Although there are many types of wind turbines, they can be summarized into two categories: ① Horizontal axis wind turbines, the rotation axis of the wind wheel is parallel to the wind direction; ② Vertical axis wind turbines, the rotation of the wind turbine The axis is perpendicular to the ground or the direction of the air flow. There are several types of vertical axis wind turbines that use resistance to rotate, including wind turbines made of flat plates and cups, which are pure resistance devices; S-type wind turbines, which have some lift but are primarily resistance devices. These devices have a large starting torque, but a low tip speed ratio, and provide low power output when the size, weight and cost of the wind turbine are certain.
The Darrieux style wind turbine was invented by the Frenchman G.J.M. Darrieux in the 1830s. In the 1970s,the Canadian National Academy of Sciences conducted a lot of research on this and was the main competitor to horizontal axis wind turbines. The Darrieux wind turbine is a lifting device. The profile of the curved blades is a sail. Its starting torque is low, but the peak speed ratio can be very high. For a given weight and cost of the wind turbine, it presents a high ratio. output power. There are many types of Darieux type wind turbines in the world, such as Φ type, Δ type, Y type and H type, etc. These rotors can be designed in single-blade, double-blade, three-blade or multi-blade versions.
Other forms of vertical axis wind turbines include the Magnus effect wind wheel, which consists of a rotating cylinder. When operating in the airflow, the displacement force generated is due to the Magnus effect caused by the Sri. Lankan effect, its size is proportional to the speed of the wind. Some starsVertical axis wind turbines use pipes or vortex generating towers to transform horizontal airflow into vertical airflow through housings or diffusers to increase speed. Sometimes they also use solar energy or burn some kind of fuel to transform horizontal airflow into vertical airflow.
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Wind power generation has three operation modes: one is independent operation mode , generally a small wind turbine powers one or more operating modes. households. It provides electricity to households, which use batteries to store energy to ensure energy consumption when there is no wind; second, wind power is combined with other power generation methods (such as diesel engine power generation) to power a unit, village or island; thirdement, wind energy Integrating into the operation of the conventional electricity network to supply the large electricity network, dozens, even hundreds of wind turbines are often installed in a wind farm. This is the main development direction of wind energy. generation.