system

Abstract

The invention discloses a technology for an extra-large vertical-axis wind-driven turbine power generation unit. The technology for the extra-large vertical-axis wind-driven turbine power generation unit has the advantages that a turbine is an extra-large unit with the power level higher than or equal to 10MW, double-blade and single-arm AerogeneratorX designs of a British Arup company are improved to obtain double-blade and double-arm triangular designs from the perspective of structural mechanics, and accordingly the shortcoming of low structural strength due to high shear stress of cantilever beams can be overcome; starting torque can be increased by the aid of the additional Savonius turbine, driving torque is stable owing to the additional Savonius turbine, and output power of the unit can be increased; a novel power generator and a novel motor converter technology are matched with each other, so that a large wind power system can be formed and becomes the extra-large vertical-axis wind power generation unit with integrated novel domestic and foreign technologies and high industrial implementation degrees.

Description

Technical field [0001] The invention belongs to the technical field of machinery and electricity, and specifically, provides a power generation system device driven by a vertical axis wind turbine. Background technique [0002] The wind turbine generator system composed of wind turbines (hereinafter also referred to as wind turbines or wind turbines) is a new energy power generation device that converts the kinetic energy of the wind into mechanical energy suitable for the generator shaft to accept, and then drives the generator to rotate. Among the currently widely used horizontal-axis turbines, the capacity of the turbine is the most important in the wind power generation process. Industry practice has proved that the increase in the power of a single machine is conducive to reducing the cost of installed capacity per unit of power and the cost of wind power generation per kilowatt-hour. Therefore, the rated power capacity of a single unit continues to increase. The single uni...

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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 80-100 meters long. The three-pin blade is a cantilever beam structure, and one end is fixed on the hub. There is huge shear stress and low structural strength. For strong wind damage, 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; in addition, with the increase of power, the weight of the generator and the height of the tower Increase, the cost of electrical, tower and foundation construction will increase greatly, and the cost of the whole machine will 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 , its manufacturing cost will be much higher than that of the main shaft of the horizontal axis, and the long main shaft that requires high strength and rigidity almost makes the vertical axis turbine lose the advantage of omitting the cost of the tower of the horizontal axis unit;

[0006] 3. In addition, due to the insufficient self-starting capability of the Darrieus vertical axis turbine, additional starting devices must be considered, especially at low wind speeds, the unit’s self-starting capability is insufficient. In addition, when the central axis of the blades of the two-bladed Darrieus turbine When the wind direction is the same, even if the wind speed is very high, it is impossible to start, so the starting characteristics of the Darrieux turbine are also a technical subject to be improved;

[0007] 4. Although the cost of a two-blade Darrieux turbine is lower than that of a three-blade or multi-blade turbine, during the entire 360° rotation process of the fan, the torque fluctuation generated by the wind energy drive is very serious, although it can be caused by the huge inertia of the unit [smooth, but It will still cause a corresponding change in the output power of the generator, which will directly affect the power quality

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