1 Simultaneous Coordinated Design of PSS and SVC controllers using HBA for Damping Power System Oscillations Abolfazl Jalilvand ajalilvand@znu.ac.ir Reza Noroozian noroozian@znu.ac.ir Peyman Farhang p.farhang@znu.ac.ir Javad Gholinezhad Javad.gholinezhad@gmail.com Electrical Engineering Department, Zanjan University, Iran Keywords: SVC, output feedback, PI controller, PSS, HBA Abstract Static Var Compensator (SVC) is one of the shunt connected FACTS devices, improves the network stability, limiting the low frequency oscillations, etc. Power System Stabilizer (PSS) has an effective role to damping oscillation, too. This paper focuses on simultaneous coordinated design of SVC and PSS with controllers in single-machine infinite-bus power system where the PSS and SVC do not have the same controllers. SVC has the output feedback controller and PSS has a PI controller. The both of SVC and PSS have been used to improve the damping of power system oscillations. The coefficients of SVC and PSS controllers have been optimized by Honey Bee algorithm (HBA). The equations that describe the proposed system have been linearized, then the system with proposed controllers has been simulated for the special disturbance and the dynamic responses of generator have been represented. 1. Introduction Today’s power grids are driven closer to their transfer capacities due to the increased consumption and power transfers, endangering the security of the system. On the other hand, FACTS devices are a powerful technology that can solve many outstanding problems in power systems. They provide the opportunity to influence power flows and voltages and therefore are able to enhance the system security, e.g. by improving the voltage profile or increasing the transfer capacity of a system without the need of new lines [1]. Typically, FACTS devices are divided into three categories: shunt-connected, series- connected and a combination of both [2]. FACTS devices are being presently employed for various applications, as follows: • Increasing power transmission capacity of existing lines • Improving the steady state and dynamic stability limits • Improving damping of different types of power oscillation • Improving voltage stability [3]. Static Var Compensator (SVC) is one of the key elements in the power system that provides the opportunity to improve power quality and reliability due to its fast response. SVC has the functional capability to handle 10-E-PSS-1866