When the wind speed is lower than the rated wind speed, the blade pitch angle = 0°. Through the variable speed constant frequency device, the generator rotor speed is changed when the wind speed changes, so that the wind energy utilization coefficient is constant at the maximum and the maximum wind energy is captured; When the wind speed is higher than the rated wind speed, the blade pitch angle is adjusted to increase, thereby reducing the impeller input power and stabilizing the generator output power at the rated power.
The main purpose is to track the optimal tip speed ratio