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Thèses sur le sujet « Dynamic rating »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 7 février 2022

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1

Dang, Huong Dieu. "Rating History, Time and The Dynamic Estimation of Rating Migration Hazard." University of Sydney, 2010. http://hdl.handle.net/2123/6397.

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Doctor of Philosophy(PhD)<br>This thesis employs survival analysis framework (Allison, 1984) and the Cox’s hazard model (Cox, 1972) to estimate the probability that a credit rating survives in its current grade at a certain forecast horizon. The Cox’s hazard model resolves some significant drawbacks of the conventional estimation approaches. It allows a rigorous testing of non-Markovian behaviours and time heterogeneity in rating dynamics. It accounts for the changes in risk factors over time, and features the time structure of probability survival estimates. The thesis estimates three stratif

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Huang, Rui. "Dynamic rating for improved operational performance." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387369/.

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Many power transmission systems are under pressure from increasing load demand as well as changes in power flows due to the evolution of the power market and the integration of renewable energy generations. At the same time, limited finance for installing new cables and the difficulties in reinforcement of existing circuits in urban areas incentivize transmission operators around the world to find ways to maximize the flexibility and usage of their existing transmission network. As a result, it is crucial to adopt new current rating methods which are able to optimize asset utilization, minimiz

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Kitimbo, Andrew. "Rating of Power Cables for Dynamic Load Situations." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195113.

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Huvudsyftet med detta projekt var att utvärdera möjligheten att använda metoder för ”dynamic rating” för att dimensionera (trekärniga) strömkablar som ansluter havsbaserade vindkraftparker. Flera publikationer från kabelindustrin visar att de metoder för att beräkna armeringsförluster som föreslås av IEC för (trekärniga) strömkablar är väldigt konservativa. Målet med projektet var att utveckla mer precisa modeller för att uppskatta armeringsförluster på ett mindre konservativt sätt. Kabelmodeller utvecklades och simulerades under vanliga installations- och miljövillkor. Modeller validerades me

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Teh, Jiashen. "Analysis of dynamic thermal rating system of transmission lines." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/analysis-of-dynamic-thermal-rating-system-of-transmission-lines(f1383776-65e6-4584-8c0f-5cc753ae0d98).html.

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There is a general consensus worldwide for a need to increase the capacities of transmission lines by not physically altering the transmission structures. Amidst this challenge, dynamic thermal rating (DTR) system appears as an appropriate option. Besides that, many countries have also pledged to integrate wind energy sources into their power networks. Taking these as motivations, the purpose of this thesis is to carry out the reliability analysis of DTR system for transmission lines. The two main standards - IEEE 738 and CIGRE, use for calculating the line rating of overhead lines has been an

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Molina, Gómez Andrea. "Improved planning of wind farms using dynamic transformer rating." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287175.

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Due to the increase in electrical demand and renewable penetration, electrical utilities need to improve and optimize the grid infrastructure. Fundamental components in this grid infrastructure are transformers, which are designed conservatively on the base of a static rated power. However, load and weather change continuously and hence, transformers are not used in the most efficient way. For this reason a new technology has been developed: Dynamic transformer rating (DTR). By applying DTR, it is possible to load transformers above the nameplate rating without affecting their life time expect

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6

Singh, Narender. "Feeder Dynamic Rating Application for Active Distribution Networks using Synchrophasors." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187665.

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There is an ever increasing demand of electricity and to meet this demand, installation of new transmission and distribution lines is required. This task requires a significant investment and consent from the respective authorities. An alternative is to utilize maximum capability of the existing lines. Static line ratings are based on a conservative estimate, which means that on most occasions, the actual capacity of lines is much higher than the static line ratings. In order to provide a solution to this problem, this thesis introduces an approach that has been developed to utilize real time

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Svedberg, Sebastian. "Framtidens smartare elnät - en beskrivning av smarta elnät och dynamic rating." Thesis, KTH, Elektroteknisk teori och konstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152525.

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Smarta elnät är en av lösningarna för att uppnå EUs klimatmål den s.k. 20-20-20-satsningen. Klimatmålen innefattar bl.a. ökad energiproduktion från förnybara energikällor och ökad energieffektivisering, detta anses nödvändigt för att hindra den globala uppvärmningen samt uppnå en bättre och mer hållbar framtid. Den elektriska energins svaghet är den begränsade möjligheten till effektiv och storskalig lagring. Eftersom den förnybara energin har en väderberoende produktion ska smarta elnät hjälpa konsumenten att styra energikonsumtionen efter hur energiproduktionen varierar. Det finns planer p

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Ariza, Rocha Oscar David. "Dynamic transformers rating for expansion of expansion of existing wind farms." Thesis, KTH, Elektroteknisk teori och konstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-256531.

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Distribution system operators face the challenge to connect users rapidly to the grid and the opportunity to reduce costs for new connections. A method to enhance network operation and planning is dynamic transformer rating (DTR), which considers load and temperature variations to increase the rating of the transformer while maintaining in safe operation. This project investigates DTR application to an existing population of transformers connected to a wind park and proposes a method for adding new turbines to the grid using installed transformers. Five transformer locations and nine units bel

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Dahlgren, Linus. "Case Study on Applications of Measurement Equipment for Dynamic Line Rating." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284242.

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Dynamic Line Rating is the concept of rating the ampacity of power lines depending on the thermodynamicconditions of the lines. It is an alternative to Static Line Ratings, which are set to maintainnetwork safety requirements under unfavourable operating conditions. Thus Dynamic Line Rating allowsthe network operator to utilise unused capacity of the lines, and operate network assets closer to theirlimits while still maintaining network safety requirements.This thesis explores the potential of Dynamic Line Rating through an analysis of a pilot project fromEllevio AB and Heimdall Power. The goa

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Jaroo, Amer S. "Bridge Load Rating Using Dynamic Response Collected Through Wireless Sensor Networks." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1391692831.

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Morozovska, Kateryna. "Dynamic Rating of Power Lines and Transformers for Wind Energy Integration." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226564.

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Dynamic Rating (DR) is usually associated with unlocking the capacity of power lines and transformers using available information on weather conditions. Our studies show that Dynamic Rating is a broad concept that requires further study and development. The capacity of the majority of power devices is highly dependent on the heat transfer properties of the materials which the devices are made of. To ensure correct power limits of the equipment, one must take into consideration not only the power load, but also ambient conditions, such as: temperature, wind speed, wind direction, solar irradiat

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Doban, Nicolae. "Building predictive models for dynamic line rating using data science techniques." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187812.

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The traditional power systems are statically rated and sometimes renewable energy sources (RES) are curtailed in order not to exceed this static rating. The RES are curtailed because of their intermittent character and therefore, it is difficult to predict their output at specific time periods throughout the day. Dynamic Line Rating (DLR) technology can overcome this constraint by leveraging the available weather data and technical parameters of the transmission line. The main goal of the thesis is to present prediction models of Dynamic Line Rating (DLR) capacity on two days ahead and on one

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Fonseca, Marco Filipe Matos da. "Integrating wind generation in the distribution network." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8187.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do Grau de Mestre em Energias Renováveis – Conversão Eléctrica e Utilização Sustentáveis<br>One of the current challenges the electricity grid has is to actively connect future generation to its network without the need to fully reinforce it. This dissertation will study the use of dynamic ratings on overhead lines to increase its capacity and thus defer major investment on infrastructure reinforcement. The amount of current an overhead line can withstand in a given time is defined by th

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Amaral, Marcelo Francisco. "Integration of Dynamic Line Rating within a Risk-Based Security Assessment Framework." Thesis, Uppsala universitet, Industriell teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-337880.

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The following work applies Dynamic Line Rating (DLR) to a Risk-Based SecurityAssessment (RBSA) methodology with the ultimate goal to perform day-aheadforecastanalysis. DLR quantifies transmission capacities of overhead lines whilst beingdependent on ambient conditions. It takes into account variations in its surroundings,therefore making DLR less conservative compared to the traditional worst-casescenario oriented Static Line Rating (SLR). Applying DLR to overhead transmissionlines (OHLs) entails different spans of potential benefits for solving grid exhaustionproblems due to crescent electric

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Dupin, Romain. "Prévision du Dynamic Line Rating et impact sur la gestion du système électrique." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM021/document.

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Le Dynamic Line Rating est la modification dynamique des contraintes de courant sur une ligne électrique aérienne, en accord avec la météorologie. De telles modifications permettent alors d’avoir des réductions des phénomènes de congestion près de 99% du temps.De manière similaire aux énergies renouvelables, il est possible de générer des prévisions de ces contraintes modifiées, en accord avec des observations historiques, des prévisions météorologiques et des méthodes d’intelligence artificielle.Dans cette thèse, nous proposons le développement de modèles de prévision probabilistes à court te

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Karlsson, Rikard. "Power system performance when implementing dynamic rating on a wind farm connected transformer." Thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215949.

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In this study, dynamic transformer rating (DTR) is applied on a medium power transformer thatis in use in the regional transmission grid. The transformer’s rated apparent power is 63 MVA, itis connected between a wind farm at 22kV and the grid, K¨orsb¨arsdalen, at 135kV. Power systemanalysis are carried out on the grid, with the objective to test how DTR and increased wind poweraffects the grid performance with respect to reliability, voltage stability and active losses.Historical measurements of ambient temperature and transformer loading is used to calculatefree transformer capacity based on

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Wicks, John A. "An efficiency rating tool for process-level VHDL behavioral models." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151205/.

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SIMAO, ANNA ROSA ALUX. "A DYNAMIC EVOLUTIONARY GAME BETWEEN DEBT ISSUERS AND CREDIT RATING AGENCIES: A THEORETICAL VIEW." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25866@1.

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PETRÓLEO BRASILEIRO S. A.<br>Utilizando o instrumental da teoria dos jogos evolucionários, a proposta desta dissertação é analisar as interações entre emissores de dívida e agências de avaliação de risco de crédito em um ambiente com assimetria de informação. Enquanto os primeiros precisam das notas emitidas pelas agências para acessar fontes de financiamentos no mercado, as agências são remuneradas pela prestação desse serviço. Os resultados mostram que, de forma geral, quando o número de emissores grau de investimento é pequeno, incentiva-se a adoção de uma estratégia pouco transparente de d

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Jones, Laurence. "The credit rating industry under new regulatory regimes : the case of financial institutions." Thesis, Bangor University, 2019. https://research.bangor.ac.uk/portal/en/theses/the-credit-rating-industry-under-new-regulatory-regimes(86afd105-d094-431e-b345-1e9db149cb46).html.

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The dominant role of credit ratings, along with the failure of important FIs, exacerbated the 2008 crisis and caused further damage to European economies, which highlighted the need for effective regulation to prevent a reoccurrence. This thesis investigates the effect of EU and US recent regulatory reforms of the rating industry on the quality of credit ratings of financial institutions (FIs), as well as the impact of the new EU financial regulatory initiatives on the performance of FIs. The first empirical Chapter focuses on the EU reforms of credit rating agencies (CRAs) and provides eviden

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VILLANEUVA, MARIA BEATRIZ G., YASUHIRO TAKEUCHI, SHOKO ANDO, et al. "Effects of asymmetric dynamic and isometric liftings on strength/force and rating of perceived exertion." Thesis, Taylor & Francis, 1996. http://hdl.handle.net/2237/16694.

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Stefanou, Christos. "Investigation of the effect of moisture in transformers on the aging of the solid insulation for dynamic rating applications." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235267.

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In the present thesis an investigation is performed for the effect of moisture contenton the aging of the solid insulation for transformers that are dynamically loaded. Theinvestigation is based on a theoretical analysis and a model.First, a literature review is conducted on the basics of transformer operation, transformerinsulation and moisture in oil-paper systems. Furthermore, a model is developedbased on moisture equilibrium curves created by Oommen and MIT, moisture diffusionprocesses in oil-paper insulation systems and calculations for the aging of cellulose insulationfrom IEC 60076-7. T

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Lindberg, Elisabeth. "The overhead line sag dependence on weather parameters and line current." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168528.

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As the demand for energy increases, as well as the demand for renewable energy, Vattenfall, as network owner, receives many requests to connect new wind power to the grid. The limiting factor for how much wind power that can be connected to the grid is in this case the maximum current capacity of the overhead lines that is based on a line temperature limit. The temperature limit is set to ensure a safety distance between the lines and the ground. This master thesis project is a part of a research project at Vattenfall Research and Development that is examining the possibilities of increasing t

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Merante, Marco. "Application of dynamic rating to improve transportation capability of the power systems connected to wind power plants." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200930.

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Current flow in the electrical grid is changing due to the introduction of new generators and loads.Specifically, weak Overhead lines, are a constraint for the introduction of wind farms located farfrom the central network. The current situation requires smart solutions to improve the transportationcapabilities of these grid’s components. Among the different possibilities, Dynamic Line Rating(DLR), is emerging as the most interesting solution from both the economic and technical points ofview. The presented Thesis work investigates the performance of DLR from both the theoretical andpractical

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Kim, Yeonsu. "Probabilistic Estimation of River Discharge Considering Channel Characteristics Uncertainty with Particle Filters." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180482.

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Talpur, Saifal. "Dynamic line rating implementation as an approach to handle wind power integration : A feasibility analysis in a sub-transmission system owned by Fortum Distribution AB." Thesis, KTH, Elektroteknisk teori och konstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123370.

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Based on conventional static line rating method, the actual current carrying capability of overheadconductors cannot be judged. Due to continuous increment in electricity demand and the difficultiesassociated with new line constructions, the overhead lines are therefore required to be rated based on amethod that should establish their real-time capability in terms of electricity transmission. The methodused to determine the real-time ampacity of overhead conductors not only can enhance their transmissioncapacity but can also help in allowing excessive renewable generation in the electricity ne

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Hu, Xiaolong. "Impact of climate change on power systems." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/impact-of-climate-change-on-power-systems(2132a62f-afa2-4d91-8381-5ec8643b97b4).html.

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The global mean surface temperature rise was observed in the past century and proved the warming of the earth climate system. Global warming is believed to continue into the next decades due to unprecedented increases in greenhouse gas emissions. As a consequence of global warming, extreme weather scenarios are also expected to occur more frequently. In such a context, it is of vital importance to assess the impacts of climate change on the operational performance of power systems. This thesis investigates the impacts of climate change on the operational performance of power systems. The futur

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Píč, Karel. "Webová aplikace pro hodnocení kvality obrazu a videa." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399186.

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This work will be a web application for image and video quality assessment, especially those with a high dynamic range (HDR). The metrics are used for the evaluation, the results of which will be used for scientific purposes. Broader public citizens will be acquainted with this issue. This app will have an assistant available for a simple understanding of the whole application. The application also tries to be autonomous and dynamic. For example, new metrics can be added from the administration environment and editing on the server side is not required. The administrator will be able to upload

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Hahne, Linnea. "Studie över klimatförändringars påverkan på dynamisk ledningskapacitet." Thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445456.

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The thesis aims to examine the impact of climate change on line rating and to investigate the possibility of a potential increase of capacity of an overhead line. The line rating of an overhead line determines how much current can be transmitted in the line. The weather parameters which affect the line rating are ambient temperature, solar radiation, wind speed, and wind direction. If the line rating is adapted to weather conditions, it is important to be able to predict how the weather will change in the future. Therefore, the impact of climate change on weather parameters is investigated. Th

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Kazerooni, Ali Khajeh. "Methodologies and techniques for transmission planning under corrective control paradigm." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/methodologies-and-techniques-for-transmission-planning-under-corrective-control-paradigm(16d20003-4175-4405-8d9f-78fb7b138c88).html.

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Environmental concerns and long term energy security are the key drivers behind most current electric energy policies whose primary aim is to achieve a sustainable, reliable and affordable energy system. In a bid to achieve these aims many changes have been taking place in most power systems such as emergence of new low carbon generation technologies, structural changes of power system and introduction of competition and choice in electricity supply. As a result of these changes, the level of uncertainties is growing especially on generation side where the locations and available capacities of

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Naim, Wadih. "Study of The Effect of Convective Heat Transfer on Cooling of Overhead Line Conductors Based on Wind Tunnel Experimental Results." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235197.

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It is important to keep an overhead power line within rated operating conditions. Thus,an accurate prediction of the conductor's thermal and electrical behavior leads to an increasein reliability and eciency. Under DLR operation, the current rating is adjustedbased on ambient weather and solar conditions to allow for dynamic line loading. Therating adjustment takes into account the cooling mechanisms acting on the conductor. Inthis thesis, cooling by means of convective heat transfer is studied based on wind tunnelexperimental measurements of three dierent conductor samples. Convection contrib

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Cong, Yuhang. "Synchronized measurement technology supported operational tripping schemes." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/synchronized-measurement-technology-supported-operational-tripping-schemes(7d472659-d352-4291-96fc-fce7e6ce5fc8).html.

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The increasing volume of renewable and intermittent generation that is being connected to power systems means that system operators need more advanced dynamic control tools to manage the increase in congestion and the resulting pressure on system constraints. The introduction of synchronised measurement technology provides the wide area real-time measurements that are essential to develop and implement adaptive online solutions for current network issues. The objective of the research presented in this thesis is to design intelligent system integrity protection schemes (SIPS) that protect tran

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Gustafsson, Patrik. "Design of Experimental Setup for Investigation of Effect of Moisture Content on Transformer Paper Ageing during Intermittent Load." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232187.

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In this project an experimental setup is designed to investigate the effect of intermittent load patterns in combination with moisture content on cellulose ageing. It is done by exposing groups of samples to different intermittent load patterns with varying frequency. A literature review is done on transformer insulation system and cellulose degradation. Various technical solutions to different aspects of the experimental design are reviewed. The final experimental setup is explained with the primary focus being on the hardware and programming of the controlling system. The controlling system

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Kou, Jianming. "Empirical studies of credit rating and spread dynamics." Thesis, University of Reading, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494791.

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This thesis concentrates on the empirical analysis of credit ratings and credit spreads. In four relatively independent chapters, we look at the predicting power of yield spread implied ratings, Markov property of credit ratings and the dynamics of yield spreads. In the first chapter, we develop an implied rating for a large dataset of Eurobonds based on their yield spreads, taking into account the term structure effect and the time-varying spread levels. Our analysis shows that spread implied ratings and the time-varying spread levels. Our analysis shows that spread implied ratings are able t

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Hirani, Pranav. "Dynamic models of credit ratings and default probabilities." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5998.

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Thesis (M.A.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 17, 2008) Includes bibliographical references.

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Galta, Morten, and Anders Ruud Sæthre. "Dynamics of Debt Structure and Credit Ratings." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for industriell økonomi og teknologiledelse, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24778.

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Using a comprehensive dataset comprising 1 863 unique U.S. firms as well as 100unique Norwegian companies in the period 2006 - 2011, we examine the dynamicsbetween corporate debt structure and credit ratings. We address especially threeconcerns related to credit ratings and their effects on debt structure decisions: Wefirst identify the effects of bond market participation, measured by having a creditrating, before we emphasize the effects of being near a change in credit rating.Last, we address how credit ratings affect corporate debt maturity structure. Theseconsiderations form the foundatio

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Yang, Yi. "Power line sensor networks for enhancing power line reliability and utilization." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41087.

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Over the last several decades, electricity consumption and generation have continually grown. Investment in the Transmission and Distribution (T&D) infrastructure has been minimal and it has become increasingly difficult and expensive to permit and build new power lines. At the same time, a growing increase in the penetration of renewable energy resources is causing an unprecedented level of dynamics on the grid. Consequently, the power grid is congested and under stress. To compound the situation, the utilities do not possess detailed information on the status and operating margins on their

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Posch, Peter N. "On the dynamics of credit risk : an econometric analysis /." Berlin : Dissertation.de, 2007. http://www.dissertation.de/buch.php3?buch=5090.

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Lomenzo, Richard A. "Dynamic measurement and characterization of Poisson's ratio /." This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06102009-063143/.

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Lomenzo, Richard A. Jr. "Dynamic measurement and characterization of Poisson's ratio." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/42988.

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<p>Poisson's ratio for aluminum is estimated from velocity proflle measurements of a free-free beam under dynamic loading conditions A weighted least-squares method is used to select a beam model which is subsequently used to determine the transverse and anticlastic radii of curvature. The model of the beam velocity profile is selected using forward regression with the possible regressor set formed by products of Legendre polynomials in x and y, the two-dimensional coordinates of the beam. The resulting model is manipulated to extract the transverse and anticlastic radii of curvature of the be

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Davison, Peter James. "An evaluation of dynamic thermal ratings for load accommodation in power distribution networks." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3997.

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This thesis presents an evaluation of the use of Dynamic Thermal Ratings (DTRs) to provide additional network headroom for load consumer connections in electrical power distribution networks. The requirement for additional headroom can come from a number of sources including, limitations in the current network configuration, the need to provide connections to new consumers at minimal cost and to provide additional capacity in the transition to the low carbon economy. DTRs are a method by which the current carrying capacity of power system components such as transformers and overhead lines can

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Zhao, Lin. "DYNAMIC REPRESENTATION OF FINANCIAL RATIOS: A DESIGN AND EMPIRICAL TEST." online version, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1201293293.

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Morlot, Thomas. "La gestion dynamique des relations hauteur-débit des stations d'hydrométrie et le calcul des incertitudes associées : un indicateur de gestion, de qualité et de suivi des points de mesure." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU029/document.

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Pour répondre à trois enjeux principaux que sont la sûreté des installations, le respect d'exigences règlementaires et l'optimisation des moyens de production, EDF-DTG a développé un réseau d'observations qui comprend les paramètres climatiques tels que la température de l'air, les précipitations et l'enneigement, mais aussi le débit des rivières. Les données collectées permettent la surveillance en « temps réel » des cours d'eau ainsi que la réalisation d'études hydrologiques quantitatives ou de dimensionnement qui nécessitent de disposer de séries patrimoniales de références. Assurer la qual

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Woods, Brian A. "Bilateral ratios from dynamic knee extension, an exploratory and methodological study." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ35543.pdf.

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Iglesias, Angel Moises. "Investigating Various Modal Analysis Extraction Techniques to Estimate Damping Ratio." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35890.

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Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. Also, as a consequence of all this work, there are some other works devoted to the evaluation and comparison of these methods in order to find which one is the most reliable method with respect to certain characteristics. In this thesis the Rational Fraction Polynomial (RFP) Method, the Prony or Complex Exponential Method (CEM), the Ibrahim Time Domain (ITD) Method, and Hilbert Envelope Method are used to evaluate how the

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Ripoll, i. Missé Jordi. "Evolution of Sex-Ratio in Structured Population Dynamics." Doctoral thesis, Universitat de Barcelona, 2005. http://hdl.handle.net/10803/2109.

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In this Thesis we address the study of some non-linear evolution equations (e.g. pde's) modelling the dynamics of sexually-reproducing structured populations, with special emphasis on biological evolution driven by natural selection. The latter is incorporated into the models through the adaptive dynamics, which is a way of describing how the hereditary characteristics of the population evolve. The sex-ratio, defined as the proportion between females and males, is analyzed from the evolutionary point of view.<br/><br/>The memoir is divided into two parts plus a brief introduction to age-struct

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Li, Gongjie. "Long-Term Dynamics of High Mass Ratio Multiples." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467288.

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This thesis presents a series of studies on the dynamics of high mass ratio multiples, with applications to planetary systems orbiting stars and stellar systems orbiting supermassive black holes (SMBHs). Almost two thousand exoplanetary systems have recently been discovered, and their configurations gave rise to new puzzles to planetary formation theories. We studied the dynamics of planetary systems aiming to understand how the configuration of planetary system is sculptured and to probe the origin of planetary systems. First, we discussed hierarchical three-body dynamics, which can be appl

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Sisman, Fatma Nurten. "Estimation Of Dynamic Soil Properties And Soil Amplification Ratios With Alternative Techniques." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615501/index.pdf.

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Earthquakes are among the most destructive natural disasters affecting urban populations. Structural damage caused by the earthquakes varies depending not only on the seismic source and propagation properties but also on the soil properties. The amplitude and frequency content of seismic shear waves reaching the earth&rsquo<br>s surface is dependent on local soil conditions. It is well known that the soft sediments on top of hard bedrock can greatly amplify the ground motion and cause severe structural damage. When the fundamental period of the soil is close to the fundamental period of a stru

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Gurkan, Niyazi Ersan. "Non-linear Mathematical Modeling Of Gear Rotor Bearing Systems Including Bearing Clearance." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606798/index.pdf.

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ABSTRACT NON-LINEAR MATHEMATICAL MODELING OF GEAR-ROTOR-BEARING SYSTEMS INCLUDING BEARING CLEARANCE G&Uuml<br>RKAN, Niyazi Ersan M.S. Department of Mechanical Engineering Supervisor: Prof. Dr. H. Nevzat &Ouml<br>ZG&Uuml<br>VEN November 2005, 130 pages In this study, a non-linear mathematical model of gear-rotor systems which consists of elastic shafts on elastic bearings with clearance and coupled by a non-linear gear mesh interface is developed. The mathematical model and the software (NLGRD 2.0) developed in a previous study is extended to include the non-linear effects due to bearing c

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Hansson, Mattis. "Rating of discharge at monitoring station affected by backwater effects - El Deim station in the Blue Nile." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-206149.

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On the Blue Nile in Sudan, near the Ethiopian border, there is a measurement station named El Deim. The discharge assessments carried out at this station are crucial for the water resource management in Sudan. Due to changed conditions, caused by a heightening of the downstream-located Roseires dam, new methods for discharge assessment are needed. The objective of the present study was to examine possibilities and methodologies to assess the discharge at this station. The flow dynamics was examined through steady state as well as dynamic hydraulic modeling by use of the Mike 11 modeling softwa

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Todd, Michael. "One dimensional dynamics : cross-ratios, negative Schwarzian and structural stability." Thesis, University of Warwick, 2003. http://wrap.warwick.ac.uk/50608/.

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This thesis concerns the behaviour of maps with a unique critical point which is either a maximum or a minimum: so-called unimodal maps. Our first main result proves that for C2+η unimodal maps with non-flat critical point we have good control on the behaviour of cross-ratios on small scales. This result, an improvement on a result of Kozlovski in [K2], proves that in many cases the negative Schwarzian condition (which is not even defined if a map is not C3) is unnecessary. This result follows recent work of Shen, van Strien and Vargas. The main tools are standard cross-ratio estimates, the us

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