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A multiport isolated DC-DC converter

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Author Tran Yan-Kim, Dujic Drazen,
Project Integration of Intermittent Widespread Energy Sources in Distribution Networks: Scalable and Reliable Real Time Control of Power Flows
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Proceedings (peer-reviewed)

Page(s) 156 - 162
Title of proceedings IEEE Applied Power Electronics Conference and Exposition (APEC)
Place Long Beach, CA

Open Access


This paper presents a multi-port isolated DC-DC converter for DC applications. A three-port structure is pre- sented, characterized with full bidirectional power flow and simple control. Galvanic isolation is achieved by means of a multi-winding medium frequency transformer which is a part of a resonant LLC converter. To provide controllable power exchange with external DC ports, two out of three ports are equipped with additional bidirectional buck/boost stages. They serve to provide active power flow control, while the inner resonant stage provides galvanic isolation, operates in the open-loop and adapts its mode of operation based on the actual power flow. Both switched mode and rea-time hardware-in-the-loop simulations, with control algorithm deployed on the digital signal processor, are used to verify and demonstrate various operational modes.