TY - JOUR
T1 - New switching strategy controlling a new three-level voltage source inverter
AU - Saied, M. H.
AU - Mostafa, M. Z.
AU - Abdel-Moneim, T. M.
AU - Yousef, H. A.
PY - 2007/5
Y1 - 2007/5
N2 - This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed states becomes 64 compared to 27 originally proposed by other modulation strategies. For a wye-connected load operating at low modulation index (M<0.5 p.u.), the output phase-voltage becomes a seven-level, 12-step waveform, instead of the 6-step one. Thus, the total harmonic distortion is highly reduced. Three new conduction-modes are presented, each verifies a reduced common-mode-voltage time-variation [dv/dt), low third harmonic content, and reduced switching frequency harmonics. For higher modulation indexes, a 4 th conduction mode is presented, eliminating the low frequency harmonics in the neutral-point current, consequently reducing the dc-link capacitors sizes, and cost. Analytical models, computer simulation results, and experimental verification are presented.
AB - This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed states becomes 64 compared to 27 originally proposed by other modulation strategies. For a wye-connected load operating at low modulation index (M<0.5 p.u.), the output phase-voltage becomes a seven-level, 12-step waveform, instead of the 6-step one. Thus, the total harmonic distortion is highly reduced. Three new conduction-modes are presented, each verifies a reduced common-mode-voltage time-variation [dv/dt), low third harmonic content, and reduced switching frequency harmonics. For higher modulation indexes, a 4 th conduction mode is presented, eliminating the low frequency harmonics in the neutral-point current, consequently reducing the dc-link capacitors sizes, and cost. Analytical models, computer simulation results, and experimental verification are presented.
KW - 150° conduction-mode
KW - Neutral point clamped
KW - Three-level converter
KW - Total harmonic distortion
KW - Voltage source inverters
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M3 - Article
AN - SCOPUS:34848870199
SN - 1110-0168
VL - 46
SP - 297
EP - 308
JO - AEJ - Alexandria Engineering Journal
JF - AEJ - Alexandria Engineering Journal
IS - 3
ER -