A Comprehensive Study of Common Mode Voltage Reduction and Neutral Point Potential Balance for a Back-to-Back Three-Level NPC Converter

A comprehensive study of common-mode voltage (CMV) reduction and neutral point (NP) potential balance for a back-to-back three-level NPC converter is proposed in this article. Based on phase-disposition PWM, a zero-sequence voltage (ZSV) injection method is adopted. The ZSV is divided into two parts: ZSV for CMV reduction, and ZSV for NP potential balance. The specific selection method is discusse...