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A Study on Setting SPS for Generator Tripping Action considering Operating Conditions of Power Systems

전력계통 운영조건을 고려한 발전기차단용 SPS 동작설정에 관한 연구

  • Gwon, Han Na (SGRC, Department of Electrical Engineering, Chonbuk National University) ;
  • Son, Hyeok Jin (SGRC, Department of Electrical Engineering, Chonbuk National University) ;
  • Kook, Kyung Soo (SGRC, Department of Electrical Engineering, Chonbuk National University) ;
  • Yang, Sung-Chae (SGRC, Department of Electrical Engineering, Chonbuk National University)
  • 권한나 (전북대학교 전기공학과, 스마트그리드연구센터) ;
  • 손혁진 (전북대학교 전기공학과, 스마트그리드연구센터) ;
  • 국경수 (전북대학교 전기공학과, 스마트그리드연구센터) ;
  • 양성채 (전북대학교 전기공학과, 스마트그리드연구센터)
  • Received : 2013.09.25
  • Accepted : 2014.01.09
  • Published : 2014.01.31

Abstract

Special Protection Scheme(SPS) for generator tripping action is an emergency control tool that secures the power system stability by instantly tripping the pre-determined number of generators to avoid the acceleration of the remaining generators in a large-scaled power plants when a fault occurs on the drawing transmission lines. However, since the existing operating conditions of SPS are set based on a peak demand, SPS could trip more generators than required if it is activated during the off-peak demand period. For this, this paper proposes the algorithm for setting the operating conditions of SPS through the online stability evaluation with the periodically updated operating conditions of power systems. The proposed algorithm adopts COA for the accuracy and speed of the stability evaluation, and can reduce the number of tripping generators by SPS during the off-peak demand period. This results in reducing the loss of profit caused by a fault on power systems.

발전기차단용 고장파급방지장치(SPS; Special Protection Scheme)는 대규모 발전단지의 인출 송전선로 고장시 발전단지 내의 발전기 과속을 방지하기 위해 사전에 계획된 대수만큼 해당 발전기를 즉시 차단하여 전력계통 전체의 안정도를 유지하는 비상 장치이다. 그러나 기존의 국내 발전기차단용 SPS 동작은 첨두부하를 기준으로 산정된 값을 일률적으로 적용하여 운영 되고 있어 경부하시에 발전기차단용 SPS가 동작을 하게 되면 발전기 과차단으로 인한 발전력 부족을 초래할 가능성이 있는 등 SPS 운영의 비효율성이 잠재되어있다. 이를 위해 본 논문에서는 수시로 변화하는 전력계통 운영조건을 주기적으로 취득하고 정확도와 속도가 우수한 COA기반의 안정도평가를 통해 발전기 차단용 SPS 동작을 설정함으로써 경부하시에는 SPS 발전기 탈락대수가 첨두수요 기준의 설정치보다 감소되어 계통 고장에 의한 SPS 동작 시 발전비용 증가를 경감 할 수 있다.

Keywords

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