Wind power generation device non self-locking speed change and speed-increasing gearbox

Abstract

The invention discloses a wind power generation device speed-increasing gearbox, in particular to a wind power generation device non self-locking speed change and speed-increasing gearbox. The wind power generation device non self-locking speed change and speed-increasing gearbox comprises a speed change and speed-increasing gearbox and a control system thereof and is characterized in that the gear meshing of the speed change and speed-increasing gearbox is in non self-locking meshing, the speed change and speed-increasing gearbox adopts gearbox stepped speed changing and comprises a planetary gear speed change and speed-increasing gearbox and a dead-axle eight-grade speed change and speed-increasing gearbox, and the control system of the speed change and speed-increasing gearbox is a speed-change automatic control system. The wind power generation device has no self-locking speed change and speed-increasing gearbox, the speed-increasing gearbox speed increasing ratio is above 200 so as to widen the velocity space of a wind generating set. The speed-increasing gearbox adopts stepped speed change technology, reduces the energy loss of the power generation device, improves wind power generation device efficiency, saves investment, fully utilizes wind power resource and improves investment rate of return.

Description

(1) Technical field [0001] The invention relates to a speed-increasing gear box of a wind power generating device, in particular to a non-self-locking variable speed speed-up gear box of a wind power generating device. (2) Background technology [0002] At present, due to the low wind speed and the low speed of the wind rotor, the working speed range of the wind power generation device is generally 15 to 30 rpm, while the rated speed of the generator is relatively high, generally 3000, 1500 or 1000 rpm , from the movement of the wind wheel to the middle of the generator, a speed-up device is required. The device commonly used at present is a speed-up gearbox. Due to the friction force on the tooth surface of the gear meshing, the speed-up ratio is large to produce self-locking, because the gear meshing Limited by the self-locking phenomenon, the current speed-up ratio of the speed-up gearbox is below 100, generally around 60. With such a gear speed-up ratio, for small and m...

AI Technical Summary

Problems solved by technology

The speed-up ratio that can be achieved by the current gear speed-up box can no longer satisfy

The wind rotor of a 5MW wind power generation device needs to work at 10 rpm, and the relatively low-cost 1500 rpm generator is used. The speed-up ratio of the gearbox is insufficient, and the capacity of the wind power generation device is still developing. For wind power generation devices with insufficient gear box speed ratio, full frequency modulation technology is currently used to solve the problem. It is characterized by a back-to-back frequency conversion system composed of two sets of power converters connected by a DC link. The generator generates power according to the frequency provided by the wind rotor. , according to the frequency conversion of the grid frequency to input the grid, thereby overcoming the lack of gearbox speed ratio, however, the wind turbine generator set of this technical solution operates at a low frequency, and needs to use a generator with more poles, a larger volume, and a higher cost , this is because to reduce the frequency by 1 / 2, the generator needs to double the number of poles, double the windings, use double the copper material, double the volume of the motor, and double the cost of the motor, which is equivalent to using more A MW-level generator is obviously not good for a wind power generation device with a relatively high investment. However, in order to achieve the same purpose, doubling or even tripling the gear box speed ratio is just adding a pair of gears and a root shaft, the cost increase is very small, which is insignificant compared with a MW-level generator

[0005] where n is the speed of the wind rotor, R is the radius of the wind rotor, V is the upstream wind speed, for a specific wind rotor, λ has an optimal value, and when λ is optimal, the wind energy utilization coefficient Cp has a maximum value, and λ is equal to a constant , the wind speed V of the wind field changes, while the speed n of the wind rotor remains unchanged, the utilization coefficient of wind energy will decrease, and the wind energy is the cube of the wind speed. The energy loss caused by the speed loss of the existing wind power generation device is very large. The energy loss of the wind power generation device is 50%, the energy loss of the wind power generation device of the two-speed generator is 33%, the equipment efficiency is very low, and the investment utilization rate is very low

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