Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Mitigation of Mechanical Loads of NREL 5 MW Wind Turbine Tower

NREL 5MW 풍력 터빈 타워의 기계적 하중 완화

  • Nam, Yoon-Su (Dept. of Mechanical and Mechatronics Engineering, Kangwon Nat'l Univ.) ;
  • Im, Chang-Hee (Dept. of Mechanical and Mechatronics Engineering, Kangwon Nat'l Univ.)
  • 남윤수 (강원대학교 기계.메카트로닉스공학과) ;
  • 임창희 (강원대학교 기계.메카트로닉스공학과)
  • Received : 2012.05.02
  • Accepted : 2012.06.07
  • Published : 2012.11.01
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Abstract

As the size of a wind turbine increases, the mechanical structure has to have an increasing mechanical stiffness that is sufficient to withstand mechanical fatigue loads over a lifespan of more than 20 years. However, this leads to a heavier mechanical design, which means a high material cost during wind turbine manufacturing. Therefore, lightweight design of a wind turbine is an important design constraint. Usually, a lightweight mechanical structure has low damping. Therefore, if it is subjected to a disturbance, it will oscillate continuously. This study deals with the active damping control of a wind turbine tower. An algorithm that mitigates the mechanical loads of a wind turbine tower is introduced. The effectiveness of this algorithm is verified through a numerical simulation using GH Bladed, which is a commercial aero-elastic code for wind turbines.

풍력 터빈의 용량이 대형화될수록, 난류성분에 의한 풍력 터빈 구조물의 하중을 최소화시키는 하중완화 제어가 점차 중요해진다. 한번 설치되면 20 년 이상 작동되어야 하는 풍력 터빈 구조물은 끊임없이 바람에 의한 하중에 노출되는데, 이것이 적절하게 제어되지 않으면 풍력 터빈의 회전 반복운동에 의하여 피로파괴에 이르게 될 가능성이 커진다. 본 논문은 NREL 5MW 풍력 터빈을 대상으로 타워의 하중을 저감시키는 제어시스템을 설계하고, 이의 성능을 평가하는 내용을 담고 있다. 타워의 하중 완화제어시스템을 설계하려면 5MW 풍력 터빈의 동적 특성이 먼저 파악이 되어야 하며, 파워 커브를 추종하는 기본 제어시스템의 설계가 선행되어야 한다.

Keywords

References

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