Investigation of a Circuit Model and a Control Strategy for the Generalized Cascaded Full-Bridge Converter

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 69; no. 3; pp. 1337 - 1341
• Main Authors: Queiroz, Samuel S., Oliveira, Demercil de S., Praca, Paulo P., Barreto, Luiz Henrique S. C.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-03-2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit modeling; Circuits; Circuits and systems; Current sharing; Electric converters; Equivalent circuits; Integrated circuit modeling; Load balancing; Mathematical model; Modulation; multilevel systems; parallel interleaved converters; power balance; Static synchronous compensators; Topology; Voltage control
• ISSN: 1549-7747; 1558-3791
• DOI: 10.1109/TCSII.2021.3103795

This brief addresses an overall circuit model to represent a novel generalized cascaded full-bridge (GCF) converter. The synthesis methodology of the GCF converter uses full-bridge sub-modules (SMs) combined with the interleaving and cascading concepts. The time-dependent equations represented in terms of current and voltage magnitudes are obtained. Thus, it is possible to derive a comprehensive control system approach from the model. An improved control strategy provides power balancing while using the circulating current to balance the dc-link voltages and ensuring proper current sharing. A small-scale laboratory prototype of a static synchronous compensator (STATCOM) rated at 2.2 kVA/311 V validates the theoretical assumptions and statements.