Scholarly Publication

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Browsing Scholarly Publication by Author "Adesina, L. M"

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    Contingency Assessment of Medium Voltage Distribution System
    (Department of Chemical Engineering, Faculty of Engineering, University of Benin, Benin., 2022-06-30) Adesina, L. M
    A power distribution network is simply an interconnection of 33/11 kV power transformers, network in-feeds, distribution station buses, and loads. The security of such a system is of great consideration in power utilities. Thus, contingency analysis is often used to determine the security of such systems. Several methods used in analyzing power system security include linear programming (LP), least squares (LS), decision trees (DTs), artificial neural networks (ANN), etc. These methods were observed from the literature to take a long computational period. Therefore, this paper presents a contingency assessment of medium voltage distribution networks using the Newton Raphson (NR) technique of NEPLAN software. The approach involves carrying out of power flow analysis of the case study network. This analysis considered four scenarios; base case, case 2, case 3, and case 4 which are respectively defined as the system operating under normal conditions, abnormal operating conditions without contingency, N-1 contingency, and N-2 contingency respectively. The results of the four cases show that contingency has negative effects on power equipment and customers. The details of these results are presented. This contingency analysis thus provides the reliability evaluation of the network while solutions to problems emanating due to contingencies are solved by utility companies for revenue improvement.
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    Enhancement of the Nigerian National Grid Performance with a FACT Compensator
    (Department of Chemical Engineering, Faculty of Engineering, University of Benin, Benin., 2022-12-30) Ogunbiyi, O; Adesina, L. M; Ugwute, F. O; Thomas, C. T
    The Nigerian grid is faced with loss of lines and system collapse due to overloads, under-loads, and inadequate reactive power at the buses. Analysis of the power flow supported by the static voltage stability condition of the system provides an insight to the system performance indicators like voltage profile, power flows, and losses. Voltage control and power loss reduction strategies are still based on mechanical methods such as synchronous generators/condensers, tap changing of transformers, switching of shunt reactors and capacitor banks, switching of transmission lines, generating unit scheduling, and manual load shedding. However, a flexible alternating current transmission system (FACT) such as the static VAR compensator offers flexible and fast control of power system operations unlike the mechanically switched devices which are restricted by wear and tear and slow response. Hence this work demonstrates the use of static voltage analysis in seeking the optimal placement of the static volt-ampere reactance (VAR) compensator called (SVC) on the power system. This idea was tested using the transmission Company of Nigeria (TCN) 330 kV-bus system that was modeled and analyzed using NEPLAN software and the results showed substantial improvement in the voltage profiles and loss reduction. Simulations of the peak condition showed that 9 stations violated the set limits. It is recommended that FACTS devices be optimally located at Sakete (6°44′11″N 2°39′29″E) bus bars for effective transmission of electric power on the grid.
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    Reliability Indices of Electric Power Distribution System in Ilorin, Nigeria
    (Department of Chemical Engineering, Faculty of Engineering, University of Benin, Benin, 2020-06-30) Ogunbiyi, O; Akomolafe, T; Adesina, L. M
    The failure probability and epileptic power supply is a pointer to the reality that there is a need for reliability studies and fault evaluation of the electric power system in Nigeria. The recent blackout faced in the country has paralyzed many activities and has destroyed many industrial processes. Therefore, it is worth considering reliability assessments as it provides an opportunity to incorporate the cost or losses incurred by the utility customer as a result of a power failure and this must be considered in planning and operating practices. The reliability assessment and estimation of indices were carried out on selected 11 kV injection substations' feeders in Ilorin, Nigeria. Using the analytical method and network reduction technique, the substation reliability was analyzed based on recorded outage data. Results show the low level of reliability of power supply to customers on the feeder, the failure rate is quite on the high side and a low system average interruption frequency index was recorded on most feeders. The overall system availability shows that the system needs improvement and quick response to network failure.
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    Sustainability Assessment of a Standalone Solar Microgrid for Optimal Operation.
    (the School of Infrastructure, Process Engineering and Technology (SIPET) and School of Electrical Engineering and Technology (SEET), Federal University of Technology, Minna, Nigeria, 2024-06-01) Ogunbiyi, O; Adesina, L. M; Daniel, I. M
    The nonlinear characteristics of output current and power in a photovoltaic source present challenges in establishing operating curves under various conditions. Existing models inadequately assess performance across all model parameters and series-parallel combinations. This study evaluates the performance of the solar power source at Kwara State University, Malete, Nigeria for optimal operation. Using the Sims cape library in MATLAB Simulink, the microgrid's basic components—photovoltaic source, inverter, and load—were modeled to examine operational characteristics under different conditions. Simulation results revealed the effects of solar irradiation and temperature on the photovoltaic source. The study also assessed the impact of maximum power point tracking control as the chosen control mechanism. Findings showed that the power source's performance falls short of simulated generation levels, suggesting areas for system improvement. The model not only serves as a performance analysis tool and microgrid capacity evaluation method but also lays the groundwork for overall system enhancement