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 controling 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 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 4th conduction mode Is presented, eliminating the low frequency harmonics in the neutral-point current, consequently reducing the de-link capacitors sizes, and cost. Analytical models, computer simulation results, and experimental verification are presented.
AB - This paper presents a new switching strategy controling 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 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 4th conduction mode Is presented, eliminating the low frequency harmonics in the neutral-point current, consequently reducing the de-link capacitors sizes, and cost. Analytical models, computer simulation results, and experimental verification are presented.
KW - 150° conduction-mode
KW - Neutral point clamped (NPC)
KW - Three-level converter
KW - Total harmonic distortion
KW - Voltage source inverters
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M3 - Conference contribution
AN - SCOPUS:77649297500
SN - 9781424451111
T3 - Proceedings of the 11th International Middle East Power Systems Conference, MEPCON'2006
SP - 75
EP - 80
BT - Proceedings of the 11th International Middle East Power Systems Conference, MEPCON'2006
T2 - 11th International Middle East Power Systems Conference, MEPCON'2006
Y2 - 19 December 2006 through 21 December 2006
ER -