额定风速以上风力发电机组的恒功率H∞鲁棒控制

H-infinity robust control of constant power output for the wind energy conversion system above rated wind

风力发电机组由于机械结构以及电气负荷承受能力的限制存在着转速限制和功率限制,额定风速以上时,需要通过控制桨距角来实现额定恒功率输出,同时保持转速在额定转速处.本文建立了风力发电机组的详细机理模型,将H∞控制理论应用到额定风速以上时风力发电机组的恒功率输出的控制器设计,建立了标准H∞恒功率控制问题.利用LMI方法求解,得到了桨距角的H∞控制器.仿真结果表明该H∞控制器能够成功实现额定风速以上时的恒功率输出控制,并且具有良好的鲁棒性.

There exist limits in speed and power because of the mechanical load limit of the mechanical structure and the electric load limit of the electric components. When the wind speed is above the rated value, pitch angle is regulated to maintain the constant power output and the constant rotor speed. After the complete nonlinear mathematical model for the wind energy conversion system is established, H-infinity robust control theory is applied to realize the rated power output above the rated wind. The rated power output problem is transformed to a standard H-infinity problem. The LMI method is used to design the desired pitch controller. Simulation results show that rated power output is maintained by the controller above the rated wind. The controller is robust even there exists an uncertai .