中文摘要：

针对风电机组变桨距控制的特点，提出一种基于电液行星锥齿马达的变桨距控制方式，采用液压马达驱动与锥齿直接减速方式变桨距控制．设计电液行星锥齿马达变桨距机构及其电液控制系统，提出基于电动机一变量泵一比例阀的协同变桨距控制方案，构建系统等效控制模型．同时，针对变桨距的大惯性、非线性、强干扰等特征，设计新型的桨距角控制器和变桨距控制器，构建系统仿真模型，进行对比仿真研究．结果表明该变桨距控制方式的可行性和有效性．

英文摘要：

This paper presents a novel pitch control system based on an electro-hydraulic planetary bevel gear motor according to features of the wind turbine pitch system. This system implements the pitch control motion by using hydraulic motor and bevel gear based direct velocity reduction method. A pitch mechanism and the associated electro-hydraulic control system have been designed in this paper. A motor- pump-proportional valve based combined control strategy and the equivalent control models have been also presented. Moreover, two novel pitch angle controllers based on GRNN neural network and nonlinear PID control strategy were proposed to deal with the large inertia, nonlinear characteristics and strong disturbances in this system. Comparative mathematical model based simulation results have verified the effectiveness and feasibility of this pitch control system.