摘要：本文提出了一種優(yōu)化空間矢量脈寬調(diào)制方法來抑制光伏并網(wǎng)逆變器中產(chǎn)生的共模電壓。在分析共模電壓產(chǎn)生機(jī)理的基礎(chǔ)上，對通常SVPWM調(diào)制技術(shù)進(jìn)行改進(jìn), 調(diào)整了有效矢量的選擇范圍, 并對開關(guān)次序進(jìn)行優(yōu)化。該空間矢量合成算法克服了SPWM調(diào)制存在的母線電壓利用率低，線性調(diào)制區(qū)小的問題。仿真結(jié)果表明，該算法可以將共模電壓幅值抑制到普通SVPWM算法的1/2，具有良好的有效性和實(shí)用性。 敘詞：三電平逆變器 二極管中點(diǎn)箝位式 共模電壓 SVPWM Abstract：In this paper, an optimization SVPWM method is used to restrain the common-mode voltage generated in grid-connected PV inverters. Based on the analysis of the generated mechanism of the common-mode voltage, the normal SVPWM modulation technology is improved by adjusting the range of choose effective vector and optimizing the switching order. The simulation results show this algorithm can suppress common-mode voltage amplitude low to 1/2 of the general SVPWM algorithm. Keyword：Three-level inverter, NPC, Common mode voltage, SVPWM