Abstract-Static Synchronous Compensator (STATCOM) is one
of the typical FACTS device which is used to improve the voltage
profile and transient stability in power system by damping the
low frequency oscillation in it. This paper presents a self tuning
PI controller for STATCOM in which the PI controller gains are
adopted with the system load impedance by Back Propagation
Algorithm. In order to overcome the main drawback of Back
Propagation Algorithm as it has slow convergence speed, A novel
Bats Echolocation Algorithm is used to improve its speed. To
demonstrate the effectiveness of the proposed controller, The
Simulation model was realized and the simulation results are
presented for different loading conditions. Results are compared
with the fixed gain PI controller and Particle Swarm
Optimization (PSO) based self tuning PI controllers.
Keywords - Static Synchronous Compensator, FACTS, Self
Tuning PI Controller, Back Propagation Algorithm, particle
Swarm Optimization and Bats Echolocation Algorithm.