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João Pessoa, Brazil

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. Source

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