Modulation and control of three-phase PWM multilevel converters

Josep Pou i Fèlix. Modulation and control of three-phase PWM multilevel convertersDissertation submitted to the UPC for the degree of Doctor of Philosophy in Industrial Engineering.
Departament D’enginyeria electronica, Universitat politecnica De Catalunya, 2002 - 200 p.Abstract: Three-phase diode-clamped converter multilevel topologies are studied in this dissertation. These static converters can generate three or more voltage levels in each output phase, and are generally applied to high-power applications because of their ability to operate with larger voltages than the classical two-level converters. The analysis is mainly focused on the three-level topology, although there are some contributions for converters with a larger numbers of levels. The main objectives are to propose new computationaly effecient space-vector PWM modulation algorithms, to analyze the imbalances in the DC link capacitors and the compensation for their effects, and to study advanced control loops. The results are obtained from different models in order to guarantee conclusion reliability. Furthermore, most of the results have been checked experimentally.Introduction
Multilevel topologies. Prototype description and modeling
Space-vector PWM
Space-vector modulation in high-order multilevel topologies
Feedforward space-vector PWM
Imbalances and additional modulation issues
Multivariable optimal control
Conclusion and future research
Appendix