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As distributed power sources seem to become increasingly popular in the near future, power electronics should be able to provide significant advantages in processing power from renewable energy sources using fast response and autonomous control. Fuel cells, photovoltaic devices and storage batteries sources produce a significant power in hybrid power structure. In this paper, the uninterruptible power source part of this multisource charger is especially considered in the point of view of its dynamic modeling, its control strategy and the energy management of the whole device. Simulation results are presented and validated by experimentation.