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针对一类具有执行器故障的非线性切换系统,研究基于系统状态估计和故障重构的容错控制问题.首先,在具有平均驻留时间(ADT)的切换信号下,设计一种切换PI观测器作为状态-故障估计器,以达到对系统状态和故障同时渐近估计的目的;其次,基于线性矩阵不等式,给出非线性切换系统观测器存在的充分条件;再次,基于PI观测器给出的状态和故障估计,提出一种非线性切换系统的容错控制器设计方法;最后,以一个电子电路为仿真实例进行分析,验证了所提出方法的可行性和适用性.
Aiming at a class of nonlinear switching systems with actuator faults, fault-tolerant control problems based on system state estimation and fault reconstruction are studied.Firstly, under the switching signal with average dwell time (ADT), a switching PI observer As a state-fault estimator to achieve the simultaneous asymptotic estimation of system states and faults. Secondly, based on the linear matrix inequality, sufficient conditions for the existence of observers in nonlinear switched systems are given. Thirdly, based on the PI observers State and fault estimation, a fault-tolerant controller design method for nonlinear switching system is proposed. Finally, an electronic circuit is used as an example to verify the feasibility and applicability of the proposed method.