Controller Design of Shunt FACTS Devices for Power System Stability Improvement Using PSO

The coordinated design problem of SVC(Static Var Compensator) based controller with multiple Power system stabilizers (PSS) is formulated as an optimization problem and optimal controller parameters are obtained using Particle Swarm Optimization (PSO). A two-area test system is used to show the effectiveness of the proposed approach for determining the controller parameters for power system stability improvement. Tuning of the PID controller of shunt FACTS devices for improving the performance of the power system. The performance of two parallel FACTS devices-the SVC and STATCOM has been examined in terms of their ability to provide damping to the power system. The outputs of PID controllers have been used to modulate the thyristor firing angle signal. The nonlinear simulation results show that SVC improves the transient stability and coordinated design of SVC-based controller and PSSs improve greatly the system damping. Finally, the coordinated design problem is extended to a two-area system and the results show that the inter-area and local modes of oscillations are well damped with the proposed PSO-optimized controllers. The simulation of single machine infinite system with and without controller has been developed. The simulation results of the controller tuning by conventional and PSO approach has been presented. The PSO method for tuning the gains/parameters of the PID controller has a small oscillations and fast response for SVC-PI controller than other controller and tuning methods. PSO technique is applied to determine the controller parameters of SVC. The coordinated design of SVC-based controller and PSSs using PSO technique, improve greatly the system stability by damping out the power system oscillations quickly, under severe and small disturbance conditions. The performance of the power system has been improved significantly by modulating the SVC bus voltage following the disturbance and the damping has been improved considerably.