Analysis and Operation of Modular Multilevel Converters With Phase-Shifted Carrier PWM
2015 (English)In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 30, no 1, 268-283 p.Article in journal (Refereed) Published
Many publications have been presented on the modulation and control of the modular multilevel converter, some of which are based on phase-shifted carrier modulation. This paper presents an analysis of how the switching frequency affects the capacitor voltages, circulating currents, and alternating voltages using phase-shifted carrier modulation. It is found that switching frequencies that are integer multiples of the fundamental frequency should be avoided as they can cause the capacitor voltages to diverge. Suitable switching frequencies are derived for which the arm and line quantities will be periodic with symmetric operating conditions in the upper and lower arms. Thus, the practical outcome of this paper is a detailed description of how the switching frequency should be chosen in order to achieve advantageous operating conditions. The theoretical results from the analysis are validated by both simulations and experimental results.
Place, publisher, year, edition, pages
2015. Vol. 30, no 1, 268-283 p.
Capacitor voltages, circulating current, modular multilevel converter (M2C), phase-shifted PWM, switching harmonics
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-153755DOI: 10.1109/TPEL.2014.2321049ISI: 000341624200023ScopusID: 2-s2.0-84906810276OAI: oai:DiVA.org:kth-153755DiVA: diva2:753564
QC 201506222014-10-082014-10-082015-06-23Bibliographically approved