Transient Stability Improvement of Power System using Power System Stabilizer Integrated with Excitation System

Nowadays, there is an increased concern for stability improvement in modern electrical systems, especially due to the use of distributed generation into the grids. Stability of power system is one of the main challenges to improve the power system efficiency. A Power System Stabilizer (PSS) is a cost-effective controller and efficient device to increase the stability and reliability of power systems. In this paper, the transient stability of IEEE 9-bus system is improved with the integration of excitation system and PSS. The relative power angle is considered to evaluate the transient stability. The simulation results show that the existing system has oscillated. However, when the system is integrated with the exciter ST1A and PSS1A, the peak power angle decreases from 132.1° to 103.7°, and the settling time is 5.53 s. Additionally, the speed deviation is improved when PSS connected to ST1A.