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A Multi-modular system based on parallel-connected multilevel flying capacitor converters controlled with fundamental frequency SPWM
Conference paper   Open access

A Multi-modular system based on parallel-connected multilevel flying capacitor converters controlled with fundamental frequency SPWM

C. Feng, J. Liang, V.G. Agelidis and T.C. Green
IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics, pp.2360-2365
Industrial Electronics Conference (IECON) 2006 (Paris, France, 06/11/2006–10/11/2006)
2006
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Abstract

The operation performance of a multi-modular system based on parallel-connected multilevel flying capacitor (FC) converters controlled with the fundamental frequency sinusoidal pulse-width modulation (FF-SPWM) method is analyzed in this paper. A controller is designed to mitigate the circulating current among converter modules when a phase-shifting SPWM method is utilised in order to reduce the output voltage harmonics. The proposed system exhibits lower power losses when compared with the higher frequency SPWM-controlled single-module multilevel FC converter or higher frequency SPWM-controlled two-level conventional converter. Simulations with two five-level FC converter modules are carried out to verify the proposed multi-modular system and its performance under the proposed modified control scheme. The results confirm the attractiveness of the proposed system.

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