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DC fault isolation study of bidirectional dual active bridge DC/DC converter for DC transmission grid application.

Harrye, Yasen A.; Ahmed, Khaled H.; Aboushady, Ahmed A.

Authors

Yasen A. Harrye

Khaled H. Ahmed

Ahmed A. Aboushady

Abstract

Fast isolation and detection of DC faults is currently a limiting factor in high power DC transmission grid development. Recent research has shown that the role of DC/DC converters is becoming increasingly important in solving various DC grid challenges such as voltage stepping, galvanic isolation and power regulation. This paper focuses on an additional important feature of bidirectional dual active bridge (DAB) DC-DC converters which make it attractive for future DC grids; it's inherent fault isolation capability which does not need control intervention to limit fault current in case of the most severe DC faults. Detailed analytical, simulation and experimental study are performed by subjecting the converter to DC short circuit faults at its DC voltage terminals. The results obtained have shown significant advantage of DAB where fault current is less than rated current during the fault duration. Thus no control action is necessary from the non-faulted bridge to limit fault current and no external DC circuit breakers are required. This advantage makes DAB converter feasible for DC grid integration.

Start Date Nov 9, 2015
Publication Date Nov 9, 2015
Publisher Institute of Electrical and Electronics Engineers
Pages 3193-3198
Institution Citation HARRYE, Y.A., AHMED, K.H. and ABOUSHADY, A.A. 2015. DC fault isolation study of bidirectional dual active bridge DC/DC converter for DC transmission grid application. In Proceedings of the 41st IEEE Industrial Electronics Society annual conference (IECON 2015), 9-12 November 2015, Yokohama, Japan. Piscataway: IEEE [online], pages 3193-3198. Available from: https://doi.org/10.1109/IECON.2015.7392592
DOI https://doi.org/10.1109/IECON.2015.7392592
Keywords DCDC converter; Dual active bridge (DAB) converter; DC fault; Voltage

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