Browsing by Author "L.M. Adesina"

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    Harmonic Analysis in a 33-kV Distribution Network: A Case Study of Island Business District
    (IEEE-Africa, 2015-06-01) L.M. Adesina; O.A. Fakolujo
    Distribution Line Network harmonic investigation has become an important issue in electric power systems since the increased use of power electronic devices and equipment sensitive to harmonics, which in turn, has increased the number of adverse harmonic-related events. The power quality problem and the means of keeping it under control is a growing concern. Due to the connection of nonlinear loads in a 33kV distribution network, power quality issues have been raised and have resulted in widespread waveform distortion. This paper makes use of the Busbar voltage solutions obtained from a power flow study on the Eko Electricity Distribution Company’s 33kV network and they are used as the base data for the harmonic analysis. A distribution line model was formulated. MATLAB/Simulink was used to simulate this modeled network for each distribution line of the power system network considered. This simulation was achieved through the application of sending and receiving end busbar voltages already obtained from the power flow study. The harmonics observed on each distribution line at various scenarios of load/feeder restoration and their characteristic impedance magnitudes/frequency are all presented. Necessary discussions on the harmonic results are also presented.
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    Harmonic Mitigation on a 33kV Distribution Line using Passive Filters
    (IEEE-Africa, 2015-09-01) L.M. Adesina; O.A. Fakolujo
    The use of modern power electronic devices in circuits has made ‘power quality’ an increasingly important factor in the planning of both transmission and distribution systems. These devices are nonlinear loads such as office equipment like Central Processing Units (CPU), Plotters, etc., and most electronic home appliances such as Television, Video players, etc., that generate distorted harmonic currents and voltages, which get injected into the power system and leads to ineffective operation of the system. The Harmonic mitigation scheme is therefore imperative in the design and planning of a power system network. Consequently, this paper presents the control of harmonics in a 33kV Distribution line by using passive filters – a case of RLC and LC filters in both single and cascaded configurations were examined in order to study the net effects of their application in a distribution line. It involves the use of the distribution line (case study) results obtained from previous studies on power flow and harmonic analysis of the overall network that contains the distribution line of the case study. These results serve as source data for this research. Only a distribution line of the network was used as a test case. The harmonic mitigation analysis was carried out using MATLAB/Simulink platform. The simulation results of mitigation harmonics are presented. Conclusions and necessary recommendations for future research are also discussed.
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    Loss Mitigation on Suleja 33kV Network Using STATCOM Device
    (Centre for International Research Development (CIRD) Publications, 2022-04-01) J.K. Ogunjuyigbe; O. Ogunbiyi; L.M. Adesina; S.A. Benson
    The load flow analysis was carried out to establish base voltage at various buses. The buses that have the voltages fall below the prescribed or nominal voltage range between 0.95 and 1.05 p.u. volt are considered as faulty buses. These include bus 1, bus 4 and bus 5 with per unit volts of 1.06, 1.057 and 0.8897p.u respectively. After the incorporation of STATCOM, the p.u. volts at buses 1, 4 and 5 improved to 1.025 p.u., 1.026 p.u. and 1.01 p.u. respectively. The total active power loss without STATCOM is 323.9891MW while that of the reactive power loss 50.07631MVar and the total active power loss with STATCOM is 275.6053MW while that of the reactive power loss is 18.79948MVar. The losses reduced when STATCOM was incorporated into the distribution network. Therefore, the percentage of power system improvement is 17.6% when STATCOM was incorporated.
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    Optimization Analysis of Dual-Mode Renewable Hybrid Power Systems: A Review
    (NIGERIAN JOURNAL OF TECHNOLOGICAL DEVELOPMENT, UNIVERSITY OF ILORIN, 2024-12-08) B.O. Ariyo; L.M. Adesina; A. Musa; O. Ogunbiyi; B.J. Ojuolape; M.O. Balogun
    The escalating threat of global warming necessitates a shift towards clean energy production, with renewable energy sources emerging as a promising solution for sustainable electricity generation. However, the inherent intermittency of renewables requires hybrid systems to maintain reliable electricity. This review explores the optimization of dual-mode renewable hybrid power systems, which operate in both grid-connected and autonomous modes, to address power stability challenges. By analyzing state-of-the-art methodologies, including advancements in control algorithms, architecture sizing, and energy management strategies, this work identifies methods for enhancing system efficiency and cost-effectiveness. Key findings demonstrate that optimized dual-mode systems improve power consistency and operational resilience. The review concludes by outlining a roadmap for future research, highlighting innovations in integration techniques, environmental assessments, and regulatory collaboration as crucial steps toward maximizing the impact of dual-mode systems in achieving global energy sustainability goals.