Adegoke Melodi | Federal University of Technology Akure (original) (raw)

Papers by Adegoke Melodi

FUOYE Journal of Engineering and Technology

The distribution system is essential in the provision of electricity for all consumers. However, ... more The distribution system is essential in the provision of electricity for all consumers. However, outages occasioned by faults are a major setback in ensuring a regular supply of electricity to consumers in a populous state like Lagos. This study analyses the outage causes, their cost, energy loss, and duration of outages experienced by electricity consumers in the distribution systems of Lagos State. The fault reports of Eko Electricity Distribution Company (EKEDC) and Ikeja Electricity Distribution Company (IKEDC) were used for the analysis. The analysis revealed that the main causes of outages on the network are transient faults (356.78 occurrences per month) and jumper cuts (352.83 occurrences per month). The average monthly cost impacts of the outages on the network are estimated to be between ₦631m & ₦837m and ₦837m & ₦1.66b for the 11kV and 33kV networks of the State respectively. The average monthly energy lost due to outages on the network for the period under review is sign...

FUOYE Journal of Engineering and Technology

Load data of a Federal Medical Center (FMC) in Nigeria, under prevailing erratic power supply fro... more Load data of a Federal Medical Center (FMC) in Nigeria, under prevailing erratic power supply from Nigeria’s electric power distribution company (DisCo) feeders, were considered to develop model load curve and electricity use values for planning effective electricity use and management. The analytical methods applied include nominal load evaluation for the entire FMC, data acquisition by direct hourly load monitoring for 12 months, diesel fuel consumption observation for power supply during DisCo outages, energy metering, outage events and durations, descriptive statistical evaluations of data. The results obtained and analysed include the following: nominal load, daily load and electricity use models. The results established daily load curve and parameters, such as load factor, daily average power and expected electrical energy consumption model in a typical Nigerian FMC. Model load factor is 0.545, which would be uneconomical especially when using standby generators the whole day ...

FUOYE Journal of Engineering and Technology

This paper analysed empirical system data of nature-induced electrical faults, its variation, and... more This paper analysed empirical system data of nature-induced electrical faults, its variation, and ratings in the distribution networks of Lagos State, Nigeria, which affect the power distribution system infrastructure, end-users of electricity, and the economic development of the distribution companies, consumers, and the nation at large. Fault-based outage data (at installed 11 kV and 33 kV nominal network voltages) were obtained and analysed by natural phenomena (NPs) using relative frequency, seasonal variation, and probabilistic statistics. From obtained results, the following were established: NP-induced electrical faults are prevalent in the distribution systems of Lagos State, and it is more towards or closer to the mainland; vegetation (67%) and birds/snakes (24%) are the most predominant fault-causing NPs in the distribution networks; floods (0.1%) rarely cause electrical faults in these distribution networks despite being a coastal region; and NP-induced electrical faults ...

2022 IEEE Nigeria 4th International Conference on Disruptive Technologies for Sustainable Development (NIGERCON)

Network and Complex Systems, 2013

The use of induction furnaces for steelmaking has grown dramatically in the last decade throughou... more The use of induction furnaces for steelmaking has grown dramatically in the last decade throughout the world. The steel melting process involves the use of large quantities of energy in a short time and in some instances the process causes large decrease in the quality of electric power system to electricity users on the same network. In this paper, a new block for induction furnace was developed using MatLab Simulink software and the effect of induction furnace loads on the steel plant supply network was analyzed in terms of total harmonic distortions of voltage and current, using the developed block. Installation of a commensurate passive filter for distortion reduction was proposed, designed and simulated. The simulation of the installation of the designed passive filter shows that the filter reduced the distortions by approximately 60%, limiting the residual distortions to permissible values. The new block provided proved to be effective in harmonic distortion analysis in the po...

FUOYE Journal of Engineering and Technology

The ability of the power system to deliver to its consumer electrical energy at an expected level... more The ability of the power system to deliver to its consumer electrical energy at an expected level of reliability is correlated with the economic development of a country. The Nigerian power system faces many challenges, varying from overdue infrastructure maintenance, obsolete tools and appliances, insufficient electricity supply, corruption, etc. A gradual shift from manual to smart digital technologies include; smart metering, distributed generation (renewable energy and microgrid), and management using Information and Communication Technology (ICT) tools. In response, research, investments, and upgrade to the power sector are fundamental. This paper discusses and analyses the various smart grid technologies utilised in the Nigerian power system with their effects, impacts, deployment, and integration into the traditional Nigerian power grid. Also discussed are issues and challenges of smart grid deployment and ways of mitigating these challenges.

Owing to low academic productivity in Nigerian public Universities resulting from irregular power... more Owing to low academic productivity in Nigerian public Universities resulting from irregular power supply, this study looked into the obtainable profile of a monocrystalline type of solar panel with the aim of evaluating its applicability as an alternative source of energy for a typical laptop computer common in Nigerian universities, using the Federal University of Technology as a case study. The methods used in carrying out this study includes: obtaining empirical measurement and conversion for the solar illumination and radiation in the premises of the Federal University of Technology, Akure; and modeling of a Photovoltaic (PV) module using Matlab SIMULINK. Using the obtained solar radiation data, sun simulation was carried out on the modeled module, and a profile for number of panels required for work period of the day was obtained. The result shows that for a work period of 9:00am to 4:00pm, (2 x 1m2) panels will be required, which has characteristic knee voltage and power of 15...

International Journal of Electrical and Electronics Engineering, 2015

This study is aimed at designing, fabrication and evaluation of an efficient UPS based on locally... more This study is aimed at designing, fabrication and evaluation of an efficient UPS based on locally obtainable material and conditions, for local application in academic environments. From a load survey, a load of 1.2 kW was obtained for Nigeria academics offices, which lead to the design of a 1.5 kVA UPS. A standard oscillating circuit based on CD4047 was adopted and adapted in the design. By loading requirements, 8 units of IRF250 MOSFETs were evaluated for the design. To improve the reliability (increase time to failure of battery) and effectiveness of the design, a battery charging controller and level detector were evaluated for addition to the design. The oscillatory circuit was tested using oscilloscope, and the open circuit and short circuit tests of the designed transformer for the construction was carried to define its efficiency. From the design, a square waveform of output voltage was obtained. The designed transformer efficiency obtained for the designed UPS is approximately 82%. A comparative technical and costs assessment show that the constructed UPS is cheaper but of less efficiency when compared with the imported 1.5 kVA products available in the Nigerian market

International Journal of Electrical and Computer Engineering (IJECE), 2017

The study aimed to investigate and obtain model values of system unavailability and cost of energ... more The study aimed to investigate and obtain model values of system unavailability and cost of energy not supplied in existing Nigerian township electricity distributions using a robust representative system. Outage data was obtained from system records for analysis using frequency distribution statistics to identify the causes of outages, and the contribution of each cause of outage to the overall system outage. The cost of energy not supplied (CENS) due to faults, was evaluated at a rate of NGN6 per kWHr. An analysis of the results shows that in a distribution feeder (and system) unavailability is mainly due to load shedding arising and faults; feeder unavailability involving load shedding is 0.25, and 0.1 without load shedding. Compared with standard UA value for well managed systems of less than or 0.01, the obtained unavailability values for a feeder show that downtime management was poor, and the corresponding cost – prohibitive. In view of the regular load shedding on the feeder...

Advances in Science and Technology Research Journal, 2015

International Journal of Electrical and Computer Engineering (IJECE), 2017

This paper aimed to model lightning strike events and evaluate its correlation with power outages... more This paper aimed to model lightning strike events and evaluate its correlation with power outages in a Nigerian power distribution system. A specified coastal distribution network of southwest Nigeria was selected as a case study. Zone-specific records of cloud-to-ground lightning strikes for 84 months were obtained from the Nigerian Meteorological Agency (NiMet); records of power outage frequencies and durations for 36 months were obtained at the substations of the selected distribution network. Using numerical statistical analysis techniques, lightning activity in the system area were characterized in relative frequency terms, and correlation statistics were evaluated and analyzed for power outages and lightning events on the 11kV, 33kV, and 132kV voltage levels. An analysis of the results shows that the modelled lightning strike events patterns are closely related but the expected frequencies vary from one zone to another; and there is correlation between lightning strike and pow...

Jurnal Elektronika dan Telekomunikasi, 2021

The rule of thumb dictates that for any country to have a stable and sufficient power supply, the... more The rule of thumb dictates that for any country to have a stable and sufficient power supply, there must be at least a thousand Megawatts of electricity for every one million population. However, many developing countries generate far less than the population demand. Despite not generating enough, enormous electrical power loss, energy theft, and unpaid bills are major problems bedeviling the power distribution companies. A fundamental process in the electricity cycle is energy metering from power generation to distribution and consumption. For decades now, manual (or conventional) energy meters are used to estimate every end-user's energy consumption. But there are lots of setbacks to these meters. These meters were unable to solve the problems of power loss and theft, giving necessity to developing a metering system that will serve as a solution to all issues emanating from the consumer end. The past decade saw many developments of such meters, where all are based on the inter...

AU Journal of Technology, 2014

FUOYE Journal of Engineering and Technology

Outage and complimentary load flow analyses of a selected 33kV primary distribution network in Ug... more Outage and complimentary load flow analyses of a selected 33kV primary distribution network in Ughelli Delta State, Nigeria, were carried out to depict feeder availability obtainable in the country. Outage and load flow analyses were carried out using parametric statistics and Newton-Raphson computation algorithm respectively. The results provide model distribution of monthly feeder availability, contributions of outage factors and normal load flow values. It was concluded that: monthly feeder availability represented using normal probability distribution function of; shows that overcurrent and earth faults contribute to outage duration, taking 5% to 12% of the month outage duration respectively; coupled with significant line losses and weak voltage profile. Recommendations proposed include: replacement of weak or failed elements and insulations in the systems with new and modern ones to mitigate especially earth faults in the short term; planning for immediate increase in system ca...

International Journal of Electrical and Computer Engineering (IJECE)

The abundance of solar energy in Akure, South-West Nigeria and its feasibility as an alternative ... more The abundance of solar energy in Akure, South-West Nigeria and its feasibility as an alternative energy source has been proven. However, cheap, Government subsidized but unreliable grid electricity and high cost of solar equipment are considered the major hindrances to deployment of solar energy for improved power supply and environmental sustainability. An earlier work pointed out realistic pricing of electricity, reduced cost of solar equipment and reduction in solar cell degradation factor as major factors capable of speeding up parity hence, motivating solar energy consumption. It showed that parity is attainable within 14 years. Documented significant improvements in these factors in recent times are the motivations for this review. This review cost-comparatively re-assesses both sources of energy under the prevailing National electricity policy and market realities using simple mathematical and graphical modeling techniques. This is with a view to determining a new timing for ...

The study aimed to investigate and obtain model values of system unavailability and cost of energ... more The study aimed to investigate and obtain model values of system unavailability and cost of energy not supplied in existing Nigerian township electricity distributions using a robust representative system. Outage data was obtained from system records for analysis using frequency distribution statistics to identify the causes of outages, and the contribution of each cause of outage to the overall system outage. The cost of energy not supplied (CENS) due to faults, was evaluated at a rate of NGN6 per kWHr. An analysis of the results shows that in a distribution feeder (and system) unavailability is mainly due to load shedding arising and faults; feeder unavailability involving load shedding is 0.25 and 0.1 without load shedding. Compared with standard UA value for well managed systems of less than or 0.01, the obtained unavailability values for a feeder show that downtime management was poor, and the corresponding cost – prohibitive. In view of the regular load shedding on the feeders and poor downtime management, this study recommends a need to obtain model loadflow perspective of township electricity distribution to ascertain load carrying capacity, and the application of distribution automation system or other effective strategies to mitigate downtime.

Owing to low academic productivity in Nigerian public Universities resulting from irregular power... more Owing to low academic productivity in Nigerian public Universities resulting from irregular power supply, this study looked into the obtainable profile of a monocrystalline type of solar panel with the aim of evaluating its applicability as an alternative source of energy for a typical laptop computer common in Nigerian universities, using the Federal University of Technology as a case study. The methods used in carrying out this study includes: obtaining empirical measurement and conversion for the solar illumination and radiation in the premises of the Federal University of Technology, Akure; and modeling of a Photovoltaic (PV) module using Matlab SIMULINK. Using the obtained solar radiation data, sun simulation was carried out on the modeled module, and a profile for number of panels required for work period of the day was obtained. The result shows that for a work period of 9:00am to 4:00pm, (2×1m^2) panels will be required, which has characteristic knee voltage and power of 15V and 60W respectively

FUOYE Journal of Engineering and Technology

2022 IEEE Nigeria 4th International Conference on Disruptive Technologies for Sustainable Development (NIGERCON)

Network and Complex Systems, 2013

FUOYE Journal of Engineering and Technology

International Journal of Electrical and Electronics Engineering, 2015

International Journal of Electrical and Computer Engineering (IJECE), 2017

Advances in Science and Technology Research Journal, 2015

International Journal of Electrical and Computer Engineering (IJECE), 2017

Jurnal Elektronika dan Telekomunikasi, 2021

AU Journal of Technology, 2014

FUOYE Journal of Engineering and Technology

International Journal of Electrical and Computer Engineering (IJECE)

The study aimed to investigate and obtain model values of system unavailability and cost of energ... more The study aimed to investigate and obtain model values of system unavailability and cost of energy not supplied in existing Nigerian township electricity distributions using a robust representative system. Outage data was obtained from system records for analysis using frequency distribution statistics to identify the causes of outages, and the contribution of each cause of outage to the overall system outage. The cost of energy not supplied (CENS) due to faults, was evaluated at a rate of NGN6 per kWHr. An analysis of the results shows that in a distribution feeder (and system) unavailability is mainly due to load shedding arising and faults; feeder unavailability involving load shedding is 0.25 and 0.1 without load shedding. Compared with standard UA value for well managed systems of less than or 0.01, the obtained unavailability values for a feeder show that downtime management was poor, and the corresponding cost – prohibitive. In view of the regular load shedding on the feeders and poor downtime management, this study recommends a need to obtain model loadflow perspective of township electricity distribution to ascertain load carrying capacity, and the application of distribution automation system or other effective strategies to mitigate downtime.

Owing to low academic productivity in Nigerian public Universities resulting from irregular power... more Owing to low academic productivity in Nigerian public Universities resulting from irregular power supply, this study looked into the obtainable profile of a monocrystalline type of solar panel with the aim of evaluating its applicability as an alternative source of energy for a typical laptop computer common in Nigerian universities, using the Federal University of Technology as a case study. The methods used in carrying out this study includes: obtaining empirical measurement and conversion for the solar illumination and radiation in the premises of the Federal University of Technology, Akure; and modeling of a Photovoltaic (PV) module using Matlab SIMULINK. Using the obtained solar radiation data, sun simulation was carried out on the modeled module, and a profile for number of panels required for work period of the day was obtained. The result shows that for a work period of 9:00am to 4:00pm, (2×1m^2) panels will be required, which has characteristic knee voltage and power of 15V and 60W respectively