Speed and torque control of induction motor by using robust H∞ mixed-sensitivity problem via T-S Fuzzy model

Abstract

In this article we investigate on robust mixed-sensitivity H∞ control for speed and torque control of induction motor (IM). In order to simplify the design procedure the Takagi-Sugeno (T-S) fuzzy approach is introduced to solve the nonlinear model Problem. Loop-shaping methodology and Mixed-sensitivity problem are developed to formulate frequency-domain specifications. Then a regional pole-placement output feedback H∞ controller by using linear matrix inequalities(LMIs) teqnique for each linear subsystem of IM T-S fuzzy model is employed. Parallel Distributed Compensation (PDC) is used to design the controller for the overall system. Simulation results are presented to validate the effectiveness of the proposed controller even in the presence of motor parameter variations and unknown load disturbance.