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 :
Rockwell Autom., Mequon, 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 pulsewidth modulation (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 inverter and the motor.
Keywords :
PWM invertors; voltage control; capacitor voltage balancing technique; capacitor voltage measurement; carrier-based PWM scheme; modulation index; motor current measurement; neutral-point voltage balancing; neutral-point-clamped three-level inverters; pulsewidth modulation; 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; Carrier-based pulsewidth modulation (PWM); neutral-point voltage balancing; space-vector PWM; three-level inverter;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2005.858283
