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Showing 1 to 20 of 22 for “"ultracapacitor"”.
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The assessment of battery-ultracapacitor hybrid energy storage systems
Battery-ultracapacitors hybrid energy storage systems (ESS) could combine the high power density and high life cycle of ultracapacitors with the high energy density of batteries, which forms a promising energy storage system. In this thesis, an assessment of the benefits of the hybrid ESS relative …
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Improvements on carbon nanotube structures in high-energy density ultracapacitor electrode design
Ultracapacitors are a class of electrochemical energy storage device that is gaining significant industrial traction due to their high charging rate and cycle life compared to rechargeable batteries; however, they store significantly less energy on a per-volume basis. The quest to find an electrode …
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Design of a miniature high-speed carbon-nanotube-enhanced ultracapacitor for electronics applications
… are utilized to create miniature high-speed ultracapacitors. Because the nanotubes are grown on silicon using low pressure chemical vapor deposition, this technique also opens the possibility of high-value integrated (on-die) capacitors. Using this technique a capacitance density of 52 …
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Ultracapacitor characterization using a novel dynamic parameter identification modeling technique for electric transportation applications
Ultracapacitors (UCs), also known as Supercapacitors or double layer capacitors, are the promising technology devices used for storing energy in the field of energy storage systems. These ultra-capacitors, being a low voltage device, provide fairly large capacitance values as compared to the …
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High energy and power density nanotube-enhanced ultracapacitor design, modeling, testing, and predicted performance
… (limited to tens of minutes). Commercial ultracapacitors are energy storage systems that solve these problems by offering more than one million recharges with little capacitance degradation, recharge times on the order of few seconds, and unlimited shelf life. However, today's …
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Ultracapacitor character analysis and its application in unified power quality conditioner as energy storage system
"This dissertation focuses on the Ultracapacitor (UCAP) character analysis and its application in Unified Power Quality Conditioner (UPQC) as an Energy Storage System (ESS) for improved UPQC performance. It includes three parts as described below. The first part is Paper I. The UCAP is a popular …
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Advances in Lithium Ion Batteries Obviate Need for Ultracapacitors in Electric Vehicles
… are rapidly obviating the need for battery/ultracapacitor (UC) hybrid circuit topologies (active/passive) in electric vehicles (EV). In this paper, available models in MATLAB/Simulink are used to assess the need for lithium ion battery/ultracapacitor hybrid topologies. The battery parameters …
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Hybrid electric vehicle regenerative-braking using ultracapacitors
The concept and application of ultracapacitors for electric load leveling and regenerative braking is presented. Proposed sizing of an ultracapacitor system is presented and discussed based on the available energy and the nominal operating voltage from a hybrid electric vehicle transit bus; A …
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Modeling of electrical behavior of graphene-based ultracapacitors
… energy storage, especially for high performance ultracapacitors. Graphene-based ultracapacitors show high stability, significantly-improved capacitance and energy density with fast charging and discharging time at a high current density, due to enhanced ionic electrolyte accessibility in deeper …
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Memory and data communication link architecture for micro-implants
… to replace the bulky batteries in these devices. Ultracapacitors have the potential to be integrated on a silicon wafer, and have the benefits of an unlimited number of recharge cycles and extremely rapid recharging times. However, they present an essential challenge in that the voltage drops …
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Power Interface Design and System Stability Analysis for 400 V DC-Powered Data Centers
… research work. The HESU consists of battery and ultracapacitor packs. The ultracapacitor can improve the battery lifetime and reduce any transients affecting grid side operation. </p> <p>The large signal model of a typical solar power integrated datacenter is built to analyze the system stability …
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PSCAD Modeling and Stability Analysis of a Microgrid
… storage techniques in the form of battery and ultracapacitor systems. One of the evolutions occurring in the power system is the emergence of microgrids, small power systems capable of isolating from the major power grid in the form of islands. Microgrids use distributed generation to provide …
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A simulation-based assessment of plug-in hybrid electric vehicle architectures
… PHEVs, as well as parallel and split PHEVs with ultracapacitors, were performed in Autonomie, the vehicle simulation package released by Argonne National Laboratory as the successor to the Powertrain System Analysis Toolkit (PSAT). The PHEV configurations were parameterized by battery capacity, …
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Benefits of battery-uItracapacitor hybrid energy storage systems
… explores the benefits of battery and battery-ultracapacitor hybrid energy storage systems (ESSs) in pulsed-load applications. It investigates and quantifies the benefits of the hybrid ESS over its battery-only counterparts. The metric for quantifying the benefits is charge efficiency - the …
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Development and Validation of a Powertrain Simulation Model for Next Generation Mild-Hybrid Buses
… of replacing the standard battery system with an ultracapacitor energy storage system. The robustness of the proposed vehicle model has been assessed through a study similar to a system sensitivity analysis assessing the effects of inputting the expected extremes of parameters on simulation …
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Energy management techniques for ultra-small bio-medical implants
… solve the engineering challenges posed by using ultracapacitors for energy storage. A major problem with using any capacitor as an energy source is the fact that its voltage drops rapidly with decreasing charge. This leaves the circuit to cope with a large supply variation and can lead to energy …
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Feasibility Study of Energy Storage Technologies for Remote Microgrid’s Energy Management System
… discharge (DoD) lead to high operational costs. Ultracapacitor has a considerably longer life cycle, its energy density is low, and the initial cost is very high. Lithium-ion (Li-ion) and hybrid ion batteries may have comparatively better economical prospects in terms of DoD, life cycle, and …
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