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Analysis of Response of a Wind Farm During Grid/inter-tie Fault Conditions

그리드/연계선 사고 시 풍력발전단지의 응동 분석

  • 이혜원 (전북대 공대 전기공학과) ;
  • 김연희 (전북대 공대 전기공학과) ;
  • 정태영 (전북대 공대 전기공학과) ;
  • 이상철 (전북대 공대 전기공학과) ;
  • 강용철 (전북대 공대 전기공학과)
  • Received : 2011.01.06
  • Accepted : 2011.05.16
  • Published : 2011.06.01

Abstract

In a wind farm, a large number of small wind turbine generators (WTGs) operate whilst a small number of a large generator do in a conventional power plant. To maintain high quality and reliability of electrical energy, a wind farm should have equal performance to a thermal power plant in the transient state as well as in the steady state. The wind farm shows similar performance to the conventional power plant in the steady state due to the advanced control technologies. However, it shows quite different characteristics during fault conditions in a grid, which gives significant effects on the operation of a wind farm and the power system stability. This paper presents an analysis of response of a wind farm during grid fault conditions. During fault conditions, each WTG might produce different frequency components in the voltage. The different frequency components result in the non-fundamental frequencies in the voltage and the current of a wind farm, which is called by "beats". This phenomenon requires considerable changes of control technologies of a WTG to improve the characteristics in the transient state such as a fault ride-through requirement of a wind farm. Moreover, it may cause difficulties in protection relays of a wind farm. This paper analyzes the response of a wind farm for various fault conditions using a PSCAD/EMTDC simulator.

Acknowledgement

Supported by : 한국연구재단, 기초전력연구원

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