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

The Korean Institute of Electrical Engineers (대한전기학회)
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Distance Relaying Algorithm for Intertie Protection of a Wind Farm Considering the Fault Ride-through Requirement

Fault ride-through 요구를 고려한 풍력발전단지 연계선 보호 거리계전 알고리즘

  • 강용철 (전북대 대학원 전기공학과) ;
  • 강해권 (전북대 대학원 전기공학과) ;
  • 정태영 (전북대 대학원 전기공학과) ;
  • 김연희 (전북대 대학원 전기공학과) ;
  • 이영귀 (전북대 대학원 전기공학과)
  • Received : 2010.04.22
  • Accepted : 2010.05.25
  • Published : 2010.06.01
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Abstract

A large modern wind farm should satisfy the requirements for a grid and accomplish the optimization of the wind farm system. The wind farm intertie protection system should consider a Fault Ride-Through (FRT) requirement for more reliable protection. The wind farm should keep connected to the grid in the case of a grid fault whilst it should be isolated for an intertie fault. This paper proposes a distance relaying algorithm suitable for wind farm intertie protection considering the FRT requirement. The proposed algorithm estimates the impedance based on a differential equation method because the frequency of the voltage and current deviates the nominal frequency. The algorithm extends the reach of Zone 1 up to 100 % of the length of the intertie to implement the FRT requirement. To discriminate an intertie fault from a grid fault, the algorithm uses a voltage blocking scheme because the magnitude of the voltage at the relaying point for an intertie fault becomes less than that for a grid fault. The performance of the algorithm is verified using a PSCAD/EMTDC simulator under various fault conditions. The algorithm can discriminate successfully the intertie fault from grid fault and thus helps to implement the FRT requirement of a wind farm.

Keywords

References

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