资源说明：In case of pitch control, blades can be tuned away from or into the wind as the captured power becomes too high or too low this is performed by rotating the blades, or part of them, with respect to their longitudinal axes. Below rated wind speed, blades are pitched for optimum power extraction whereas above the rated wind speed blades are pitched to small angle of attack for limiting the power. Advantages of this type of control are good power control performance, assisted start-up and emergency power reduction the biggest disadvantage is the extra complexity due to the pitch mechanism. In case of active stall control, the stall is actively controlled by pitching blades to larger angle of attack with wind speed above the rated value.

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