The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Islanding Detection for a Micro-Grid based on the Instantaneous Active and Reactive Powers in the Time Domain

시간영역에서 순시 유효/무효전력을 이용한 마이크로그리드의 단독운전 판단

  • 이영귀 (전북대 대학원 전기공학과) ;
  • 김연희 (전북대 대학원 전기공학과) ;
  • 정태영 (전북대 풍력에너지전력망적응기술연구센터) ;
  • 김태현 (명지전문대 정보공학부) ;
  • 강용철 (전북대 공대 전기공학과, 전북대 풍력에너지전력망 적응기술연구센터, 전북대 스마트그리드연구센터)
  • Received : 2011.11.20
  • Accepted : 2011.12.13
  • Published : 2012.01.01
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Abstract

Correct and fast detection of a micro-grid (MG) islanding is essential to the MG since operation, control and protection of the MG depend on an operating mode i.e., an interconnected mode or an islanding mode. When islanding occurs, the frequency of the point of common coupling (PCC) is not the nominal frequency during the transient state owing to the frequency rise or drop of generators in the MG. Thus, the active and reactive power calculated by the frequency domain based method such as Fourier Transform might contain some errors. This paper proposes an islanding detection algorithm for the MG based on the instantaneous active and reactive powers delivered to the dedicated line in the time domain. During the islanding mode, the instantaneous active and reactive powers delivered to the dedicated line are constants, which depend on the voltage of the PCC and the impedance of the dedicated line. In this paper, the instantaneous active and reactive powers are calculated in the time domain and used to detect islanding. The performance of the proposed algorithm is verified under various scenarios including islanding conditions, fault conditions and load variation using the PSCAD/EMTDC simulator. The results indicate that the algorithm successfully detects islanding for the MG.

Keywords

References

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