Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Isolated three-port DC-DC converter employing ESS to obtain voltage balancing capability for bipolar LVDC distribution system

  • Sim, Juyoung (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Lee, Jun-Young (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Jung, Jee-Hoon (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • Received : 2019.10.22
  • Accepted : 2019.11.23
  • Published : 2020.05.20
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Abstract

A bipolar low-voltage DC (LVDC) distribution system used in residential and building applications requires AC-DC converters and voltage balancers that balance the two DC bus polarities. The bipolar DC bus voltage level only relies on the voltage balancer tied with the AC grid. An isolated DC-DC converter for an energy storage system (ESS) with the voltage balancing capability is proposed to prevent the bipolar voltage level collapse caused by the failure of the grid-tied voltage balancer. The proposed converter topology is an enhanced three-port dual-active-bridge (DAB) converter which can balance the bipolar DC voltage level without complex control. Furthermore, it has less current stress in power switches than that of the conventional three-port DAB converter. The effectiveness of the proposed converter is verified with a 3-kW prototype converter.

Keywords

Acknowledgement

This work was supported by Korea Electric Power Corporation (R18XA06-72).

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