A Novel SVPWM Strategy and Its Implementation Considering Neutral-point Potential Balancing for Three-level NPC Inverter

This paper proposes a novel SVPWM strategy for the three-level neutral-point-clamped voltage source inverter,based on the particular disposition of all the redundant voltage vectors.The new modulation approach shows superior performance for the harmonic voltage and the control of neutral-point potential compared to the popular eight-stage centered SVPWM and realizes the balancing control of inverter neutral-point potential by modifying redundant small vectors pairs' distribution factor accurately,only requiring the information of dc-link capacitor voltages and three-phase load currents,which is convenient to apply and is compatible of digital computer realization.The feasibility of the proposed control approach has been verified via simulation and experiment results.