Wind power generation refers to the conversion of wind kinetic energy into electricity. Wind energy is a clean and pollution-free renewable energy source. It has been used for a long time, mainly through windmills to pump water and grind surfaces. Now, people are interested in how to use wind to generate electricity.

　　

　　Wind power generation is very environmentally friendly and has a huge amount of wind energy, so it has been paid more and more attention by all countries in the world.

　　

　　Although there are many kinds of wind turbines, they can be divided into two categories: horizontal axis wind turbines, whose rotating axis is parallel to the wind direction; vertical axis wind turbines, whose rotating axis is perpendicular to the ground or airflow direction.