Journal of Wind Energy (풍력에너지저널)

Korea Wind Energy Association (한국풍력에너지학회)
권호 표지

Tower Load Reduction Control by Pitch Loop Individual Gain Scheduling

피치 루프 개별 게인 스케줄링 기법을 통한 타워 하중 저감 제어

  • 김철진 (강원대학교, 기계융합공학과) ;
  • 김관수 (강원대학교, 기계융합공학과) ;
  • 송원 (강원대학교, 기계융합공학과) ;
  • 백인수 (강원대학교, 기계의용.메카트로닉스.재료 공학부)
  • Received : 2018.08.06
  • Accepted : 2018.09.05
  • Published : 2018.09.30

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Abstract

This paper deals with the National Renewable Energy Laboratory (NREL) 5 MW reference wind turbine for offshore systems. The controller, which includes Maximum Power Point Tracking (MPPT) control to recover the maximum energy from wind and pitch control to limit the power output, is applied to wind turbines. Conventional pitch loops have used the same sensitivity scheduling to the P gain signal and I gain signal (Collective Pitch gain Scheduling, or CPS). However, this technique only focuses on power control without considering the load on the wind turbine. In addition, the stability of the system cannot be guaranteed since the pitch control loop has a low phase margin. Therefore, this paper proposes a technique that applies gain scheduling individually to the P gain signal and the I gain signal (Individual Pitch gain Scheduling, or IPS) for load reduction. To verify the effect, electrical power and tower root moment damage equivalent load (DEL) were set as performance indices. Simulations were performed for 600 seconds under the wind conditions of the normal turbulence model, with turbulence intensity of 16 % and wind speeds of 12~25 m/s. The proposed IPS technique was found to reduce the fore-aft moment DEL of the tower by up to 14.49 % more than the existing collective pitch scheduling.

Keywords

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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