EXPERIMENTAL INVESTIGATION OF PASSIVE FAULT TOLERANT CONTROL FOR INDUCTION MACHINE USING SLIDING MODE APPROACH

This paper presents a passive fault tolerant control approach dedicated to stator inter-turn short-circuit fault of an induction machine. This control is based on sliding mode strategy and is implemented for validation on real-time data acquisition and control platform. The proposed work highlights the integral sliding mode controller benefits during healthy and faulty operations. It can make the induction machine outputs to track their desired reference signals in finite-time and allows to obtain a better dynamic response performances even in presence of fault. Moreover to avoid the use of a flux sensor, a second order sliding mode observer is used to estimate the rotor flux. Since the used observer converges in finite time, the closed-loop stability of the proposed system (controller+observer) is proved using the Lyapunov stability theorem. Experimental results are conducted for squirrel cage induction machine to highlight the efficiency and applicability of the proposed fault tolerant control.