Browsing by Author "Ojo, Olorunfemi"

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    Analysis of a synchronous reluctance machine with an auxiliary single-phase winding
    (International journal of Electronic and Electrical Engineering, 2003-10-01) Ojo, Olorunfemi; Omoigui, Michael; Dong, Gan
    A three-phase synchronous reluctance machine having an axially laminated rotor structure and an auxiliary DC-source-fed single-phase control winding has utility as either a high-speed generator or a high-torque low-speed motor. This paper provides an understanding of its operation using electric circuit and electromagnetic field concepts in the process of which some insights are provided into the design of the windings, conditions for torque production and generation of electric power when operating in the motoring or generating modes. Some confirmatory experimental results of analytical developments are provided showing performance characteristics of an experimental machine.
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    Analysis of multi-terminal unified power flow controller for power transfer
    (IEEE, 2008-09) Omoigui, Michael; Karugaba, Sosthenes; Ojo, Olorunfemi
    The paper reports the results of analysis of a multi-terminal UPFC used for power transfer and stability improvement of power systems. The analysis employed abc to qd0 transformation technique to obtain a time-invariant equation describing the system. A simulation of a-two transmission network rated at 20 and 15 MVA at 33 kV was investigated. Results confirm that converters rated appropriately can be used to transfer power between the lines. Converter power and current optimization were carried out to determine their operational limits.