1. The overall overview of wind power is as follows: Around 2007, China’s wind power market was particularly open. However, after 2011, due to excess wind power capacity, the State Council’s support for wind power declined. Until now, China’s The wind power market is very difficult, and many companies are not performing well.
2. Technical level:
1) The main reason is that the reliability is too low. The general design life is 20 years. Major failures will occur in about 4 to 5 years of domestic operation. We As we all know, the maintenance cost of wind power equipment is extremely high.
2) There is another serious phenomenon: many domestic wind power equipment companies do not have independent research and development capabilities, and most of them buy foreign drawings and process them. Then we have a question, why the wind power equipment with the same drawing can operate for 10 years abroad, but can only operate for four years in China. Reasons: a) The service environment of domestic and foreign wind power equipment is different, and the service environment in China is poor. It will accelerate the erosion of the equipment, thereby accelerating fatigue damage. b) Domestic manufacturing processes are not as good as foreign ones. It can be said that domestic wind power equipment manufacturing does not meet the design requirements.
3) Main damage conditions: the blades are mainly affected by environmental erosion and breakage; the speed increase box is mainly caused by fatigue damage of bearings and gears; the brakes are mainly caused by braking noise and material wear; the power grid is mainly caused by the failure of power generation. stability, causing fluctuations in the power grid.
3. New power generation method: The current innovation in wind power equipment types mainly focuses on the gearbox. What is more commonly used now is the doubly-fed speed-increasing box, that is, the low speed transmitted from the blades is passed through The speed increase of the gearbox is transmitted to the generator to generate electricity. This traditional equipment type will affect the service life of the entire equipment system due to the reliability of the gearbox. The new wind power equipment is direct drive, that is, there is no speed increase box. In terms of the reliability of the entire equipment, the service life is more guaranteed, but the power generation efficiency needs to be studied.
Hope this helps!
1. Doubly-fed generator:
The stator winding is directly boosted and integrated into the power grid through a box-type transformer.
The rotor winding changes the excitation frequency through the frequency converter, and then connects to the power grid through the box-type transformer.
2. Synchronous generator:
Directly connected to the power grid through a box-type transformer
3. Direct-drive permanent magnet generator:
The stator changes the frequency through the frequency converter, and then connects to the power grid through the box-type transformer. The rotor is a permanent magnet.