TY - JOUR
T1 - EKθ multilevel inverter - a minimal switch novel configuration for higher number of output voltage levels
AU - Bhaskar, Mahajan Sagar
AU - Meraj, Mohammad
AU - Iqbal, Atif
AU - Ben-Brahim, Lazhar
AU - Padmanaban, Sanjeevikumar
AU - Abu-Rub, Haitham
N1 - Publisher Copyright:
© The Institution of Engineering and Technology 2020
PY - 2020/10/14
Y1 - 2020/10/14
N2 - In this study, a new multilevel inverter (MLI) configuration is proposed to generate higher number of levels with minimal control switches. The proposed inverter's nomenclature is EKθ MLI, termed from its stems of shape. Conventional single-phase H-bridge module is modified to design the structure of θ MLI called 'θ cell' (where, K = 0) by incorporating three symmetrical DC-sources and replacing one leg of H-bridge by bidirectional switches. The θ cell of the proposed EKθ MLI generates five-level AC waveform at the output by using only four controlled switches (two unidirectional and two bidirectional). Therefore, the size, cost and switching logic of the MLI is reduced. The basic structure of EKθ MLI called 'Eθ MLI' (where K = 1) is designed which is capable of generating seven-level. For further extension, double-switch-E cell (DS-E cell) is added in the middle and each DS-E cell increases the four levels by utilising two bidirectional switches and two DC supplies. The generalised MLI configuration is explained in niceties to generate a higher number of levels (more than 5). The modes of operation, voltage across the switches, power losses of EKθ are discussed. The proposed MLI is experimentally investigated using level shifting pulse width modulation.
AB - In this study, a new multilevel inverter (MLI) configuration is proposed to generate higher number of levels with minimal control switches. The proposed inverter's nomenclature is EKθ MLI, termed from its stems of shape. Conventional single-phase H-bridge module is modified to design the structure of θ MLI called 'θ cell' (where, K = 0) by incorporating three symmetrical DC-sources and replacing one leg of H-bridge by bidirectional switches. The θ cell of the proposed EKθ MLI generates five-level AC waveform at the output by using only four controlled switches (two unidirectional and two bidirectional). Therefore, the size, cost and switching logic of the MLI is reduced. The basic structure of EKθ MLI called 'Eθ MLI' (where K = 1) is designed which is capable of generating seven-level. For further extension, double-switch-E cell (DS-E cell) is added in the middle and each DS-E cell increases the four levels by utilising two bidirectional switches and two DC supplies. The generalised MLI configuration is explained in niceties to generate a higher number of levels (more than 5). The modes of operation, voltage across the switches, power losses of EKθ are discussed. The proposed MLI is experimentally investigated using level shifting pulse width modulation.
UR - http://www.scopus.com/inward/record.url?scp=85091267133&partnerID=8YFLogxK
U2 - 10.1049/iet-pel.2019.0945
DO - 10.1049/iet-pel.2019.0945
M3 - Article
AN - SCOPUS:85091267133
SN - 1755-4535
VL - 13
SP - 2804
EP - 2815
JO - IET Power Electronics
JF - IET Power Electronics
IS - 13
ER -