Low Ripple Predictive Torque Control of MLI-Fed Induction Motor for Marine Propulsion Systems

This paper presents an improved model predictive torque control (MPTC) approach with reduced torque and flux ripples capability for multilevel inverter-fed motor drives in marine propulsion systems. The control strategy takes the average trajectories of the control variables in the prediction process to enhance model accuracy and minimize computational errors. This reduces torque and flux prediction errors, leading to decreased torque and flux fluctuations. Additionally, a Heun-based model is also developed for flying capacitor voltages to mitigate voltage ripples. Simulation studies are conducted on a four-level inverter-fed motor drive to validate the effectiveness of the proposed MPTC and its performance is compared with the existing MPTC method.