Design and Modeling of Multilevel Converter for Drivetrains and Stationary Applications

Student thesis: Master's Thesis

Abstract

The depletion of fossil resources and the trend towards massive decarbonization lead to a growth of electrification around the world. As a result, electrification is intended to grow exponentially in the coming years and power electronic converters will play a key role over a wide range of applications. They are expected to be more reliable, modular, easy-to-maintain and cost efficient. This thesis consists on modeling, analysing and manufacturing a Multilevel Converter (MLC) which, at first sight, meets these requirements. The basic principle of the Multilevel Converter is to build a sinewave thanks to several DC sources. The switching stress as well as the harmonic distortion are therefore lower in comparison with traditional inverter using one bulky DC source. The objective of the thesis is therefore to develop, design and build our own MLC by using Silicon Carbide (SiC) based semiconductors. This MLC will be then analysed/compared with respect to other technique over two applications : automotive and stationary applications. Finally, the limitations, the influencing factors as well as the development paths will be discussed for any eventual future work.
Date of Award29 Jun 2019
Original languageEnglish

Keywords

  • Multilevel converter
  • Module balancing
  • THD
  • Control system
  • Power electronics

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