Experimental Validation of a Nonlinear MPC Strategy for a Wave Energy Converter Prototype
Résumé
One of the major limitations to the development of advanced
wave energy converters (WECs) control strategies are the associated
computational costs. For instance, model predictive control
(MPC) strategies have the potential to obtain almost optimal
performance, provided that the imperfect power conversion in
the power take-off (PTO) system is correctly taken into account
in the optimization criterion and that the incoming wave force
can be estimated and forecast. However, demanding computational
requirements as well as the unresolved issue of wave force
estimation have so far prevented real-time implementation and
validation of such MPC strategies. In this paper, we present the
successful experimental results obtained on a scaled-down prototype
of the well-known Wavestar machine. Performance comparisons
are provided for nonlinear MPC versus a reference PI
controller.
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