Discrete-Time Quasi-Sliding Mode Control of Induction Motors

This paper proposes a discrete-time sliding mode control approach used for discrete-time or digitalized continuous systems. After analyzing the reaching phase and quasi-sliding mode, a new discrete-time sliding mode control approach is presented to force the system to move to the quasi-sliding mode band within finite-steps and maintain in the band thereafter. The proposed approach can enhance the dynamic speed towards the quasi-sliding mode band and increase the robustness to internal parameter variations and external disturbances. The proposed control strategies are utilized to control the speed of induction motors. The simulation results validate the proposed approach, and faster error convergence and higher steady-state accuracy are achieved.