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

The Korean Institute of Power Electronics (전력전자학회)
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Parallel Operation Control Method of Grid-connected Inverters with Seamless Transfer for Energy Storage System in Microgrid

마이크로그리드에서 에너지 저장시스템을 위한 무순단 절체 기능을 갖는 계통연계형 인버터의 병렬운전 제어기법

  • Park, Sung-Youl (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Kim, Joo-Ha (Vehicle Control Technology) ;
  • Jung, Ah-Jin (Korea Automotive Technology Institute) ;
  • Choi, Se-Wan (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)
  • Received : 2016.01.14
  • Accepted : 2016.03.28
  • Published : 2016.06.20
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Abstract

In the microgrid, inverters for energy storage system are generally constructed in a parallel structure because of capacity expandability, convenience of system maintenance, and reliability improvement. Parallel inverters are required to provide stable voltage to the critical load in PCC and to accurately share the current between each inverter. Furthermore, when islanding occurs, the inverters should change its operating mode from grid-connected mode to stand-alone mode. However, during clearing time and control mode change, the conventional control method has a negative impact on the critical load, that is, severe fluctuating voltage. In this study, a parallel operation control method is proposed. This method provides seamless mode transfer for the entire transition period, including clearing time and control mode change, and has accurate current sharing between each inverter. The proposed control method is validated through simulation and experiment.

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References

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