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

UR - http://www.scopus.com/inward/record.url?scp=77649297500&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77649297500&partnerID=8YFLogxK

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 -