Semi-full-bridge submodule for modular multilevel converters
2015 (English)In: Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015 9th International Conference on, IEEE conference proceedings, 2015, 1067-1074 p.Conference paper (Refereed)Text
The energy variations in each arm of the modular multilevel converter comprises two components. The first component relates to the difference between the instantaneous input and output power of each phase-leg, and the second component relates to the energy which is moved back and forth between the two arms of the phase-leg. The latter component can be reduced or even eliminated if the peak-to-peak amplitude of the alternating voltage is greater than the pole-to-pole voltage of the dc link. This will, however, require submodules which can insert negative voltages. Therefore, a semi-full-bridge submodule which uses less semiconductors than the conventional full-bridge is proposed. Simulation results shows that by using the negative voltage-levels the capacitor voltage ripple can be reduced by up to 59%. Experimental results also shows that a 7-level voltage waveform can be generated using only one semi-full-bridge submodule with two capacitors per arm.
Place, publisher, year, edition, pages
IEEE conference proceedings, 2015. 1067-1074 p.
power convertors;7-level voltage waveform;capacitor voltage ripple;modular multilevel converters;negative voltage-levels;peak-to-peak amplitude;pole-to-pole voltage;semifull-bridge submodule;Capacitance;Capacitors;Converters;Energy storage;Modulation;Semiconductor diodes;Switches;energy ripple;full-bridge submodules;modular multilevel converter;modulation index
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-182750DOI: 10.1109/ICPE.2015.7167913ScopusID: 2-s2.0-84961933336OAI: oai:DiVA.org:kth-182750DiVA: diva2:905660
Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015 9th International Conference on
QC 201602262016-02-232016-02-232016-02-26Bibliographically approved