Modular multilevel converters (M2Cs) have become an interesting and attractive topology for DC/AC conversions and vice versa. This converter is an efficient power electronic converter for adjustable speed drives, high-voltage direct current transmission, renewable energy systems and large power supplies. For drive applications, a theoretical background is presented. This paper presents the comparative analysis of M2Cs based upon measurement of the total harmonic distortion under 5-level, 7-level, 9-level and 11-level M2C. The mathematical modelling and designing of an inductor–capacitor–inductor filter is proposed at the output for the harmonic reduction. The objective of the proposed overall system is to ensure that the voltage harmonic distortion at the point of common coupling is less than 5%.

模块化多电平转换器（M2C）已成为DC / AC转换的一种有趣且有吸引力的拓扑，反之亦然。该转换器是用于可调速驱动器，高压直流输电，可再生能源系统和大型电源的高效功率电子转换器。对于驱动器应用，提供了理论背景。本文基于在5级，7级，9级和11级M2C下对总谐波失真的测量结果，对M2C进行了比较分析。在输出端提出了用于减少谐波的电感-电容-电感滤波器的数学建模和设计。提出的整个系统的目的是确保公共耦合点的电压谐波失真小于5％。