【摘要】 针对非线性风能转换系统(Wind Energy Conversion System,WECS),设计滑模观测器,实现执行器的故障检测。首先,建立风力发电系统的数学模型,并将其状态方程中的非线性项拆分出来,作为不确定部分,设计了一种非线性滑模状态观测器。然后,通过非线性滑模观测器来产生对不确定部分具有鲁棒性和对执行器故障具有敏感性的输出误差,以输出误差作为残差来判断系统的故障是否发生,从而达到执行器故障检测的目的。最后,利用李雅普诺夫稳定性理论,对所设计的非线性滑模观测器的稳定性进行了证明,并通过对该系统进行仿真验证了控制策略的有效性。更多还原

【Abstract】 In this paper, a sliding mode observer used for actuator fault detection is designed for the nonlinear wind energy conversion system. First the paper builds the mathematical mode of wind energy conversion and designs a nonlinear sliding mode observer from splitting the nonlinear proportion of state equation of the wind energy conversion system. Then the residual which is robust to disturbance and sensitive to actuator fault directly is produced by the nonlinear sliding mode observer. The residual can be used to judge whether actuator fault happens, thereby detect the actuator fault. Finally the proposed nonlinear sliding mode observer has been proved to be stable by using Lyapunov stability theory and the control strategy has been demonstrated from simulation studies.更多还原