Open AccessImproved pulse‐width modulation scheme for T‐type multilevel inverter
Author(s) -
Vemuganti Hari Priya,
Sreenivasarao Dharmavarapu,
Siva Kumar Ganjikunta
Publication year - 2017
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.2016.0729
Subject(s) - total harmonic distortion , pulse width modulation , modulation (music) , network topology , electronic engineering , topology (electrical circuits) , converters , inverter , computer science , voltage , electrical engineering , engineering , physics , acoustics , operating system
In recent times, reduced switch count multilevel inverter (RSC‐MLI) has become an emerging area of research in power electronic converters. To control these RSC‐MLI topologies, various novel modulation schemes are reported. Multi‐reference is one of such modulation scheme reported for various RSC topologies, such as T‐type. However, the performance of this conventional scheme results in high total harmonic distortion (THD) in line voltages, when compared with the conventional level shifted pulse‐width modulation scheme. This observation is clearly presented in this study and the reason for its degraded THD performance has been deeply discussed. To alleviate this problem, a modified multi‐reference dual‐carrier modulation technique with multiple references and two carriers is proposed. To implement this proposed modulation technique, an alternate carrier and modulation signals arrangement with multiple carriers and single reference is also presented. Finally, a comparative THD performance of the proposed and conventional modulation schemes is carried out on a five‐level T‐type MLI and obtained simulation results are validated experimentally.