Method for controlling a wave power system by means of a control obtained by minimizing an objective function weighted and discretized by the trapezoidal rule
AssigneeIfp Energies Nouvelles
InventorsPaolino Tona, Hoai-Nam Nguyen
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Abstract
The present invention provides improvement of the operation of a wave energy system by use of a method for predictive control (COM) of the converter machine that maximizes the energy generated by considering the energy conversion efficiency (MOD ENE) and a wave prediction (PRED). Furthermore, the method according to the invention determines the optimal control by minimizing an objective function weighted and discretized by the trapezoidal rule.
Claims23
A method of controlling a wave energy system that converts energy of waves into electrical or hydraulic energy, the wave energy system comprising at least one mobile device that cooperates with at least one energy converter machine, and the at least one mobile device oscillates in motion with respect to the at least one energy converter machine, comprising:
- a) constructing a dynamic model of the wave energy system relating velocity of the at least one mobile device to a force exerted by the waves on the at least one mobile device and to the force exerted by the at least one energy converter machine on the at least one mobile device;
- b) constructing an energy model of the wave energy system relating average power generated by the at least one energy converter machine to force exerted by the at least one energy converter machine on the at least one mobile device to the velocity of the at least one mobile device and to the efficiency of the wave energy system;
- c) predicting the force exerted by the waves on the at least one mobile device for a predetermined time period;
- d) determining a control value of the force exerted by the at least one energy converter machine on the at least one mobile device which maximizes average power generated by the at least one energy converter machine by:
- i) determining an objective function representative of the power generated by the at least one energy converter machine by use of the prediction of the force exerted by the waves on the at least one mobile device, of the dynamic model and of the energy model;
- ii) discretizing the objective function by a trapezoidal rule;
- and
- iii) weighting, in the discretized objective function, future values of control by predetermined weighting coefficients;
- iv) determining the control value from the force exerted by the at least one energy converter machine on the at least one mobile device by minimizing the discretized and weighted objective function;
- and
- e) controlling the at least one energy converter machine by use of the control value.
Dependencies are inferred from the claim text.