Fuzzy Variable Structure Control of a Six Phase Induction Generator

In this paper, we propose a combination between variable structure and fuzzy logic controllers to reduce the chattering phenomenon caused mainly by the signum function of the discontinuous control part. This association will be designed to regulate the inner current loops of a symmetrical six-phase induction generator in such a way to ensure the same robustness of the controlled system under healthy and faulty conditions (one to two opened stator phases). For this, the signum function of the variable structure controller will be substituted by a fuzzy system based on the theory of the sliding mode system. Experimental results show the effectiveness and the robustness of the proposed combination in healthy and faulty modes.