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Bidirectional power sharing in an ac/dc system with a dual active bridge converter

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Open access
Authors
Datta, Amit Jyoti
Ghosh, Arindam
Zare, Firuz
Rajakaruna, Sumedha
Date
2019
Type
Journal Article

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Datta, A.J. and Ghosh, A. and Zare, F. and Rajakaruna, S. 2019. Bidirectional power sharing in an ac/dc system with a dual active bridge converter. IET Generation, Transmission and Distribution. 13 (4): pp. 495-501.
Source Title
IET Generation, Transmission and Distribution
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Faculty
Faculty of Science and Engineering
School
School of Elec Eng, Comp and Math Sci (EECMS)
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This is the peer reviewed version of the following article: Datta, A.J., Ghosh, A., Zare, F. and Rajakaruna, S. (2019), Bidirectional power sharing in an ac/dc system with a dual active bridge converter. IET Gener. Transm. Distrib., 13: 495-501, which has been published in final form at https://doi.org/10.1049/iet-gtd.2018.5304. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

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Abstract

This study introduces a bidirectional power sharing scheme between an ac electric utility and a dc microgrid. These two are connected together through an interlinking converter (IC) and a dual active bridge (DAB). The proposed control scheme allows predefined amount of power to be supplied from the ac to dc side or the other way around. The DAB is connected at the dc side of the IC and it controls the bidirectional power flow. The dc microgrid contains dc-dc converters, where boost converters are used with the sources and buck converters are used to supply loads. These dc-dc converters and the DAB are controlled by state feedback with integral control in a linearised discrete domain. The DAB linearisation and control law are presented in detail. The dc microgrid is controlled by conventional V-P droop where the power from/to the ac side is considered as negative/positive load. Detailed simulation results are presented to validate the proposal. Also some hardware results are included that support the findings.