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A novel modulation for the comprehensive neutral-point balancing in the three-level NPC inverter with minimum output switching-frequency ripple

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4 Author(s)
Busquets-Monge, S. ; Dept. of Electron. Eng., Technical Univ. of Catalonia, Barcelona, Spain ; Somavilla, S. ; Bordonau, J. ; Boroyevich, D.

This paper presents a new modulation approach for the complete control of the neutral-point voltage in the three-level three-phase neutral-point-clamped voltage source inverter. The balancing of the neutral-point is achieved over the full range of converter output voltages and for all load power factors with the minimum output voltage distortion at around the switching-frequency. The simple phase duty-ratio expressions in d-q-0 coordinates that define this modulation solution are presented. The performance of this modulation approach and its benefits over other previously proposed solutions are verified through simulation and experimentation.

Published in:

Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual  (Volume:6 )

Date of Conference:

20-25 June 2004

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