Inhaul cable device used for reinforcing stability of blades of large wind driven generator

Abstract

An inhaul cable device used for reinforcing stability of blades of a large wind driven generator comprises blades, fan hubs, a fan spindle, a front longitudinal inhaul cable system, a transverse inhaul cable system and an inhaul cable tension adjustment system, wherein the front longitudinal inhaul cable system and the transverse inhaul cable system can adopt an inhaul cable for tensioning, the transverse inhaul cable system transmits the tension to the front end of a fan by a longitudinal tension transmission inhaul cable and a rotating bracket, and adjusts and controls the tension by the inhaul cable tension adjustment system, so that the blades have higher rigidity along the rotating circumference and the wind direction, the vibration resistance and the wind load resistance of the blades are greatly improved, and the inhaul cable device is particularly suitable for a large blade system with more than three blades. Due to the inhaul cable device provided by the invention, the large wind driven generator can adopt the blades which are lighter and longer and have better stability, the inhaul cable device has the characteristics of convenience in site operation and maintenance, controllable stress state and high safety, and is particularly applicable to the design and the construction of large and extra-large blades.

Description

technical field [0001] The invention relates to a modular large-scale wind power generator blade structure capable of charging and pumping air, and belongs to the field of wind power generation equipment. Background technique [0002] Most of today's energy sources are fossil fuels: coal, oil, and natural gas. At current rates of use, the remaining known coal deposits will be used up in about 200 years, while oil and gas will be used up in less than 100 years. do. Fossil fuels cause a lot of environmental pollution when used, including greenhouse gases that contribute to global warming. Wind energy is one of the most commercially viable and dynamic renewable energy sources. It is clean, low-cost, and inexhaustible. Wind power has the advantages of large growth space for installed capacity, rapid cost reduction, safety, and energy never being exhausted. Wind power can effectively alleviate air pollution, water pollution and global warming while providing a stable power sup...

AI Technical Summary

Problems solved by technology

[0007] 1. In terms of large scale, megawatt-level wind turbines have commercial value now, and their single-unit capacity can reach 2-3MW. At present, the largest offshore wind turbine has a single-unit capacity of up to 5MW, and the length of the wind turbine blades is also greater than 30m. , the weight of the generator set is also relatively heavy, which will inevitably bring greater difficulties in transportation and installation, and the structural safety of the wind turbine set will also face greater risks when the wind is strong

[0008] 2. In terms of variable speed operation, that is, compared with constant speed wind turbines, variable speed wind turbines have the advantages of large power generation, good adaptability to wind speed changes, low production costs, and high efficiency. However, for large wind turbines, due to The blades are longer and heavier, and the control of their inertia will be a difficult point

[0009] 3. In terms of design and operation of variable pitch, fixed pitch is currently developing towards variable pitch. The advantages of variable pitch adjustment are good starting performance of the unit, stable output power, small force on the unit structure, and convenient and safe shutdown. The pitch control mechanism is more complicated, which also increases the failure probability of the pitch device, and the control program is more complicated

[0012] As far as blades are concerned, today’s large-scale wind power generation equipment has the following deficiencies: the size of large blades is getting longer and longer, which puts forward higher and higher requirements for the weight, strength and stiffness of blade materials; although large blades can improve wind energy Utilization, because only one end of the blade is fixed on the hub of the fan, which is a typical cantilever structure. In the direction of rotation of the blade, its stiffness is relatively weak, which will inevitably bring severe vibration caused by wind load. Similarly, the blade also bears Larger loads along the wind direction will bring safety hazards under the action of extremely large winds. In short, the overall structure of larger blades has poor stability in the circumferential direction and along the wind direction. Significantly improving the overall stability of the blade structure is the key issue in the development of large and ultra-large blade structures today

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