Sliding Mode Pulse-Width Modulation-Based Direct Toque Control for Nine-Switch Inverter Dual-Induction Motor Drive

This paper proposes sliding mode pulse-width modulation (SMPWM) for the nine-switch inverter (NSI) as solution for the main drawback of voltage and current distortion. The proposed modulation is based on Lyapunov approach and can directly trigger the nine switches without restrictions and regardless of the operation frequency modes. SMPWM along with modified direct torque control-based sliding mode approach is designed for NSI driving dual-induction motor to obtain fixed switching frequency and low torque ripple. Stability analysis is carried out for each proposed method, and convergence condition depends on the value of dc-bus voltage that can be achieved. The feasibility of the proposed control is verified under load and speed conditions through simulation results.