Numerical Analysis on Hydraulic Power Take-Off for Wave Energy Converter and Power Smoothing Methods

Yi-Hsiang Yu, Nathan Tom, Dale Jenne

Research output: Contribution to conferencePaperpeer-review

30 Scopus Citations

Abstract

One of the primary challenges for wave energy converter (WEC) systems is the fluctuating nature of wave resources, which require the WEC components to be designed to handle loads (i.e., torques, forces, and powers) that are many times greater than the average load. This approach requires a much greater power take-off (PTO) capacity than the average power output and indicates a higher cost for the PTO. Moreover, additional design requirements, such as battery storage, are needed, particularly for practical electrical grid connection, and can be a problem for sensitive equipment (e.g., radar, computing devices, and sensors). Therefore, it is essential to investigate potential methodologies to reduce the overall power fluctuation while trying to optimize the power output from WECs. In this study, a detailed hydraulic PTO model was developed and coupled with a time-domain hydrodynamics model (WEC-Sim) to evaluate the PTO efficiency for WECs and the trade-off between power output and fluctuation using different power smoothing methods, including energy storage, pressure relief mechanism, and a powerbased setpoint control method. The study also revealed that the maximum power fluctuation for WECs can be significantly reduced by one order of magnitude when these power smoothing methods are applied.

Original languageAmerican English
Number of pages10
DOIs
StatePublished - 2018
EventASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018 - Madrid, Spain
Duration: 17 Jun 201822 Jun 2018

Conference

ConferenceASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018
Country/TerritorySpain
CityMadrid
Period17/06/1822/06/18

Bibliographical note

See NREL/CP-5000-71078 for preprint

NREL Publication Number

  • NREL/CP-5000-72834

Keywords

  • Hydraulic PTO
  • Power take-off (PTO)
  • Power-based setpoint control
  • Renewable energy
  • Wave energy converter

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