Performance Enhancement of Modular Multilevel Converter by using Modulation Technique

This paper presents the comparative analysis of modular multilevel converter by using a multicarrier modulation technique. The total harmonic distortion (THD) analysis has been done by using phase disposition-pulse width modulation (PD-PWM) and phase opposition disposition-pulse width modulation (POD-PWM) technique at a variable modulation index and fixed switching frequency. This analysis demonstrates that the POD-PWM technique provides improved harmonic performance and better response. The THD of MMC at a variable carrier frequency and unity modulation index has also been analyzed. It shows that THD is improved beyond the carrier frequency. All the results have been analyzed and verified with the help of Matlab/Simulink.