Optimized PIDF Controller for Enhancing Stability in Power System with UPFC and Redox Flow Batteries

摘要

In this paper, proportional integral derivative controller with filter (PIDF) is proposed for enhancing power system stability. Initially, the test is carried out using IEEE 57-bus system without physical constraints. The gain of PIDF controller is optimized using firefly optimization algorithm (FOA) and the performance of the proposed PIDF controller is compared with two other optimization techniques namely differential evolution algorithm (DEA) and particle swarm optimization (PSO). To improve the system performance, unified power flow controller (UPFC) is inserted in tie-line with redox flow batteries. Finally, the physical constraints such as generation rate constraints (GRC) and time delay (TD) are included with UPFC and redox flow batteries and the test is carried out by retuning the parameters of the controller. In order to study the system performance, sensitivity analysis has been performed by adjusting the system parameters under different load conditions. The voltage stability analysis has been performed by using Bifurcation analysis. The result shows that the proposed PIDF need not reset for wide variation of system parameters and loading condition.