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Energies 2018, 11(6), 1569;

Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control

Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau SAR 999078, China
Author to whom correspondence should be addressed.
Received: 8 May 2018 / Revised: 11 June 2018 / Accepted: 12 June 2018 / Published: 14 June 2018
(This article belongs to the Section Electrical Power and Energy System)
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The manipulation of the bidirectional power in a dual-active-bridge converter relies on the adjustment of several phase-shift angles. Improper implementation of those adjustments during the transient process of a step load change may induce transient DC bias current in the transformer and accompanied high peak current, which may result in excess loss and safety issues potentially. The paper proposes a load transient modulation to execute the adjustments of the two phase-shift angles for extended-phase-shift (EPS) control in a predictive manner. An unknown phase-shift is introduced to the gating signals of one bridge arm, and the gating signals of other bridge arms would be modified accordingly to realize the required adjustment of the two phase-shift angles together. With the proper selection of the introduced phase-shift, the power adjustment can be done in less than one high-frequency cycle without resulting in DC bias and overshoot current. Although there are four different operation modes existing in EPS, a universal solution of the unknown phase-shift can be obtained for all possible power transition cases between different modes. Validation of the proposed method is performed by means of both simulation and experimental tests. View Full-Text
Keywords: dual-active-bridge (DAB); extended-phase-shift control; DC-DC converter dual-active-bridge (DAB); extended-phase-shift control; DC-DC converter

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Sun, C.; Li, X. Fast Transient Modulation for a Step Load Change in a Dual-Active-Bridge Converter with Extended-Phase-Shift Control. Energies 2018, 11, 1569.

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