Power Transient Stability Assessment of the Benin-Onitsha-Alaoji 330 kV Transmission Line as a Case Study Using a Matlab/Simulink Model

Abstract

Rereloluwa Victor Alimi, Thomas Kokumo Yesufu and Adefolahan Rufus Omoloju

Voltage collapse has become a recurring challenge in the Nigerian National Grid (NNG), primarily due to island formation caused by the switching out of critical buses. This paper evaluates the stability of the NNG with a focus on a critical transmission line that could lead to islanding following a fault occurrence. A MATLAB/SIMULINK model is developed to analyze both the steady-state and dynamic behavior of a critical bus within the network with the use of power systems stabilizer (Multiband precisely) designed by [6]. Simulations are conducted under various fault conditions, and the results are analyzed. Findings reveal that faults along transmission lines result in high reactive power flow and excessive current, which contribute to system instability. Additionally, the simulation results show non- sinusoidal waveforms, indicating the need for a significant level of compensation at the studied bus. The study specifically examines the Benin bus within the Benin–Onitsha–Alaoji 330 kV transmission corridor, given its strategic role in grid stability. The insights from this research highlight the importance of improving system protection, enhancing compensation strategies, and reinforcing critical transmission corridors to mitigate voltage collapse risks in the NNG.

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