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

The Korean Institute of Power Electronics (전력전자학회)
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A PCS Control Strategy for Hybrid ESS with Function of Emergency Power Supply

비상전원 기능을 갖는 하이브리드 ESS를 위한 PCS 제어전략

  • Kim, Sang-Jin (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Kwon, Min-Ho (Dept. of Electrical & Information 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) ;
  • Paik, Seok-Min (Dept. Technology Research Institute KUKJE Electric Mfg. co., Ltd.) ;
  • Kim, Mi-Sung (Dept. EMC Research Institute Energy Industry Team, Korea Testing & Research Institute)
  • Received : 2016.03.21
  • Accepted : 2016.06.02
  • Published : 2016.08.20
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Abstract

This paper proposes a hybrid ESS that integrates an energy storage system (ESS) with an uninterruptible power supply (UPS). The hybrid ESS has a demand management and emergency power supply function while increasing the battery utilization of the UPS, which has just been used in a power failure. In addition to the critical load, the proposed system augments the capacity of emergency generation using an additional load, which has voltage and frequency-dependent characteristics to the grid side. The control algorithm of the AC-DC converter and bidirectional DC-DC converter is proposed for demand management and emergency power supply. Furthermore, seamless and autonomous transfer methods to alleviate the transient during mode transfer are proposed. To validate the proposed control scheme, experimental results from a 5 kW prototype are provided.

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References

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