Pitch anglecontrolsystem can change pitch, accordingly regulate the rotational speed and output power by adjusting blade incidence of wind-driven device.
变桨距是通过改变风力机叶片桨距角来改变风力机的转速，从而调整发电机输出功率。
2
The difficult problem of the automatization of measurement and CDntrol in the large low speed wind tunnel is an automatization of large power system and large Anglecontrolsystem.
大型低速风洞测控自动化的难点是大型动力系统的自动化和大型变角控制系统的自动化。
3
The roll Angle is constrained by the controlsystem.