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 “"excitation system"”.
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Synchronous generator and excitation system response to GIC
… and potential voltage collapse. While most power system studies have focussed on the transformer's response to GIC, there has been very little research investigating the response of synchronous generators and excitation systems to such disturbances. Moreover, conventional GIC modelling assumes a …
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Design and construction of an excitation system for a superconducting alternator.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1973
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Development of a Concept for Forced Response Investigations
… the forced response campaign is to determine the system damping in the stable compressor regime. Hence a novel excitation system capable of dynamically exciting specific rotor blade modes is needed. It is aim of the present work to find a promising concept for such a system. In the present work, …
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Global Dynamic Characterization and Load Rating of Bridge Structures Utilizing Economical Dynamic Excitation Devices
… has been limited by the high cost of the excitation devices that are required for the best data quality. The objective of the research reported herein is to evaluate a low-cost excitation system for multiple-input, multiple-output (MIMO) EMA, enabling the production of accurate estimates …
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The Development of a Phase Locked Excitation Testing Method for Full‐Scale Wind Turbine Blades
… been performed by utilizing forced displacement systems. These systems do not allow for the load phase angle to be controlled, which leads to inaccurate loading distributions, when compared to actual field gathered data. The PhLEX (Phase Locked Excitation System) testing method outlined herein …
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The Development of a Phase Locked Wind Turbine Blade Finite Element Model to Predict Loads and Deflections During Fatigue Testing
… been performed by utilizing forced displacement systems. These systems do not allow for the load phase angle to be controlled, and the maximum load application in the edge and flap directions are allowed to vary. The PhLEX (Phase Locked Excitation System) under development utilizes a resonant …
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Modeling and simulation of selected distributed generation sources and their assessment
… Also, the detailed synchronous machine and the excitation system model are obtained for the standard simulation. The simulation will be performed with an infinite bus system model. The synchronous machine is connected with a local load in order to develop the terminal voltage, avoiding the …
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Enhanced Magnetic Flux Leakage Analysis of the Distribution of Flux and The Effects of Velocity of Mild Steel Plates
… a permanent magnet based magnetic flux leakage system. Both experimental and finite element analysis methods have been utilised to undertake a parametric study of the velocity effects on the induced flux and its distribution in plate thicknesses of 6mm through to 20mm thick 1020 grade steel. …
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Neutralizador dinâmico de vibrações torcionais viscoelásticos aplicado em sistemas rotodinâmicos
… used in the construction of these auxiliary systems. This doctoral thesis deals with the modeling of dynamic neutralizers applied to the problem of torsional vibrations in rotors, the final result of which is to define the viscoelastic and geometric parameters of the neutralizer, that is, in …
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Damping of electromechanical oscillations using power system stabilizers
… of electromechanical oscillations using Power System Stabilizers (PSS). The thesis focuses on three problems associated with the damping of these oscillations, namely the determination of the optimal locations of the PSS, the determination of the best control structure of the PSS and the design …
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Dynamic simulation of solid state controlled machine systems including component failures
… for simulating solid-state-controlled machine systems, including component failures within either the electronics or machine(s), is presented in detail. The capability of modeling unbalanced-machine operation is included in the modeling approach. The approach is directly amenable to computer …
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Control of sound transmission into payload fairings using distributed vibration absorbers and Helmholtz resonators
… is developed as a first approximation of the system. A modal expansion method is used to describe the behavior of the cylindrical shell and the acoustic cavity; the noise reduction devices are modeled as surface impedances. All the elements are then fully coupled using an impedance matching …
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Design and Numerical Simulation of the Real-time Particle Charge and Size Analyser
… implement and simulate a signal processing system for novel, fully functional measurement instrument capable of simultaneously measuring in real time the bipolar charge and size distribution of medical aerosols. The Particle Size and Charge Analyser (PSCA), investigated in this thesis, uses …
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Analyses of flame response to acoustic forcing in a rocket combustor
… rocket engines. The chamber features an acoustic excitation system that imposes an acoustic disturbance representative of a high frequency instability upon a cluster of five coaxial injection elements in the center of the chamber. The response of the elements to the imposed acoustic disturbance is …
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Voltage stability analysis of a power system network comprising a nuclear power plant
… enough to withstand the consequences of a power system blackout. Blackouts are defined as being a form of power system instability that can be brought about by a variety of abnormal network scenarios. The most common modes of failure are grouped under the term power system stability. In this …
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DFIG-Based Split-Shaft Wind Energy Conversion Systems
… research, a Split-Shaft Wind Energy Conversion System (SS-WECS) is investigated to improve the performance and cost of the system and reduce the wind power uncertainty influences on the power grid. This system utilizes a lightweight Hydraulic Transmission System (HTS) instead of the traditional …
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Monitoring, modeling, and hybrid simulation—an integrated Bayesian-based approach to high-fidelity fragility analysis
… estimation. This research aims to develop a systematic Bayesian-based framework to estimate high-fidelity fragility functions by integrating monitoring, modeling, and hybrid simulation, with the final goal of improving the accuracy of seismic risk assessment to support both pre- and …