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Teses / dissertações sobre o tema "Frequency stability"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Nocera, Aurelio <1994&gt. "High Frequency Trading and Financial Stability." Master's Degree Thesis, Università Ca' Foscari Venezia, 2020. http://hdl.handle.net/10579/16789.

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Over the last three decades, financial markets have undergone through an epochal revolution. The main driver of this profound change has been, as always, technology. Trading floors are not anymore full of yelling traders who shout orders from one side of the exchange to the other. People now need to adapt their mental picture of financial markets to a new representation: no more humans, only a collection of silent servers which collect and storage terabytes of data. In the first chapter, I will explore how financial markets have reached this new macro and micro organization. I will present t

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2

Ismael, Alexander. "Comparison of fast frequency reserve strategies for Nordic grid frequency stability." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-411503.

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How long would modern society cope with a power outage, what would happen to vital systems that we today take for granted in modern society. The Nordic electricity grid is facing a major shift where electricity production from non-renewable sources are to be replaced increasingly by renewable sources. By increasing the penetration of wind and solar power the electric power system might be exposed to disturbances due to decreasing inertia as a result of the electricity transition. Currently the electric power system has different reserves to use to maintain frequency stability but there are oth

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3

Saarinen, Linn. "The Frequency of the Frequency : On Hydropower and Grid Frequency Control." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308441.

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Variations in the electricity consumption and production connected to the power system have to be balanced by active control. Hydropower is the most important balancing resource in the Nordic system, and will become even more important as the share of variable renewable energy sources increases. This thesis concerns balancing of active power, especially the real-time balancing called frequency control. The thesis starts in a description of the situation today, setting up models for the behaviour of hydropower units and the power system relevant to frequency control, and comparing the models wi

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4

Dahlborg, Elin. "Grid frequency stability from a hydropower perspective." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444453.

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Many AC grids suffer from decreased frequency stability due to less system inertia. This has increased the risk of large-scale blackouts. This thesis and its papers address the frequency stability problem from a hydropower perspective. Grid frequency stability assessments often require accurate system inertia estimates. One approach is to estimate the inertia of all individual power plants and sum up the results. We implemented three inertia estimation methods on a Kaplan unit and compared their results. The generator contributed with 92-96% of the unit inertia, which verified the results from

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5

MARTINEZ, DIANA MARGARITA GARCIA. "VOLTAGE STABILITY ASSESSMENT CONSIDERING PRIMARY FREQUENCY CONTROL AND FREQUENCY-DEPENDENT LINE PARAMETERS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25603@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>A crescente demanda de energia elétrica faz com que a complexidade dos sistemas elétricos de potência seja cada vez maior, associado às limitações na expansão do sistema de transmissão, resulta na operação dos sistemas elétricos mais próximos de seus limites, tornando-os vulneráveis a problemas de estabilidade de tensão. Nesse contexto, faz-se necessário o desenvolvimento de ferramentas computacionais capazes de representar os sistemas elétri

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6

Tan, Hui Boon. "Disentangling low-frequency versus high-frequency economic relationships via regression parameter stability tests." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/38575.

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7

Hewes, Dominic [Verfasser]. "Frequency Stability in Sustainable Power Systems: Effects of Reduced Rotational Inertia on Frequency Stability in the European Transmission System / Dominic Hewes." München : Verlag Dr. Hut, 2020. http://d-nb.info/1219469866/34.

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8

Zhang, Xiao Meny. "The mutation frequency and genome stability of measles virus." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546455.

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9

Wan, Kin Wa. "Advanced numerical and digital techniques in frequency stability analysis." Thesis, University of Portsmouth, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237843.

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10

Virgilio, Gianluca. "Is high-frequency trading a threat to financial stability?" Thesis, University of Hertfordshire, 2017. http://hdl.handle.net/2299/18841.

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The purpose of this thesis is: (i) to produce an in-depth data analysis and computer-based simulations of the market environment to investigate whether financial stability is affected by the presence of High-Frequency investors; (ii) to verify how High-Frequency Trading and financial stability interact with each other under non-linear conditions; (iii) whether non-illicit behaviours can still lead to potentially destabilising effects; (iv) to provide quantitative support to the theses, either from the audit trail data or resulting from simulations. Simulations are provided to test whether High

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11

Chen, Jian. "Accurate frequency estimation with phasor angles." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-12042009-020203/.

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12

Popelář, Vojtěch. "Vliv kompenzace kabelových sítí na stabilitu blízkých zdrojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220691.

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This thesis deals with the infulence of compensation cabel network on the stability of nearby power source. This issue is topical with the increase in the ratio of cable networks 110 kV in large cities. The work examines the theoretical concept of stability and factors that affect it. Mainly discusses the stability angle rotor of a synchronous machina. The practical part is performed in MODES software, that performs dynamic simulation of the behavior of the model. In this case, it will be behavior of synchronous machine during short-circuit in network at different values of compensation of thi

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13

Davies, Guy R. "Investigating the low-frequency stability of BiSON's resonant scattering spectrometers." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1609/.

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The main focus of the thesis is the study of low-degree low-frequency solar p modes from the analysis of high-resolution power spectra generated from 20 years of high-quality data collected by the Birmingham Solar Oscillations Network (BiSON) Resonant Scattering Spectrometers (RSS). To that end we present a novel model of the RSS and its observations that allows for the determination of a significant improvement in calibration for ground-based Sun-as-a-star Doppler velocity observations. We show that the previously neglected multiple scattering in the RSS vapour cell is significant and demonst

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14

MOSCA, CARMELO. "Methodologies for Frequency Stability Assessment in Low Inertia Power Systems." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2895393.

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15

Xizhou, Zhang, and Yao Jun. "Analysis of Frequency Stabilization and Modulation of Airborne Telemetry Transmitter." International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/608850.

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International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper analyzes the feature of frequency stability and modulation of airborne telemetry transmitters. According to the characteristic of telemetry information transmission, several methods for frequency stabilization and modulation are briefly compared. Emphasis is given to discuss frequency dividing phase- locked frequency modulation and on-off keying modulation and FM/on- off keying double modulation. With the view of raising frequency stability and m

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16

Qureshi, Fassahat Ullah. "Fast frequency response services for low inertia power systems." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20764.

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Power systems in the world are undergoing a major transformation due to the displacement of conventional synchronous generators (SGs) and increasing penetration of non-synchronous renewable energy sources (NS-RES) in the electricity grids. A computationally efficient analytical tool incorporating FFR services to determine the frequency performance of a low synchronous inertia power system is a major contribution of this thesis. First, we study the impact of high penetration of NS-RES on the frequency stability of the electricity grids. Second, we study the impact of reduced synchronous inertia

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17

Diederichs, Benedikt [Verfasser], and Armin [Akademischer Betreuer] Iske. "Sparse Frequency Estimation : Stability and Algorithms / Benedikt Diederichs ; Betreuer: Armin Iske." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1175584649/34.

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18

Diederichs, Benedikt Verfasser], and Armin [Akademischer Betreuer] [Iske. "Sparse Frequency Estimation : Stability and Algorithms / Benedikt Diederichs ; Betreuer: Armin Iske." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:18-95079.

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19

Schwarzbach, Christoph. "Stability of finite element solutions to Maxwell's equations in frequency domain." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:bsz:105-24780.

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Eine Standardformulierung der Randwertaufgabe für die Beschreibung zeitharmonischer elektromagnetischer Phänomene hat die Vektor-Helmholtzgleichung für das elektrische Feld zur Grundlage. Bei niedrigen Frequenzen führt der große Nullraum des Rotationsoperators zu einem instabilen Lösungsverhalten. Wird die Randwertaufgabe zum Beispiel mit Hilfe der Methode der Finiten Elemente in ein lineares Gleichungssystem überführt, äußert sich die Instabilität in einer schlechten Konditionszahl ihrer Koeffizientenmatrix. Eine stabilere Formulierung wird durch die explizite Berücksichtigung der Kontinuität

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20

Osborn, Christopher Eric. "Protection, Automation, and Frequency Stability Analysis of a Laboratory Microgrid System." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1828.

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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. T

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21

Hamza, Haval Rawf. "The impacts of high-frequency trading on the financial markets’ stability." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1428416050.

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22

Garmroodi, Doiran Mehdi. "Sensitivity Analysis for Future Grid Stability Studies." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15978.

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The increasing penetration of converter-interfaced generators (CIGs) has raised concerns about the stability and security of future grids (FGs). These resources affect power systems dynamics in many ways including reducing system inertia, interacting with existing generators, changing power flow paths, etc. In this thesis, we carry out a sensitivity study to explore the structural impacts from CIGs on the damping and frequency stability of power systems. Initially, we study the impact of the intermittent power from wind turbine generators (WTGs) on the damping of the electromechanical oscillat

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23

Andersson, Oskar. "Inclusion of Wind Turbines into Frequency Support Services : Exploring frequency stability issues and comparing regulation power market products." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435076.

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There is a trend in Sweden towards increasing the electricity production from renewable energy sources in the electric grid. The increased share of renewables could be seen as essential for Sweden to be able to meet the obligated climate goals. Integration of renewables will enable Sweden to be a progressive part in reducing greenhouse gases and decreasing the global warming. However, one issue with renewable energy sources is the inverter governed production. This, together with the decommission of larger synchronous generators, results in decreasing the inertia and increasing the instability

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24

Herman, Gregory S. "Terahertz Local Oscillator Via Difference Frequency Generation in III-V Semiconductors Using Frequency Stabilized Lasers." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/306995.

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Terahertz (THz) heterodyne receiver systems are required by NASA to monitor gas concentrations related to the Earth's ozone depletion. To this end, NASA needs compact, solid state, tunable THz local oscillators. THz LOs have been developed using three means: 1) All-electronic LOs using mixers in combination with Gunn oscillators, 2) Hybrid Photo-electronic LOs using a cw analog of the Auston switch, and 3) All-photonic THz LOs using coherent sources, such as vapor lasers or solid-state Quantum Cascade Lasers, and down converting lasers using nonlinear crystals. In this dissertation, we beg

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25

Háněl, Petr. "Měření frekvenční stability oscilátorů v časové oblasti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220360.

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The thesis focuses on measurements of oscillators’ frequency stability. The theoretical part describes the basic concepts of measurement of frequency, measuring systems and measurement errors. The second part of thesis describes the design of measurement system. The design contains all data for build prototype and software, including all source codes.

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26

Liljeblad, Jonathan F. D. "Biomimetic Membranes: : Molecular Structure and Stability Studies by Vibrational Sum Frequency Spectroscopy." Licentiate thesis, KTH, Surface and Corrosion Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24465.

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<p>In the research presented in this licentiate thesis the surface specific technique Vibrational Sum Frequency Spectroscopy, VSFS, combined with the Langmuir trough has been utilized to investigate Langmuir monolayers and Langmuir-Blodgett (LB) deposited mono- and bilayers of phospholipids. Their molecular structure, stability, and hydration were probed to gain additional understanding of important properties aiming at facilitating the use of such layers as model systems for biological membranes.</p><p>VSFS was applied to <em>in situ</em> studies of the degradation of Langmuir monolayers of 1

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27

Laury, John. "Transient Stability in Low Frequency Railways with Mixed Electronic and Rotational Generation." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26485.

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Transient stability concerns the ability of a power system to maintain synchronism after a large disturbance. Transient stability plays an important role in guaranteeing operational security and reliability and has been extensively studies for large 50 Hz and 60 Hz transmission systems. However, transient stability of low frequency railway grids has not been properly investigated.As low frequency railway grids operate at another frequency than the public grid, conversion of frequency is needed. This conversion is performed by Rotary Frequency Converters or by Static Frequency Converters. These

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28

Warren, Lauren Half Hartmann Marilyn Dina. "Comparing the frequency, overlap, stability, and predictive utility of preclinical dementia constructs." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,739.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2007.<br>Title from electronic title page (viewed Dec. 18, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Psychology." Discipline: Psychology; Department/School: Psychology.

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Brighty, Christopher Charles. "An investigation into the frequency stability of non-oven controlled crystal oscillators." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303036.

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30

Jiangnan, Xi. "Frequency Stability Analysis of the Nordic Power Systemwith New Hydropower Governor Settings." Thesis, KTH, Elektriska energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-179143.

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The Nordic power system is under continuous development. New productionsources and loads are installed at a high rate and old ones are taken out of operation.This development gradually alters the power system dynamics. The NordicTransmission System Operators (TSOs) have observed that the frequency qualityis gradually decreasing and recognized a number of reasons for this. Theautomatic frequency containment reserve (FCR-N) is in place to keep the electricfrequency within the interval 50 +/- 0.1 Hz during normal operation. Thisfunction is mainly provided by a number of hydropower plants where th

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Rosado, Sebastian Pedro. "Voltage Stability and Control in Autonomous Electric Power Systems with Variable Frequency." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29616.

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This work focuses on the safe and stable operation of an autonomous power system interconnecting an AC source with various types of power electronic loads. The stability of these systems is a challenge due to the inherent nonlinearity of the circuits involved. Traditionally, the stability analysis in this type of power systems has been approached by means of small-signal methodology derived from the Nyquist stability criterion. The small-signal analysis combined with physical insight and the adoption of safety margins is sufficient, in many cases, to achieve a stable operation with an acceptab

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Aramane, Pranav. "Stability Analysis and Design of a Tracking Filter for Variable Frequency Applications." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/117.

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The work presented in this thesis is a frequency adaptive tracking filter that can be used in exact tracking of power frequencies and rejection of unwanted harmonics introduced during power disturbances. The power synchronization process includes power converters and other equipment that have many non-linear components that introduce unwanted harmonics. This new design is motivated by the requirement of a filter that can filter all the harmonics and exactly track a rapidly varying fundamental frequency with little time delay and phase error. This thesis analyzes the proposed filter mathematica

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Obradovic, Danilo. "Coordinated Frequency Control Between Interconnected AC/DC Systems." Licentiate thesis, KTH, Elkraftteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280156.

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With ambitions of reducing the environmental pollution, power systems integrate larger shares of Renewable Energy Sources (RES) to phase out conventional thermal and nuclear generators. Since RES (such as wind and solar power) are connected to the grid through power electronics devices, they do not inherently contribute to system inertia. With decreasing inertia, the Instantaneous Frequency Deviation (IFD), which follows a power unbalance, is significantly impacted. Frequency Containment Reserves (FCR) are designed to provide a fast dynamic response, counteract power imbalances and stabilize t

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Sharma, Abhinav. "ESTIMATING THE EFFECTS OF BLASTING VIBRATIONS ON THE HIGH-WALL STABILITY." UKnowledge, 2017. https://uknowledge.uky.edu/mng_etds/38.

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The stability of the high-walls is one of the major concerns for open pit mines. Among the various factors affecting the stability of high-walls, blast vibrations can be an important one. In general, worldwide the established respective government regulations and industry standards are used as guidance to determine the maximum recommended levels of the peak particle velocity and frequency from the blast to avoid any effects on the structures around the mining project. However, most of the regulations are meant for buildings or houses and do not concern high-walls. This thesis investigates the

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35

Omer, Khaled A. E. "An in-vitro evaluation of resonant frequency analysis to measure fixed bridge stability." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.570458.

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Conventional fixed bridge prostheses may fail due to one or more loose retainers, which may be difficult to diagnose. An objective and reproducible investigation to identify, at an early stage, loosening of a retainer could be of significant benefit. The aims of the current series of investigations were to record retrospectively the clinical performance of different types of conventional fixed prostheses used to replace missing teeth and to determine whether Resonance Frequency Analysis (RFA) was capable of measuring bridge stability, in-vitro. One hundred and twenty two patients with 168 brid

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36

Martínez, Sanz Inmaculada. "Control of AC/DC systems for improved transient stability and frequency support provision." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25956.

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In this thesis, control of future AC/DC systems for improved system dynamic performance is studied. The objective is to determine mechanisms for providing AC network services (e.g. frequency support, damping, etc.) through coordinated control of HVDC power converters and FACTS devices while considering increased levels of wind generation. In particular, this work addresses some of the concerns associated with the stability of the future Great Britain (GB) transmission network as it evolves to support low carbon generation scenarios and the use of DC grids to integrate offshore renewable resour

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FERRARI, MASSIMO. "FINANCIAL STABILITY AND UNCONVENTIONAL POLICIES." Doctoral thesis, Università Cattolica del Sacro Cuore, 2017. http://hdl.handle.net/10280/35715.

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This thesis explores the relation between fiancial stability and macroeconomic policy. The first chapter tackles the topic of financial stability from the point of wiev of a the single bank. In that model banks take explicitly into account the probability of default of their counterparties on the interbank market. In this way, an endogenous constraint to the credit supply is defined. That constraint evolves along the business cycle. I show that monetary policy alone is not able to ease credit conditions during a crisis. The second chapter nests a complex network model inside a state-of-the-art

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FERRARI, MASSIMO. "FINANCIAL STABILITY AND UNCONVENTIONAL POLICIES." Doctoral thesis, Università Cattolica del Sacro Cuore, 2017. http://hdl.handle.net/10280/35715.

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This thesis explores the relation between fiancial stability and macroeconomic policy. The first chapter tackles the topic of financial stability from the point of wiev of a the single bank. In that model banks take explicitly into account the probability of default of their counterparties on the interbank market. In this way, an endogenous constraint to the credit supply is defined. That constraint evolves along the business cycle. I show that monetary policy alone is not able to ease credit conditions during a crisis. The second chapter nests a complex network model inside a state-of-the-art

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39

Hou, Aili. "Analysis of the deflections, vibrations, and stability of leaning arches." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/45088.

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<p>In recent years, leaning arches have been used in frameworks for some tent structures. Various people have studied the behavior of a single vertical arch; however, only a few researchers have considered the three-dimensional behavior of arches and leaning arches. The objective of this thesis is to analyze the three-dimensional nonlinear behavior of leaning arches, particularly the load-deflection and load-frequency relationships, and to provide a basis for future design guidelines. In this study, vertical arches of different shapes and load combinations are analyzed in order to compa

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Showers, Obu Samson. "Enhanced frequency regulation functionality of grid-connected PV system." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/3070.

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Thesis (MEng (Electrical Engineering))--Cape Peninsula University of Technology, 2019<br>Electric utilities are confronted with challenges like rising fuel costs, aging equipment, increasing energy demand, frequency regulation and the difficulty to integrate renewable energy resources into the grid. The presence of photovoltaic (PV) penetration on the utility grid is also increasing significantly in recent years. With the recent rise in PV penetration and the advancement of the global PV industry, there is an urgent and a necessary need to introduce features in PV systems that will make them r

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Askari, Behrooz. "An advanced frequency-domain code for boiling water reactor (BWR) stability analysis and design /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17720.

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Grgic, Biljana. "Influence of the impeller and tank geometry on low-frequency phenomena and flow stability." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ34369.pdf.

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Eklund, Anders. "Microwave Frequency Stability and Spin Wave Mode Structure in Nano-Contact Spin Torque Oscillators." Doctoral thesis, KTH, Integrerade komponenter och kretsar, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188546.

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The nano-contact spin torque oscillator (NC-STO) is an emerging device for highly tunable microwave frequency generation in the range from 0.1 GHz to above 65 GHz with an on-chip footprint on the scale of a few μm. The frequency is inherent to the magnetic material of the NC-STO and is excited by an electrical DC current by means of the spin torque transfer effect. Although the general operation is well understood, more detailed aspects such as a generally nonlinear frequency versus current relationship, mode-jumping and high device-to-device variability represent open questions. Further appli

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Ung, Niklas. "The effects of backlash on the frequency stability in a hydro based power system." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235268.

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The generated and consumed power should always be in balance in a power system. Any energy from a power imbalance will be stored as kinetic energy in the system's rotating mass leading to a changed frequency. To keep the frequency within acceptable limits hydropower plants are used to counteract power imbalances. The hydropower plants are however introducing a nonlinearity, namely backlash. This complicates the behavior of the system, e.g. a limit cycle behavior can arise. A limit cycle is a standing oscillation and will force the system to move away from what is desired. Oscillations will ca

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Thompson, Fiona Hilary. "Changing flood frequency in Scotland : implications for channel geomorphology, ecology and management." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9667.

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The effect of climate on the fluvial system has long been investigated due the significant impact it can have on a river’s hydrological regime and fluvial processes. In recent years this interest has increased as global changes in climate are expected to bring more frequent high magnitude flood events globally and to North West Europe in particular. Despite the knowledge that the frequency and magnitude of floods is to increase, less is known about the geomorphological implications of this for river channels and where channel instability is likely to occur at both the river network and nationa

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Emami, Tooran. "A bridge from stability to robust performance design of PID controllers in the frequency domain." Diss., Wichita State University, 2009. http://hdl.handle.net/10057/2560.

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A graphical technique for finding proportional integral derivative (PID) controllers that stabilize a given single-input-single-output (SISO) linear time-invariant (LTI) system of any order system with time-delay has been solved. In this research, a method is introduced for finding all achievable PID controllers that also satisfy an H sensitivity, complementary sensitivity, weighted sensitivity, robust stability, or robust performance constraint. These problems can be solved by finding all PID controllers that simultaneously stabilize the closedloop characteristic polynomial and satisfy const

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Perera, Sam Prasanna Kurukulasuriya, and Sumith Ruwan Dharmasiri Kachchakaduge. "SMART VAR Generator to Manage Grid Voltage Stability issue of Low Frequency Switching Photovoltaic Inverters." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-20595.

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Solar power, clean and abundant, is considered as a vital contributor in the effort of transforming world energy-mix to pollution-free and natural-regenerative sources. The solar micro inverters have gained greater visibility during the past several years due to their higher efficiency, greater performances, longer life expectancy and many other benefits. But, integrating small scale [<15kW] renewable energy sources, especially the low frequency switching solar inverters to the low voltage distribution grid has its own challenges due to their inability to generate reactive power to mainta

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Sjölund, Maria. "Development and Stability of Antibiotic Resistance." Doctoral thesis, Uppsala University, Clinical Bacteriology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4523.

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<p>Antibiotic resistance is of current concern. Bacteria have become increasingly resistant to commonly used antibiotics and we are facing a growing resistance problem. The present thesis was aimed at studying the impact of antibiotic treatment on pathogenic bacteria as well as on the normal human microbiota, with focus on resistance development.</p><p>Among the factors that affect the appearance of acquired antibiotic resistance, the mutation frequency and biological cost of resistance are of special importance. Our work shows that the mutation frequency in clinical isolates of <i>Helicobacte

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Zhang, Yang. "Design of wide-area damping control systems for power system low-frequency inter-area oscillations." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/y_zhang_112007.pdf.

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Fioravanti, André. "H∞ analysis and control of time-delay systems by methods in frequency domain." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00627352.

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This thesis addresses the H∞ analysis and control of continuous commensurate time-delay systems by frequential methods. First, the asymptotic behavior of the chains of poles are studied, and the conditions of stability for neutral systems with poles approaching the imaginary axis are given. The same analysis is done for fractional systems. In the sequel, a numerical method able to locate all the stability windows as well as the unstable root-locus for classical and fractional system is given. We conclude the analysis part by providing the stability crossing curves of a class of distributed del

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