Research on Application of Energy Storage System to Three Defense Lines of Frequency

With the continuous development of UHVDC transmission and renewable energy power generation, large number of synchronous generators have been replaced, and the risk of transient frequency security after faults has increased. Electrochemical energy storage is developed as a flexible control resource. Based on the fast power regulation characteristics, the function of energy storage in the prevention, emergency, and correction control of frequency stability for three defense lines is analyzed. The technical points of capacity allocation for electrochemical energy storage to support transient frequency security are discussed. Meanwhile, this paper researches the optimal configuration of energy storage adapting to multiple application scenarios and optimal operation modes of energy storage power stations.