Modified Super-Twisting Sliding Mode Speed Controller for Predictive Control of Induction Motor

Abstract

The paper deals with modification of super-twisting algorithm in sliding mode speed controller for predictive control of induction motor. At very-low-speed and/or high-load torque regions, the conventional proportional-integral controller gives poor speed response performance. In order to enhance the performance, sliding mode control (SMC) is deployed. However, the conventional SMC often owns high-chattering control signal. Super-twisting algorithm is utilized to reduce the chattering. In order to obtain high accuracy of the speed response, boundaries of the disturbance term and its time derivative are defined using dynamic equation of the motor. Simulations with the predict control of three controllers confirm the superior performance of the proposed super-twisting algorithm in terms of normalized integral time absolute error and relative final error of the motor speed.