Model Reference Adaptive Control of a Vector Controlled Three Phase Induction Machine

Abstract

Model reference adaptive control (MRAC) of three-phase induction machine in rotor field coordinated is proposed in this paper. The proposed adaptive structure is in direct form, such that the controller parameters are obtained on-line. The adaptive mechanism of the parameters is obtained by additive composing of two terms: the first will support a gradient adjustment law and the second will comport an adjustment that includes a sigmoid function specific for variable structure control. The last component improves the transient and steady state response by eliminating the small oscillations of the closed loop response around the equilibrium state in order to obtain a zero tracking error. The adaptive mechanism assures the robustness to the external disturbances and to the unmodeled dynamics. Matlab/Simulink based simulation results will show the effectiveness of the proposed solution.