Water and Energy International

Large scale battery storage systems are becoming increasingly relevant for the Indian power system because of the increasing share of Variable Renewable Energy (VRE) based power generation capacity connecting to the grid. Battery Energy Storage Systems (BESS) connected to the grid along with a renewable energy sources can also be deployed for frequency control along with other main applications. The fast charging and discharging capability of BESS helps to ride through grid frequency variation during contingencies in the grid thereby improving the grid stability. This paper presents a case study, demonstrating the application of large-scale energy storage helping faster recovery of the system frequency during large disturbances. The BESS performance was evaluated considering frequency response and active power control mode for large generation and load tripping contingencies. Investigations revealed that BESS helps in improving the frequency response i.e. frequency rise/dip, response time and steady state frequency.