A Study on the Improved Protective Relaying Algorithm Applied in the Linked System Interconnecting Wind Farm with the Utilities

풍력발전단지 연계 전용선로 보호계전방식의 향상에 대한 연구

  • 장성일 (서울대 정보기술사업단) ;
  • 김광호 (강원대 전기전자정보통신공학부/차세대전력 기술 연구센터) ;
  • 권혁완 (한국전력공사 제천전력관리처) ;
  • 김대영 (한국전력공사 제천전력관리처) ;
  • 권혁진 (한국전력공사 제천전력관리처)
  • Published : 2003.12.01

Abstract

This paper describes the correction strategy of an overcurrent relay applied in the linked line for interconnecting wind farm with utility power networks in order to improve the capability of a fault detection. The fault current measured in a relaying point might vary according to the fault conditions. Generally, the current of the line to line fault or the line to ground fault in the linked line is much higher than the set value of protective relay due to the large fault level. However, when the high impedance fault occurs in the linked line, we can't detect it by conventional set value because its fault level may be lower than the generating capacity of wind farm. And, the protective relay with conventional set value may generate a trip signal for the insertion of wind turbine generators due to the large transient characteristics. In order to solve above problems and improve protective relaying algorithms applied in the linked line, we propose a new correction strategy of the protective relay in the linked line. The presented method can detect the high impedance fault which can't be detected by conventional relay set value and may prevent the mis-operation of protective relay caused by the insertion of wind farm.

Keywords

References

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