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 20 of 135 for “"modes of operation"”.
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Virtual Synchronous Machine based Fuzzy V-F Control for VSC of Battery Storage System for Seamless Performance of Microgrid
… between the grid-connected and islanded mode of microgrid. The prominence of the seamless transition is to maintain the load voltage and frequency as well as constant power delivery during both the modes of operation of microgrid. In this thesis, voltage source converter (VSC) of PV generating …
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Steady-State Time-Domain Analysis of LLCL Resonant Converter
… resonant converter topology which is capable of providing zero voltage switching of MOSFET switches for a wider range of operating frequency as compared to conventional LLC resonant converter topology. The proposed topology (LLCL) is a modified form of conventional LLC resonant converter …
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A levelized comparison of pulsed and steady-state tokamaks
The goal of fusion energy research is to build an economically competitive reactor. This is difficult due to the complicated system composing a reactor and the nonlinearities it entails. Practically, to even get to the neighborhood of an economic reactor requires hundreds of simulations - which in …
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Energy management system of a microgrid with distributed generation
… System (EMS) is required to control the flow of power and match generation with the load within a microgrid during grid-connected and islanded modes of operation. In grid-connected mode, a microgrid draws/supplies power from/to the main grid, depending on the generation and load requirements, …
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Analysis and design of microprocessor-controlled peak-power-tracking system
Analyses and designs of a peak-power tracking system using microprocessor control are performed. Large-signal stability of the system for various modes of operation is analyzed to predict system dynamics. The stability analysis is supported mainly by qualitative graphical representations of …
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Analysis, design, and evaluation of the optimum topology Cuk converter in comparison with the conventional Buck-Boost converter
… optimization, is utilized for the comparison of the conventional BuckBoost and Cuk converters. Detailed comparisons are made with respect to the loss and weight breakdowns. of the optimum design of the two converters for a given set of performance specifications. The comparison shows that the …
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Modeling and analysis of spacecraft battery charger systems
Large-signal analysis of various spacecraft power systems is performed to predict the bus dynamics in various modes of operation. The large-signal trajectories of the system's operating point are analyzed employing qualitative graphical representation. The analyses are verified through simulation …
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Investigation of gravitational effects on the performance of variable conductance heat pipe.
… heat pipe with a length to diameter ratio of 96 to 1 was designed and constructed. The performance characteristics of both the conventional and gas loaded variable conductance modes of operation were studied. Particular emphasis was placed upon investigating the gravitational effects in the …
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Haptic teleoperation of mobile manipulator systems using virtual fixtures.
In order to make the task of controlling Mobile-Manipulator Systems (MMS) simpler, a novel command strategy that uses a single joystick is presented to replace the existing paradigm of using multiple joysticks. To improve efficiency and accuracy, virtual fixtures were implemented with the use of a …
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Experimental investigations of oxygen-separating ion transport membranes for clean fuel synthesis
… have the potential for 100% selective separation of oxygen from air. ITMs operate at extreme temperatures (>800°C), necessary for the mobility of lattice oxygen ions: this can result in significant experimental challenges. Specifically, the local gas compositions at both the high oxygen (air) and …
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Modeling and Control Design of a Bidirectional PWM Converter for Single-phase Energy Systems
… There is a generic current loop for different modes of operation to ease the transition between different modes, including stand-alone inverter mode, grid-tied inverter mode, grid-tied rectifier mode and grid-tied charger/discharger mode. Under stand-alone mode operation, ac voltage regulation …
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Effect of Thermally Induced Deformation in a Supersonic Combustion Facility
… (CFD) solvers are used to simulate the effect of thermal deformation on the reacting flow developing within the University of Virginia (UVa) Supersonic Combustion Facility (SCF). A detailed thermal-structural model is developed to resolve the temperature distribution and the resulting …
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New positioning system for the CSL Robotics Laboratory Testbed
… following a template matching approach. Two modes of operation are implemented, Barycentric and Change of Axes. The new system is able to calculate position using the two methods, and 90% or more of the data points collected in each set lie within 0.05 units from true position. Heading is …
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Simulation of microgrid system and low-cost wireless communication network
The MATLAB/SIMULINK model of a microgrid system is presented in this thesis. The microgrid consists of a converter-fed distributed generator photovoltaic array with maximum power point tracking, a converter-fed battery storage system and a critical load which must be fed power under all …
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A DC chopper controller for a battery electric vehicle
… internal combustion engined vehicle as a form of commuter transport in city centres. To conserve battery energy as much as possible, an efficient drive system, consisting of a chopper controller and a permanent magnet motor, is described and tested in four modes of operation - two modes of …
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Modeling and design of semi-solid flow batteries
A three-dimensional dynamic model of the recently introduced semi-solid flow battery system is developed and applied to address issues with important design and operation implications. Because of the high viscosity of semi-solid flow battery suspensions, alternative modes of operation not typically …
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DC-DC converters with high efficiency over wide load ranges
… regulator is presented, including theory of operation, circuit design, and test results. This DC-DC converter introduces several novel circuits which enable more efficient operation at output powers from l00J.1W to lW. Efficiency above 80% is achieved from 500JlW to 500mW. Specifically, …
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Composite circular braid mechanics
… and tailoring the mechanical properties of these structures has become increasingly important. This thesis will examine one class of circular braids encompassing an elastic core. By hypothesizing four modes of operation and incorporating primary influences, the mechanical response of the …
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A software shell for visually impaired applications
… used for this work was an IBM PC Portable. Use of the resident software developed in conjunction with a Votrax Voice Unit can greatly simplify PC applications for the visually impaired. Further, a method to communicate with a mainframe is also presented. Almost all of the commonly used DOS …
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Hemispheric solution of the Omega equation including terrain and surface frictional effects
… 850 mb, 700 mb, 500 mb, and 300 mb for a grid of 1977 points per level covering the major portion of the Northern Hemisphere. The effects of terrain and surface frictional stress on the vertical velocity at the lower boundary are investigated in some detail and applied at the earth's surface. …
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