The integration of renewable energy

such as PV and wind power

has exerted great impacts on the power system with its rapid development. If the corresponding energy storage system is configured

the power system could be able to hold a higher proportion of renewable energy. Focusing on energy storage application for the output fluctuation mitigation of renewable energy

this paper first analyses the reason for renewable energy power fluctuation mitigation from the four aspects of frequency

unit ramp

low frequency oscillation and cascading failure. In addition

the fluctuation rate standard of grid-connected renewable energy

the energy storage type and the mitigation topology are introduced. Then a summary and analysis on mitigation strategy and hybrid energy storage allocation strategy are presented. Finally

the demonstration application and development trend of energy storage are analyzed to provide reference for the promotion of energy storage in renewable energy.