Soft-Switching Solid State Transformer (S4T) - 2017


This paper presents a brand new topology for a totally bidirectional soft-switching solid-state transformer (S4T). The minimal topology, featuring 12 main devices and a high-frequency transformer, does not use an intermediate dc voltage link, and provides sinusoidal input and output voltages. The S4T can be configured to interface with 2- or multiterminal dc, single- or multiphase ac systems. An auxiliary resonant circuit creates zero-voltage-switching conditions for main devices from no-load to full-load, and helps manage interactions with circuit parasitic parts. The modularized structure permits series and/or parallel stacking of converter cells for high-voltage and high-power applications.

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