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中文摘要：
提出恒压网络电液变量马达的风力机变桨距控制技术，通过调节接人到恒压网络中变量马达的排量来控制变桨转矩和方向，并适应变桨载荷的变化。在此基础上，构建了系统数学模型，分析了其双闭环的桨距角位置控制特性和参考桨距角的模糊给定策略，并进行了仿真实验。结果表明，变量马达变桨距的响应速度较快，可将传动链转矩稳定于额定值的5％以内，将功率稳定于额定值的6％以内。相比于常规变桨距方式，该方式变桨效率较高，功率和转矩控制的准确性较好。
英文摘要：
A novel pitch control system is proposed for wind turbine to stabilize the drive-train power and torque fluctuations. This system is based on a constant pressure network and a hydraulic motor with variable displacement. The desired pitch control motions and directions can be achieved by regulating the displacement of the hydraulic motor to adapt to the varying loads acting on the blade. Mathematical model and a detailed analysis for the control characteristics of the system are provided. Further, a double control loop for position feedback is proposed to accurately track the desired pitch angle which is obtained based on fuzzy reasoning. Experimental results have demonstrated that this system can effectively control the power and driver torque, and consequently maintain the output power and torque on the rated values. In addition, this novel system has the advantages of high power versus volume, energy-saving and is particularly suitable for large scaled individual pitch controlled wind turbine.
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