The integration of intermittent and volatile renewable energy resources requires increased flexibility badly in the operation and planning of the grid. Energy storage together with storage-like loads, which are collectively called generalized energy storage, performed well in terms of provide flexibility. This paper provides classification of various generalized energy storage in terms of different level. More importantly, key technologies of optimal configuration are proposed, including characteristic analysis, modeling, uncertainty analysis, optimization, economic analysis, and value promotion. Besides, the current research status, technical difficulties, and future research directions are involved in each part. Finally, through conclusion and prospect, helpful suggestions are put forward for the related research in the future.
Keywords generalized energy storage, configuration, optimization, key technology