TY - GEN
T1 - New three-level voltage source inverter with different 25 space voltage vectors
AU - Saied, Mohamed H.
AU - Mostafa, M. Z.
AU - Abdel-Moneim, T. M.
AU - Yousef, H. A.
PY - 2006
Y1 - 2006
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 (OLSS) intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed switching 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 forth 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 (OLSS) intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed switching 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 forth 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 - NPC
KW - Neutral point clamped
KW - Three-level converter
KW - Total harmonic distortion
KW - Voltage source inverters
UR - http://www.scopus.com/inward/record.url?scp=50249175533&partnerID=8YFLogxK
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U2 - 10.1109/PESA.2006.343079
DO - 10.1109/PESA.2006.343079
M3 - Conference contribution
AN - SCOPUS:50249175533
SN - 9623675445
SN - 9789623675444
T3 - 2006 2nd International Conference on Power Electronics Systems and Applications, ICPESA
SP - 102
EP - 107
BT - 2006 2nd International Conference on Power Electronics Systems and Applications, ICPESA
T2 - 2006 2nd International Conference on Power Electronics Systems and Applications, ICPESA
Y2 - 12 November 2006 through 14 November 2006
ER -