Open-end unidirectional topologies with reduced controlled switch count

In this work, two three-phase unidirectional open-end AC-DC configurations with reduced switch count were investigated. Both topologies have two DC-links and arise from the replacement of controlled switches by diodes, in order to reduce system complexity and costs. The first topology is composed by two converters: a three-level NPC (Neutral-Point Clamped) and a three-phase diode rectifier. The second configuration consists in two three-phase three-level NPC converters with some switches replaced by diodes. The comparison between proposed and conventional topologies in terms of harmonic distortion and power losses is presented. The control strategy of the systems as well as a detailed model, simulation and experimental results are presented.

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