High-order sliding mode control with hyperbolic evaluation function for improving performances of a squirrel-cage induction motor fed by a two-level inverter

This article compares first-order sliding mode control (FOSMC) with second-order sliding mode control (SOSMC) for squirrel-cage induction motor using two-level inverter. Investigating the renowned robustness of sliding mode control in handling uncertainties and disturbances, the study focuses on precision, tracking speed, robustness, and chattering reduction. Each control approach employs two evaluation functions, saturation (Sat) and hyperbolic tangent (Th). Simulations in MATLAB/SIMULINK assess motor stability under several conditions and disturbances, applying the Lyapunov criterion. The results highlight sliding mode control's superior robustness, especially with the hyperbolic tangent function in FOSMC while significantly reducing response time. Furthermore, SOSMC demonstrates improved tracking accuracy and minimized chattering with only two control loops than FOSMC with four loops. Simulation results validate the proposed technique, showcasing remarkable dynamic performance. This study offers valuable insights into selecting and implementing sliding mode control for squirrel-cage induction motors.