No abstract

No abstract

In this paper is presented a pulse-width-modulation (PWM) technique with neutral point capacitor voltage balancing in single-phase neutral-point-clamped (NPC) converters. 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. It is presented a set of equations 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 capacitors voltages balancing.

No abstract

No abstract