基于模糊PID的风力发电机组变桨距控制研究

摘要

为了提高变桨距控制系统对风力发电机组的跟踪控制精度，同时避免局部极小值问题，针对常规PID控制难以实现风力发电机组控制效果，首先建立了风力发电机组变桨距的动态模型，在分析风力发电机组变桨距控制要求的基础上，提出了一种基于模糊PID的变桨距控制方法。该方法将模糊与PID相结合这样有效的弥补常规PID的不足。在随机风作用下对机组的模糊PI控制器进行仿真，仿真结果表明该模糊PI控制器具有良好的动态性能及对风速扰动的鲁棒性，能够有效改善风力发电机组的变浆距系统控制效果。%A dynamical model of pitch control device for wind turbine generator system was built to improve the tracking control accuracy of the pitch control device for wind turbine generator system and avoid the local minimum. Based on analyzing characteristics of the model and requisitions of the pitch control for wind turbine generator system,a pitch control approach based on fuzzy PID is presented. The fuzy and PID are combined in the approach to remedy the insufficient of conventional PID. A simulation of the fuzzy PID controller was carried out under random wind speed. The result shows that the controller has a good dynamic performance,strong robustness and adaptability.