Active fault tolerant control design using switching linear parameter varying controllers with inexact fault-effect parameters

In this article, a novel active fault-tolerant control (AFTC) design method is developed by using the switching linear parameter varying (LPV) controller with inexact fault-effect parameters. The LPV controller is not only considered as a gain-scheduled controller varying with the operating points, but also an AFTC controller varying with the fault-effect parameters, which can be obtained via the fault estimator in real-time. The inexact measurement of fault-effect parameters is considered for the first time in this article. To cover large parameters variation, a class of switched LPV fault-tolerant controller is designed to work in the multiple partitioned parameters subregions. The dynamic output feedback controller model is constructed to perform the switched LPV fault-tolerant control task under the mode-dependent average dwell time constraint. By using the multiple parameter-dependent Lyapunov function approach, sufficient conditions with less conservatism are obtained, such that the corresponding closed-loop systems are globally uniformly exponentially stable and satisfy an upper bound of weighted l2-gain performance indexes. Finally, effectiveness and applicability of the developed approaches are validated via an active magnetic bearing system.