The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Decoupled Power Control of Three-port Dual Active Bridge DC-DC Converter for DC Microgrid Systems

DC 마이크로 그리드를 위한 Three-port Dual Active Bridge DC-DC 컨버터의 독립 전력 제어

  • Sim, Ju-Young (School of Electrical & Computer Engineering, UNIST) ;
  • Lee, Jun-Young (School of Electrical & Computer Engineering, UNIST) ;
  • Choi, Hyun-Jun (School of Electrical & Computer Engineering, UNIST) ;
  • Kim, Hak-Sun (School of Electrical & Computer Engineering, UNIST) ;
  • Jung, Jee-Hoon (School of Electrical & Computer Engineering, UNIST)
  • Received : 2018.07.20
  • Accepted : 2018.09.18
  • Published : 2018.10.20
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Abstract

Three-port dual-active bridge (DAB) converter in a DC microgrid was studied due to its high power density and cost-effectiveness. The other advantages of DAB include galvanic isolation and bidirectional power conversion capability using simple control modulation. The three-port DAB converter consists of a three winding transformer and three bridges. The transformer has three phases, which means that the ports are coupled. Thus, the three-port DAB converter causes unwanted power flows when the load connected to each port changes. The basic operational principles of the three-port DAB converter are presented in this study. The decoupling control strategy of the independent port power transfer is presented with a mathematical power model to overcome the unexpected power flow problem. The validity of the proposed analysis and control strategy is verified with PSIM simulation and experiments using a 1-kW prototype power converter.

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References

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