Energy Storage Systems With higher amount of fluctuating energy generation within a power grid new concepts are required to maintain a reliable energy supply which is essential for the economy. Grid enlargement is always an option; however a long time process is necessary with a lot of political implications. Electrical energy storages offer here an alternative. This paper gives an overview about possible energy storage concepts for electrical energy. Several operational concepts will be discussed and the suitability for each technology will be shown.
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