• 제목/요약/키워드: 브레이드 모델

검색결과 3건 처리시간 0.018초

풍력 시스템 하중 절감을 위한 피치 제어에 관한 연구 (A Study on Pitch Control for Load - Reducing of Wind Turbine)

  • 김성호;윤용하;이현주;최원호;이승구
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2007년도 춘계학술대회
    • /
    • pp.374-377
    • /
    • 2007
  • This paper deals with a pitch control for reducing load of the wind turbine system. To make a model of the wind turbine system, the Momentum Theory and Blade Element Theory are used. Considering wind shear, wind model was also built. Due to a difference of the wind speed between upper parts and lower parts of the sweep area, overturning moment of the wind turbine is generated. So, in this paper through analyzing of the system model of the wind turbine, a control algorithm which was able to achieve both maintaining power and reducing overturning moment was proposed. Using matlab simulink, controller performance was verified.

  • PDF

Reverse Brayton 사이클과 Claude 사이클 기반 LNG 재액화 공정의 동특성 운전성능 비교 (Comparison of Dynamic Operation Performance of LNG Reliquefaction Processes based on Reverse Brayton Cycle and Claude Cycle)

  • 신영기;서정아;이윤표
    • 설비공학논문집
    • /
    • 제20권12호
    • /
    • pp.775-780
    • /
    • 2008
  • A dynamic model to simulate LNG reliquefaction process has been developed. The model was applied to two candidate cycles for LNG reliquefaction process, which are Reverse Brayton and Claude cycles. The simulation was intended to simulate the pilot plant under construction for operation of the two cycles and evaluate their feasibility. According to the simulation results, both satisfy control requirements for safe operation of brazed aluminum plate-fin type heat exchangers. In view of energy consumption, the Reverse Brayton cycle is more efficient than the Claude cycle. The latter has an expansion valve in addition to the common facilities sharing with the Reverse Brayton cycle. The expansion valve is a main cause to the efficiency loss. It generates a significant amount of entropy associated with its throttling and increases circulation flow rates of the refrigerant and power consumption caused by its leaking resulting in lowered pressure ratio. It is concluded that the Reverse Brayton cycle is more efficient and simpler in control and construction than the Claude cycle.