Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: The multicell inverter, being a widely used multilevel converter, has received much
attention in recent years due to problems associated with cell capacitor voltage. In this
dissertation we study the balancing problem with a focus on steady-state unbalance. This
is achieved by systematic and mathematically rigorous study of the natural balancing
mechanisms of the three-phase 2-cell and 3-cell multicell converter, undertaken by using
dynamic modelling of the multicell converter, Bennet’s geometric model, steady-state and
time constant analysis. Space vector analysis is also performed for the three-phase 2-cell
multicell converter. The theory is verified by comparing theoretical results with simulation
results / AFRIKAANSE OPSOMMING: Die multisel omkeerder as algemeen-gebruikte meervlakkige omsetter het die
afgelope jare groot belangstelling gewek op grond van die probleme wat met selkapasitor
stroomspanning geassosieer word. In hierdie proefskrif word die balanseringsprobleem met
die klem op die ewewigswanbalans bestudeer. Dit is verrig deur ’n sistematiese en streng
wiskundige studie van die natuurlike balanseringsmeganismes van die drie-fase 2-sel en 3-
sel multisel omsetter te maak. Dit is gedoen deur die gebruik van dinamiese modellering
van die multisel omsetter, Bennet se geometriese model, ewewigtoestand tydkonstante
analises, en ruimtevektoranalise is vir die drie-fase 2-sel multisel omsetter gedoen. Die
teorie word bevestig deur die teoretiese resultate met die simuleringsresultate te vergelyk
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/3981 |
| Date | 03 1900 |
| Creators | Salagae, Isaac Mahijoko |
| Contributors | Mouton, H. du T., Wilkinson, R. H., University of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 416 p. : ill. |
| Rights | University of Stellenbosch |
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