Grid Connected Battery Energy Storage System (BESS)

Battery Energy Storage System (BESS)
Battery Energy Storage System (BESS) is an important technology option for reliably integrating a large proportion of VRE into large power grids. A number of countries are evaluating BESS as part of their RE strategies. In India, energy storage has been the subject of study by a technical committee and task force constituted by the Ministry of Power (Large Scale Integration of Renewable Energy), and by Central Electricity Regulatory Commission (Staff paper – “Introduction of Electricity Storage System in India”, in January 2017). These studies have recommended appropriate policy and regulations to promote the storage deployment by relevant stakeholders.

One of the pilots implemented under USAID’s Greening the Grid (GTG)-RISE Initiative is on the value of BESS to support integration of RE. Since, BESS’ overall economic value is yet to be established, a pilot analyzing techno-economic benefits of multiple use cases, supported by GTG-RISE’s national and international experts, will help develop a scalable roadmap for adoption in India. Other outcomes would include interconnection standards for grid-connected BESS and estimation of the systemic value of storage in the Indian power system, which will feed into policies and regulations to support deployment of BESS.

This pilot will test the technical and economic effectiveness of grid-connected BESS in providing dynamic frequency regulation and other ancillary services; capacity firming and energy time shift of VRE generators, peak shaving and load following; and dynamic reactive compensation and voltage support. The pilot shall also be crucial in providing inputs to CEA and the Bureau of Indian Standards (BIS) to finalize standards for BESS grid interconnection. Power Grid Corporation of India Limited (PGCIL) has designed, tendered and awarded three packages for installing BESS at its grid sub-station in Puducherry. USAID’s GTG-RISE Initiative is building upon the Puducherry BESS pilot facility by collaborating with PGCIL to leverage its investments, enhance the pilot’s coverage, and test different functionalities.

PGCIL has already deployed two BESS installations in the Puducherry facility. GTG-RISE has entered into an MoU with PGCIL for carrying out various grid-level applications connected to the BESS. The detailed project report defines scope of the pilot, which requires actual scenario and field data to develop the algorithm for enhancing the capability of the BESS units at the PGCIL Puducherry site. As part of the pilot development, the GTG-RISE team examined the existing control logics and the enhancement needed at different level (hardware/software) for the proposed applications. The selection process for the grantees is completed and the pilot implementation has been commenced.