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Integration of renewable sources in electrical networks has increased dramatically in recent years. However, the power supplied by renewable energy sources is not as secure and easy to adjust to changes in demand, as the power supplied by traditional power systems. As a result, storage devices are also integrated into the electrical network in order to ensure reliability and quality in the performance of the power system. This paper presents the current state of development of various storage technologies proposed for use in electric power systems. Thus, characteristic expressions, specific and comparative data (in technical and economic terms) are shown.

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Abstract.Increasing the efficiency of energy conversion systems is a relevant aspect to decrease the oil dependence and to minimize environmental impact. Considering the inherent characteristics of the PEM fuel cells, this paper proposes a control algorithm for a microgrid consisting of two fuel cells, in order to improve its energy efficiency. To do this, hardware responsible for managing the microgrid has been designed and implemented and the proposed control algorithm has been applied. Various tests have been performed on the microgrid, analysing its behaviour in each case.