Sliding Mode Control of Induction Motor Drive Based on Feedback Linearization

In this paper, sliding mode control theory is demonstrated to design and control the rotor speed and rotor flux of the feedback linearized induction motor (IM) drive. Dynamic equations of the IM in stationary reference frame are linearized using feedback linearization control technique. Direct differentiation method is being used for the linearization of dynamic model of IM. First, rotor speed and flux are decoupled through proportional-integral (PI) regulator and the resultant controlled variables are fed to the feedback linearization controller. To improve the dynamic performance of the motor, sliding mode flux and speed controllers are proposed. The model has been simulated using MATLAB/Simulink and validated experimentally using dSpace1104 controller board, inverter, and IM in the laboratory. Results clearly indicate the effectiveness of the proposed controller over PI controllers at different operating conditions such as load disturbance and speed reversal is analysed and compared in real time.