Abstract
Power System Stabilizers (PSSs) are utilized to improve the stability of electrical networks and provide additional damping to reduce electromechanical oscillations. PSS is developed to cope with different oscillation modes, such as global, local, and inter-area modes. Several PSS designs have been discussed in the literature, including single input, dual-input and Multi-Band (MB) PSS. In this research, different PSSs designs (PSS1A, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$P$</tex> SS3B, and MB-PSS4B) are investigated, and a four-machine system is considered with two areas and modeled using MATLAB/Simulink. The results indicate that the performance of optimized MB-PSS4B is better than PSS1A and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$P$</tex> SS3B where the settling time of power angle is reduced. The settling time decreased to 4.24 s when the OMB-PSS4B is used. Moreover, there is a small reduction in the peak power angle with the utilization of OMB-PSS4B.
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