Browsing by Author "Ibrahim, Oladimeji"
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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 MohammedHybrid 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 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 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, OlalekanFailure 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 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 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.