Variable structure controller and observer applied to induction machine

This paper proposes the control of an induction machine in field coordinates with imposed stator current based on the theory of variable structure control and sliding mode. We describe the model of an induction machine in field coordinates with imposed stator current, and show the design of variable structure control and sliding mode to achieve a desirable dynamic performance of that plant. To estimate the inaccessible states we use a state observer (estimator) based on field coordinates induction machine. We present the results of simulations in any operation condition (start, speed reversal and load) and with parameters variation of the machine compared to a PI control scheme