Optimal current quality of a single-phase multilevel inverter with a staircase modulation

Abstract

The authors address the problem of optimal current quality for a single-phase multilevel inverter with a staircase modulation (Fig.1). The current quality is characterized by current ripple Normalized Mean Square (NMSc). The goal is to find theoretically optimal switching angles and respective minimal NMSc values. The previous research didn't provide comprehensive solutions for arbitrary modulation indices and level counts.