Title :
Natural balancing of the 2-cell modular multilevel converter
Author :
van der Merwe, Wim
Author_Institution :
ABB Corp. Res., Baden-Dättwil, Switzerland
Abstract :
Natural balancing of the cell voltages is observed in many multilevel converters, however, this was not previously described for the MMC. This paper introduces a method whereby the self-balancing behaviour of the MMC can be described and analysed. 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 :
equivalent circuits; frequency-domain analysis; power convertors; 2-cell modular multilevel converter; cell voltages; equivalent circuit; frequency domain analysis; natural balancing; self-balancing; single phase MMC; Capacitors; Eigenvalues and eigenfunctions; Equivalent circuits; Fourier series; Harmonic analysis; Switches; Switching frequency;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2013 IEEE
Conference_Location :
Denver, CO
DOI :
10.1109/ECCE.2013.6647239
