Browsing by Author "Saad, N"

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    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) Ibrahim, O; Yahaya, N. Z; Saad, N; Md Hassan, K. N; Otuoze, A. O; Afolayan, M. A; Madugu, I. S; Usman, A.M
    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.
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    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.