High-power compact electro-hydraulic wind generating set assembly

Abstract

The invention discloses a high-power compact electro-hydraulic wind generating set assembly which comprises an impeller assembly, a hydraulic pump assembly, an oil tank and an electro-hydraulic all-in-one machine assembly contained in a cavity of an oil tank shell. The electro-hydraulic all-in-one machine assembly comprises a generator shell assembly, a rotor assembly, a stator assembly and a hydraulic motor assembly, the rotor assembly, the stator assembly and the hydraulic motor assembly are contained in a shell cavity of the generator shell assembly, the hydraulic pump assembly sucks oil from an oil tank shell cavity and / or a generator shell cavity, and the impeller assembly is connected with the hydraulic pump assembly. The hydraulic pump assembly outputs high-pressure oil to drive a hydraulic motor assembly and a rotor assembly in the electro-hydraulic all-in-one machine assembly to rotate, and power generation is achieved. The wind generating set disclosed by the invention is high in electro-hydraulic fusion, and has the characteristics of high power, compact structure, small volume, light weight, low noise, high efficiency, energy conservation, self-cooling, high power density, high reliability, long service life and the like.

Description

technical field [0001] The invention belongs to the technical field of power generation, and particularly relates to a high-power compact electro-hydraulic wind generator set assembly in the field of wind power. Background technique [0002] As a clean and renewable energy, wind energy is an important support for my country's energy transformation. At present, wind power generation is one of the most mature, large-scale development conditions and commercialized development prospects. Wind power generation has obvious advantages in changing the energy structure and alleviating environmental pollution, and has attracted more and more attention at home and abroad. , countries around the world have attached great importance to the development of wind power. After 2025, the average annual new wind power installed capacity will be no less than 60GW. The converted investment amount is calculated at 7,000-10,000 yuan / kw. In the future, the annual new investment in wind power in my ...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, it is an assembly diagram of a traditional box-type wind turbine. The gearbox-type wind turbine includes a speed-up gearbox 1, a coupling 3, and a generator 2. One end of the speed-up gearbox 1 is connected to the impeller, and the other end is connected through the coupling The shaft is connected to the generator 2. This structure has the following characteristics: (1) The speed-up gearbox 1 is one of the most critical components of the wind turbine. At present, the speed-up gearbox is difficult to process, expensive, and has a high failure rate , prone to problems such as failures, a large number of practices have proved that the speed-up gearbox is the weakest link in the transmission chain of the wind turbine; (2) the traditional box-type wind turbine assembly will speed-up gearbox 1, The device 3 and the generator 2 are axially and axially arranged, such as figure 1 As shown, it occupies a large space and is heavy, especially the speed-up gearbox 1 occupies more than 60% of the volume and weight; (3) there are many independent components such as the speed-up gearbox 1, coupling 3, and generator 2 The connection makes the structure of the wind turbine complex, there are many energy conversion and power transmission links, the assembly coaxiality is not easy to guarantee, and mechanical friction loss, vibration noise, etc. are easy to occur; (4) The traditional gearbox wind turbine needs an additional speed increase The addition of a lubrication device to the gearbox 1 and the need to add an additional cooling device 4 to the generator increase the complexity of the equipment, additional energy loss, and construction and operation costs

[0006] Another mainstream wind turbine type is a multi-stage permanent magnet synchronous generator directly driven without a gearbox. The impeller of the direct-drive wind turbine is directly connected to the generator, eliminating the need for a speed-increasing gearbox, and the maintenance workload is significantly reduced. However, the direct-drive permanent magnet synchronous wind turbine also has the following problems: (1) Since the generator speed is very low, the number of poles of the generator is very large, resulting in a large volume and heavy weight of the generator, which is about the same as that of a gearbox-type wind turbine. The weight is about 10 times of that; (2) The permanent magnet synchronous generator uses a lot of materials, especially the large amount of rare metals, and its cost has been high due to the influence of raw materials; (3) The direct drive permanent magnet synchronous wind turbine has constant speed Frequency technology is realized through electronic control, the control system is very complex, and high-power rectifier inverters have high requirements for electronic components and high prices.

[0007] Another development trend of wind power generating sets is large-capacity and large-scale development. The latest 12MW wind generating set has been successfully launched, and future larger-capacity generating sets are also under development. However, with the increasing power of wind power generating sets , the volume and weight of speed-increasing gearboxes, generators and other components are also increasing, which is not only difficult to process, it is difficult to ensure accuracy, and even transportation, assembly, and hoisting are extremely difficult, and the requirements for foundations are also getting higher and higher, which affects The construction cost of the tower, therefore, it is difficult for traditional wind turbines to greatly reduce the cost of wind power, and parity is extremely difficult

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