Three-Phase Capacitor Clamped Boost Inverter

Abstract

This paper introduces a new capacitor clamped three-phase dc–ac converter with an intrinsic step-up abilities by utilizing small passive components. This proposed inverter has several unique features, such as: 1) lower number of components’ count; 2) high dc–ac gain; 3) reduced voltage stresses on the capacitor; 4) offers better power quality (very low voltage and current total harmonic distortions) without any ac-side filter; and 5) reduced voltage stress on power semiconductor devices. Reduced voltage stress on capacitors leads to better reliability and enhanced lifespan of the inverter. The analysis of the proposed inverter is completed with the help of a mathematical model and state-space averaging model. This inverter performance under different test conditions is compared with the boost converter fed voltage source inverter, Z-source inverter (ZSI), quasi-ZSI (qZSI), switched boost inverter, improved ZSI, switched inductor-ZSI, diode-Assisted qZSI, capacitor-assisted qZSI, and extended boost ZSI; MATLAB Simulink results demonstrated that the proposed inverter capabilities are superior to the above-mentioned topologies. A 1200-W experimental prototype has been built to validate the feasibility and benefits of the system. The simulation and experimental results reveal that the proposed inverter offers better power quality, reliability, and high lifetime.