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The nearest three virtual space vector PWM - a modulation for the comprehensive neutral-point balancing in the three-level NPC inverter

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

This letter 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 new modulation approach, based on the virtual space vector concept, guarantees the balancing of the neutral-point voltage for any load (linear or nonlinear) over the full range of converter output voltage and for all load power factors, the only requirement being that the addition of the output three-phase currents equals zero. The implementation of the proposed modulation is simple according to the phase duty-ratio expressions presented. These expressions are only dependent on the modulation index and reference vector angle. The performance of this modulation approach and its benefits over other previously proposed solutions are verified experimentally.

Published in:

Power Electronics Letters, IEEE  (Volume:2 ,  Issue: 1 )

Date of Publication:

March 2004

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