Journal
IET POWER ELECTRONICS
Volume 9, Issue 13, Pages 2471-2481Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2015.0447
Keywords
switching convertors; modulation; three phase differential multilevel converter; fundamental frequency switching strategy; optimised variable offset modulation technique; buck converter; switching loss reduction; reduced structure 16-level converter
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In recent years, various modulation techniques have been introduced for different topologies of multilevel converters; every technique has its own advantages as well as disadvantages in practice. This study presents a new optimised variable offset modulation technique for differential multilevel converters that is based on using the concept of optimised offset in a simple buck converter. This modulation technique with achievement to full DC utilisation reduces switching losses. The resultant switching pulses reduce the switching power losses for multilevel converters compared with the conventional techniques. To evaluate the suggested method, the optimised offset has been compared with three conventional modulation techniques. All four modulation techniques are implemented on a reduced structure 16-level converter with fundamental frequency switching strategy. Comparative analysis for the experiments confirms the capability of the presented technique in efficiency enhancement as well as high quality of the output voltage and loss reduction.
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