对于控制系统，建立了传感器、节距调节器、转速PI控制器、转矩PI控制器、节距PI控制器等的数学模型。
To the control system, The mathematics model of transducers, blade actuator, PI controller to rotate speed, PI controller to the torque, PI controller to the blade angle are established.
数字仿真表明，在风速低于额定风速时变速运行捕获能量比恒速运行捕获能量大；节距调节控制可以很好地使输出功率稳定在额定功率左右。
The simulation results indicate that wind turbine is operated at maximum power coefficient with variable-speed mode and the output power of generator is kept around rated power with pitch control.
带轮运行一定时间后，槽的宽度可以调节，这样带轮的节距是变化的，因此需要进行适当的调整以满足速度比的要求。
Pulleys are on the market that permit an adjustment in the width of the groove. The effective pitch diameter of the pulley is thus varied, and moderate changes in the speed ratio can be secured.
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