Transformation of energy structure is a serious problem for countries all around the world. China is rich in renewable energy but penetration of high proportion of renewable energy poses a major challenge to the safe operation of power grid. Energy storage, as an effective way to coordinate new energy sources, may breakthe characteristics of "ready-to-use" in electricity and achieveefficient utilization of energy. In terms of large-scale energy storage, compressed air energy storage has gradually become a research hotspot because of its clean and low cost characteristics. In 2018, compressed air energy storage stepped forward to demonstration project and commercialization. This paper reviews the hot topics in the field of compressed air energy storage in 2018, and summarizes and analyzes the outstanding advances in such technologies as multi-energy complementarity, liquefied compressed air, salt cavern gas storage, cyclic temperature control and synergistic hydroelectric power generation.

compressed air energy storage  /  multi-energy complementary  /  salt cavern  /  liquefied compressed air