A Single-Phase Single-Stage Five-Level Common-Ground Transformerless Inverter with Six-Switches and Switched-Capacitor Cell

This paper proposes a single-phase single-stage five-level transformerless common-ground inverter with reduced output harmonic content. It can eliminate the leakage current and reduce the total number of components comparing with traditional five-level inverters. A switched-capacitor cell is applied to ensure the output voltage can be lifted. The operation principle of the proposed inverter and the simple carrier-based modulation strategy are introduced. Meanwhile, the key theoretical design of capacitors is analyzed. Finally, the experimental results as well as an efficiency curve are given to corroborate the feasibility.