Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Design of a 50kW Class Rotating Body Type Highly Efficient Wave Energy Converter

50kW급 가동물체형 고효율 파력발전시스템 설계

  • 조병학 (한전 전력연구원 녹색성장연구소) ;
  • 양동순 (한전 전력연구원 녹색성장연구소) ;
  • 박신열 (한전 전력연구원 녹색성장연구소) ;
  • 최경식 (한전 전력연구원 녹색성장연구소) ;
  • 박병철 (한전 전력연구원 녹색성장연구소)
  • Received : 2011.07.08
  • Accepted : 2011.08.22
  • Published : 2011.08.30
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Abstract

A 50 kW class rotating body type wave energy converter consisted of two floating bodies and a PTO (Power Takeoff) unit is studied. As an wave energy extractor, the body is designed to have a VLCO (Variable Liquid-Column Oscillator) having a liquid filled U-tube with air chambers. Owing to the oscillation of the liquid in the U-tube caused by the air spring effect of the air chambers, the amplitude of response of the VLCO becomes significantly amplified for a target wave period. The PTO converts the rotational moment introduced from the relative motion of the hinged bodies to an hydraulic power by means of a cylinder. A high pressure accumulator, hydraulic motor and a generator are equipped in the PTO to convert the hydraulic power to electric power. A control law for adjusting the oscillation period of the VLCO is proposed for the efficient operation of the VLCO with various wave conditions. It is found that the effect of the air spring has an important role to play in making the oscillation of the VLCO match with the ocean wave. In this way, the wave energy converter equipped with the VLCO provides the most effective mode for extracting energy from the ocean wave.

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References

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