Three Different Relative Degrees Sliding Mode Control for Robust DTC Control of Induction Motor Drives

This paper proposes three new slidingmode algorithms with three different relative degrees to improve the responsetime and reduce the effects of speed variation and load disturbances ofconventional PI_DTC control for induction motor drive. The numerical simulationresults using Matlab/Simulink environment are presented to validate the efficiency and superiority of each proposed sliding mode algorithms. The threesliding mode strategy demonstrates better dynamic performance compared to theconventional PI controller. The 1st relative degree sliding mode controller(1RD_SMC) reduced torque ripples, which are the main shortcoming of DTCcontrol, and eliminated torque shock due to speed variations and loaddisturbances, while the 2nd relative degree sliding mode controller (2RD_SMC)and integral sliding mode controller (ISMC) showed superiority in terms offastest response time and small steady-state error.