Environmental Extreme Conditions for a Wave Energy Converter: An Integrated Wave-Structure Approach

Abstract

The process of finding values of extreme waves and their impacts on wave energy converter (WEC) responses, depends on both wave resources and WEC dynamic characteristics. A wide range of waves can influence the reliability of operation and survivability of a WEC. In this paper, a methodology is described to find specific values of wave heights and periods that can be critical for a flap-type WEC, through the use of an integrated wave-structure approach. The goodness of the fit is studied and the corresponding return periods for ranges that a selected WEC is mostly operating are evaluated. Further discussions for engineering applications and making a clear understanding of the extreme and operational conditions of the WEC are also provided. The critical wave characteristics are defined based on power production and the significant change in the nonlinear dynamic behavior of the device in various ranges. The WEC behavior is represented by an experimentally validated numerical tool considering the nonlinear behaviour of a flap as single and in an array. The study aims to provide insights in the expected behavior and loading on the WEC, affecting its reliability, considering potential catastrophic wave return values that correspond to their power production phase. The finding can be used for determining both efficient operations and limiting environmental conditions or weather windows.

Review on floating wave-wind energy converter plants: Nonlinear dynamic assessment tools

“…Reduced surge and pitch motions due to the presence of two tidal turbines [35] Challenges Increased heave motion [35] Increased tension in mooring lines because of WEC and tidal turbines [35] 1) W2power [37] semi-submersible, HAWT, Oscillating body > 40 m [37] 4 [60], wind platform, 6 [38] Important features Two wind turbines ( 2 environmental conditions [21].…”

“…Therefore, it demands careful attention and a good understanding of the physical problems involved and their effects on the nonlinear dynamic response of the system [58,59]. Some of these effects, such as the perioddependent phenomena and the correlation between tank dimensions and floating objects, were studied during some experimental simulations [57,60]. However, many concerns related to the uncertainties in the reliability of the tests and the results remained to be addressed.…”