The modular multilevel converter (MMC) is one
of the most promising converter topologies for high-voltage
applications, especially for high-voltage direct-current (HVDC)
transmission systems. One of the most challenging issues associated
with the MMC is the capacitor voltage variations,
which if not properly controlled, result in large circulating
currents flowing through the converter legs. This paper develops a
mathematical model to formulate and analyze capacitor voltage
variations and the circulating currents within the MMC legs.
Based on the developed model, the limits to the capacitor voltage
balancing task are derived and graphically presented. A set of
simulation results conducted in MATLAB/Simulink environment
are presented to verify the accuracy of the mathematical analysis.
CitationCeballos, S. [et al.]. Analysis of voltage balancing limits in modular multilevel converters. A: Annual Conference of the IEEE Industrial Electronics Society. "IECON 2011 - IEEE Industrial Electronics Conference". Melbourne: IEEE, 2011, p. 4397-4402.
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