Alternative topology for three-phase four-wire PWM converters applied to a shunt active power filter
Location: Spain
Publication date: 2011-11-08
Published in: Annual Conference of the IEEE Industrial Electronics Society 2002, Sevilla (Spain) - IECON 2002
ref. DOI: 10.1109/IECON.2002.1182863

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Pindado, R. , Bergas, J.



This paper presents an alternative three-phase four-wire converter for active power filterapplications. The topology of this converter consists of four switch-legs, and it uses a "split-capacitor" in the DC-bus. In this converterthree legs are destined to control the injected currents in utility lines, while the fourth leg assures a balanced voltage sharing in the DC-bus capacitors. This converter solves the problem of DC-bus voltage imbalance in the three-leg split-capacitor converter. Moreover, this topology allows each leg to be controlled independently, so injected current control is simpler than in the four-leg full-bridge conventional converter, which utilizes a single capacitor on the DC-bus side. In this sense, a simple constant-frequency current control technique is proposed. In this paper, an analytical study and a verification by simulation are conducted.


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