Modular multilevel converter AC motor drives with constant torque from zero to nominal speed
2014 (English)In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 50, no 3, 1982-1993 p.Article in journal (Refereed) Published
Modular multilevel converters are shown to have a great potential in the area of medium-voltage drives. Low-distortion output quantities combined with low average switching frequencies for the semiconductor devices create an ideal combination for very high-efficiency drives. However, the large number of devices and capacitors that have to conduct the fundamental-frequency current require more complex converter control techniques than its two-level counterpart. Special care needs to be taken for starting and operation at low speeds, where the low-frequency current may cause significant unbalance between the submodule capacitor voltages and disturb the output waveforms. In this paper, principles for converter operation with high torque in the whole speed range are investigated. Experimental results from a down-scaled 12-kVA prototype converter running a loaded motor at various speeds between standstill and the rated speed are also provided.
Place, publisher, year, edition, pages
2014. Vol. 50, no 3, 1982-1993 p.
constant torque, medium-power variable-speed drives, Modular multilevel converters
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-134880DOI: 10.1109/TIA.2013.2286217ISI: 000338984300040ScopusID: 2-s2.0-84901298816OAI: oai:DiVA.org:kth-134880DiVA: diva2:668815
QC 201406132013-12-022013-12-012014-12-01Bibliographically approved