De Freitas I.S.,Federal University of Paraiba UFPB |
Bandeira M.M.,Federal University of Paraiba UFPB |
Barros L.D.M.,Federal University of Campina Grande |
Jacobina C.B.,Federal University of Paraiba UFPB |
And 3 more authors.
IEEE Transactions on Industry Applications | Year: 2015
In this paper, a pulsewidth-modulation (PWM) technique with neutral point capacitor voltage balancing in single-phase neutral-point-clamped converters is presented. The technique is based on the injection of a common-mode voltage signal into the sinusoidal modulating signals of the conventional carrier-based PWM. Although several strategies have been reported for such a problem by using the voltage signal injection, the proposed method is very simple with easy implementation. A set of equations is presented to demonstrate how the injected voltage signal introduces a dc component on the neutral-point current, which can be controlled in order to allow the capacitor voltages balancing. © 1972-2012 IEEE.