This paper presents a new stochastic optimization technique for tuning conventional PI controller parameters of a static var compensator (SVC) which controls a synchronous machine. As a type of Flexible AC Transmission Systems (FACTS) device, SVC is designed and implemented to improve the damping of a synchronous generator. Computational intelligence technique based PI controller using SVC is implemented in this study. The study involves the development of PI controller for SVC placement, while computational intelligence technique is used to optimize the values of proportional gain, K P and interval gain, K I parameters of PI controller. Validation with respect to eigenvalues determination and synchronizing and damping torque coefficients (K S and K D ) value confirmed that the proposed technique is effective to improve the angle stability problem.