Due to the specific system properties of large scale variable speed wine turbines in region-3 where the aerodynamic properties vary with the pitch. The control strategy based on the sensitivity of the power-pitch is proposed. Though designing the PID controller with blade-pitch control, the closed system with the deviation of the electromagnetic power and the rotor speed is obtained. The control model is applied in a set of parameters of a 5 MW wind turbine. The simulated results based on the MATLAB show that the proposed control strategy restrains the impacts of the total system caused by the wind disturbance in region-3. Meanwhile, the output power and the rotor speed to the ratings with slight fluctuations are maintained. Moreover, both the dynamic and the steady-state performances are improved. Therefore, the quality of the power generation is improved, and the theoretical basis of the grid connected wind turbine is obtained.%针对大型变速变桨风力机在高风速区的气动性能随桨距角变化而改变的特性,文章提出了一种功率-桨距角变化的灵敏度控制策略.通过设计功率灵敏度因子调节PID变桨距控制器,建立输出功率偏差与风轮转速偏差的闭环系统.将提出的策略应用到某5 MW风机的参数模型中,利用MATLAB平台进行仿真验证.结果表明,提出的控制策略抑制了高风速区的扰动风速对系统的影响,使输出功率和风轮转速保持在额定值附近且波动很小,提高了系统的动态性能和稳态性能,同时提高了发电质量,并为风电机组并网需求奠定了理论基础.
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