Efficiency has nothing to do with wind speed, and high efficiency can be achieved at low wind speeds. (The efficiency of the mechanical parts is not considered)
According to the conservation of energy, the power of the wind turbine is related to the wind speed
According to aerodynamics and Bates limit theory, the wind energy utilization rate of the wind turbine The limit is 59%
Each wind turbine has a fixed maximum wind energy utilization rate. This efficiency is related to the tip speed ratio of the wind turbine (the ratio of the blade tip speed to the current wind speed)
For example, an optimal tip speed ratio (that is, the tip speed ratio when the highest wind energy utilization rate is achieved) is 9 The wind turbine has a wind rotor diameter of 100m and a wind turbine speed of 12 rpm. It is most efficient at 3.14*100*12/60/9=7m/s