Open AccessNew concept on sinusoidal modulation for three‐phase DC/AC converters: analysis and experiments
Author(s) -
Eskandari Bahman,
Tavakoli Bina Mohammad,
Golkar Masoud Aliakbar
Publication year - 2014
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2012.0707
Subject(s) - converters , modulation (music) , modulation index , pulse width modulation , space vector modulation , control theory (sociology) , computer science , three phase , buck converter , pulse frequency modulation , electronic engineering , mathematics , pulse (music) , voltage , pulse amplitude modulation , physics , engineering , artificial intelligence , telecommunications , electrical engineering , control (management) , detector , acoustics
Various modulation schemes have already been developed for conventional three‐phase buck‐type converters such as sinusoidal pulse‐width modulation and space vector modulation (SVM). However, SVM is not applicable to boost‐type converters. This study proposes a new concept on sinusoidal modulation for both buck and boost‐type three‐phase DC–AC converters. A novel optimised modulation technique is introduced by using basic equations of conventional buck and boost. By solving the optimisation problem, pulse widths will be obtained for a given modulation index. The significant point is that the optimisation problem should not be solved for every modulation index because the answer of the optimisation problem obeys a certain pattern. Also, this method has a positive effect on reducing losses, especially in boost‐converters. Analysis and simulations are first introduced for three‐phase boost‐converters, and then is extended to a buck converter. Furthermore, practical verification takes place on two implemented 1 kVA boost and buck‐converters in order to confirm the proposed technique as well as theoretical analysis and simulations. The experiments and simulations both verify the suggested optimised modulation technique.