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Dissertations / Theses on the topic 'Main electrical networks'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Iindombo, Julia Dimbulukweni. "Efficiency plan for large interconnected urban ring main network under contingency conditions." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/1185.

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Thesis (MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2011<br>In a situation, where there is a shortage of power generation or the power stations are operating with a very low reserve margin, as is typically the current position in South Africa, there is a need to operate distribution network at the highest possible efficiency by utilising network power loss reduction techniques. Such techniques are especially important when contingencies occur as they tend to increase loss, reduce efficiencies and cause power supplies to such networks to increase. This increase can cause the network or multiples of such networks to be load shed as the power stations do not have the reserve margins to meet this increased demand. The ideal situation would thus be to minimise network loss and in so doing decrease the amount of power needed and possibly avoid load shedding. Thus, there is a need to study efficiency, network loss reduction under contingency conditions and this is the focus of the research. Most large urban distribution networks are operated as ring main networks. Ring networks are considered to have less power loss. However, a major component in a ring network can cause the loss to substantially increase; resulting in power shortage in the network. There is an urgency to eliminate high network loss. An efficiency plan was developed for a large ring network that reduces the loss so that its input power can be decreased. In this way, the available power existing due to the contingency can be more evenly spread, and the number of ring main networks to be load shed could be reduced.

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2

Lee, Hyungkeun. "Efficient techniques for multimedia transmission over packet-switched cellular networks." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.

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3

Heo, Nojeong Varshney Pramod K. "Distributed deployment algorithms for mobile wireless sensor networks." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.

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4

Mantar, Haci Ali Chapin Stephen J. Hwang Junseok. "A scalable resource management framework for QoS-enabled multidomain networks." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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5

Ten, Chui Fen. "Loss of mains detection and amelioration on electrical distribution networks." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/loss-of-mains-detection-and-amelioration-on-electrical-distribution-networks(b7680a62-7caa-4fd3-89d4-d45e649f8ef9).html.

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Power system islanding is gaining increasing interest as a way to maintain power supply continuity. However, before this operation become viable, the technical challenges associated with its operation must first be addressed. A possible solution to one of these challenges, out-of synchronism reclosure, is by running the islanded system in synchronism with the mains whilst not being electrically connected. This concept, known as 'synchronous islanded operation' avoids the danger of out-of-synchronism reclosure of the islanded system onto the mains. The research in this thesis was based on the concepts presented in [1-3] and specifically applied to multiple-DG island scenarios. The additional control challenges associated with this scenario are identified and an appropriate control scheme, more suited for the operation of multiple-DG synchronous islands, is proposed. The results suggest that multiple-DG synchronous islanded operation is feasible, but a supervisory controller is necessary to facilitate the information exchange within the islanded system and enable stable operation.For maximum flexibility, the synchronous island must be capable of operating with a diversity of generation. The difficulties become further complicated when some or all of the generation consists of intermittent sources. The performance of the proposed control scheme in the presence of a significant contribution of renewable sources within the island is investigated. Two types of wind technologies were developed in PSCAD/EMTDC for this purpose, they are a fixed speed induction generator (FSIG) based wind farm and a doubly-fed induction generator (DFIG) based wind farm. The results show that although synchronous islanded operation is still achievable, the intermittent output has an adverse effect on the control performance, and in particular limits the magnitude of disturbances that can happen in the island without going beyond the relaxed synchronisation limits of ±60o.Energy storage is proposed as a way to reduce the wind farm power variation and improve phase controller response. A supplementary control is also proposed such that DFIG contributes to the inertial response. The potential of the proposed scheme (energy storage + supplementary control) is evaluated using case studies. The results show massive improvement to the load acceptance limits, even beyond the case where no wind farm is connected. The benefit of the proposed scheme is even more apparent as the share of wind generated energy in the island grows.

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6

Sazli, Murat Husnu Işık Can. "Neural network applications to turbo decoding." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

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7

Kang, Sanggil. "Identification of neural network input types and input ranking via sensitivity analysis." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.

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8

Rajagopalan, Ramesh. "A multi-objective optimization approach for sensor network design." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.

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9

Yao, James Chung-Yo. "Leaders for Manufacturing Program electronic mail network." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/61055.

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10

Duenas-Osorio, Leonardo Augusto. "Interdependent Response of Networked Systems to Natural Hazards and Intentional Disruptions." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7546.

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Critical infrastructure systems are essential for the continuous functionality of modern global societies. Some examples of these systems include electric energy, potable water, oil and gas, telecommunications, and the internet. Different topologies underline the structure of these networked systems. Each topology (i.e., physical layout) conditions the way in which networks transmit and distribute their flow. Also, their ability to absorb unforeseen natural or intentional disruptions depends on complex relations between network topology and optimal flow patterns. Most of the current research on large networks is focused on understanding their properties using statistical physics, or on developing advanced models to capture network dynamics. Despite these important research efforts, almost all studies concentrate on specific networks. This network-specific approach rules out a fundamental phenomenon that may jeopardize the performance predictions of current sophisticated models: network response is in general interdependent, and its performance is conditioned on the performance of additional interacting networks. Although there are recent conceptual advances in network interdependencies, current studies address the problem from a high-level point of view. For instance, they discuss the problem at the macro-level of interacting industries, or utilize economic input-output models to capture entire infrastructure interactions. This study approaches the problem of network interdependence from a more fundamental level. It focuses on network topology, flow patterns within the networks, and optimal interdependent system performance. This approach also allows for probabilistic response characterization of interdependent networked systems when subjected to disturbances of internal nature (e.g., aging, malfunctioning) or disruptions of external nature (e.g., coordinated attacks, seismic hazards). The methods proposed in this study can identify the role that each network element has in maintaining interdependent network connectivity and optimal flow. This information is used in the selection of effective pre-disaster mitigation and post-disaster recovery actions. Results of this research also provide guides for growth of interacting infrastructure networks and reveal new areas for research on interdependent dynamics. Finally, the algorithmic structure of the proposed methods suggests straightforward implementation of interdependent analysis in advanced computer software applications for multi-hazard loss estimation.

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11

Xie, Hailian. "On Power-system Benefits, Main-circuit Design, and Control of StatComs with Energy Storage." Doctoral thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10302.

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12

Laptik, Raimond. "Automobilių registracijos numerių atpažinimo tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050617_085253-23696.

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In the presented master paper: Analysis of car number plate recognition, optical character recognition (OCR), OCR software, OCR devices and systems are reviewed. Image processing operators and artificial neural networks are presented. Analysis and application of image processing operators for detection of number plate is done. Experimental results of estimation of Kohonen and multilayer feedforward artificial neural network learning parameters are presented. Number plate recognition is performed by the use of multilayer feedforward artificial neural network. Model of number plate recognition system is created. Number plate recognition software works in Microsoft© Windows™ operating system. Software is written with C++ language. Experimental results of system model operation are presented.

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13

Scarlato, Michele. "Sicurezza di rete, analisi del traffico e monitoraggio." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3223/.

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Il lavoro è stato suddiviso in tre macro-aree. Una prima riguardante un'analisi teorica di come funzionano le intrusioni, di quali software vengono utilizzati per compierle, e di come proteggersi (usando i dispositivi che in termine generico si possono riconoscere come i firewall). Una seconda macro-area che analizza un'intrusione avvenuta dall'esterno verso dei server sensibili di una rete LAN. Questa analisi viene condotta sui file catturati dalle due interfacce di rete configurate in modalità promiscua su una sonda presente nella LAN. Le interfacce sono due per potersi interfacciare a due segmenti di LAN aventi due maschere di sotto-rete differenti. L'attacco viene analizzato mediante vari software. Si può infatti definire una terza parte del lavoro, la parte dove vengono analizzati i file catturati dalle due interfacce con i software che prima si occupano di analizzare i dati di contenuto completo, come Wireshark, poi dei software che si occupano di analizzare i dati di sessione che sono stati trattati con Argus, e infine i dati di tipo statistico che sono stati trattati con Ntop. Il penultimo capitolo, quello prima delle conclusioni, invece tratta l'installazione di Nagios, e la sua configurazione per il monitoraggio attraverso plugin dello spazio di disco rimanente su una macchina agent remota, e sui servizi MySql e DNS. Ovviamente Nagios può essere configurato per monitorare ogni tipo di servizio offerto sulla rete.

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14

Chvatík, Štěpán. "Asynchronní motor s vnějším rotorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377075.

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15

Athamneh, Abedalgany. "Open main detection in underground distribution network using statistical approaches." 2009. http://hdl.handle.net/10106/1670.

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16

Кукава, Л. В. "Особливості обліку, аналізу та аудиту амортизації необоротних активів (на прикладі Відокремленого структурного підрозділу Південної електроенергетичної системи ДП НЕК «Укренерго» Одеські магістральні електричні мережі)". Thesis, 2017. http://dspace.oneu.edu.ua/jspui/handle/123456789/6425.

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Мета і завдання дослідження. Метою дослідження є обґрунтування теоретичних, методичних і практичних засад нарахування та організації обліку амортизації необоротних активів та розробка рекомендацій щодо їх вдосконалення на вітчизняних підприємствах. Досягнення поставленої мети зумовило необхідність виконання таких завдань: - дослідити економічну сутність амортизації необоротних активів; - розглянути нормативне регулювання обліку амортизації необоротних активів в Україні; - з’ясувати принципові відмінності нарахування амортизації необоротних активів в облікових підсистемах; - охарактеризувати особливості організації обліку, аналізу та аудиту амортизації необоротних активів на досліджуваному підприємстві; - запропонувати шляхи вдосконалення теоретичних та практичних аспектів обліку, аналізу та аудиту амортизації необоротних активів.<br>Цель и задачи исследования. Целью исследования является обоснование теоретических, методических и практических основ начисления и учета амортизации необоротных активов и разработка рекомендаций по их совершенствованию на отечественных предприятиях. Достижение поставленной цели обусловило необходимость выполнения следующих задач: - исследовать экономическую сущность амортизации необоротных активов; - рассмотреть нормативное регулирование учета амортизации необоротных активов в Украине; - выяснить принципиальные отличия начисления амортизации необоротных активов в учетных подсистемах; - охарактеризовать особенности организации учета, анализа и аудита амортизации необоротных активов на исследуемом предприятии; - предложить пути совершенствования теоретических и практических аспектов учета, анализа и аудита амортизации необоротных активов.<br>The purpose and objectives of the study. The aim of the study is justification of theoretical, methodological and practical basis of calculation and accounting of depreciation of capital assets and development of recommendations for improvement in domestic enterprises. Achieving this goal has necessitated the following tasks: - to investigate the economic nature of depreciation of fixed assets; - to consider the normative regulation of accounting for depreciation of fixed assets in Ukraine; - figure out the fundamental differences of depreciation of fixed assets in the accounting subsystems; describe the features of organization of accounting, analysis and audit amortization of capital assets for the investigated enterprise; - propose the ways of improvement of theoretical and practical aspects of accounting, analysis and audit of depreciation of capital assets.

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17

Marsono, Muhammad Nadzir. "Towards improving e-mail content classification for spam control: architecture, abstraction, and strategies." Thesis, 2007. http://hdl.handle.net/1828/209.

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This dissertation discusses techniques to improve the effectiveness and the efficiency of spam control. Specifically, layer-3 e-mail content classification is proposed to allow e-mail pre-classification (for fast spam detection at receiving e-mail servers) and to allow distributed processing at network nodes for fast spam detection at spam control points, e.g., at e-mail servers. Fast spam detection allows prioritizing e-mail servicing at receiving e-mail servers to safeguard non-spam e-mail deliveries even under heavy spam traffic. Fast spam detection also allows spam rejection during Simple Mail Transfer Protocol sessions for inbound and outbound spam control. We have four contributions in the dissertation. In our first contribution, we propose a hardware architecture for naive Bayes content classification unit for a high-throughput spam detection computation. We use the logarithmic number system to simplify the naive Bayes computation. To handle the fast but lossy logarithmic number system computation, we analyze the noise model of our hardware architecture. Through noise analysis, synthesis, and verification by numerical simulation, we show that the naive Bayes classification unit, implemented on FPGA is capable of processing, with very low computation noise, more than one hundred million features per second, an order of magnitude faster than that on a general-purpose processor implementation. In our second contribution, we propose e-mail content pre-classification at network layer (layer 3) instead of at application layer (layer 7) as currently being practiced to allow e-mail packet pre-classification and distributed processing for effective spam detection beyond server implementations. By performing e-mail content classification at a lower abstraction level, e-mail packets can be pre-processed, without reassembly, at any network node between sender and receiver. We demonstrated that the naive Bayes e-mail content classification can be adapted for layer-3 processing. We also show that fast e-mail class estimation can be performed at receiving e-mail servers. Through simulation using e-mail data sets, we showed that the layer-3 e-mail content classification is capable of detecting spam with accuracy and false positive values that approximately equal the ones at layer 7. In our third contribution, we propose a prioritized e-mail servicing scheme using a priority queuing approach to improve spam handling at receiving e-mail servers. In this scheme, priority is given higher to non-spam e-mails than spam. Four servicing strategies for the proposed scheme are studied. We analyzed the performance of this scheme under different e-mail traffic loads and service capacities. We show that the non-spam delay and loss probability can be reduced when the server is under-provisioned. In our fourth contribution, we propose a spam handling scheme that rejects spam during Simple Mail Transfer Protocol sessions. The proposed spam handling scheme allows inbound and outbound spam control. It is capable of reducing servers' loadings and hence, non-spam queuing delay and loss probability. We analyze the performance of this scheme under different e-mail traffic loads and service capacities. We show that the non-spam delay and loss probability can be reduced when the server is under-provisioned. In this dissertation, we present four techniques to improve spam control based on e-mail content classification. We envision that our proposed approaches complement rather than replace the current spam control systems. The proposed four approaches are capable to work with existing spam control systems and support proactive spam and other e-mail-based threats such as phishing and e-mail worm controls anywhere across the Internet.

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18

Santos, Ângelo Emanuel Neves dos. "Design and simulation of a smart bottle with fill-level sensing based on oxide TFT technology." Master's thesis, 2016. http://hdl.handle.net/10362/19593.

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Packaging is an important element responsible for brand growth and one of the main rea-sons for producers to gain competitive advantages through technological innovation. In this re-gard, the aim of this work is to design a fully autonomous electronic system for a smart bottle packaging, being integrated in a European project named ROLL-OUT. The desired application for the smart bottle is to act as a fill-level sensor system in order to determine the liquid content level that exists inside an opaque bottle, so the consumer can exactly know the remaining quantity of the product inside. An in-house amorphous indium–gallium–zinc oxide thin-film transistor (a-IGZO TFT) model, previously developed, was used for circuit designing purposes. This model was based in an artificial neural network (ANN) equivalent circuit approach. Taking into account that only n-type oxide TFTs were used, plenty of electronic building-blocks have been designed: clock generator, non-overlapping phase generator, a capacitance-to-voltage converter and a comparator. As it was demonstrated by electrical simulations, it has been achieved good functionality for each block, having a final system with a power dissipation of 2.3 mW (VDD=10 V) not considering the clock generator. Four printed circuit boards (PCBs) have been also designed in order to help in the testing phase. Mask layouts were already designed and are currently in fabrication, foreseeing a suc-cessful circuit fabrication, and a major step towards the design and integration of complex trans-ducer systems using oxide TFTs technology.

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