Saravanan, K., D. L. . Berhanu, and G. Z. . Somano. “UPFC Integrated With Battery Energy Storage Systems for Stability Improvement”. Asian Journal of Energy Transformation and Conservation, vol. 1, no. 2, Dec. 2014, pp. 76-86, doi:10.18488/journal.81/2014.1.2/81.2.76.86.