In this paper, the maximum power tracking control problem is investigated for direct-drive permanent-magnet wind turbine generator under consideration of the system parameter uncertainty and external disturbance. A robust tracking controller is designed by utilizing the field-oriented vector of the rotor and nonlinear robust backstepping control technology, which regulates the rotor speed of wind turbine and generator by adjusting stator current of the torque component to achieve the maximal absorption of wind power and stable operation. Both the theoretical analysis and simulation illustration show that regardless of variable wind-speed, uncertain parameters and external disturbance, the proposed controller can guarantee the wind power system to achieve the maximal extraction of wind power on the secure and stable operation.%针对直驱永磁同步风力发电系统,考虑实际中存在的系统参数不确定性和外界干扰,研究了直驱永磁同步风力发电机最大功率跟踪控制问题.利用转子磁场定向矢量变换技术和鲁棒backstepping非线性控制技术及干扰抑制技术设计了一种鲁棒轨迹跟踪控制器,通过控制定子电流的转矩分量调节风电机转速,实现系统最大风能捕获和稳定运行.理论分析和与其他控制器的仿真比较结果均表明,所设计的控制器可以保证额定风速下系统参数存在不确定性和外部干扰时,风力发电系统仍能够实现安全可靠地最大获取风能的运行.
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