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A Seamless Transfer Method of Bidirectional DC-DC Converter for ESS in DC Micro-grids

DC 마이크로그리드에서 에너지 저장장치를 위한 양방향 DC-DC컨버터의 무순단 절체 제어기법

  • Kwon, Min-Ho (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Park, Jung-Sung (Dept. of New Energy Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Choi, Se-Wan (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)
  • Received : 2013.12.26
  • Accepted : 2014.02.21
  • Published : 2014.04.20

Abstract

In DC micro-grid system energy storage systems (ESS) are responsible for storing energy and balancing power. Also, control target of the bidirectional DC-DC converter(BDC) for ESS should be changed depending on the operating mode. During the grid connected mode, the BDC controls the battery current or voltage. When a grid fault occurs, the BDC should change the control target to regulate the DC-bus. The BDC with conventional control method may experience large transient state during the mode change. This paper proposes a control method of BDC for ESS. The proposed control method is able to provide autonomous and seamless mode transfer by a variable current limiter. To validate the proposed concept, simulation results using PSIM and experimental results from a 2kW prototype are provided.

Keywords

References

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