Steady-State Analysis of Interaction Between Harmonic Components of Arm and Line Quantities of Modular Multilevel Converters
2012 (English)In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 27, no 1, 57-68 p.Article in journal (Refereed) Published
The fundamental frequency component in the arm currents of a modular multilevel converter is a necessity for the operation of the converter, as is the connection and bypassing of the submodules. Inevitably, this will cause alternating components in the capacitor voltages. This paper investigates how the arm currents and capacitor voltages interact when the submodules are connected and bypassed in a sinusoidal manner. Equations that describe the circulating current that is caused by the variations in the total inserted voltage are derived. Resonant frequencies are identified and the resonant behaviour is verified by experimental results. It is also found that the effective values of the arm resistance and submodule capacitances can be extracted from the measurements by least square fitting of the analytical expressions to the measured values. Finally, the analytical expression for the arm currents is verified by experimental results.
Place, publisher, year, edition, pages
IEEE, 2012. Vol. 27, no 1, 57-68 p.
Analytical steady-state model, arm currents, experimental results, modular multilevel converter, phase-leg resonance
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-55863DOI: 10.1109/TPEL.2011.2159809ISI: 000298048500004ScopusID: 2-s2.0-83755187987OAI: oai:DiVA.org:kth-55863DiVA: diva2:471955
QC 201506262012-01-032012-01-032015-06-26Bibliographically approved