Comparison of Power System stabilizers Between Merowe Dam and Dr.Mahmoud Sharif Power Plants

Abstract

Control of excitation system is well known as one of the effective means to enhance the overall stability of electrical power systems. Present day excitation systems predominantly constitute the fast acting AVRs. A high response exciter is beneficial in increasing the synchronizing torque, thus enhancing the transient stability i.e. to hold the generator in synchronism with power system during large transient fault condition. However, it produces a negative damping especially at high values of external system reactance and high generator outputs. Generator excitation controls have been installed and made faster to improve stability. Power system stabilizer(PSS) have been added to the excitation systems to improve the oscillatory instability. It is used to provide a supplementary signal to the excitation system. The basic function of PSS is to extend the stability limit by modulating generator excitation to provide the positive damping torque to power swing modes. In this thesis, a comparison between Merowe Dam and Mahmoud Sharif Power Plant is to be studed bassed on power system stabilizer.