Double-wind-wheel offshore floating type wind turbine generator

Abstract

The invention discloses a double-wind-wheel offshore floating type wind turbine generator. The double-wind-wheel offshore floating type wind turbine generator comprises a front wind wheel, a rear wind wheel, a rear hub, a cabin, a front hub, a tower drum, a floating body, a catenary and an anchoring device, wherein the front wind wheel is arranged in the upwind direction, the rear wind wheel is arranged in the downwind direction, the front wind wheel and the rear wind wheel are connected to the two ends of the cabin through the hubs, and the cabin, the tower drum and the floating body are sequentially connected from top to bottom; a yawing system is arranged at a flange plate between the cabin and the tower drum; blades of the front wind wheel and blades of the rear wind wheel are respectively connected to the front hub and the rear hub through flange plates; a variable pitch system is arranged at the flange plate, connected to the front hub, of each blade of the front wind wheel; a variable pitch system is arranged at the flange plate, connected to the rear hub, of each blade of the rear wind wheel; and the rear wind wheel can fully capture remaining wind energy of the front wind wheel, gradient utilization of the wind energy is achieved, the comprehensive wind energy utilization coefficient of the wind turbine generator is increased, wake flow effects are reduced, and the sea area utilization rate and the whole power generation efficiency of an offshore wind plant are improved.

Description

technical field [0001] The invention belongs to the technical field of offshore wind power, and in particular relates to an offshore floating wind turbine with double wind wheels. Background technique [0002] Offshore floating wind turbines are suitable for areas with large water depths. Compared with wind turbines with transmission and fixed foundations, they have the advantages of lower manufacturing and installation costs, and are an important way to develop deep-sea wind energy resources in the future. [0003] However, the foundation of floating wind turbines is inherently unstable, and the wind turbines are always shaking and swaying to a certain extent at sea. The force action will also have a tendency to rotate horizontally around the tower, which cannot be eliminated, which will aggravate the overload of the basic structure of the floating wind turbine, and will cause the wind turbine to overturn in severe cases. [0004] The single wind turbine wind turbine is li...

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Problems solved by technology

[0003] However, the foundation of floating wind turbines is inherently unstable, and the wind turbines are always shaking and swaying to a certain extent at sea. The force action will also have a tendency to rotate horizontally around the tower, which cannot be eliminated, which will aggravate the overload of the basic structure of the floating wind turbine, and will cause the wind turbine to overturn in severe cases

[0004] The single wind turbine wind turbine is limited by the Bates limit, the theoretical maximum wind energy utilization coefficient is 0.593, and it is difficult to break through 0.5 in actual engineering, especially the wind energy utilization rate at the blade root is very low

The low wind energy utilization coefficient leads to low resource utilization efficiency and a strong wake effect on the rear wind turbines, which affects the comprehensive energy utilization of wind farms

[0005] The rated power of offshore wind turbines is large, and the diameter of the wind rotor often exceeds 150 meters. The ultra-long flexible blades are prone to flutter and cause structural failure.

The huge size makes the manufacturing, transportation and installation process difficult and costly, which is not conducive to the sustainable development of offshore wind power

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