Control of the Quasi-Z-source inverter using model predictive control

Abstract

This dissertation presents a comprehensive study of the quasi-Z-source inverter (qZSI) and its control using Model Predictive Control (MPC). The study begins by examining the structural characteristics and operational principles of the Z-source inverter family, with a particular focus on the quasi-ZSI due to its improved performance, continuous input current, and reduced component stress. Various control strategies are reviewed, with special emphasis on the predictive control approach. The MPC strategy is modeled and implemented to enhance system performance by minimizing tracking error and managing switching behavior. A detailed simulation study is conducted using MATLAB/Simulink to verify the effectiveness of the proposed control scheme. The performance is evaluated under varying load conditions in terms of inductor current output and its stability, demonstrating the technique’s ability to improve output quality and ensure stable operation even under low input voltage conditions.