Browsing by Author "Otuoze, Abdulrahaman"

Now showing 1 - 20 of 23
  • Item
    THE CHALLENGES AND PANACEAS TO POWER DISTRIBUTION LOSSES IN NIGERIA
    (Arid Zone Journal of Engineering, Technology and Environment, 2020) Otuoze, Abdulrahaman; Mohammed, OO; Salisu, S; Abioye, A.O.; Usman, A.M.; Alao, A.R.
    Energy losses in the distribution network and its subsystems have been issues of great concerns in Nigeria’s power sector. For decades, several studies have been conducted on the challenges facing the power sector in Nigeria with most focus directed on the distribution subsystems. The major challenge in the distribution system is the high energy losses which are detrimental to the techno-economic benefits of the power systems. However, details of the distribution system challenges and the probable solutions have not been efficiently presented. In this study, some of these challenges are presented and the potential solutions are proposed. The features of the Nigeria distribution network, the technical and non-technical sources of losses as well as the identified challenges are presented before discussing the potential solutions. The panaceas so provided were from the understanding of some published works and other related materials as well as the in-depth understanding of the authors. This article can serve as a guide for the utilities and stakeholders in the power sector for efficient management operations and improved customer service delivery.
  • Item
    CURRENT STATUS AND OUTLOOK OF RENEWABLE ENERGY DEVELOPMENT IN NIGERIA
    (Nigerian Journal of Technology, 2016-12-29) Otuoze, Abdulrahaman; Akorede, MF; Ibrahim, O; Amuda, SA; Olufeagba, BJ
    Over 80% of the current Nigerian primary energy consumption is met by petroleum. This overdependence on fossil fuels derived from petroleum for local consumption requirements should be a serious source of concern for the country in two ways – depletion of the resources and negative impact on the environment. This paper presents a critical review of the available renewable energy resources in Nigeria, namely; biomass, hydropower, solar and wind energy. It examines the current energy situation in the country and equally discusses the various energy policy documents developed by the government. Using the scenario-based International Atomic Energy Agency models, the projected energy demand and supply structure of the country through 2030 are presented and analysed. Overall, this study shows that Nigeria will overcome her present energy crisis if she explores the abundant renewable energy resources in the country. The data presented in this paper is a crucial eye-opener for relevant government agencies towards developing these energy resources in tackling the present energy crisis in Nigeria.
  • Item
    Design, Specification and Implementation of a Distributed Home Automation System
    (Sciencedirect, 2016-01-01) Otuoze, Abdulrahaman; Abdulrahman, TA; NT, Surajudeen-Bakinde; Isiwekpeni, OH
    This work presents the design and model implementation of a novel home automation system applying the Internet of Things (IoT) technology. It seeks simplified design protocols for developing a robust home automation system to deal with the problems of complexity, multiple incompatible standards and the resulting expenses in the existing systems. The embedded system features the ubiquitous low-cost 32-bit ESP8266 System-on-chip (SoC) module interfaced to some sensors and actuators for interaction in the home. Flexibility in the remote access, operation and management is achieved through HTML5 based intuitive mobile and web GUI applications. Web Application Messaging Protocol (WAMP) is deployed to ensure that individual applications and systems seamlessly communicate with a relatively high level of security using robust web service security protocol. This system offers a cost-effective and efficient solution, because the costs of a dedicated public IP address and a high-end computer are excluded, which are present mostly in other solutions.
  • Item
    Development Of A Cloud-Based Condition Monitoring Scheme For Distribution Transformer Protection
    (Universitas Sriwijaya, Indralaya, Indonesia, 2023-02) Abdullateef, Ayodele Isqeel; Issa, Abdulkabir Olatunji; Sulaiman, Abdullah; Salami, Momoh Jimoh Eyiomika; Otuoze, Abdulrahaman
    Distribution transformers are a necessity to ensure a reliable power supply to consumers and their inability to function properly or even breakdown should be avoided due to the high cost of replacing them. Distribution transformers are large in numbers and randomly distributed in cities and there is a need to accurately monitor their daily/hourly performance. To achieve this, real-time monitoring of the transformer’s health status is proposed rather than the use of the traditional approach involving physical inspection and testing which is slow, tedious and time-consuming. This paper presents a cloud-based monitoring scheme applied to a prototype distribution transformer. A 10kVA, 0.415 kV prototype distribution transformer has been acquired and connected to three residences for data acquisition. A data acquisition system has been developed to monitor and record the parameters of the prototype transformer for 14 days. The parameters, monitored in real-time include load current, phase voltage, transformer oil level, ambient temperature and oil temperature. The acquired real-time data of the transformer is validated with the standard measuring instrument. An algorithm was developed to transmit and log the data to ThinkSpeak cloud server via node MCU (ESP 8266). Results obtained in this study, which can be visualized via the graphical user interface of ThinkSpeak, indicate that the proposed scheme can acquire vital data from the distribution transformers and transmit the information to the monitoring centre.
  • Item
    Development of A Direct Conductive Coupled Multi-Input Phase-Shifted Full-Bridge DC-DC Converter
    (School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru., 2020) Otuoze, Abdulrahaman; Ibrahim, Oladimeji; Yahaya, Nor Zaihar; Saad, Nordin; Hassan, M.D.; Afolayan, Mubarak Akorede; Madugu, Ibrahim; Usman, Ayinde Mohammed
    Hybrid energy system is commonly employed in renewable energy systems to bridge the gap of non-availability of one power source with the others. In this work, a direct conductive electrical circuit connection topology for realizing multiple power source synchronization in the hybrid energy system is proposed. A three-input power sources integration scheme was realized via forward-conduction bidirectional blocking switch which serves input to the common power conversion stage of phase-shifted full-bridge DC-DC converter to boost the synchronized common bus voltage. An average current sharing controller is designed for the multiple parallel power sources to ensure equal load sharing when all the sources operates on the same and different voltage level. In this study, a 3-kW rating hybrid energy system was implemented in Simulink environment to investigate the multiple source integrator, the current sharing capability, and the common power conversion stage performance. The system ensured equal load sharing, allowed individual and simultaneous power transfer from the multiple sources to the load under the same and different operating supply voltage level.
  • Item
    Electricity theft detection framework based on universal prediction algorithm
    (Indonesian Journal of Electrical Engineering and Computer Science, 2019-08) Otuoze, Abdulrahaman; Mustafa, M.W.; Mohammed, OO; Saeed, M.S.; Salisu, S; Surajudeen-Bakinde, N.T.
    Electricity theft has caused huge losses over the globe and the trend of its perpetuation constantly evolve even as smart technologies such as smart meters are being deployed. Although the smart meters have come under some attacks, they provide sufficient data which can be analysed by an intelligent strategy for effective monitoring and detection of compromised situations. So many techniques have been employed but satisfactory result is yet to be obtained for a real-time detection of this electrical fraud. This work suggests a framework based on Universal Anomaly Detection (UAD) utilizing Lempel-Ziv universal compression algorithm, aimed at achieving a real-time detection in a smart grid environment. A number of the network parameters can be monitored to detect anomalies, but this framework monitors the energy consumption data, rate of change of the energy consumption data, its date stamp and time signatures. To classify the data based on normal and abnormal behaviour, Lempel-Ziv algorithm is used to assign probability of occurrence to the compressed data of the monitored parameters. This framework can learn normal behaviours of smart meter data and give alerts during any detected anomaly based on deviation from this probability. A forced aggressivemeasure is also suggested in the framework as means of applying fines to fraudulent customers.
  • Item
    Electricity theft detection framework based on universal prediction algorithm
    (Indonesian Journal of Electrical Engineering and Computer Science, 2019-08) Otuoze, Abdulrahaman; Mustafa, M.W.; Sofimieari, I.E.; Dobi, A.M; Sule, A.H; Abioye, A.E.; Saeed, M.S.
    Electricity theft has caused huge losses over the globe and the trend of its perpetuation constantly evolve even as smart technologies such as smart meters are being deployed. Although the smart meters have come under some attacks, they provide sufficient data which can be analysed by an intelligent strategy for effective monitoring and detection of compromised situations. So many techniques have been employed but satisfactory result is yet to be obtained for a real-time detection of this electrical fraud. This work suggests a framework based on Universal Anomaly Detection (UAD) utilizing Lempel-Ziv universal compression algorithm, aimed at achieving a real-time detection in a smart grid environment. A number of the network parameters can be monitored to detect anomalies, but this framework monitors the energy consumption data, rate of change of the energy consumption data, its date stamp and time signatures. To classify the data based on normal and abnormal behaviour, Lempel-Ziv algorithm is used to assign probability of occurrence to the compressed data of the monitored parameters. This framework can learn normal behaviours of smart meter data and give alerts during any detected anomaly based on deviation from this probability. A forced aggressivemeasure is also suggested in the framework as means of applying fines to fraudulent customers.
  • Item
    ENERGY CONSUMPTION IN PERPETUAL WIRELESS SENSOR NETWORKS
    (Zaria Journal of Electrical Engineering, 2020) Abdulkarim, A; Oloyede, AA; Olawoyin, L.A.; Faruq, N; Otuoze, Abdulrahaman
    This paper investigates the amount of energy consumed in different configuration for perpetual wireless sensor networks. Wireless Sensor Networks (WSNs) represent an area of networking that become pivotal in many applications. The use of WSNs for the monitoring of environments, habitats as well as systems within industry and healthcare has made WSNs a crucial area of research within recent years. The principles behind WSNs involve the deployment of remote sensing and relay nodes, able to collect and transmit raw data for processing. Applications such as remote environmental monitoring present new challenges such as the prospect of developing networks that can operate perpetually to collect data for as long as possible. Simulation and theoretical analysis were done using the networking simulator DENSE. DENSE is presented to provide insight into what protocols and energy saving techniques can be employed to establish the possible feasibility of constructing PWSN. The results show that mesh is the most realistic due to its energy distribution and optimization over a large area for a great number of nodes; however, a small single hop based network can provide good result for energy consumption and packet success rates.
  • Item
    Field loss calculation of a wind‐powered axial flux alternator by analytical equations
    (Engineering Reports, 2021) Otuoze, Abdulrahaman; Mohammed, OO; Ibrahim, Oladimeji; Salisu, S; A.A, Emmanuel; Usman, A.M.; Dobi, A.M
    Various techniques have been investigated and proposed for core loss minimiza-tion in electrical machines. Nevertheless, many of such methods are mostlycomplicated and not suitable for consideration at a preliminary design stage. Inthiswork,asimplifiedprocedurewhichusesananalyticalapproachtominimiz-ing the field’s losses of an Axial Flux Permanent Magnet Alternator (AFPMA),is presented. First, the output equation of an AFPMA is referred, and then theminimization of the losses is investigated by analytical differential equations.The result of the derived-specific magnetic loading is investigated using threedifferent core materials, namely 35RM300, 50JN350, and 65JN800, and is foundto reduce with increased frequencies. The 35RM300 core material gives themaximum specific magnetic loading and minimum power loss at investigatedfrequencies of 50 to 500Hz. Although the 35RM300 core material gives the bestperformance, the optimal values are only determined as suitable by the manu-facturer’s design criteria. This study is a key indicator for a simple and efficientcore material selection in the design of a Wind-Powered AFPMA without theneed for complicated analyses at the preliminary design stage
  • Item
    Fire and explosive risk assessment for combustible powder pneumatic conveyor system
    (Annals of the Faculty of Engineering Hunedoara, 2020-02-01) Otuoze, Abdulrahaman; Ibrahim, Oladimeji; Akorede, MF; Abdulkarim, A; Abdulateef, A.I.; Ogunbiyi, Olalekan
    Failure to properly define operating hazards associated with pneumatic conveying system for combustible powder transportation has led to several incidences of fires and explosions. These hazards are mostly preventable if adequate safety measures are provided for the pneumatic conveying systems for dust and combustible materials during the system design, installation and operating stages. This paper presents assessment on risk of fire and explosive hazards associated with pneumatic conveying system for a combustible powder transportation and prescribe the best practice to prevent possible accident that might result from improper practice. The safety practice and relevant regulations for zoning of the operating area and guide for proper selection of suitable class of measuring instrumentation for safe system operation are enumerated.
  • Item
    A Hybrid PSO-ANFIS Approach for Horizontal Solar Radiation Prediction in Nigeria
    (ELEKTRIKA-Journal of Electrical Engineering, 2019-08-31) Otuoze, Abdulrahaman; Salisu, S; Mustafa, Mohd; Mamunu, Mustapha; Mohammed, OO
    For efficient and reliable hydrogen production via solar photovoltaic system, it is important to obtain accurate solar radiation data. Though there are equipment specifically designed for solar radiation prediction but are very expensive and have high maintenance cost that most countries like Nigeria are unable to purchase. In this study, the accuracy of a hybrid PSO-ANFIS method is examined to predict horizontal solar radiation in Nigeria. The prediction is done based on the available meteorological data obtained from NIMET Nigeria. The meteorological data used for this study are monthly mean minimum temperature, maximum temperature, relative humidity and sunshine hours, which serves as inputs to the developed model. The model accuracy is evaluated using two statistical indicators Root Mean Square Error (RMSE) and Coefficient of determination (R²). The accuracy of the proposed model is validated using ANFIS, GA-ANFIS models and other literatures. Based on the statistical parameters used for the model evaluation, the results obtained proves PSO-ANFIS as a good model for predicting solar radiation with the values of RMSE= 0.68318, R²= 0.9065 at the training stage and RMSE= 1.3838, R²= 0.8058 at the testing stage. This proves the potentiality of PSO-ANFIS technique for accurate solar radiation prediction
  • Item
    Implementation of a Cloud-Based Home Automation System
    (CPJ, 2016) Otuoze, Abdulrahaman; NT, Surajudeen-Bakinde; Isiwekpeni, OH; Abdulrahman, TA
    Home automations provide full control and flexible monitoring of home appliances for increased comfort, efficient energy use, costs saving, improved safety and security, and have driven the development of various smart homes technologies. This paper presents the implementation of a home automation system utilizing the Internet of Things (IoT) technology. This work tackles the problems of complexity and incompatible standards inherent in the existing home automation solutions using a robust distributed computing approach. The embedded system operates on dual Advanced Virtual RISC (AVR) microcontrollers, ATmega328p and ATmega16L, interfaced to input and output modules – sensors, actuators, Wi-Fi shield, LCD, keypad etc. – for interactions with users, appliances and the environment. The HTML5 based intuitive mobile and web applications, developed for the system, induces unrestricted flexibility in the system operations and management. The system deploys a novel Web Application Messaging Protocol (WAMP), implemented with WebSocket full duplex and persistent connection protocol and JSON data serialization, for seamless individual applications and subsystems integration with a relatively high level of security through web service security protocol. This cloud-based home automation solution has lower implementation cost compared to the existent systems because, as it removes the expensive costs of on-premise high end computers and dedicated public IP addresses.
  • Item
    IMPLEMENTATION OF AN SMS AND VOICE-CONTROLLED ELECTRONIC BILLBOARD
    (Ahmadu Bello University, Zaria, 2016) Otuoze, Abdulrahaman; NT, Surajudeen-Bakinde; Ojo, E.S.; Akindiya, D.J.; Ibidun, B.F.; Adeniyi, A.
    The use of electronic medium in communication system is on geometric rise due to its flexibility, attractiveness, speed and efficiency. Various modes have been adapted in the transformation from the use of traditional billboards to electronic billboards in information dissemination. These modes include colour coated glass paper display, reflective mode display method, on-board editing of the content of an electronic billboards etc. with complicated problem of modifying the displayed content. This paper presents an implemented short message service (SMS) Controlled Electronic Billboard with Audio Output to enable ease and comfort of the administrator who determines the content of the billboard from any location. The input can be from a mobile phone or a web-based SMS application, provided the source is linked to a service provider. The billboard basically contains a microcontroller unit (AT89S52), a Subscriber Identity Module (SIM) modem and a matrix of Light Emitting Diodes (LEDs). The input to the display comprises a SIM900 Global System for Mobile communication (GSM) modem that takes care of the SMS and voice call reception for broadcasting any voice call placed on the SIM to the target audience. The text is received by the SIM modem and is transferred to the microcontroller which decodes the message using a set of rules. The decoded message is then used to automatically switch ON and OFF appropriate LEDs in order to display the character received as SMS on the screen of the billboard. Also, Voice call functionality has been incorporated to enable it receive calls and broadcast the audio message with a reasonable sound level to the target audience. It was designed, constructed, tested and found to meet the design specifications.
  • Item
    Introduction to Electrical and Electronics Engineering Discipline
    (OLAD PUBLISHERS, 2015-04) Akanni, Jimoh; Otuoze, Abdulrahaman; Adamariko, Clement; Ogunsakin, Joy; Mohammed, Obalowu
    Introduction to electrical and electronics engineering profession: Definition of electrical and electronics engineering. Specializations/ Options in electrical and electronics engineering.Use of various implements and equipment in electrical and electronics engineering for various operations/process.Prospects and job opportunities in electrical and electronics engineering as a profession. Relevant regulatory bodies and societies in electrical and electronics engineering.The role of electrical engineers in advancement of humanity.
  • Item
    Parametric Modelling of Phase-Shifted Full-Bridge Zero Voltage Switching DC-DC Converter
    (Jordan Journal of Electrical Engineering. All rights reserved-Volume, 2021-03) Ibrahim, Oladimeji; Yahaya, N.Z.B.; Otuoze, Abdulrahaman; Saad, N; Hasan, K.N.B.M; Shannan, N.M.; Zakariyya, O.S.
    Modelling of switching pulse width modulated phase-shifted full-bridge zero voltage converter is highly challenging due to several transitional stages involved in a complete switching cycle. The circuit averaging technique has been favored in the past three decades considering phase-shifted full-bridge converter as a buckderived converter. This modelling approach requires several assumptions that include zero equivalent series resistance of output capacitor, zero leakage inductance and unity transformer turn ratio which results in a less accurate system dynamics. In this paper, a system identification approach is proposed for obtaining a more accurate model of phase-shifted full-bridge PWM switching converter using the input-output test data. The model parameter estimation is implemented in Simulink environment incorporating all circuit parasitic parameters and the resulting system’s frequency response shows a good agreement when compared with reported measured response.
  • Item
    Replacement Model for Street Lighting Systems
    (Nigerian Journal of Technology, 2021) Otuoze, Abdulrahaman; Usman, A.M.; Adediran, Y.A.; Mohammed, OO; Zakariyya, O.S.
    Replacing failed bulbs of streetlights in a location can be very tasking and expensive if the optimal time for replacement is not determined. In this paper, a model has been developed that helps to establish the optimal time for the replacement of streetlight bulbs. Burnt-out bulbs are replaced individually when they fail, and group replacement is carried out on all bulbs after a specified time. The costs for both individual replacement and group replacement are determined. The developed model was applied to locally sourced data from a field survey of a streetlight installation at the University of Ilorin, Ilorin, North-central Nigeria. The model gave the optimum replacement time of burnt-out bulbs as the eighteenth week when applied to the data used in this work. The optimum replacement time will be dependent on the dataset used. This makes the developed model useful in establishing the optimal replacement time of any stochastically failing items that are in large quantities. The model will help to reduce maintenance costs for facility managers.
  • Item
    A review of probabilistic approaches for available transfer capability calculation
    (Arid Zone Journal of Engineering, Technology and Environment, 2019-03-04) Otuoze, Abdulrahaman; Mohammed, OO; Mustafa, M.W.; Salisu, S; Abdulrahman, A.Y.
    Several deterministic approaches have been proposed in literature for available transfer capability (ATC) computation. However, the gradual shift in power generation sources from fossil fuels to renewable energy sources has a remarkable influence on the ATC evaluation. The deterministic approaches do not incorporate the uncertainties of the renewable energy sources efficiently, therefore, various probabilistic techniques have been proposed in literature. This article presents a review of the various probabilistic methods for ATC computation. It provides the background, techniques and the features of ATC. Several contributions made by researchers, using probabilistic techniques for ATC computation, have been highlighted in this paper. This review has shown that there is a need for improvement in the existing approaches in order to evaluate ATC accurately. The improvement includes the development of a robust technique incorporating the system uncertainties and the uncertainties due to the renewable energy system as well as complete system dynamics in ATC computation. In addition, evaluation of ATC incorporating the transfer capability margins (TRM and CBM) is necessary to avoid over-/under-estimation of ATC value. This review will serve as a guide for the entrants in this research area.
  • Item
    A Review of Smart Grids Deployment Issues in Developing Countries.
    (Faculty of Engineering, University of Maiduguri, Maiduguri, Nigeria., 2017) Otuoze, Abdulrahaman; Usman, A.M.; Mohammed, OO; Jimoh, A.A.
    Smart Grids (SGs) have taken a centre stage in achieving a smarter, more reliable, robust, secured, economically efficient and more environmentally friendly mode of power generation and utilisation. Massive deployment is being recorded in developed worlds. While most of these countries are investing heavily in the development of SGs, well-articulated areas of research and development are key aspects with special emphasis on its security since it involves complex interconnection of units and systems which are expensive to install and maintain. In developing nations, especially those of Africa, realisation of adequate power supply to meeting the ever-growing demand has been a mirage with demand on geometric increase and with every increase largely meaning a drift away from the supply. Hence, attention is focused on capacity expansion in most developing nations rather than SGs deployments especially considering the various challenges militating against the development despite the huge advantages. Although, some of these nations have made tremendous achievements in this regard, the associated challenges have become major source of worry for most of the nations. This paper gives highlights of these issues and possible measures of overcoming them in order to enhance sustainable SGs deployments in developing countries like Nigeria.
  • Item
    Sizing of wind powered axial flux permanent magnet alternator using analytical approach
    (Nigerian Journal of Technology, 2016) Otuoze, Abdulrahaman; Ogidi, O.O.; Mohammed, OO; Jimoh, A.A.; Olaiya, B.S.
    The demand for a more sustainable energy supply worldwide is constantly growing hence, leading to the exploration of various renewable energy sources in energy generation systems especially in the demand for power in homes, industrial sectors and other utilities. Hydro power, wave power, solar energy, biomass and wind power are only a few that are being harnessed in various capacities. With new advances in wind energy technologies and energy conversion systems, a perfect fit is found in the utilization of wind in developing direct drive energy conversion systems. In this work, a wind-powered, single-phase, permanent magnet alternator utilizing an axial flux distribution system is developed. Using analytical calculations, the design parameters of the alternator’s main dimensions were obtained in a similar procedure for conventional electrical machines. To prove the feasibility of the concept, a prototype was built and tested. The alternator was built using Neodymium Iron Boron (NdFeB), a permanent magnet, with high concentration of flux around its periphery. The stator is slot-less and carries a concentrated air-cored type of winding. The procedures leading to either the selections and/or calculations for the machine parameters were carried out from first principle and fundamental assumptions in electrical machines design were made accordingly. Tests were conducted to determine its voltage output and were found optimal giving the abound limitations as stated.
  • Item
    Smart grids security challenges: Classification by sources of threats
    (Sciencedirect, 2018-12-01) Otuoze, Abdulrahaman; Mustafa, Mohd; Larik, Raja
    Smart grids (SGs) deployments have made power systems operation more efficient by the application of distributed computing schemes in grids’ interoperation. However, these schemes have triggered various security issues which are growing to be of major concerns. Physical attacks, cyber-attacks or natural disasters are major notable form of threats to SGs deployment which could lead to infrastructural failure, blackouts, energy theft, customer privacy breach, endangered safety of operating personnel, etc. Hence, the need to critically examine the security issues aimed at preventing possible threats or failures. In this review, various security challenges and threats are discussed with respect to their possible sources of occurrence. These threats are then classified and a framework for achieving more secured SGs is suggested.