DYNAMIC STABILITY ASSESSMENT AND ENHANCEMENT IN THE NIGERIAN 330 KV, 36-BUS ELECTRICITY GRID NETWORK VIA COMBINED USE OF GOVERNOR AND POWER SYSTEM STABILIZER
Abstract
Small signal or dynamic instability is one of the major challenges experienced in the operation of power systems, which often results in the violation of acceptable voltage and frequency limits. Therefore, this study assessed small signal stability on a power system via an eigenvalues approach. Non-linear differential-algebraic equations describing the dynamic characteristics of the power system were developed. These equations were linearized using Taylor’s series expansion. The computational algorithm with eigenvalues was developed considering the Nigerian 330 kV electricity grid comprising 13 generators and 36 busses as test system. The qualitative stability state of the system was determined by obtaining the eigenvalues of the generator rotor angle (????) parameters with and without control schemes implemented via the governor (G) and the governor with the power system stabilizer (G + PSS). The results showed that ???? was in stable state for all 13 generators in the network with eigenvalues obtained having negative real parts with and without controllers; although a better system stability level was obtained with G + PSS compared to G because the real part of the obtained eigenvalues was much lower in value. This result clearly revealed that G + PSS exhibited superiority over G in improving the small signal stability of the considered power network. The use of eigenvalues produced a simplified analysis of the small signal stability of a power system network where the combined effect of the governor and power system stabilizer offered better stability enhancement
Keywords:
Small signal or dynamic instability Eigenvalues, Governor, Power System Stabilizer,, Rotor AngleDownloads
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Copyright (c) 2024 Rufus Akinnusimi Jokojeje, Isaiah Adediji Adejumobi, Oluwaseun Ibrahim Adebisi, Idowu Ademola Osinuga
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