Abstract

Electromagnetic interference (EMI) is a serious problem for Modular Multilevel Converter (MMC). The large quantity of switching devices in MMC bring in lots of EMI sources which are associated with modulation strategies. Two most commonly used modulation strategies for MMC are Nearest Level Modulation (NLM) and Carrier Phase-Shift Pulse Width Modulation (CPS-PWM). A comparison analysis on EMI sources' performance under NLM and CPS-PWM strategies are conducted by geometric deduction. Analysis and simulation results reveal that NLM has a better EMI performance in PWM frequency range than CPS-PWM.

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