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。
Pitch angle control system can change pitch, accordingly regulate the rotational speed and output power by adjusting blade incidence of wind-driven device.
通过风力机空气动力学分析和模型研究，为变桨距控制提供了理论基础。
Based on the research of wind turbine aerodynamics characteristics, a model was established and the theoretical foundation of pitch control was built.
首先对风力机空气动力学和变桨距控制过程进行了探讨，为系统的设计及控制策略的研究提供理论基础。
First, wind turbine aerodynamics and variable pitch control process was discussed to provide theoretical studying basis for studying of the system design and control strategy.
首先对风力机空气动力学和变桨距控制过程进行了探讨，为系统的设计及控制策略的研究提供理论基础。
First, wind turbine aerodynamics and variable pitch control process was discussed to provide theoretical studying basis for studying of the system design and control strategy.
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