A Genetic Algorithms approach to design an optimal PI controller for Static Var Compensator

A Static Var Compensator (SVC) is one type of Flexible AC Transmission Systems (FACTS) device, used for shunt compensation to maintain voltage magnitude. Additional control functions can be to enhance transient stability and restrain oscillations. The application this paper is concerned with is the damping of oscillations of a synchronous generator as well as to control the system voltage. The Proportional Integral (PI) controller parameters of the SVC are of fundamental importance in ensuring it preforms adequately. This paper presents a systematic approach for PI controller design of a SVC using Genetic Algorithm (GA). To verify the robustness of the proposed method, Genetic Algorithm Proportional Integral (GA-PI) controller design, the dynamic responses of generator (speed deviation and terminal voltage) due to power fluctuation and three-phase fault under heavy, normal and light loading conditions is considered. The GA-PI controller design results in improved stability of single machine connected to infinite busbar with SVC system over conventional PI controller or without controller.