Abstract
High frequency fluctuation in common-mode (CM) voltage of the modular multilevel converter (MMC) causes serious CM conducted electromagnetic interference (EMI), which could damage the load motor and shorten its service life. To suppress the CM EMI in the MMC, the chaotic carrier phase shifted sinusoidal pulse width modulation (CPS-SPWM) is proposed for the MMC by introducing the idea of chaotic PWM into CPS-SPWM. The chaotic CPS-SPWM is used to suppress CM EMI by spreading the carrier frequency with a chaotic sequence in a given range, thereby reducing the peaks of CM EMI spectrum. This paper builds a 5-level MMC simulation platform based on MATLAB/Simulink. The correctness and effectiveness of the chaotic CPS-SPWM to suppress CM EMI of the MMC is verified by the simulation results. This paper provides a new way for improving the CM EMI in the MMC.
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