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Contrôle collaboratif d’une ferme de génératrices houlomotrices

Abstract : The next generation of wave farms will becomposed of a large number of identical devices deployed offshore, which will transfer the retrieved energy to the shore using submarine cables. It hasbeen proven that the control of Wave Energy Converters can improve their efficiency. However, one of the main challenges of WEC control is the noncausality of the optimal controller. Indeed, the time domain application of this kind of control requires the forecast of the excitation force applied by the wavefield on each device of the farm. The work presented in this thesis aimed at developing and assessing a control strategy with an energy efficiency close to the theoretical optimum, taking into account the hydrodynamic interactions between the farm devices, and solving the non-causality issue using the measurements of the states of the device of the array. First, the equations linking the devices’ states within the array have been established and used to performa deterministic forecast of the states of the controlled bodies, which allowed to apply a pseudo-causal reactive control. Moreover, a window function hasbeen applied to the controller impedance in order to constrain the dynamic of the controlled bodies, and also to regulate the non-causal horizon of the controller. Then, using a time domain simulator developed specifically, a sensibility analysis has been performed to define the optimal parameters and the behavior of the controller with the window function.The robustness and the performances of the controller have also been assessed when affected by exterior changes such as device drift, wave orientation modification, and directional spreading of the wave spectrum. The collaborative controlled strategy applied to a farm of 10 devices has shown an energy efficiency over 83% of the theoretical bound.
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Submitted on : Tuesday, December 18, 2018 - 4:59:06 PM
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Paul-Emile Meunier. Contrôle collaboratif d’une ferme de génératrices houlomotrices. Mécanique des fluides [physics.class-ph]. École centrale de Nantes, 2018. Français. ⟨NNT : 2018ECDN0039⟩. ⟨tel-01959432⟩

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