S.Radha Krishna Reddy, et al. “A Novel On Coordinated Voltage Control Scheme For Seig-Based Wind Park Utilizing Substation Statcom And Ultc Transformer”. Global Journals of Research in Engineering, vol. 12, no. F5, Mar. 2012, pp. 23-28, https://engineeringresearch.org/index.php/GJRE/article/view/614.