A Novel Common-Mode Voltage Suppression VSVPWM Modulation Strategy Based on NPC Three-Level Inverter
ZHAO Jun
LIAN Zhen
CHEN Haijian
Abstract：The neutral-point clamped three-level inverter was widely used in fields such as motor control and renewable energy generation.However,it faces issues of neutral-point potential imbalance and high common-mode voltage.To address these two problems,a novel VSVPWM strategy was proposed.Based on the low common-mode voltage switching state switching criterion was proposed,the novel VSVPWM strategy defines new virtual small vectors and virtual medium vectors.This modulation strategy can effectively achieve neutral-point potential balance and common-mode voltage suppression.Furthermore,it overcomes the problems of simultaneous action of two-phase bridge arms in each switching cycle and switching state transitions during region switching in the traditional RCMV_VSVPWM strategy,improving the quality of output electrical energy and enhancing system reliability.Experimental results verify the effectiveness and superiority of the strategy proposed in this paper.
Keywords：three-level invertervirtual space vector modulationneutral-point potential balancereduced common-mode voltage
Publication Date：2025-10-30
Online Publishing Date：2025-12-24(First online date of this platform, not the publication date of the document)
Pages：8( 37-44 )