Flexible On-load Voltage Regulating Transformer by Floating Capacitor Three-level AC/AC Converter

The flexible on-load transformer can be adapted to different application scenarios by adding different power electronic converter structures through the use of existing transformers. In this paper, a flexible on-load regulator transformer structure based on a floating capacitor multi-level AC/AC converter is proposed, which can compensate the input voltage on the primary side of the transformer in the same direction or the opposite direction, combine with the existing on-load tap-changer, and also achieve fast stepless voltage regulation. Finally, the effectiveness of the proposed new topology is verified by simulation and experiment.