Abstract
The aim of this paper is to present a novel wave energy converter device concept that is being developed at the National Renewable Energy Laboratory. The proposed concept combines an oscillating surge wave energy converter with active control surfaces. These active control surfaces allow for the device geometry to be altered, which leads to changes in the hydrodynamic properties. The device geometry will be controlled on a sea state time scale and combined with wave-to-wave power-take-off control to maximize power capture, increase capacity factor, and reduce design loads. The paper begins with a traditional linear frequency domain analysis of the device performance. Performance sensitivity to foil pitch angle, the number of activated foils, and foil cross section geometry is presented to illustrate the current design decisions; however, it is understood from previous studies that modeling of current oscillating wave energy converter designs requires the consideration of nonlinear hydrodynamics and viscous drag forces. In response, a nonlinear model is presented that highlights the shortcomings of the linear frequency domain analysis and increases the precision in predicted performance.
Original language | American English |
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Number of pages | 12 |
State | Published - 2015 |
Event | European Wave and Tidal Energy Conference - Nantes, France Duration: 6 Sep 2015 → 11 Sep 2015 |
Conference
Conference | European Wave and Tidal Energy Conference |
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City | Nantes, France |
Period | 6/09/15 → 11/09/15 |
NREL Publication Number
- NREL/CP-5000-64545
Keywords
- active geometry
- load shedding
- NREL
- oscillating surge WEC
- time-varying parameters
- wave energy converters
- WEC