Dynamic Observer-Based Fault-Tolerant Control for Switched Stochastic Nonlinear Systems With Nonlinear Exogenous Disturbance

The problems of fault estimation (FE) and fault-tolerant control (FTC) of switched stochastic systems with multiple faults and nonlinear exogenous disturbances are studied. A dynamic FE observer and a nonlinear dynamic disturbance observer are proposed, which can reconstruction the system state, faults, and disturbance generated by the nonlinear exogenous system. The integrated FE and FTC are considered, and the one-step LMI conditions are obtained, which can avoid estimation errors affecting the system, and solve the coupling of observer parameters and controller parameters. By introducing the information of the output and its derivatives simultaneously, the estimation and control accuracy is improved. At the end of this article, two simulation cases are given to prove the practicability of this article.