TY - JOUR
T1 - Identifying Circulating Currents and Zero-Sequence Voltages for Reduction in Stored Capacitor Energy in Modular Multilevel Converters
AU - Townsend, Christopher D.
AU - Goodwin, Graham Clifford
AU - Konstantinou, Georgios
AU - Petranovic, Nikola
AU - Mirzaeva, Galina
AU - Farivar, Ghias
AU - Pou, Josep
PY - 2021/1
Y1 - 2021/1
N2 - 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.
AB - 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.
KW - Modular multilevel converters (MMCs)
KW - optimization methods
UR - http://www.scopus.com/inward/record.url?scp=85086006620&partnerID=8YFLogxK
U2 - 10.1109/TIE.2020.2965504
DO - 10.1109/TIE.2020.2965504
M3 - Article
AN - SCOPUS:85086006620
VL - 68
SP - 454
EP - 465
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
SN - 0278-0046
IS - 1
M1 - 8962343
ER -