. The value of energy storage systems (ESS) to provide fast frequency response has been more and more recognized. Although the development of energy storage technologies has made ESSs technically feasible to be integrated in larger scale with required performance
As a new type of flexible regulatory resource with a bidirectional regulation function [ 3, 4 ], energy storage (ES) has attracted more attention in participation in automatic generation control (AGC). It also has become essential to the future frequency regulation auxiliary service market [ 5 ].
The frequency regulation power optimization framework for multiple resources is proposed. The cost, revenue, and performance indicators of hybrid energy storage during the regulation process are analyzed. The comprehensive efficiency evaluation system of energy storage by evaluating and weighing methods is established.
The frequency regulation can also be achieved in the wind energy system by using the battery storage [ 5] and the battery energy storage can be optimized for controlling the frequency [ 6 ]. The statcom integration with energy storage can give better results [ 7] and this can be achieved in the power system [ 8, 9 ].
Due to the very high penetration of energy systems, there is a need for frequency regulation, hence different control strategies are employed to overcome this problem.
The plan specified development goals for new energy storage in China, by 2025, new energy storage technologies will step into a large-scale development period and meet the conditions for large-scale commercial applications.