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

The Korean Institute of Power Electronics (전력전자학회)
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Parallel Operation of Three-Phase Bi-Directional Isolated Interleaved DC-DC Converters for The Battery Charge/Discharge System

배터리 충·방전기 시스템에 적용되는 3상 양방향 절연형 인터리브드 DC-DC 컨버터의 병렬운전

  • Jo, Hyunsik (Dept. of Electrical Eng., Chungnam National University) ;
  • Lee, Jaedo (Dept. of Electrical Eng., Chungnam National University) ;
  • Cha, Hanju (Dept. of Electrical Eng., Chungnam National University)
  • Received : 2013.07.22
  • Accepted : 2013.11.07
  • Published : 2014.02.20
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Abstract

Recently, parallel operation of dc-dc converters has been widely used in distributed power systems. In this paper, a control method to achieve parallel operation of three-phase bi-directional isolated interleaved dc-dc converters is discussed for the battery charging and discharging system which consists of the 32 battery charger/dischargers and two three-phase bi-directional isolated interleaved dc-dc converters. In the boost mode, the battery energy is delivered to the grid, whereas the grid energy is transferred to the battery in the buck mode operation. The average current sharing control method is employed to obtain an equal conducting of each phase current in the three-phase dc-dc converter. By using the proposed method, the imbalance factor is gratefully reduced from 8 percent to 1 percent. Two 2.5kW three-phase bi-directional dc-dc converter prototype have been built and the proposed method has been verified through experiments.

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References

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