Generalized small-signal modelling of dual active bridge DC/DC converter.

Hebala, Osama M.; Aboushady, Ahmed A.; Ahmed, Khaled H.; Burgess, Sam; Prabhu, Radhakrishna

Abstract

This paper presents a novel generalised approach of the small-signal modelling of dual active bridge (DAB) DC/DC converter. The adopted analysis is based on a per-unit fundamental frequency representation of the DAB. The outcome of the proposed modelling approach is a small signal, linearised, state-space DAB model; which is considered as a main building block for future control applications. The developed small signal DAB model includes all possible degrees of freedom affecting the performance of the DAB; this includes the voltage conversion ratio to allow the study of all DAB operation modes (i.e. unity-gain and buck/boost modes). Furthermore, since triple phase shift control (TPS) is used in this development work, the proposed model incorporates phase shift in addition to duty ratios. This feature allows for bridge voltage regulation, which is essential for efficient DAB operation in the case of buck/boost operation. Another key achievement is that the proposed small signal modelling methodology can be applied to any bidirectional DC-DC converter regardless of ratings, parameter values and number of ports. Extensive simulation is carried out to verify the proposed analysis.

Citation

HEBALA, O.M., ABOUSHADY, A.A., AHMED, K.H., BURGESS, S. and PRABHU, R. 2018. Generalized small-signal modelling of dual active bridge DC/DC converter. In Proceedings of the 7th International conference on renewable energy research and applications (ICRERA 2018), 14-17 October 2018, Paris, France. Piscataway: IEEE [online], article ID 8567014, pages 914-919. Available from: https://doi.org/10.1109/ICRERA.2018.8567014

• Conference Name: 7th International conference on renewable energy research and applications (ICRERA 2018)
• Conference Location: Paris, France
• Start Date: Oct 14, 2018
• End Date: Oct 17, 2018
• Acceptance Date: Aug 15, 2018
• Online Publication Date: Dec 10, 2018
• Publication Date: Dec 10, 2018
• Deposit Date: Feb 11, 2019
• Publicly Available Date: Feb 11, 2019
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Pages: 914-919
• Series ISSN: 2572-6013
• ISBN: 9781538659816
• DOI: https://doi.org/10.1109/ICRERA.2018.8567014
• Keywords: Dual active bridge (DAB); Triple phase shift (TPS)
• Public URL: http://hdl.handle.net/10059/3289