求翻译：本文首先在对风力发电原理，风电机组研究的基础上从变桨距风力机空气动力学研究入手，分析了变桨距控制的基本规律，再结合目前国内主流的变桨距控制技术分别设计出了液压变桨距控制，电动变桨距控制的方案，最后在此基础上提出了一种较为理想的控制策——半桨主动失速控制。是什么意思？

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