Corresponding author E-mail: fatmaelkashef@yahoo.com Received September, 1, 2021, received in revised form, October, 5, 2021, accepted October, 7, 2021. (ASWJST 2021/ printed ISSN: 2735-3087 and on-line ISSN: 2735-3095) https://journals.aswu.edu.eg/stjournal Aswan University Journal of Science and Technology Volume 1, issue 2 The Impact of Optimized PID Controller Based SVC on Power systems Stability Enhancement Fatma Elzhraa Elkashefy, Gaber Magdy, Ahmed Ewais Electrical Engineering Department, Faculty of Energy Engineering, Aswan University, Aswan, Egypt Abstract The stability is the most important goal in any electrical network, and the control of this network is a part of the stability organization. This article presents application of three optimization algorithms, which are Henry Gas Solubility Optimization, Grey Wolf Optimization, and Ant Lion Optimization, to obtain the PID controller parameters for Static var compensator SVC connected to Single Machine Infinite Bus (SMIB) system. The suggested optimization techniques were used to choose the most accurate PID parameters to enhance the system stability. And then applied the proposed optimization algorithm which gives the best value of J-obj in the PID controller variables with the Static VAR Compensator’s (SVC) variables to get the most suitable values for them which leads to more and faster stability than without the SVC then it compared with the Power System Stabilizer (PSS). So that the importance of installing optimized SVC based PID controller is evident. Keywords: PID Controller; Optimization techniques; SVC; Power systems stability NOMENCLATURE ALO Ant Lion Optimization GWO Grey Wolf Optimization HGSO Henry Gas Solubility Optimization J_obj objective function   Static VAR Compensator gain   differential gain of PID controller   integral gain of PID controller   proportional gain of PID controller PSS Power system stabilizer SMIB single machine infinite bus SVC Static VAR Compensator   SVC time constant Introduction To enhance the stability for the SMIB in the electrical networks there are a lot of devices are studied one of them is the Flexible Alternating Current Transmission System (FACTS) technology, based on modern powerful disturbances [1-7]. FACTS technology, based on modern powerful semiconductor devices, enables the transmission system to improve its efficiency by regulating the power flow, enlarging the loading capability, increasing the system security and providing greater flexibility, just to enumerate a few benefits. Particularly, FACTS compensators commanded through proficient control algorithms allow enhancing the stability and transfer capability of present and new transmission lines.