The problem of globally quadratic stability of switched nonlinear systems in block-triangular form under arbitrary switching is addressed. Under the assumption that all block-subsystems are zero input-to-state stable,...The problem of globally quadratic stability of switched nonlinear systems in block-triangular form under arbitrary switching is addressed. Under the assumption that all block-subsystems are zero input-to-state stable, a su?cient condition for the problem to be solvable ispresented. A common Lyapunov function is constructed iteratively by using the Lyapunov functionsof block-subsystems.展开更多
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,...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。展开更多
基金Supported by Natural Science Foundation of P.R.China(60274009),the Foundation for Docto(r2a)lSpecial Branch by the Ministry of Eduction of P.R.China(20020145007),and Natural Science Foundation ofLiaoning Province(20032020)
文摘The problem of globally quadratic stability of switched nonlinear systems in block-triangular form under arbitrary switching is addressed. Under the assumption that all block-subsystems are zero input-to-state stable, a su?cient condition for the problem to be solvable ispresented. A common Lyapunov function is constructed iteratively by using the Lyapunov functionsof block-subsystems.
文摘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。
