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Discrete Displacement Hydraulic Power Take-Off System for the Wavestar Wave Energy Converter

Author

Listed:
  • Rico H. Hansen

    (Department of Energy Technology, Aalborg University, Pontoppidanstrade 101, Aalborg DK-9220, Denmark
    Wavestar, Park Alle 350A, Broendby DK-2605, Denmark)

  • Morten M. Kramer

    (Wavestar, Park Alle 350A, Broendby DK-2605, Denmark)

  • Enrique Vidal

    (Wavestar, Park Alle 350A, Broendby DK-2605, Denmark)

Abstract

The Wavestar Wave Energy Converter (WEC) is a multiple absorber concept, consisting of 20 hemisphere shaped floats attached to a single platform. The heart of the Wavestar WEC is the Power Take-Off (PTO) system, converting the wave induced motion of the floats into a steady power output to the grid. In the present work, a PTO based on a novel discrete displacement fluid power technology is explored for the Wavestar WEC. Absorption of power from the floats is performed by hydraulic cylinders, supplying power to a common fixed pressure system with accumulators for energy smoothing. The stored pressure energy is converted into electricity at a steady pace by hydraulic motors and generators. The storage, thereby, decouples the complicated process of wave power absorption from power generation. The core for enabling this PTO technology is implementing a near loss-free force control of the energy absorbing cylinders. This is achieved by using special multi-chambered cylinders, where the different chambers may be connected to the available system pressures using fast on/off valves. Resultantly, a Discrete Displacement Cylinder (DDC) is created, allowing near loss free discrete force control. This paper presents a complete PTO system for a 20 float Wavestar based on the DDC. The WEC and PTO is rigorously modeled from incident waves to the electric output to the grid. The resulting model of +600 states is simulated in different irregular seas, showing that power conversion efficiencies above 70% from input power to electrical power is achievable for all relevant sea conditions.

Suggested Citation

  • Rico H. Hansen & Morten M. Kramer & Enrique Vidal, 2013. "Discrete Displacement Hydraulic Power Take-Off System for the Wavestar Wave Energy Converter," Energies, MDPI, vol. 6(8), pages 1-44, August.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:8:p:4001-4044:d:27806
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    References listed on IDEAS

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    1. Joseba Lasa & Juan Carlos Antolin & Carlos Angulo & Patxi Estensoro & Maider Santos & Pierpaolo Ricci, 2012. "Design, Construction and Testing of a Hydraulic Power Take-Off for Wave Energy Converters," Energies, MDPI, vol. 5(6), pages 1-23, June.
    2. Henderson, Ross, 2006. "Design, simulation, and testing of a novel hydraulic power take-off system for the Pelamis wave energy converter," Renewable Energy, Elsevier, vol. 31(2), pages 271-283.
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