Inter-Area and Intra-Area Oscillation Damping for a Multi-machine Power System Integrated with UPFC Using DIW -PSO Based PID Controller

Inter-area and intra-area oscillations with multiple frequencies components (modes) are very often occurred in power system. To enhance the stability and performance, it is indispensable to provide adequate controller and compensating devices. This paper investigates to arrive at an approach based on Unified Power Flow Controller (UPFC) to damp these fluctuations with better settling time and lesser overshoot in quick span of time duration. Optimal Factional PI (FPI) control is applied to control the UPFC parameters for achieving better control in comparison to conventional PID controller. As the performance of the FPI mostly depends on its parameters, the optimal value is found out by applying particle swarm optimization. Computational result are presented to justify the proposed approach capability to damp the inter-area and intra-area oscillations effectively. The comparative results are also provided with conventional PI to show the enhanced performance of the PSO-FPI based approach.