Browsing by Author "Salisu, S"
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Item The challenges and panaceas to power distribution losses in Nigeria(Faculty of Engineering, University of Maiduguri, Maiduguri, Nigeria., 2020-03) Mohammed, O. O.; Otuoze, A. O; Salisu, S; Abioye, A. E; Usman, A. M; Alao, R. AEnergy 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 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 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 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.MVarious 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 stageItem 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, OOFor 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 predictionItem 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 Threats and Challenges of Smart Grids Deployments-A Developing Nations’ Perspective.(Published by School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia., 2019) Otuoze, Abdulrahaman; Mustafa, Mohd; Ibrahim, Oladimeji; Salisu, S; Mohammed, OO; Oloyede, AA; Gaya, ZubairuConsiderable efforts in huge investments are being made to achieve a resilient Smart Grids (SGs) deployment for the improvement of power delivery scheme. Unsurprisingly, many developing nations are making slow progress to the achievement of this feat, which is set to revolutionize the power industry, own to several deployment and security issues. Studying these threats and challenges from both technical and non-technical view, this paper presents a highlight and assessment of each of the identified challenges. These challenges are assessed by exposing the security and deployment related threats while suggesting ways of tackling these challenges with prominence to developing nations. Although, a brief highlight, this review will help key actors in the region to identify the related challenges and it’sa guide to sustainable deployments of SGs in developing nations.Item Virtual synchronous generator: an overview(Nigerian Journal of Technology, 2019-01-16) Mohammed, OO; Otuoze, Abdulrahaman; Salisu, S; Ibrahim, O; Rufa'i, N.A.The continuous increase in the penetration of renewable energy (RE) based distributed generations (DGs) in the power system network has created a great concern on the stability of the existing grid. Traditional bulk power plants, which are dominated by synchronous machines (SMs) can easily support system instability, due to the inherent rotor inertia and damping characteristic, as well as voltage (reactive power) control ability. Nevertheless, converter based RE has some special characteristics, such as stochastic real and reactive power output, quick active and reactive power response, small output impedance, and little or no inertia and damping property thereby causing frequency and voltage instability in the system. To solve this problem, virtual synchronous generator (VSG) concept was proposed to emulate some of the features of conventional SG through converter control strategy in order to provide additional inertia virtually. Different control schemes for VSG has been proposed in literature. Surprisingly, an overview of these schemes is yet to be efficiently presented. This paper presents an overview of the VSG control schemes. It provides the concepts, the features of the control schemes and the applications of VSG. Finally, the crucial issues regarding VSG control schemes and the necessary improvement that need to be addressed are highlighted.