Abdulkareem Ademola, Adesanya A, Agbetuyi A F, Alayande A S
Department of Electrical and Information Engineering, Covenant University, Nigeria.
Department of Electrical and Electronics Engineering, University of Lagos, Nigeria.
Heliyon. 2021 Jul 15;7(7):e07563. doi: 10.1016/j.heliyon.2021.e07563. eCollection 2021 Jul.
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.
当前尼日利亚的输电网络面临着诸多困难，既要疏散和调配可靠且优质的电力供应，又要同时维持安全的运行标准以防止任何崩溃情况发生。因此，本研究开发了一种新颖的技术来优化电流流动，以便对在短路故障期间容易出现危险的输电网络电路中的电流进行深入研究和分析。研究方法包括使用对称分量法在三相网络的每个节点上进行不平衡短路计算。还在每个母线处使用在灵活的MATLAB程序环境中编写的不平衡故障算法，对整个330kV输电网络进行不同类型不平衡短路故障的数值模拟。研究这些短路故障对所产生的线路电流幅值频谱的影响。本研究随后生成了一系列不平衡电流电路和线路损耗分析，揭示了有关现有网络性能的不同情况。所采用的方法很有前景。它确定了在干扰期间具有高不平衡电流幅值和高线损的最关键线路（约20条）。基于结果分析，设计了四（四）束导线作为对330kV输电网络上所有关键双回线路升级以及将单关键线路转换的建议修改方案，以提高输电能力并满足未来输电网络发展规划。此外，本研究提出了一些被认为是可取的建议，以确保网络中可接受的电能质量和安全性。
