Fault estimation of continuous-time switched affine systems with actuator faults under dwell time constraint

This paper investigates the problem of fault estimation for a class of continuous-time switched affine systems with actuator faults. In most of the existing results of switched affine systems based on the min-switching approach, the candidate Lyapunov function is usually common, such that it is conservative to derive the practical stability conditions. To overcome this restriction, a class of switched Lyapunov function is introduced to increase more degrees of freedom of the designed min-switching strategy and to ensure the stability of error systems. At the same time, the proposed dwell-time dependent switching strategy can avoid the frequent switchings commonly existing in the min-switching mechanism. Then, a new intermediate estimator is designed to estimate the state and fault simultaneously, and the intermediate estimator based fault estimation is performed under the proposed mixed switching law. Moreover, the gains of fault estimator are explicitly calculated via resolving the conditions of linear matrix inequalities. Finally, two examples including a flyback DC-DC power converter are illustrated to verify the effectiveness and advantage of proposed fault estimation approach.