二极管箝位型多电平逆变器作为一种应用于高压大功率变换场合的变换器，其PWM控制技术是研究的核心内容之一。本文针对已有载波PWM方法中低调制度下电平退化的问题，提出了一种新颖的载波PWM方法，既便是在低调制度下，所有的电平都能够得到应用。仿真结果表明，这种方法可以提高二极管箝位型逆变器在低调制度下的器件利用率，使得逆变器在低调制度下工作于较高频率。

Diode-clamped multilevel inverter is a kind of power converter which can be used in high voltage and high power application field.  Its corresponding PWM control is studied extensively.  The paper presents a novel carrier-based PWM method to take advantage of all levels in the inverter even at low modulation indices.  The simulation results indicate that the novel PWM strategy increases device utilization and enables the inverter to switch at higher frequencies and low modulation indices.

辛想（1982－），男，山东济宁市人，山东大学控制科学与工程学院研究生