Hydraulic system and wind-driven power generator set

Abstract

The invention relates to the technical field of wind-driven power generator sets, and particularly discloses a hydraulic transmission system for transmitting the power generated by a wind wheel of a wind-driven power generator set to a power generator, wherein the hydraulic transmission system comprises a first hydraulic pump and a hydraulic motor; the power input end of the first hydraulic pump is connected with a wind wheel main shaft; the oil inlet of the first hydraulic pump is communicated with an oil tank, and the oil outlet of the first hydraulic pump is communicated with the oil inlet of the hydraulic motor; the oil outlet of the hydraulic motor is communicated with the oil tank; the power output end of the hydraulic motor is communicated with the power input end of the power generator; and an oil channel between the first hydraulic pump and the hydraulic motor is provided with a speed regulating valve. No matter how the wind speed changes, the transmission system can always enable the power generator to operate always at a constant speed, and can enable the power and frequency of electricity to be constant. The invention also discloses a wind-driven power generator set.

Description

technical field [0001] The invention relates to the technical field of wind power generators, in particular to a hydraulic system for transmitting the power generated by the wind rotor of the wind power generator to the generator. The invention also relates to a wind power plant with a hydraulic system as described above. Background technique [0002] A wind turbine is a power machine that converts wind energy into mechanical energy. The wind turbine uses wind power to drive the blades of the wind wheel to rotate, and then increases the speed of rotation through a speed increaser to drive the generator to generate electricity. [0003] In the prior art, a common wind turbine usually includes a wind rotor, a main shaft of the wind rotor, a gearbox, a generator, a tower and a nacelle on the top of the tower. One end of the main shaft of the wind rotor is connected to the hub of the wind rotor. The other end of the gearbox is connected to the input end of the speed increasing ...

AI Technical Summary

Problems solved by technology

However, wind turbines equipped with frequency converters still cannot achieve constant power generation

[0005] In addition, when the wind power generating set develops to the megawatt level, especially when the high-power offshore wind turbine develops to more than 3 megawatts, if all the components are installed in the nacelle on the top of the tower, the size of the nacelle will be significantly increased, and the tower The sharp increase of the top load makes the equipment yaw system load too large, and the nacelle yaw becomes difficult

The size of the nacelle will also be super high and super long, which will seriously affect the transportation and hoisting of the whole machine; at the same time, in order to meet the load-bearing strength, the structural strength of the tower will also increase, which will greatly increase the cost of the tower and affect the power generation efficiency and investment value of the whole machine

The transmission components are arranged in the nacelle at a high altitude, which makes the hoisting and maintenance of each transmission component very inconvenient, and increases the use cost of the wind turbine

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