Practical Dead-Time Control Methodology of a Three-Phase Dual Active Bridge Converter for a DC Grid System

Hyun-Jun Choi, Jung-Hoon Ahn, Jee-Hoon Jung and Sung-Geun Song ()
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Hyun-Jun Choi: Korea Electronics Technology Institute (KETI), Seongnam 13509, Republic of Korea
Jung-Hoon Ahn: Korea Electronics Technology Institute (KETI), Seongnam 13509, Republic of Korea
Jee-Hoon Jung: Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
Sung-Geun Song: Korea Electronics Technology Institute (KETI), Seongnam 13509, Republic of Korea

Energies, 2023, vol. 16, issue 22, 1-18

Abstract: An effective dead-time control strategy for the three-phase dual active bridge (3P-DAB) converter of a distribution system is studied to reduce the switching losses of power switches and improve the under-light-load power conversion efficiency. Because of the advantages of a dual-active bridge converter, such as an inherent zero-voltage switching (ZVS) capability without any additional resonant tank and a seamless bi-directional power transition, this is an attractive topology for bi-directional application. The 3P-DAB converter is apt for high-power applications such as aircraft due to an interleaved structure, which can reduce conduction losses. However, the design of the dead time depends on engineering experience and empirical methods. In order to overcome the conventional practicality of the dead-time design method, the effective control of dead time is proposed based on the theoretical analysis. In this paper, the overall explanation of the 3P-DAB converter is shown with operation principles. In addition, the dead-time effect of the 3P-DAB converter is examined and the practical variable dead-time control strategy is studied. Finally, experimental results validate the proposed variable dead-time control strategy using a 25 kW prototype 3P-DAB converter.

Keywords: three-phase dual active bridge converter; variable dead-time control; bi-directional DC–DC converter; switching losses; soft switching (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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