T24.4 - Analytical Modelling and Optimization of DC-Link Voltage Harmonic Spectra of Full-Bridge Modular Multilevel Converters for Buck and Boost Operation

Wednesday, March 22, 2023

2:30 PM – 2:50 PM ET

Location: W108

Authors: Thabet Alzahrani, Milijana Odavic, Sumeet Thakur, Kais Atallah

Technical Lecture Presenter(s)

Thabet Alzahrani

University of Sheffield, United Kingdom

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This paper develops a new analytical solution to the harmonic spectrum of the Full-Bridge Modular Multilevel Converter (FBMMC) dc-side voltage based on phase-shifted carrier pulse width modulation and considering varying dc-link voltage operation. The harmonic distribution of the FBMMC dc-side voltage is analyzed through using double Fourier series analysis. Through the analysis, proper selection of the modulation indexes, carrier phase shift angle, and the number of SMs can ensure a significant reduction in the dc-link switching-ripple voltage. Thus, the related filter can be removed or significantly reduced. The developed model is validated through simulation and experimental tests.