Amna Zainab Memon, A. Z. M. “TO DESIGN THE PI CONTROLLER FOR ENHANCEMENT OF PERFORMANCE OF HYBIRD POWER GENERATION SYSTEM”. International Journal of Electrical Engineering &Amp; Emerging Technology, vol. 5, no. 1, June 2022, pp. 21-24, http://ijeeet.com/index.php/ijeeet/article/view/109.