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    HYBRID ENERGY STORAGE SYSTEMS FOR ENERGY EFFICIENT ELECTRIC DRIVE VEHICLES: CONVENTIONAL APPROACHES AND MUTLI-SOURCE TOPOLOGIES

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    Salari, Omid
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    Abstract
    With the increasing global awareness and call for reduced dependence on fossil fuels and their polluting byproducts, energy efficient electric vehicles are gaining more attention for replacing internal combustion engine vehicles. Current battery technologies such as the Li-ion batteries, as the main source of energy in the electrified vehicles offer good energy density features, which fulfills the energy requirements for covering long mileages. However, other performance metrics for batteries such as power density, thermal operating range, and cyclic life span is not sufficiently high. In this regard, electric vehicle manufacturers have been overdesigning the battery packs in their products to offer adequate degree of confidence to the market for more appeal towards the electrified vehicles. This has led to an increase in the weight, volume, and the price of the battery packs. As an attempt to address the aforementioned challenges, hybridization of the battery packs with super-capacitors has been suggested. Super-capacitors offer complementary characteristics to the battery packs such as high-power density, wide thermal operating range, and high number of cyclic life span. Nevertheless, hybridization of the battery packs as the energy source and the super capacitors banks as the power source to take the advantages of both sources introduces new challenges. The need for electrical converters for compliance of these sources, and the requirement for the control system to share the power demand between these two sources based on their inherent features are among the concerns to be addressed. This thesis introduces new electronic hardware structure for incorporative utilization of battery packs and super-capacitor banks, moderated by supervisory control systems for power sharing purposes between the energy and the power sources in electric vehicle applications.
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    http://hdl.handle.net/1974/28569
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