Device Characterization Of Solar Inverters, 2018 University of Tennessee, Knoxville
Device Characterization Of Solar Inverters, Katelyn Alexandria Bolinsky
EURēCA: Exhibition of Undergraduate Research and Creative Achievement
Solar energy is one of the most significant research thrusts in the modern era. Solar inverters are devices used to convert the DC energy of sunlight into AC energy that can be used on the power grid. Typically, they contain silicon; however, new substances such as silicon carbide and gallium nitride are being tested. These materials could increase the efficiency of solar energy, decrease the overall cost, and are potentially more durable than silicon. In order to determine if these new substances can actually benefit the solar industry, they need to be characterized for different attributes with different parameters. As ...
Stochastic Modeling Of Wireless Energy Transfer With Applications In Wireless Displacement Sensing Of Structures, Shaun G. Veilleux
Electronic Theses and Dissertations
Wireless communications are being utilized in nearly every field of work and impact virtually everyone's daily life. With the increased use of wireless sensors, the difficulty of powering them becomes more apparent. One emerging technology is the use of wireless energy transfer which utilizes either a designated transmitter or harvests otherwise wasted energy. Since the amount of transferable wireless energy is limited modeling and simulating a system's probability of operation is desired in order to maximize the run time of the sensor. These simulations allow for the investigation into the impact of a smart scheduling algorithm that can ...
Tolerance Sensitivity Analysis And Robust Optimal Design Method Of A Surface-Mounted Permanent Magnet Motor By Using A Hybrid Response Surface Method Considering Manufacturing Tolerances, 2018 LG Electronics Inc.
Tolerance Sensitivity Analysis And Robust Optimal Design Method Of A Surface-Mounted Permanent Magnet Motor By Using A Hybrid Response Surface Method Considering Manufacturing Tolerances, Cha-Seung Jun, Byung-Il Kwon, Ohbong Kwon
Publications and Research
This paper presents a robust optimal design method using a hybrid response surface method (H-RSM) which directly finds an optimal point satisfying a target Z-value or a probability of failure. Through three steps, this paper achieves the goal that is to increase the open-circuit airgap flux (OCAF) in a surface-mounted permanent magnet motor and decrease its variation caused by variations of the airgap lengths including an additional one between permanent magnets and rotor back yoke. First, the OCAF equation is derived from the magnetic equivalent circuit (MEC) considering the additional airgap. Then, the equation is validated by comparing its results ...
A Human Powered Micro-Generator For Charging Electronic Devices, 2018 Linfield College
A Human Powered Micro-Generator For Charging Electronic Devices, John Adam
A hand-pulled generator has been designed and tested. A preliminary result has been obtained and discussed. This device was created to provide outlet-free charging. Electronic devices are useful when going out into the wilderness. A portable power supply is necessary to keep an electronic device alive. This project created a device that converts human energy into electricity to charge electronic devices. This thesis overviews the device’s design, build, and tests. Two different tests were run to determine that the device is capable of charging the storage battery. The device presented can provide 14 minutes of charging time with one ...
Measuring The Double Layer Capacitance Of Electrolytes With Varied Concentrations, 2018 Linfield College
Measuring The Double Layer Capacitance Of Electrolytes With Varied Concentrations, Geoffrey Rath
When electric potentials are applied from an electrolytic fluid to a metal, a double layer capacitor, Cdl, develops at the interface. The layer directly at the interface is called the Stern layer and has a thickness equal to roughly the size of the ions in the fluid. The next layer, the diffuse layer, arises from the gathering of like charges in the Stern layer. This layer is the distance needed for ionic charges to return to equilibrium. This distance, called the Debye length, λ, depends on the square root of the electrolyte concentration. To study the properties of the ...
Increasing The Longevity Of Tungsten Filaments In A Zone Refiner, 2018 Linfield College
Increasing The Longevity Of Tungsten Filaments In A Zone Refiner, Byron D. Greenlee
Zone refining is used for its ability to purify material and grow single crystals. To produce these single crystals, a suspended molten zone, generated by electron bombardment, passes along the polycrystalline stock. During a zone refining run, the filaments that produce the electron bombardment can fail. In this project, the longevity of tungsten filaments in a zone refiner was investigated. A new bombardment geometry was constructed to attempt to increase the longevity of the filaments. The new geometry had a shield machined into it to prevent line-of-sight impurities originating in the molten zone from striking the filaments. It was found ...
Measuring The Double Layer Capacitance Of Electrolyte Solutions Using A Graphene Field Effect Transistor, Agatha Ulibarri
When operating graphene field effect transistors (GFETs) in fluid, a double layer capacitance (Cdl) is formed at the surface. In the literature, the Cdl is estimated using values obtained using metal electrode experiments. Due to the distinctive electronic and surface properties of graphene, there is reason to believe these estimates are inadequate. This work seeks to directly characterize the double layer capacitance of a GFET. A unique method for determining the Cdl has been implemented, and data has been obtained for three electrolytes and one ionic fluid. The results yield dramatically lower Cdl values than those ...
Microgrids: Resilience, Reliability, And Market Structure, 2018 Southern Methodist University
Microgrids: Resilience, Reliability, And Market Structure, Saeed Dehghan Manshadi
Electrical Engineering Theses and Dissertations
This dissertation addresses several challenges corresponding to the operation and planning of microgrids in distribution networks including the formation, energy supply resilience, the contribution of microgrids in the short-term and mid-term operation of bulk power networks and the computational challenges in operation of interdependent infrastructure systems.
An approach to transforming the active distribution network with distributed energy resources into multiple autonomous microgrids is presented in the first section. The distribution network consists of several generation resources and demand entities that could be clustered into autonomous microgrids. Eigen decomposition in the graph spectra of the distribution network is leveraged to determine ...
Scada And Plc Systems Configuration For The Ncrept Test Facility, 2018 University of Arkansas, Fayetteville
Scada And Plc Systems Configuration For The Ncrept Test Facility, Arman Ahmed
Electrical Engineering Undergraduate Honors Theses
This thesis details the project to update the control and interface system of the National Center for Reliable Electric Power Transmission (NCREPT) testing facility. The need for this project arose from the 2017-2018 expansion of the facility, which included some modifications in the layout of electrical equipment used for testing purposes. These modifications necessitated the update of the control and interface system. Additionally, the old system was implemented a decade ago and is nearing obsolescence, so the facility’s expansion served as an opportune time for an upgrade.
There were two main parts to the scope of this project, which ...
Comparison Of Data Transfer Alternatives In Asynchronous Circuits, 2018 University of Arkansas, Fayetteville
Comparison Of Data Transfer Alternatives In Asynchronous Circuits, Mark Howard
Computer Science and Computer Engineering Undergraduate Honors Theses
Digital integrated circuits (ICs) have become progressively complex in their functionality. This has sped up the demand for asynchronous architectures, which operate without any clocking scheme, considering new challenges in the timing of synchronous systems. Asynchronous ICs have less stringent environmental constraints and are capable of maintaining reliable operation in extreme environments, while also enjoying potential benefits such as low power consumption, high modularity, and improved performance. However, when the traditional bus architecture of synchronous systems is applied to asynchronous designs, handshaking protocols required for asynchronous circuit operation result in significantly increased power consumption, offsetting the low power benefit of ...
Lithium And The Foreseeable Future, 2018 University of Arkansas, Fayetteville
Lithium And The Foreseeable Future, Paolo Vargas
Mechanical Engineering Undergraduate Honors Theses
This paper aims to clarify the uncertainties regarding worldwide lithium resource availability in the years to come. Previous studies made on the subject are presented with some ambiguity and this work intends to fill the gaps. The information and data presented throughout this script with respect to global lithium resources and reserves are mostly based on data released by the United States Geological Survey (USGS). Lithium resource availability in the future is a point of paramount significance primarily for the automotive, portable electronics, and the power generation industry. Since, a change of supply would ultimately affect the price of lithium ...
Protection Against Ungrounded Single Phase Open Circuit Faults In 3-Phase Distribution Transformers, 2018 California Polytechnic State University, San Luis Obispo
Protection Against Ungrounded Single Phase Open Circuit Faults In 3-Phase Distribution Transformers, Higinio Ariel Montoya
Master's Theses and Project Reports
This thesis explores the impacts and behavior of 3-phase distribution transformers when subject to ungrounded single phase open circuit faults. A simple 3-phase system is modeled using MATLAB Simulink and operation under fault conditions are simulated and studied. Simulation results are confirmed via lab experimentation. Finally, a robust detection and protection method using neutral current injection (as proposed in industry literature) is built and demonstrated.
Electric utility operating experience has demonstrated that all too often, loads on 3-phase distribution transformers are not adequately protected against an ungrounded single phase open circuit fault (commonly called “single phasing”). This type of fault ...
Protection, Automation, And Frequency Stability Analysis Of A Laboratory Microgrid System, 2018 California Polytechnic State University, San Luis Obispo
Protection, Automation, And Frequency Stability Analysis Of A Laboratory Microgrid System, Christopher Eric Osborn
Master's Theses and Project Reports
Due to increasing changes in the power industry, Cal Poly San Luis Obispo's electrical engineering department introduced a set of initiatives to adequately equip students with the skills and knowledge to interact with new technologies. Specifically, the department proposed a microgrid and power systems protection and automation laboratory to strengthen students' knowledge of microprocessor-based relays. This paper outlines a microgrid laboratory system that fulfills the initiative's goal and proposes a collection of laboratory experiments for inclusion in a new laboratory course at Cal Poly. The experiments provide students with practical experience using Schweitzer Engineering Laboratory (SEL) relays and ...
Grid-Connected Photovoltaic Systems Based On Nonlinear Control., 2018 University of Louisville
Grid-Connected Photovoltaic Systems Based On Nonlinear Control., Pablo R. Rivera
Electronic Theses and Dissertations
Nowadays, due to the high-scale penetration of photovoltaic systems, reliable and efficient grid-connected photovoltaic (PV) systems utilizing the advances of power electronics and control system technology are desirable. Thus, single-stage grid-connected photovoltaic systems, have gained attention, especially in low voltage applications. However, PV systems exhibit nonlinear behavior that could negatively affect the performance of the system if they are not adequately compensated for. In this dissertation, using the general structure for the synchronous dq0 frame, a single-stage three-phase grid-connected photovoltaic system, and a single-stage single-phase grid-connected PV system, both with a nonlinear control strategy, are developed to track the maximum ...
Gating Methods For High-Voltage Silicon Carbide Power Mosfets, 2018 University of Arkansas, Fayetteville
Gating Methods For High-Voltage Silicon Carbide Power Mosfets, Audrey Dearien
Theses and Dissertations
The objective of this thesis is to assess the challenges associated with driving Silicon Carbide (SiC) power devices, and to compare the potential gate drive methods for these devices which address those challenges. SiC power devices present many benefits that make them suitable for next generation automotive, power utility grid, and energy management applications. High efficiency, increased power density, and reliability at high-temperatures are some of the main benefits of SiC technology. However, the many challenges associated with these devices have prevented their adoption into industry applications. The argument is made in this thesis that the gate driver is a ...
Fabrication And Characterization Of Graphene Based 2d Materials For Supercapacitors, 2018 University of Arkansas, Fayetteville
Fabrication And Characterization Of Graphene Based 2d Materials For Supercapacitors, Anishkumar Manoharan
Theses and Dissertations
Supercapacitors have attracted a lot attention due to their efficient energy storage. In comparison to batteries, supercapacitors have high capacitance, energy, and power densities per unit mass than conventional capacitors. Carbon based materials are most promising in supercapacitor application due to their outstanding physical and electrochemical behavior. In this work, a facile method to synthesize a nanocomposite electrode consisting of annealed carbon from carbon ink and MoS2 was demonstrated. Effects of various aqueous and solid electrolytes were studied. It was found that the nanocomposite electrode with 10% MoS2 and 1M Na2SO4 as the aqueous electrolyte tested using the three electrode ...
Detailed Power Measurement With Arm Embedded Boards, 2018 University of Maine
Detailed Power Measurement With Arm Embedded Boards, Yanxiang Mao
Electronic Theses and Dissertations
Power and energy are becoming important considerations in today's electronic equipment. The amount of power required to run a supercomputer for an hour could supply an ordinary household for many months. The need for low-power computing also extends to smaller devices, such as mobile phones, laptops and embedded devices.
In order to optimize power usage of electronic equipment, we need to collect information on the power consumption of these devices. Unfortunately it is not easy to do this on modern computing systems. Existing measuring equipment is often expensive, inaccurate, and difficult to operate. The main goal of this project ...
Analysis Of Photovoltaic Energy In The Eastern Kentucky Region And The Residential Financial Feasibility, 2018 Morehead State University
Analysis Of Photovoltaic Energy In The Eastern Kentucky Region And The Residential Financial Feasibility, Joshua A. Johnson
Morehead State Theses and Dissertations
A thesis proposal presented to the Faculty of the College of Business and Technology Morehead State University in partial fulfillment of the requirements for the Degree Master of Science by Joshua A. Johnson on April 25, 2018.
On-Line Condition Monitoring, Fault Detection And Diagnosis In Electrical Machines And Power Electronic Converters, 2018 Florida International University
On-Line Condition Monitoring, Fault Detection And Diagnosis In Electrical Machines And Power Electronic Converters, Alberto Berzoy
FIU Electronic Theses and Dissertations
The objective of this PhD research is to develop robust, and non-intrusive condition monitoring methods for induction motors fed by closed-loop inverters. The flexible energy forms synthesized by these connected power electronic converters greatly enhance the performance and expand the operating region of induction motors. They also significantly alter the fault behavior of these electric machines and complicate the fault detection and protection. The current state of the art in condition monitoring of power-converter-fed electric machines is underdeveloped as compared to the maturing condition monitoring techniques for grid-connected electric machines.
This dissertation first investigates the stator turn-to-turn fault modelling for ...
Solid State Light Conversion, 2018 Western Michigan University
Solid State Light Conversion, Jumana Turkistani
Demand for innovative and energy-efficient technology has increased as an environmentally sustainable society has become priority. Technological development of solid-state light plays a part in meeting that demand. Our research has revealed that LED (Light Emitting Diode) lighting uses less energy and is a more cost effective and environmentally responsible choice than incandescent and fluorescent lighting. Converting from incandescent and fluorescent dominated lighting to LED lighting may be cumbersome but can result in a classroom milieu that is attractive, cost/energy effective, easy to manipulate as well as facilitative to learning. For this project, a small-scale mockup of the light ...