Energy storage systems for a long time have been utilized in many forms and applications. Today's energy storage technologies are used to achieve electric power systems of higher reliability and to contribute to the broader use of renewable energy. Wind power appears to be one of the most perspective and widespread renewable energy sources. Because of unregulated energy generation of wind generators, with the wind speed fluctuating, the output too is fluctuating, i.e. at some instances energy overflow and deficiency will appear (Fig. 1) [1].
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