Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A study on Optimal Operation of Protection Coordination Devices Evaluation System in Distribution System with Distributed Sources

분산전원이 연계된 배전계통에 보호협조기기 평가시스템의 최적운용에 관한 연구

  • Ji, Sungho (Electrical Electronics & Communication Engineering, Korea University of Technology and Education) ;
  • Song, Bangwoon (Electrical Electronics & Communication Engineering, Korea University of Technology and Education) ;
  • Kim, Byungki (Electrical Electronics & Communication Engineering, Korea University of Technology and Education) ;
  • Rho, Daeseok (Electrical Electronics & Communication Engineering, Korea University of Technology and Education)
  • 지성호 (한국기술교육대 전기전자통신공학부) ;
  • 송방운 (한국기술교육대 전기전자통신공학부) ;
  • 김병기 (한국기술교육대 전기전자통신공학부) ;
  • 노대석 (한국기술교육대 전기전자통신공학부)
  • Received : 2013.03.28
  • Accepted : 2013.06.07
  • Published : 2013.06.30
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Abstract

Recently, with the world-wide issues about global warming and CO2 reduction, a number of distributed generations(DGs) such as photovoltaic(PV) and wind power(WP), are interconnected with the distribution systems. However, DGs can change the direction of the power flow from one-direction to bi-direction, and also change the direction and amount of fault current of existing distribution systems. Therefore, it may cause the critical problems on the power quality and protection coordination. This paper proposes an operation algorithm for bi-directional protection coordination using and apply it for the evaluation system for protection coordination. From the simulation results It is found that the proposed method is more effective and convenient than existing method.

최근 배전계통은 정부의 녹색성장 정책으로 태양광, 풍력발전 등과 같은 분산전원의 보급률이 지속적으로 증가되고 있는 실정이다. 이러한 분산전원의 연계로 기존 배전계통의 조류흐름은 단방향(One-direction)에서 양방향(Bi-direction)으로 변화되고, 고장전류의 증 감이 발생하는 등, 다양한 변화가 생겨 배전계통의 운용상에 여러 가지 문제점들이 발생할 가능성이 커지고 있다. 따라서 본 논문에서는 분산전원의 배전계통 연계에 따른 보호기기의 정정 및 양방향 보호협조 검토가 가능한 보호협조 평가알고리즘과 실제의 사고전류 값을 이용한 개선된 T-C곡선 알고리즘을 제안하고, 이 알고리즘을 바탕으로 양방향 보호협조 평가시스템을 개선하였다. 또한 평가시스템을 이용하여 배전계통을 모델링하고, 분산전원 연계 시 보호기기들 간의 보호협조를 검토하여, 분산전원이 연계된 경우 배전계통에 발생할 수 있는 기술적인 문제점들을 분석하여 그 방안을 제시하였다.

Keywords

References

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