A Carrier-Based PWM Technique for Capacitor Voltage Balancing of Single-Phase Three-Level Neutral-Point-Clamped Converters

作者：de Freitas Isaac Soares^*; Bandeira Marcos Moura; Barros Luciano de Macedo; Jacobina Cursino Brandao; dos Santos Euzeli Cipriano; Salvadori Fabiano; da Silva Simplicio Arnaud

来源：IEEE Transactions on Industry Applications, 2015, 51(4): 3227-3235.

DOI：10.1109/TIA.2014.2387473

• Carrier-based pulsewidth modulation
• neutral-point-clamped converter
• neutral-point voltage deviation
• three-level converter

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.

• 出版日期2015-8