Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 8, Pages 6773-6783Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3000121
Keywords
Harmonic analysis; multilevel converters; pulsewidth modulation
Categories
Funding
- Spanish Science and Innovation Ministry [TEC2016-78430-R]
- Consejeria de Economia, Conocimiento, Empresas y Universidad
- Secretaria General de Universidades, Investigacion y Tecnologia [PY18-1340]
- Advanced Center for Electric and Electronic Engineering, Chile [ANID/FB0008]
- Solar Energy Research Center, Chile [ANID/FONDAP/15110019]
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The article presents a variable-angle phase-shifted pulsewidth modulation (PS-PWM) technique for CHB converters, achieving superior harmonic performance under unbalanced conditions.
Modular converters such as the multilevel cascaded H-bridge (CHB) are an attractive option for multiple applications mainly because of inherent modularity and fault-tolerant operation. This article is focused on the CHB converter operating with unbalanced conditions (different dc voltages and/or modulation indexes). Under these circumstances, applying the conventional control and modulation strategies, the output voltage harmonic spectrum is degraded. In this article, a generalized variable-angle phase-shifted pulsewidth modulation (PS-PWM) technique for CHB converters with a large number of power modules (>3) is presented. The method considers all possible cells' combinations to form groups and assigns the role of each cell in the group. This cell role defines the identifier of the cell in the variable-angle PS-PWM technique. In the steady state, in each group of cells, the harmonic distortion of the CHB output voltage located at twice the carrier frequency f(c) is eliminated, while the distortion at 4f(c) is also diminished. Experimental results show how the proposed technique achieves superior harmonic performance without introducing any significant disadvantage.
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