Active redundant submodule configuration in modular multilevel converters

Georgios Konstantinou; Josep Pou; Salvador Ceballos; Vassilios G. Agelidis

doi:10.1109/TPWRD.2013.2264950

Active redundant submodule configuration in modular multilevel converters

Georgios Konstantinou, Josep Pou, Salvador Ceballos, Vassilios G. Agelidis

Power Electronics and System Equipment

Research output: Contribution to journal › Article › peer-review

159 Citations (Scopus)

Abstract

The modular multilevel converter (MMC) is based on the cascaded connection of identical submodules (SMs) enabling additional redundancies. This paper proposes the configuration of the MMC topology with redundant SMs and demonstrates the effects of active redundancies. The proposed configuration decreases the switching frequency per SM while reducing the SM capacitor voltage ripples. An analytical model for determining the SM capacitor voltage ripple and voltage dynamics is derived. The results from the analytical model are compared with the switching model for a 21-level MMC with five redundant (25 in total) SMs per arm. Experimental results based on a single-phase laboratory prototype with five SMs per arm and a single redundant cell further illustrate the operation and verify the derived mathematical model and simulation results.

Original language	English
Article number	6578591
Pages (from-to)	2333-2341
Number of pages	9
Journal	IEEE Transactions on Power Delivery
Volume	28
Issue number	4
DOIs	https://doi.org/10.1109/TPWRD.2013.2264950
Publication status	Published - 2013

Keywords

Active redundancy
modular multilevel converter (MMC)
redundant configuration
redundant submodules
voltage balancing

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10.1109/TPWRD.2013.2264950

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Active redundant submodule configuration in modular multilevel converters

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