Title :
Natural Balancing of the 2-Cell Modular Multilevel Converter
Author :
van der Merwe, Wim
Author_Institution :
ABB Corp. Res., Baden-Dattwil, Switzerland
Abstract :
Natural balancing of the cell voltages is observed in many multilevel converters, however, this was not previously described for the modular multilevel converter (MMC). This paper introduces a method whereby the self-balancing behavior of the MMC can be described and analyzed. A novel equivalent circuit of the two cell single phase MMC is introduced whereby the unbalance in the system is clearly stated. Using this equivalent circuit a method, using the frequency domain as basis for analysis, is proposed whereby the self-balancing properties of the converter can be described. The method is verified through comparison with simulation results.
Keywords :
PWM power convertors; equivalent circuits; frequency-domain analysis; 2-cell modular multilevel converter; equivalent circuit; frequency domain analysis; natural balancing; self-balancing behavior; self-balancing property; Capacitors; Equivalent circuits; Fourier series; Frequency-domain analysis; Harmonic analysis; Switches; Switching frequency; Frequency domain; modular multilevel converters (MMCs); natural balancing; pulse width modulation (PWM);
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2014.2322142
