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Abstract
The present Nigerian transmission network is faced with the difficulty of evacuating and dispatching reliable and quality electricity supply and simultaneously maintaining an operational standard of security to prevent any collapses. Therefore, this study developed a novel technique to optimize electrical current flow to provide in-depth research and analysis of current flowing in the transmission network circuit prone to danger during short-circuit faults. The research methodology involved the generation of unbalanced short-circuit calculations at every single node of the three-phase network using the symmetrical component method. Numerical simulation of different types of unbalanced short-circuit fault into the entire 330kV transmission network using unbalanced fault algorithms written in a flexible MATLAB program environment is also performed on every bus. The influence of these short-circuit faults is examined on the generated spectrum of line current magnitude. This study then generates a series of unbalanced current circuit and line losses analysis that unveils the different scenarios regarding existing network performance. The method adopted is promising. It established the most critical lines (about 20) with high unbalanced current magnitudes and high line losses during the disturbance. Based on the result analysis, four (quad) bundles of conductors is designed as a proposed modification to the upgrade of all critical double circuit lines and the conversion of single critical lines on the 330kV transmission network to improve the power transfer capability and also meet the future transmission network development plan. Furthermore, recommendations that are considered desirable in this study are proffered to ensure acceptable power quality and security in the network.
Highlights
The rapid growth of the world population has increased energy demand significantly
Various aspects of faulted bus simulations begin from Kainji bus one and end at Gombe bus twenty-eight for each of the 33-line currents are generated
This study developed a novel technique that provides insight into the current quantity occurring in the thirty-three (33) branches of the Nigerian 330kV transmission network when subjected to various aspects of asymmetrical faults at twenty-eight (28 buses) different locations
Summary
The rapid growth of the world population has increased energy demand significantly. It has become essential to operating energy delivered to transmission lines at maximum efficiency [1]. The annual technical energy losses on the 330kV power line for 2015 as estimated by ref. There is a need to increase the 330-kV Nigerian transmission network's efficiency to successfully and efficiently transmit electricity to all parts of the country. Generation, transmission, and distribution infrastructures must remain balanced in the entire network for the consumer to have access to a reliable and adequate electric power supply. The privatization of the previously government-owned power generation and distribution companies has failed and did not yield the expected result of increased generation and delivering more power at distribution [11, 12, 13]. The privatized system's success still depends on the transmission system's efficacy, which reveals that if the generation sector is to run at total production, the Nigeria 330kV transmission grid will not have the capacity to evacuate the generated power [14]
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