1. The devices required to produce wind energy are called wind turbines. This type of wind turbine can be roughly divided into three parts: the wind wheel (including the tail rudder), the generator and the iron tower. (Large-scale wind power plants basically do not have tail rudders, and generally only small power plants (including domestic types) have tail rudders)
2 Because the rotation speed of the wind turbine is relatively small, and the magnitude and direction of the wind force changes frequently. This makes the speed unstable. Therefore, before operating the generator, a gearbox should be attached to increase the speed to the rated speed of the generator, and a speed regulating mechanism should be added; to keep the speed stable, then connected to the onboard generator. In order to keep the wind rotor always aligned with the direction of the windt to obtain maximum power, a tail rudder similar to a weather vane must be installed behind the wind rotor.
3. The frequency of the electrical network is generally fixed. In China, it is 50Hz 4-pole generator, its synchronous speed is 1500rpm and 6-pole generator, its synchronous speed is 1000r. /min. So, when the speed of the wind wheel is lower or higher than the synchronous speed of the generator, it cannot be connected to the grid to generate electricity (the allowed range is 97-103% of the synchronous speed).
4. The rated wind speed is the wind speed generated when operating normally and operating at optimum efficiency under a corresponding power belt force.
5. When the wind speed is low, by changing the ratio between the tip speed of the wind wheel and the wind speed and changing the tilt angle into enable the wind turbine to obtain maximum capture of wind energy.