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.
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Showing 1 to 17 of 17 for “"three-phase system"”.
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Measurement of Working, Reflected, and Detrimental Active Power in a Three Phase System
Study of the decomposition of the active power into composite components with respects to power industry economics namely, working active power, reflected active power, and detrimental active power. The working active energy is considered the permanent flow of useful energy to the load that results …
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A method of measuring negative-phase-sequence currents in a three-phase system
… the negative-sequence current in an unbalanced three-phase circuit. A four-winding current transformer, in conjunction with a phase shift network and an alternating current ammeter, was used for obtaining a current proportional to, and in phase with, the negative-sequence current. After …
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An Analysis of Vocational Education Programs and Support Services for Special Needs Students in Illinois, 1979-1983
… for Vocational Education and which received Three Phase System (T.P.S.) team evaluation reports during the academic years 1979-1983.
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Load compensation : design of a real time analysis and control device
… thesis is to produce a load compensator for a three-phase system. It should be simple, accurate and affordable. The three-phase load compensator design is based on a more recent definition of power factor. Attempts to establish a universally acceptable definition can be traced as early as 1920 …
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Proof of concept data logger for non-active power
… measurement IC is used for measurement of a three phase system instantaneous voltage and current. A STMicroelectronics STM32F4 ARM Cortex M4 is used for the digital signal processing. The software uses direct memory access and high speed data capture to allow enough time to perform the new …
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Phase-field simulation of freezing water droplet
… we will introduce a quasi-compressible phase-field model that deals with this non-isothermal three-phase system involving water, ice, and air. The water-ice phase transition and the water-air fluid interface are handled by the Allen-Cahn and the Cahn-Hilliard equations, respectively. The …
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Three-phase Heat Transfer
Phase-change heat transfer involves the exchange of thermal energy when a substance transitions between different phases, such as solid to liquid (melting), liquid to vapor (boiling), or vice versa. During phase-change, energy is absorbed or released without a change in temperature. In particular, …
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Multiphase flow and mass transport through porous media
… tanks, includes both discrete and dissolved phase plume movements through the porous media. Such problems always involve the multiphase flow and mass transport through three phases, namely air, oil, and water. A finite element model is developed in this thesis based on the theory of …
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Phase domain modelling and simulation of large-scale power systems with VSC-based FACTS equipment
… available for planning and operation of multiphase power systems are based upon the assumption that the network operates under perfectly balanced conditions. The advantage of this assumption from the modelling view point is that only one phase of the three phase system needs to be considered …
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Purification of phosphoric acid by solvent extraction
… (i) chemical and physical measurements on the three-phase system, with or without impurities; (ii) process simulation and optimization. The object was to test the process technically and economically and to optimise the type of solvent. The chemical equilibria and distribution curves for the …
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Sixteen-pole programmable synchronous switch
… The device is particularly useful in power system projects and has a unique place in repetitive and 'one time' switching in power system models. The switch is totally self-contained and can be operated through a terminal interfaced to an 8086 microprocessor based microcomputer. The …
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Modeling, Analysis, and Design of Distributed Power Electronics System Based on Building Block Concept
… operation. This makes the PEBBs insensitive to system integration. Based on the building block concept, the discrete and large signal average models are developed for simulation, design, and analysis of large-scale PEBB-based systems. New average models are developed for half-bridge PEBB module …
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Studies in three phase gas-liquid-solid fluidised systems
… and operating problems that could arise in such systems as waste water, chemical, biochemical and petroleum operations involving three-phase, gas-liquid-solid fluidisation; such systems are in increasing use. It is believed that this is one of few studies concerned with `true' three-phase, …
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Energy Management of Electric Vehicle Supply Equipment in Multi-Unit Residential Buildings
… is the deployment of Energy Management Systems (EMS) dedicated to Electric Vehicle Supply Equipment (EVSEs), which can intelligently allocate power and enhance utilization of existing electrical infrastructure without major physical modifications. To address these challenges across …
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Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems
… bi-directional converters in renewable energy systems. The dissertation explores a dc-electronic distribution system for residential and commercial applications with a focus on the design of an ac-dc bi-directional converter for such application. This converter is named as the "Energy Control …
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Modeling and Analysis of a Dc Power Distribution System in 21st Century Airlifters
A DC power distribution system (PDS) of a transport aircraft was modeled and analyzed using MATLAB/Simulink software. The multi-level modeling concept was used as a modeling approach, which assumes modeling subsystem of the PDS at three different levels of complexity. The subsystem models were …
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Investigation of the Interactions Among Grass, Chlorophenols and Microbes
… contaminants. The research was divided into three studies: interactions between live grasses and 2,4-dichlorophenol (DCP), 2,4,6-trichlorophenol (TCP), and pentachlorophenol (PCP); physico-chemical interactions between the three chlorophenols and root tissue; and effect of root exudates on …