An overview of energy storage utilization in smart city grid integrated with large scale renewable energies

Smart grid provides electrical energy for smart city, and energy storage technologies are indispensable part of smart grid, especially in which integrated with large scale renewable energies. In this context, this paper presents an overview of energy storage utilization in smart city grid integrated with large scale renewable energies. Among them, nine kinds of typical energy storage technologies: pumped hydro storage, compressed air energy storage, flywheel energy storage, super capacitor energy storage, superconducting magnetic energy storage, sodium sulphur battery, lithium-ion battery, polysulphide-bromide flow battery, thermal energy storage, are introduced. Besides, the main characteristics parameters and the advantages and disadvantages of these energy storage technologies are summarized. Finally, based on these studies, a discussion of future researches is given.