A renewable hybrid system coupled to a reverse osmosis desalination unit in southern Tunisia is studied. The hybrid system includes a photovoltaic generator, a wind turbine, a fuel cell and an electrolyzer. To allow a real penetration of intermittent energy sources and to satisfy the fresh water needs, a new power management algorithm allowing the control of the energy flow between the system components is developed. Two sub-algorithms are incorporated in this algorithm. These two sub-algorithms identify the production lines number operating at a pre-defined time interval and adjust the consumed power by the desalination unit. Simulation results are carried out over one year and present the different parameters describing the behavior of the system. These results demonstrate the feasibility and the efficiency of the used control strategy and the performance of the hybrid system.

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