Abstract
In order to solve the problem of voltage fluctuation of sub-module capacitors in Modular Multilevel Converter, based on carrier phase-shifted sinusoidal pulse width modulations, this paper analyzes the effect of different carrier phase shift modulation and the number of sub-modules on a single bridge arm on the number of output levels and uses proportional control to make capacitor voltage balance and PI control to suppress bridge arm circulation. The method has a good stability effect on the sub-module capacitor voltage.A 31-level model is built in MATLAB/simulink to analyze the capacitor voltage fluctuation, output current and voltage distortion rate, and bridge arm current of the sub-module. The voltage and circulation fluctuation range is compared when there is no circulation suppression. It is verified that the method is simple and effective.
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