Circulating current control in modular multilevel converters with fundamental switching frequency
2012 (English)In: Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012, IEEE , 2012, 249-256 p.Conference paper (Refereed)
The modular multilevel converter is a suitable topology for high-voltage applications as it combines very low switching frequency and excellent harmonic performance. In fact, it has been shown that the modular multilevel converter can even be operated at the fundamental switching frequency. If the circulating current is not controlled, a second-order harmonic component will appear. This component increases the resistive losses and the capacitor voltage ripple. Different control methods have been developed for eliminating this component in the circulating current. These are, however, based on continuous representations of the system and no control method suitable for fundamental switching frequency have yet been proposed. This paper presents a control method that combines a fundamental switching frequency scheme with an active control of the circulating current. The controller is verified experimentally on a 10-kVA laboratory prototype with five submodules per arm. The experimental validation is performed in both inverter and rectifier modes.
Place, publisher, year, edition, pages
IEEE , 2012. 249-256 p.
Electric converters, Motion control, Power electronics
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-100853DOI: 10.1109/IPEMC.2012.6258844ScopusID: 2-s2.0-84866782674ISBN: 978-145772086-4OAI: oai:DiVA.org:kth-100853DiVA: diva2:545454
2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012; Harbin; 2 June 2012 through 5 June 2012
QC 201211212012-08-202012-08-202016-04-21Bibliographically approved