Comparative Analysis of Speed Control of Induction Motor Using MPCC and FOC

Abstract

            In this paper a comparative analysis of speed control based on Model predictive control (MPC) and Field oriented control (FOC) schemes on induction motor drive has been established. This work proposes two scheme for speed control of induction motor drive one of which is Field oriented control (FOC) which is basically based on vector control mostly used nowadays for IM drive control, second scheme is based on Model predictive (MPC) which is considered as a powerful substitute of field-oriented control (FOC) and direct torque control (DTC) in high performance operation of AC motor drives. The use of current proportional-integral (PI) controllers and pulse-width modulator are omitted in MPC scheme, which are mandatory in FOC. Hence, very quick dynamics response is the most attractive feature of the MPC scheme. Compared to FOC, the heuristic switching look-up table is replaced by a simple cost function to select the best switching state. This leads to better steady-state performance than FOC. Moreover, various non-linear constraints and multiple variables can be controlled simultaneously by inclusion of some additional terms in cost function. The MATLAB/SIMULATION results prove the proposed control scheme can be adapted for a wide speed range with precision simultaneously meeting the load torques up to the rated values in motoring mode.