Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 112 for “"Electric energy"”.
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Electrostatic vibration-to-electric energy conversion
… devices capable of electrostatic vibration-to-electric energy conversion at the microwatt level. The fundamental means of en- ergy conversion is a variable capacitor that is excited through a generating energy conversion cycle with every vibration cycle of the converter. This thesis presents a …
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Vibration-to-electric energy conversion using a mechanically-varied capacitor
Past research in vibration energy harvesting has focused on the use of variable capacitors, magnets, or piezoelectric materials as the basis of energy transduction. How- ever, few of these studies have explored the detailed circuits required to make the energy harvesting work. In contrast, this …
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A demonstration of useful electric energy generation from piezoceramics in a shoe
The feasibility of harnessing electric energy using piezoelectric inserts in a sport sneaker has been demonstrated. Continuing in that spirit, this thesis compares regulation schemes for conditioning the electric energy harnessed by a piezoceramic source imbedded in a shoe insole. Two off-line, …
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Probabilistic impact of charging plug-in electric vehicles on the electric energy distribution systems
The electric power grid including generation, transmission, and distribution system usually serving the loads in the consumer’s side through distribution transformers. Generally, increasing the demand requires increasing the supply and therefore any increasing in the consumer’s side must be covered …
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Lithium ion power generator : a novel system for direct thermal to electric energy conversion
Wireless sensing technology has advanced greatly, but a critical obstacle to miniaturization and true autonomy is how to power sensors. Lithium ion batteries have been ideal power sources due to their high power density, but autonomy requires some form of power generation. The unique demands of …
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Design, analysis, and control of switched supercapacitor banks for e-transportation electric energy storage systems
… of supercapacitors (SCs) with batteries in electric vehicles (EVs) improves the battery life, acceleration, and driving range. However, the efficiency of the power interface that unites the batteries and SCs are affected due to wide voltage variations at the SC bank terminals. Moreover, the …
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Statistical Analysis of Electric Energy Markets with Large-Scale Renewable Generation Using Point Estimate Methods
The restructuring of the electric energy market and the proliferation of intermittent renewable-energy based power generation have introduced serious challenges to power system operation emanating from the uncertainties introduced to the system variables (electricity prices, congestion levels …
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3-Phase 4-Leg(3P4L) converters control for massive electric energy storage systems integration in low voltage grids
La necesidad de abandonar la producción eléctrica basada en combustibles fósiles altamente contaminantes está propiciando un cambio en el sistema eléctrico mundial, moviéndose de un sistema centralizado hacia una generación distribuida formada por generadores basados en energías renovables (paneles …
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Analysis of the Impact of Solar Thermal Water Heaters on the Electrical Distribution Load
… the impact of solar thermal water heaters on the electric water heating load curve in a residential distribution circuit is analyzed with realistic hot water draw profiles. For this purpose, the electric and solar thermal water heater models are developed in MATLAB and validated with results from …
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The Spectroscopic Characterization Of Newly Developed Emissive Materials And The Effects Of Environment On Their Photophysical Properties
… capable of efficient charge transfer and energy storage has become increasingly important in many areas of modern chemical research. This is especially true for the development of emissive optoelectronic devices and in the field of solar to electric energy conversion. The characterization …
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Influencia del plan nacional de asignación de derechos de emisión en el sector eléctrico español
… plans have caused a notable effect on the electric energy generation and transmission sector. The main objective of this thesis is to develop a simulator in order to analyse, from an overall point of view, the behaviour of the electric market and its effect on the transmission networks. …
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Optimization of Distribution Systems: Transactive Energy and Resilience Enhancement
The increasing penetration of electric vehicles (EVs) and other distributed energy resources (DERs) offers enhanced flexibility and resilience. During extreme conditions, grid-connected EVs and DERs can provide electricity service and restore critical loads when the utility system is unavailable. …
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Design and analysis of an ASIC for energy harvesting applications
… of the power conditioning circuits of a piezoelectric energy harvesting system. Commercial piezoelectric generators with a frequency range of 26 – 205 Hz were used to convert kinetic energy to electric energy. A 6 stage AC/DC charge pump designed by a previous student was redesigned to …
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Towards resilient plug-and-play microgrids
… have the potential to increase renewable energy penetration, reduce costs, and improve reliability of the electric grid. However, today's microgrids are unreliable, lack true modularity, and operate with rudimentary control systems. This thesis research makes contributions in the areas of …
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An economic study of a proposed 2000-KW turbo-generator unit in the Virginia Polytechnic Institute central heating and power plant
… most of the buildings located on the oampus.The electric energy is generated as a by-product of the basic heating function of the plant.
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Photonic crystal cavity with self-similar structure and single-photon Kerr nonlinearities
… that achieve ultrasmall mode volume (Vff). The electric energy density of a cavity mode can be maximized in the air or dielectric region, depending on the choice of boundary conditions. We illustrate the design concept with a silicon-air ID photon crystal cavity that reaches an ultrasmall mode …
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A study of the production costs of the services of an isolated central heating and power plant at the Virginia Polytechnic Institute
… Virginia Polytechnic Institute are as listed: 1. Electric energy 2. High pressure heating 3. Low Pressure heating 4. Hot soft water 5. Cold soft water. Before the first of October 1930 there were no daily records kept of the various steam, electrical and water services. Weekly or monthly readings …
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Energy Management System in DC Future Home
Making electricity grids smarter and facilitating them with integration of renewable energy sources (RES) and energy storage are fairly accepted as the necessary steps to achieve a sustainable and secure power industry. To enable Net-zero energy and optimize power management for future homes or …
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Technoeconomic Analysis of Textured Surfaces for Improved Condenser Performance in Thermoelectric Power Plants
… potential in improving the efficiency of energy applications. The first part of the thesis work aims at developing a fundamental mathematical understanding of the wetting process on the solid surface followed by presenting fabrication methodologies specifically focused on metallic …
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