Abstract: In low power renewable systems, a single-phase inverter is usually adopted. This project deals with a Seven-Level inverter topology that follows this trend. A review of the state of the art of the Seven-Level topologies and a theoretical power loss comparison with the proposed solution is realized. The proposed inverter architecture is based on a full-bridge topology with two additional power switches and two diodes connected to the midpoint of the dc link. Since the two added levels are obtained by the discharge of the two capacitors of the dc link, the balancing of the midpoint voltage is obtained with a specific pulse width modulation (PWM) strategy. Simulation and experimental results show the effectiveness of the solution.

Keywords: Switch Reduction, 7 Level Inverter, Total Harmonic Distortion, H-bridge multilevel inverter.