Sze Sing Lee, Yam P. Siwakoti, Reza Barzegarkhoo, and Kyo-Beum Lee, "A Five-Level Unity-Gain Active Neutral-Point-Clamped Inverter Designed Using Half-Bridges," in Proc. IPEC (ECCE-Asia) Conf., May 2022, pp. 859-866. > Paper

This paper proposes a novel 5-level active neutral-point-clamped (ANPC) inverter that doubles the voltage gain of the conventional topology from half to unity. Each phase of the proposed topology is constituted by three half-bridges that control a flying capacitor to generate 5 symmetrical ac voltage

levels. Natural voltage balancing of dc-link and flying capacitors in the proposed topology implies that the sensors and voltage balancing controller

commonly used in the conventional ANPC inverter is no longer necessary. In addition to switch count reduction, the most noteworthy merit of the

proposed topology is its ease of implementation with commercial half-bridge modules, where the design of dedicated circuit is not needed. The

operation of the proposed 5-level unity-gain ANPC (5L-UGANPC) inverter is analyzed and validated through simulation and experimental tests.