This article presents a unified modeling and control approach for three-phase $\boldsymbol{N}$ -level neutral-point-clamped (NPC) inverters. An averaged duty-cycle model enables regulation of the DC-bus capacitor voltages without altering the commanded output voltage. A necessary and sufficient modulation-feasibility condition is derived, and conservative and exact online limiters are introduced to constrain the internal current references through uniform scaling. The method is experimentally validated on a reconfigurable NPC E-type converter operated in three-, four-, and five-level configurations and supplying an induction machine. The results confirm accurate DC-bus voltage regulation under constant, nonuniform, and time-varying references, effective current limiting, and stable operation within the linear modulation region.
Boico, G., Vita, L., Mengoni, M., Rizzoli, G., Zarri, L., Tani, A., et al. (2026). Carrier-Based PWM Strategy for N-Level NPC Inverters With Full DC-Bus Capacitor Voltage Controllability. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 1, 1-13 [10.1109/TIE.2026.3738926].
Carrier-Based PWM Strategy for N-Level NPC Inverters With Full DC-Bus Capacitor Voltage Controllability
Boico G.;Mengoni M.;Rizzoli G.;Zarri L.;Tani A.;
2026
Abstract
This article presents a unified modeling and control approach for three-phase $\boldsymbol{N}$ -level neutral-point-clamped (NPC) inverters. An averaged duty-cycle model enables regulation of the DC-bus capacitor voltages without altering the commanded output voltage. A necessary and sufficient modulation-feasibility condition is derived, and conservative and exact online limiters are introduced to constrain the internal current references through uniform scaling. The method is experimentally validated on a reconfigurable NPC E-type converter operated in three-, four-, and five-level configurations and supplying an induction machine. The results confirm accurate DC-bus voltage regulation under constant, nonuniform, and time-varying references, effective current limiting, and stable operation within the linear modulation region.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
