Model Predictive Control of a Direct Wave Energy Converter Constrained by the Electrical Chain using an Energetic Approach
Résumé
The control strategy for Direct Wave Energy Converters (DWEC) is often discussed without taking into account the physical limitations of electric Power TakeOff (PTO) system. This inappropriate modelling assumption leads to a non-realistic or a bad use of the electric systems, that leads to a failure to minimize the global " per-kWh " system cost. We propose here a Model Predictive Control (MPC) that takes into account the main limits of an electrical chain: maximum force, maximum power and a simplified loss model of the electrical chain. To compare this optimal control with other strategies, we introduce the notions of control, electric and global energy efficiencies. Furthermore, we use an original energy representation used to value the state at the end of the MPC horizon. Finally, we make several sensitivity study on the constraint limits for an economical pre-sizing of the electrical chain.
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