Unknown input observer-based active fault tolerant control for induction machine

Abstract

This paper proposes an unknown input observer scheme based active fault tolerant control for induction machine with inter-turn short-circuit fault. This method is developed using a backstepping controller which can make system outputs to track their desired reference signal in finite-time and obtain a better dynamic responses and performances. The closed-loop stability is established based on Lyapunov function. An unknown input observer is developed not only to estimate the machine states but also to detect the inter-turn short-circuit fault. When the fault is detected, a signal alarm is provided to trigger the switch between measured stator current and estimated ones. The backstepping controller will be reconfigured in order to compensates the inter-turn short-circuit fault impact. Simulations were performed in MATLAB/Simulink environment to highlight the designed approach performances and robustness with respect to inter-turn short-circuit fault occurrence.