Title :
A carrier-based PWM scheme for neutral-point voltage balancing in three-level inverters
Author :
Tallam, Rangarajan M. ; Naik, Rajendra ; Nondahl, Thomas A.
Author_Institution :
Adv. Technol., Rockwell Autom., Milwaukee, WI, USA
Abstract :
A significant problem with neutral-point-clamped three-level inverters is the fluctuation in the neutral point voltage. In this paper, a capacitor voltage balancing technique for carrier-based three-level PWM is developed, with improved voltage control capability at high modulation index. The method incorporates a novel scheme that requires measurements of only the motor currents and capacitor voltages to implement voltage balancing control, and does not need to determine the direction of power flow between the motor and the inverter.
Keywords :
PWM invertors; electric current measurement; electric motors; load flow; power capacitors; voltage control; voltage measurement; PWM scheme; capacitor voltage balancing technique; capacitor voltage measurements; modulation index; motor current measurements; neutral-point voltage balancing; power flow; three-level inverters; voltage control; Capacitors; Current measurement; Fluctuations; Fluid flow measurement; Load flow; Power measurement; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE
Print_ISBN :
0-7803-8269-2
DOI :
10.1109/APEC.2004.1296090
