Hamad Rafa, Adel. “Photovoltaic (PV) Contribution to the Primary Frequency Control”. Solar Energy and Sustainable Development Journal 1, no. 1 (June 30, 2012): 8–17. Accessed May 19, 2024. https://jsesd-ojs.csers.ly/ojs/index.php/jsesd/article/view/102.