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

2015; Institute of Electrical and Electronics Engineers; Volume: 51; Issue: 4 Linguagem: Inglês

10.1109/tia.2014.2387473

1939-9367

Isaac Soares de Freitas, Marcos Moura Bandeira, Luciano Barros, Cursino B. Jacobina, E. C. dos Santos, Fabiano Salvadori, Simplício Arnaud da Silva,

Silicon Carbide Semiconductor Technologies

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.