Browsing by Author "Saleh, Saleh A."

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    Second harmonic based method to detect geomagnetically induced currents in power transformers
    (University of New Brunswick, 2024-04) Zundel, Eric Walter; Saleh, Saleh A.
    Geomagnetically Induced Currents (GICs) are quasi-dc currents triggered by inter-actions between the Earth’s magnetic field and charged particles released by the sun during coronal mass ejections. These currents flow through grounding circuits (such as grounded power transformers) into power systems, and can damage power system components. A power transformer with a GIC flow experiences half-cycle saturation, causing harmonic distortion and increased reactive power demands. As a result, power transformers can suffer damage, mal-operation of protective devices, tripping of compensation devices, and degraded power quality. Various methods have been developed to respond to GIC flows, the majority of which identify the need for blocking of GIC flows. To block GIC flows, a method to accurately detect GIC is required. This thesis focuses on the development of an effective measure to detect the GIC flow. The desired detection measure is based on the second harmonic component extracted from power transformer differential currents.
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    The one-node approach to implement smart grid functions for residential loads
    (University of New Brunswick, 2024-03) McSporran, Eleanor; Saleh, Saleh A.; Diduch, Chris P.
    The deregulated operation of power systems has demonstrated several advantages, among which is the load-side control as a means to implement smart grid functions. When residential loads are considered, the application of smart grid functions is dependent on the communication links, accurate load models, and customer participation. This thesis proposes the one-node method to use modified load profiles (determined at the point-of-supply) to generate the command active power for load-side controls. Test results show that smart gird functions can operate certain appliances to store thermal energy during off-peak-demand hours, this then reduced their power demands during the peak-demand hours. Moreover, the one-node method is tested to implement centralized smart grid functions through a battery system, which is charged and discharged based on the one-node method. This thesis presents and discusses the performance of both controls in terms of total losses and impacts on voltage during peak-demand hours.