High-Efficiency Single-Phase Three-Level Bidirectional Inverter

This paper proposes a high-efficiency single-phase three-level bidirectional inverter. The proposed inverter has a three-level power switching circuit. It can reduce switch voltage stresses with low harmonic components. It has common-mode capacitors at the ac-filter to suppress the ground leakage current for high power quality. Its circuit operation and control strategy are described. Its common-mode circuit model is discussed. A 1.0 kW prototype has been designed and experimentally tested to verify the performance of the proposed inverter.