Identifying Circulating Currents and Zero-Sequence Voltages for Reduction in Stored Capacitor Energy in Modular Multilevel Converters

Christopher D. Townsend, Graham Clifford Goodwin, Georgios Konstantinou, Nikola Petranovic, Galina Mirzaeva, Ghias Farivar, Josep Pou

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

To reduce stored capacitor energy in modular multilevel converters (MMCs), previous papers propose injection of harmonics in the arm circulating currents and zero-sequence voltages. While this approach is effective, previously utilized combinations of injected harmonics significantly increase converter current ratings. In contrast, the optimization approach developed in this article identifies harmonics that simultaneously achieve capacitor energy optimization and reduced overrating of converter currents. In addition, the proposed approach eliminates the possibility of convergence to local minima, which is a significant improvement on previously proposed nonconvex optimization approaches. Experimental verification of the proposed approach is performed on a low-voltage three-phase modular multilevel converter.

Original languageEnglish
Article number8962343
Pages (from-to)454-465
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Volume68
Issue number1
DOIs
Publication statusPublished - Jan 2021

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