Sensor Fault Detection and Fault-Tolerant Control for Buck Converter via Affine Switched Systems

The main purpose of this paper is to study the problem of the sensor fault detection and fault-tolerant control for DC–DC buck converter via affine switched systems. First, the buck converter is model as a switched system model, and a robust fault detection observer with a prescribed
$H_{\infty }$
performance index is designed to produce a residual signal. The residual signal can be used to construct the residual estimation function. Second, fault detection logic is introduced which compares the threshold with the residual estimation function, and the sensor fault detection can be achieved. Third, once the sensor fault is detected, fault-tolerant control can be achieved through the method of system reconfiguration. This method enables the system to achieve asymptotic stability in a new system under the sensor fault. Finally, to show the feasibility of the fault detection and fault-tolerant control, the simulation results of three kinds of sensor faults including open-circuit, gain deviation, and noise abnormity given in this paper.