Front speed regulating type synchronous wind generating set

Abstract

The invention relates to a front speed regulating type wind generating set which is composed of an impeller, a gearbox, a driving gear, a driven gear, a bevel gearbox, a speed regulating device, a synchronous generator and other components. The front speed regulating type wind generating set is characterized in that a motion synthesis principle is used for regulating speed, a space bevel gear mechanism serves as a motion synthesis device, the rotating speed of the speed regulating device and the rotating speed of a geared-up wind wheel are subjected to motion synthesis through the bevel gearbox, and the rotating speed of the synchronous generator is kept near a synchronous speed. The wind generating set has the beneficial effects of being high in transmission efficiency, sensitive in speed regulation, high in wind energy utilization rate and constant in speed and frequency, and belongs to friendly wind generating sets with development prospects.

Description

Technical field [0001] The invention relates to the field of wind power generation, in particular to a front-end speed-regulating synchronous wind power generating unit. Background technique [0002] As a kind of renewable clean energy with huge reserves, wind energy is receiving more and more attention from all countries. Mankind's use of wind energy is mainly the use of wind power. In recent decades, wind power technology has developed rapidly. [0003] The development of wind power technology can be divided into three stages. [0004] The first stage is a fixed-pitch and fixed-speed wind turbine, which is characterized by the fact that the blades are fixedly connected to the hub, the windward angle of the blades does not change with the wind speed, and the aerodynamic characteristics of the blades keep the speed of the impeller basically unchanged. Fixed-propeller and fixed-speed wind turbines have the advantages of simple structure, low cost, sturdiness and durability, but they...

AI Technical Summary

Problems solved by technology

However, the ability of this type of unit to deal with grid faults is obviously insufficient in the actual operation process: in the case of grid voltage drop, the transient voltage and current in the rotor circuit of the doubly-fed unit will increase significantly; the rapid increase of current will lead to variable flow The voltage on the DC side of the converter rises, and overcurrent and overvoltage will pose a threat to the power electronic devices of the converter, forcing the converter to stop running

The existing differential gear speed regulating mechanism is a two-degree-of-freedom planar planetary gear train. The speed regulating device drives the center wheel of the planetary gear train. The method has two disadvantages: one is that there is a large difference between the speed change of the center wheel and the speed change of the rack, and the speed change of the center wheel is K+1 times of the change of the speed change of the planet rack, and K is the number of teeth of the inner ring gear and the center wheel Ratio, this speed characteristic leads to a large range of speed changes of the speed regulating device, and the response sensitivity is not high; second, the speed difference between the planetary carrier and the ring gear is small, and the speed-up effect is not obvious, resulting in the value of the speed-up ratio of the speed-up box larger

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