Simultaneous Design Of Fault-tolerant Control And Anti-disturbance Control Under Actuator Saturation

Faults in industrial production processes often lead to system instability,and their consequences may cause damage to technical components,personnel,or the environment.In addition,saturation,as a type of nonlinear characteristic,is ubiquitous in practical systems,and the saturation problem poses a great difficulty for an effective control system.Therefore,it is important to study the stability of actuator saturated systems.This paper focuses on simultaneous faulttolerant control and anti-disturbance control under actuator saturation:1.The problem of simultaneous fault-tolerant control and immunity to disturbances for systems with polynomial faults is investigated.Unknown external disturbances are considered as caused by external source systems,and faults can be expressed as polynomial functions of time.Combining a fault observer and a disturbance observer,a controller is designed to both diagnose faults and improve the immunity to disturbances.Finally,the effectiveness of the results was verified through simulation examples.2.The problem of simultaneous fault detection and disturbance suppression control for a class of linear time-invariant systems is investigated.In the fault detection framework,the residual generator requires robustness to the disturbances present in the system.Different from most of the existing simultaneous fault and control methods,simultaneous fault detection and disturbance reject control rejects the influences of disturbances on residual generators by disturbance observerbased control.This not only effectively improves the accuracy of fault detection,but also solves the problem that most of the existing simultaneous fault and control methods require that the disturbance must be bounded.Finally,the effectiveness of the method is verified by numerical arithmetic examples.3.The problem of fault detection and anti-saturation control of discrete-time systems is studied.Actuators are saturated in many industrial control systems.In the fault detection process,the designed residual generator not only accomplishes the fault detection task but also overcomes the effect of actuator saturation on the system performance.In addition,the influence of uncertain system parameters and external disturbance signals on the residual generator needs to be suppressed in this process to effectively improve the accuracy of fault detection.From the discussion in the final simulation example,we can safely conclude the effectiveness of simultaneous fault detection and anti-saturated control.