Abstract

Common-mode voltage (CMV) has several negative effects on photovoltaic (PV) grid-connected systems and motor drives. To reduce CMV, converter topology improvement draws great interest, such as the novel three-level H8 converter topology. This converter has the potential to achieve low CMVs, but it suffers from CMV jumps during dead-time (DT), which is detrimental to the reduction of CMV. To solve this problem, this article proposes a three-level H10 converter and its modulation techniques considering the DT effect. First, by choosing a suitable combination of space vectors, two reduced CMV modulations (RCMVMs) are introduced. Second, to eliminate CMV jumps during DT when entering and leaving the zero voltage vector (ZVV) in RCMVMs, an H10 topology with control strategy, which applies active voltage vector (AVV) to ZVV period, is proposed. Finally, the applicable conditions of control strategy are analyzed. Simulation and experimental results are provided to demonstrate the effectiveness of the proposed scheme.