Open AccessSiC‐based active quasi‐Z‐source inverter with improved PWM control strategy
Author(s) -
Duong TruongDuy,
Nguyen MinhKhai,
Lim YoungCheol,
Choi JoonHo,
Vilathgamuwa D. Mahinda
Publication year - 2019
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.2019.0323
Subject(s) - modulation index , duty cycle , inverter , pulse width modulation , z source inverter , inductor , control theory (sociology) , flowchart , modulation (music) , computer science , voltage , electronic engineering , engineering , control (management) , physics , electrical engineering , artificial intelligence , acoustics , programming language
In this study, an improved pulse width modulation (PWM) scheme was proposed for an active quasi‐Z source inverter (AqZSI). Compared to the quasi‐Z‐source inverter (qZSI), the AqZSI with improved PWM strategy can operate in a wide range of input voltage with higher efficiency. Furthermore, the AqZSI can operate with a higher modulation index, a lower inductor current stress, and a reduced shoot‐through current. A procedure flowchart is presented for the optimal selection of the shoot‐through duty cycle, the switching ratio of the additional switch, and the modulation index for AqZSI. Moreover, some comparative results between the AqZSI, qZSI and conventional two‐stage inverter with a boost DC–DC converter are shown in detail. Finally, 1.2 kVA SiC‐based three‐phase inverter prototypes are built to verify the agreement between theory and measurement.