POWER-GEN Asia 2018

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Application of Energy Storage to Improve the Grid Performance – Case Study (Room Garuda 9, 1st Floor)

This paper presents a case study for a 1000 MW Integrated Wind, Solar and Energy Storage hybrid plant planned in Andhra Pradesh in India demonstrating the supplementary application of Battery Energy Storage System (BESS) for improving the transient stability of the grid. Although improvement in frequency response is not the primary function of Energy Storage, considering the availability of power margin, the fast charging and discharging capability of energy storage helps to faster recovery of the system frequency during large disturbances, thereby improving the transient stability. The Andhra Pradesh state Grid was modeled in detail including the interconnections to other regions represented as equivalent source or sink. The wind, solar and energy storage were modeled with state of the art modern controls. The BESS performance was evaluated considering frequency regulation and active power control mode for large generation and load tripping contingencies. Investigations reveal that BESS helps in improving the frequency response i.e. frequency rise/dip, response time and steady state frequency. It also helps in arresting the “back Swing” in frequency in case of excessive load shedding carried out by UFLS for the event of large generation loss, thereby improving the reliability of the system.