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.