Marian K. Kazimierczuk (Advisor), Saiyu Ren (Committee Member), Yan Zhuang (Committee Member)
Master of Science in Electrical Engineering (MSEE)
Supercapacitors have become reliable energy sources in a wide variety of applications such as automobiles, portable electronics, recreational sports equipment, medical equipment, aerospace power supplies, etc. Typically, these are electrochemical capacitors with high values of capacitance (tens or hundreds of farads) and possess the characteristics of both traditional electrolytic capacitors and batteries. They are also known as Ultra-capacitors or Electrical Double Layer Capacitors. They work on the principle of electrical double layer for charge storage. Supercapacitor have a much higher energy and power stored per unit volume over conventional capacitors. They also exhibit longer shelf life and cycle life over lithium ion batteries. Supercapacitors are widely used in applications, which require rapid charge and discharge cycles. In the recent trends in the automotive industry, it has become an imperative tool in boosting the battery performance in electric vehicles. In view of the demand for alternative and greener energy resources, this thesis aims to achieve the following objectives: 1. To perform a rigorous literature survey on the current state-of-the-art technologies relevant to the supercapacitors and their applications. 2. To study the classification, construction, device operation, and features of the supercapacitors. 3. To investigate the RC model of supercapacitors. 4. To perform transient and frequency-domain analyzes for a 470 F and 1500 F supercapacitors. 5. To propose two high-frequency models for a super capacitor namely: a. Basic RLC model. b. Accurate RLZ model. 6. To determine the expressions for the total impedance of the two models. 7. Validate the theoretically obtained results with SABER circuit simulations and experiments using a Maxwell 2.7 V 350 F general application supercapacitor. 8. To analyze and design buck-boost and boost pulse-width modulated dc-dc converters supplied by supercapacitors and validate the theoretically predicted results using SABER circuit simulator.
Department or Program
Department of Electrical Engineering
Year Degree Awarded
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