Rozprawy doktorskie: „Central Electric Power Cooperative”

1

Castillo, Martínez José Federico. "How to make electric power markets work : the case of Central America". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42689.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
Includes bibliographical references (leaves 85-88).
by José Federico Castillo Martínez.
M.S.

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2

Jayachandran, Krishna K. "STBC-encoded cooperative asynchronous transmissions for transmission energy efficiency". Diss., Online access via UMI:, 2005.

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3

Janigian, Darren. "Plug-In Hybrid Electric Vehicle Impacts on a Central California Residential Distribution Circuit". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/513.

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The adoption of plug-in hybrid electric vehicles (PHEV) as a means of transportation over conventionally fueled vehicles introduces new challenges to the existing infrastructure of the electrical transmission and distribution system. PHEV battery charging can represent a significant power demand that has the potential to overload electrical distribution components. This study examines the impacts of PHEV charging on household service transformers, distribution conductors and voltage levels of a Central California residential distribution system. The system is simulated using ETAP power system analysis software. Transformers are the most vulnerable to overloads, especially if PHEV charging occurs in clusters. Main feeder conductors will be overloaded if a large amount of high power, quick charging occurs. Branch conductors will not be affected by PHEV charging. Based on current PHEV market projections for the region this study shows that significant equipment overloads are not likely to occur until well after 2017.

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4

Dalen, Ingar. "Economic Benefit of New Capacity in the Central Grid". Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9860.

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Norway and the EU have in recent years established ambitious goals to increase the share of renewable energy in their consumption. On account of these goals, a large-scale wind power development can be expected in northern Norway and Sweden. This development may be financed both by Norway and by countries with less wind resources in order to meet the energy goals imposed upon them. An increased power surplus is dependent on TSOs' abilities to transmit increased amounts of power through the Nordic grid. A scenario of likely power market conditions in year 2025 is used as a basis. The scenario has a high expectancy of new wind power as well as strong grid investments compared to the level in 2009. This thesis assumes an additional increase in annual renewable power production of 22 TWh, divided into 16 TWh in northern Norway and 6 TWh in northern Sweden. Results show that this amount of new power cannot be implemented without large grid investments. The Energy and Power Flow model is utlized to simulate the Nordic power flow for different levels of grid investments. Two grid solutions are proposed that allow the production increase while maintaining an acceptable state of system operation. The first uses DC transmission from Rana to Oslo in order to control power flow through Norway. An additional AC line from Kobbelv to Ritsem allows import from Sweden to the DC line. The second grid solution uses AC line upgrades throughout Norway ensuring two 420 kV lines from Ofoten to Kristiansand. Due to lower impedances in the Swedish grid, a large amount of the Norwegian production flows into and through Sweden. This solution requires a new line from Kobbelv to Ritsem and Rätan to Borgvik in order to solve resulting Swedish transmission congestion. Both grid solutions require a new DC cable from southern Norway to Germany in order to export most of the new power production. These cables require a number of supporting line upgrades in the region. Power producers schedule according to the new market situation, allowing a very high export during daytime and a low export during night. The increased power production in northern Norway and Sweden replaces other production. A high amount of gas and coal power is replaced in continental Europe. No hydropower, wind power or nuclear power is replaced. The DC and AC grid solutions allow European reductions corresponding to 19,3 % and 16,6 %, respectively, of the expected Norwegian CO2 emissions in year 2025. The cost of each grid solution is calculated to 22 760 MNOK and 19 310 MNOK. Annual system increases in valued socio-economic benefit outweigh the grid investment costs of each option by 3 300 MNOK and 3 370 MNOK per year of the period of analysis. The total cost of new power production must not exceed these values for such a decision to be socio-economically beneficial. Due to the high increases in calculated socio-economic benefit, a recommendation for further analysis is made.

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5

Kleynhans, Rodney. "The influence of atmospheric conditions on the detection of hotspots inside a substation yard". Thesis, [Bloemfontein?] : Central University of Technology, Free State, 2012. http://hdl.handle.net/11462/154.

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Thesis (M. Tech. Electrical engineering) -- Central University of technology, Free State, 2012
Infrared thermography is a non-contact method of identifying the thermal behaviour of various plant equipment and machines, including their components, qualitatively via pattern recognition and quantitatively via statistical analysis. This allows for the development of condition monitoring and predictive failure analysis. It is well established that optimized maintenance planning can be more effective when a problem is detected in the early stages of failure. For example, in electrical systems an elevated electrical resistance caused by loose or corroded connections, broken conductor strands and dirty contact surfaces, results in localized heating, and a unique infrared pattern when analysed leads to the location of the problem and an indication of its severity. In recent years industrial thermography has used infrared detectors in the long wave portion of the electromagnetic spectrum normally between 8μm and 15μm, due partly to the fact that these wavelengths are not susceptible to solar radiation and/or solar glint. A number of scientific experiments were carried out on test apparatus to improve the understanding of the impact of convection, ambient air temperature and relative humidity on resultant infrared thermal images. Two similar heat sources, simulating a hotspot, at different temperature settings were used to determine whether the hotspot temperature should also be considered in conjunction with the atmospheric elements. The need for these experiments has also been identified by EPRI (Electrical Power Research Institute) in the USA as necessary to develop international severity criteria, and it is hoped that this study will contribute to this goal.

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6

Yilmaz, Oguz. "Participation Of Combined Cycle Power Plants To Power System Frequency Control: Modeling And Application". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607228/index.pdf.

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This thesis proposes a method and develops a model for the participation of a combined cycle power plant to power system frequency control. Through the period of integration to the UCTE system, (Union for Coordination of Transmission of Electricity in Europe) frequency behavior of Turkey&rsquo
s grid and studies related to its improvement had been a great concern, so is the reason that main subject of my thesis became as &ldquo
Power System Frequency Control&rdquo
. Apart from system-wide global control action (secondary control)
load control loops at power plants, reserve power and its provision even at the minimum capacity generation stage, (primary control) are the fundamental concerns of this subject. The adjustment of proper amount of reserve at the power plants, and correct system response to any kind of disturbance, in the overall, are measured by the quality of the frequency behaviour of the system. A simulator that will simulate a dynamic gas turbine and its control system model, together with a combined cycle power plant load controller is the outcome of this thesis.

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7

Lee, Kyoung Hoon. "Industrial evolution and national institutional advantage : a comparative analysis of the photovoltaic industry in Germany, China and South Korea". Thesis, University of Sussex, 2012. http://sro.sussex.ac.uk/id/eprint/42076/.

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A number of alternative economic and economic geography theories have been developed to account for the divergence of national political economy and industrial dynamics. These include the varieties of capitalism, developmental state, neo-Schumpeterian innovation, and Gerschenkronian catching-up theories. In this thesis I shall argue that in these theories a core and often shared concept of "institutional advantage" plays a central role in explaining different economic performances across nations. This concept is elaborated as a means of examining the causal relationships between institutional advantages and four necessary functions (market creation, capital mobilisation, process innovation and cost reduction) in the development of the photovoltaic (PV) industry of Germany, China, and South Korea. The development of these industries is examined in detail on the basis of empirical evidence in the form of archival and interview based data. Two main conclusions are reached. Firstly, domestic market creation is not a generally necessary condition for the development of a local PV industry at a national level. China's PV industry grew fast without a sufficient domestic market unlike in Germany. However, domestic market creation is important, because the domestic PV industry, national support policy and the domestic market are interrelated. Secondly, capital mobilisation is a core function in establishing the PV industry. In the 2000s, Korea failed to establish its local PV industry despite an institutional advantage in creating domestic markets, mainly due to the fact that it had an institutional disadvantage in mobilising capital. However, Germany and China succeeded in mobilising capital in their PV sectors, governments playing a decisive role in facilitating the raising of funds in both cases. This research contributes to a better understanding of the nature of industrial dynamics in the context of institutional configurations of a national political economy, broadening the usage of "institutional advantage" by applying this concept to comparative analysis on the national PV trajectories. Moreover, from the perspective of the social system, four necessary functions for the PV industry have been proposed and investigated.

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8

Fang, Yuanxing. "Development of low dimensional nanostructured materials for green energy harvesting". Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/66110/.

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The decreasing availability of fossil fuels and their negative environmental impacts requires urgent need of developing renewable energy. The main objective of this research was to develop low-dimensional nanomaterials for harvesting solar and mechanical energy with high conversion efficiency. In particular, photoelectrochemical water splitting and photovoltaic cell applications driven by sunlight were investigated in this project. A highly efficient triboelectric nanogenerator was investigated for harvesting mechanical energy. The device was further integrated with an organic solar cell for harvesting both mechanical energy and solar energy. My research work started with the synthesis of nanostructured materials. Electrospinning, as well as electrospray, was developed to synthesise nanofibres and hollow hemispheres. The influences of processing parameters to the morphologies and structures of the nanomaterials were systematically investigated. An electrophoretic deposition method was also developed to form good-quality nanostructured metal oxide thin films, which were applied in photoelectrochemical water splitting. The metal oxide hollow hemisphere thin films were also applied in dye-sensitised solar cells. A transparent and flexible triboelectric nanogenerator was developed in order to harvest mechanical energy. The contact electrodes were created using metal nanowire percolation networks embedded in a polymer matrix. The correlation between the energy conversion performances and optical property of the triboelectric electrodes were comprehensively studied as a function of the areal fraction of the metal nanowires. A flexible hybrid cell, integrating the solar cell with the triboelectric device, was designed by constructing an organic solar cell under a single-electrode triboelectric nanogenerator. The hybrid cell could convert both solar and mechanical energies into electricity independently and simultaneously. Such devices are potentially able to supply electricity day and night. Nanomaterials offer novel approaches for enhancing the efficiency of harvesting solar and mechanical energy in a hybrid device.

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9

Marques, Frederico Augusto Spolidorio. "Implementação e validação pratica de modelos multidisciolinares abordados em uma central de co-geração de energia eletrica". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259510.

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Orientador: Luiz Carlos Pereira da Silva
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-10T03:25:09Z (GMT). No. of bitstreams: 1 Marques_FredericoAugustoSpolidorio_M.pdf: 3699527 bytes, checksum: fee04cbb6876f5ce62626058ebc660e7 (MD5) Previous issue date: 2007
Resumo: Este projeto busca relacionar diversos aspectos interdisciplinares envolvidos em uma central de co-geração de energia elétrica. Motivado pela crescente inserção de centrais de geração distribuída operando de forma ilhada ou paralela ao sistema, foram desenvolvidos modelos mecânicos (térmicos e dinâmicos) e elétricos buscando representar os diversos equipamentos envolvidos em uma central de geração em um nível industrial. Baseado nesta concepção, optou-se pela geração de energia através de máquinas térmicas (turbinas a vapor) impulsionadas pela energia proveniente da queima de biomassa restante de diferentes processos industriais. Os modelos teóricos aqui representados foram numericamente simulados com parâmetros obtidos em um estudo de caso real. Seus resultados foram então comparados qualitativamente e quantitativamente contra as variáveis reais do processo analisado. Ao consolidar esta ferramenta de estudo, o simulador mostrou-se eficiente no treinamento de operadores de casas de forças, sendo capaz de esclarecer as interferências entre o nível de carga com as demais variáveis envolvidas em seu processo
Abstract: This project intends to gather several interdisciplinary aspects common to a co-generation power plant. Driven by the increasing amount of distributed generation units operating on island or parallel mode with the network, some mechanical (thermo and dynamic) and electrical models were developed in order to represent the equipments usually installed on an industrial size power station. Based on this concept, the more convenient option was to proceed the evaluation through turbo machinery (steam turbine) driven by the energy acquired from the heat power on burning byproducts of industrial processes. The theoretical models were simulated with parameters obtained from a real case study. The results were then finally compared with real process information acquired from field research. In order to consolidate this computational tool, the simulator has shown efficient results on training power station operators on clarifying the impacts of load level on the other relevant variables on their processes
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica

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10

Johnson, Oliver W. "The evolution of donor-recipient relations in electricity reform : rethinking the principal-agent framework". Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6974/.

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Since the early 1990s electricity reforms across Sub-Saharan Africa have been marked by controversy. Despite the World Bank's major role in driving electricity reform as part of its conditional lending strategy in the electricity sector, its relationship with recipient countries has received little attention within the electricity reform literature. This is surprising given the increasing pressure on the World Bank to improve the effectiveness of its conditional lending more generally. This thesis contributes to filling this gap by exploring how World Bank-recipient country relations shape and constrain the direction of reform. The donor-recipient relationship is commonly espoused in the academic literature as a principal-agent relationship, whereby international aid organisations (principals) delegate authority for implementing their development policies to recipient countries (agents). I develop this framework by incorporating refined concepts of power, partnership, ownership and knowledge, prominent features in development studies literature and recent donor discourse. The analytical framework developed is applied to the process of electricity reform in two countries: Tanzania and Ghana. While the impetus for reform in these two countries was similar, the way in which the reform process unfolded was different. The analysis is based on in-depth, semi-structured interviews and documentary evidence. It uses a process-tracing method, combining within-case and cross-case analysis. A number of insights emerge from the analysis. I find that availability of reform expertise plays a significant role in determining the strength of power relations between donors and recipient countries. It also appears that reform ownership lies within different ‘domains'. Uneven ownership across domains accounts for the inconsistent reform implementation noted in both cases. And knowledge asymmetry provides a useful concept to analyse the impact of decentralised donor staff. In conclusion, this thesis argues that a modified principal-agent framework offers additional insight into the workings of the donor-recipient relationship.

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11

Mutluer, Bilge Halas. "Design, Implementation And Engineering Aspects Of Tcr For Industrial Svc Systems". Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609424/index.pdf.

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Design and implementation of TCR (Thyristor Controlled Reactor) for industrial SVC (Static VAr Compensator) systems require special design. Both power stage and control system design and implementation are thoroughly investigated in this thesis. Engineering aspects of TCR design are emphasized and supported with case studies. As the first case study
a novel, unified and relocatable SVC for open cast lignite mining in Turkey is designed, implemented and commissioned. The second case study is the first 12 pulse TCR design and implementation for ladle furnace compensation in the world. The SVC simulation results are verified by data acquired in the field. Real time data are also simulated in EMTDC/PSCAD program to verify the control system responses of the commissioned systems.

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12

Simsek, Gunay. "Sensorless Direct Field Oriented Control Of Induction Machine By Flux And Speed Estimation Using Model Reference Adaptive System". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604965/index.pdf.

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ABSTRACT SENSORLESS DIRECT FIELD ORIENTED CONTROL OF INDUCTION MACHINE BY FLUX AND SPEED ESTIMATORS USING MODEL REFERENCE ADAPTIVE SYSTEM This work focuses on an observer design which will estimate flux-linkage and speed for induction motors in its entire speed control range. The theoretical base of the algorithm is explained in detail and its both open-loop, and closed-loop performance is tested with experiments, measuring only stator current and voltage. Theoretically, the field-oriented control for the induction motor drive can be mainly categorized into two types
indirect and direct field oriented. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control, the slip estimation based on the measured or estimated rotor speed is required in order to compute the synchronous speed. There is no need for the flux estimation in such a system. For the direct field oriented case the synchronous speed is computed with the aid of a flux estimator. In DFO, the synchronous speed is iv computed from the ratio of dq-axes fluxes. With the combination of a flux estimator and an open-loop speed estimator one can observe stator-rotor fluxes, rotor-flux angle and rotor speed. In this study, the direct (rotor) flux oriented control system with flux and-open-loop speed estimators is described and tested in real-time with the Evaluation Module named TMS320LF21407 and the Embedded Target software named Vissim from Visual Solutions Company.

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13

Sharp, Tammy-Ann. "Exploring the potential impact of carbon, capture and storage technologies on the diversity of the UK electricity system to 2050". Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/51575/.

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Creating a diverse and flexible energy system to ensure security of supply is at the heart of UK energy policy. However, despite the apparent interest in the idea of securing supply in this way and the term ‘diversity' becoming more frequently used in this context in government White Papers, policy discourse and the academic literature relatively little attention has been given to exploring what diversity means, how it can be measured, what contribution it can make to different policy objectives and the specific implications for the UK electricity system. Furthermore CCS technologies which are becoming increasingly important to decarbonisation of the power sector in order to meet legally binding greenhouse gas targets set out in the Climate Change Act which raises the question, what are the potential impacts of these technologies on the diversity of the future UK electricity system? To answer this question a mixed methodology of quantitative energy-economic modelling (using MARKAL), scenario analysis and diversity analysis is combined with qualitative semi-structured stakeholder interviews. Data analysis is carried out in two parts. The first assesses the diversity (with a specific focus on the effect of different input assumptions on CCS technologies) of the scenarios generated using Stirling's Diversity Heuristic and creates a set of ‘diversity profiles' which map changes in diversity across each scenario. The second part uses stakeholder perspectives to inform the quantification of diversity across the same set of scenarios providing evidence of the impact of different stakeholder perspectives on the overall diversity of the electricity system.

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14

Nigrini, Lucas Bernardo. "Developing a neural network model to predict the electrical load demand in the Mangaung municipal area". Thesis, [Bloemfontein?] : Central University of Technology, Free State, 2012. http://hdl.handle.net/11462/176.

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Thesis (D. Tech. (Engineering: Electric)) -- Central University of technology, 2012
Because power generation relies heavily on electricity demand, consumers are required to wisely manage their loads to consolidate the power utility‟s optimal power generation efforts. Consequently, accurate and reliable electric load forecasting systems are required. Prior to the present situation, there were various forecasting models developed primarily for electric load forecasting. Modelling short term load forecasting using artificial neural networks has recently been proposed by researchers. This project developed a model for short term load forecasting using a neural network. The concept was tested by evaluating the forecasting potential of the basic feedforward and the cascade forward neural network models. The test results showed that the cascade forward model is more efficient for this forecasting investigation. The final model is intended to be a basis for a real forecasting application. The neural model was tested using actual load data of the Bloemfontein reticulation network to predict its load for half an hour in advance. The cascade forward network demonstrates a mean absolute percentage error of less than 5% when tested using four years of utility data. In addition to reporting the summary statistics of the mean absolute percentage error, an alternate method using correlation coefficients for presenting load forecasting performance results are shown. This research proposes that a 6:1:1 cascade forward neural network can be trained with data from a month of a year and forecast the load for the same month of the following year. This research presents a new time series modeling for short term load forecasting, which can model the forecast of the half-hourly loads of weekdays, as well as of weekends and public holidays. Obtained results from extensive testing on the Bloemfontein power system network confirm the validity of the developed forecasting approach. This model can be implemented for on-line testing application to adopt a final view of its usefulness.

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15

Koc, Erkan. "Modeling And Investigation Of Fault Ride Through Capability Of Variable Speed Wind Turbines". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612534/index.pdf.

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Technological improvements on wind energy systems with governmental supports have increased the penetration level of wind power into the grid in recent years. The high level of penetration forces the wind turbines stay connected to the grid during the disturbances in order to enhance system stability. Moreover, power system operators must revise their grid codes in parallel with these developments. This work is devoted to the modeling of variable speed wind turbines and the investigation of fault ride trough capability of the wind turbines for grid integration studies. In the thesis, detailed models of different variable speed wind turbines will be presented. Requirements of grid codes for wind power integration will also be discussed regarding active power control, reactive power control and fault ride through (FRT) capability. Investigation of the wind turbine FRT capability is the main focus of this thesis. Methods to overcome this problem for different types of wind turbines will be also explained in detail. Models of grid-connected wind turbines with doubly-fed induction generator and permanent magnet synchronous generator are implemented in the dedicated power system analysis tool PSCAD/EMTDC. With these models and computer simulations, FRT capabilities ofvariable speed wind turbines have been studied and benchmarked and the influences on the grid during the faults are discussed.

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16

Caliskan, Ahmet. "Constant Voltage, Constant Frequency Operation Of A Self-excited Induction Generator". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606678/index.pdf.

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In this thesis, control schemes for the self-excited induction generator are developed with Matlab/Simulink. Self-excited induction generator is considered as a constant voltage-constant frequency supply for an isolated load. A wind turbine is assumed to be the variable-speed drive of the induction generator. Control schemes aim to ensure a constant voltage-constant frequency operation of the induction generator in case of the variations in the wind speed and/or the load. From the general model of the self-excited induction generator, the characteristics of the system and the dynamic responses of the system in case of any disturbance are examined. Next, the control strategies are developed both for the squirrel-cage rotor induction generator and for the wound-rotor induction generator. Two control loops are necessary for constant voltage-constant frequency operation of a variable speed induction generator, one for the voltage regulation and the other for the frequency regulation. After developing the control loops, constant voltage-constant frequency operation of the self-excited induction generator is simulated with a cage type saturation adaptive induction generator, a fixed capacitor with thyristor controlled reactor (TCR) used for frequency regulation and switched external resistors connected to the stator terminals used for voltage regulation.

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17

Cerro, Jordi del. "La Generación de energía eléctrica en la época franquista, 1940-1975". Doctoral thesis, Universitat Pompeu Fabra, 2012. http://hdl.handle.net/10803/89368.

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La tesis estudia la evolución del parque de generación de energía eléctrica durante el franquismo (1940-1975). En este período comenzó la formación de un sistema unificado de explotación, y durante su desarrollo se pasó de 1.731Mw a 25.467Mw. El sistema que se denominó “autorregulación”, permitió la coexistencia de las empresas eléctricas privadas, agrupadas alrededor de UNESA y el INI en su vertiente eléctrica. Sin embargo, las decisiones y la política eléctrica, y más tarde energética, estuvo directamente influida por el gobierno. Se analiza la importancia de las fuentes (hidráulica, carbón, fuel oil, gas natura, nuclear) de energía primaria en la generación de energía eléctrica. Asimismo, se estudia, aunque no de manera exhaustiva el impacto del medio ambiente y sus consecuencias y efectos a largo plazo. Todo ello se desarrolla en el contexto histórico pertinente bajo una vertiente técnico-económica.
The thesis studies the evolution of the power generation system of electricity, during the Franco’s Regime (1940-1975). In this period, it began the construction of a unified system of exploitation, where the power installed was moved from 1.731Mw to 25.467Mw. The system was called "self regulation", allowing the coexistence of private electric companies, grouped around UNESA and the INI in its electrical aspect. However, the decisions and the power policy, and later on the energy, was directly influenced by the government. It discusses the importance of the primary energy sources (hydro, coal, fuel oil, natural gas, nuclear) in electric power generation. However, it is not intended to illustrate a comprenhensive explanation of the environmental impact and its consequences and effects long term. To sum up, all this takes place in the relevant historical context in a technical and economical perspective.

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18

Ketencioglu, Sinan. "Functions And Viability Of Turkish Wholesale Electricity Trading And Contracting Company (tetas) In The Short, Mid And The Long Term". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608770/index.pdf.

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This thesis analyses the necessity for the establishment, main functions and the viability of the Turkish Wholesale Electricity Trading and Contracting Company, TETAS in the short, mean and the long term. In order to understand the necessity for the establishment of TETAS, Turkish Energy Policies such as the state-led energy policies and the competition based market orientation are put under scrutiny. The thesis also discusses whether Turkish Government has carried out a comprehensive, deterministic and effective &ldquo
Liberalization Policy&rdquo
in the electricity sector by looking at the present situation and the principles outlined in Laws No: 4628, 5654 and 5686 and the Strategy Paper. The dissertation then examines the life span of TETAS by looking at the impacts of the strategy paper, liberalization procedure of the overall electricity market and newly enacted laws such as Law No: 5654 and 5686 in the short, mean and the long term. In addition, TETAS is examined whether it is a &ldquo
monopoly&rdquo
or not in Turkish Electricity wholesale market by calculating the supply concentration of TETAS using the Herfindahl Hirschman Index. Despite the studies on the establishment of the liberal market such as the envisagement of Law No: 4628 and the strategy paper, this thesis study envisages that it is still not possible to talk about a liberal electricity market. In addition, it is also concluded that the statements outlined in Laws No: 5654 and 5686 hinder the overall liberalization efforts since these laws are postponing the liberalization of electricity sector and making the life span of TETAS longer. As a result, liberalization efforts on the electricity market are unsuccessful in the mean term and TETAS seems to hold its dominance position in the wholesale market as a state-owned wholesale trading company in the long run.

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19

Gollwitzer, Lorenz. "All together now : institutional innovation for pro-poor electricity access in sub-Saharan Africa". Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/67333/.

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Access to electricity is an important precondition to many aspects of human and economic development. Yet, in rural sub-Saharan Africa in particular, access rates remain very low — at an average of 17% and much lower in some cases. Rural electrification in Kenya, the focus of this thesis, had only reached 7% in 2014. Given the goal of universal electrification by 2030, formulated as part of Sustainable Development Goal 7, scalable and replicable approaches that are able to support productive and non-productive uses are required. Mini-grids are one promising solution to this problem, alongside grid extension and off-grid approaches such as solar home systems. However, their long-term operational sustainability has historically been a challenge. While the academic literature to date on sustainable energy access has largely been two-dimensional in its analysis of mini-grids (focusing on technology and economics or financing), this thesis contributes to an emerging body of recent contributions to the literature, which have begun to foreground socio-cultural considerations. Bridging the literature on collective action for common-pool resource (CPR) management and property rights theory, a refined theoretical framework is produced for the purpose of analysing the institutional conditions for sustainable management of rural mini-grids. The utility of this framework and of treating electricity in a mini-grid as a CPR is demonstrated via empirical analysis of three case studies of mini-grids in rural Kenya and evidence from 24 expert interviews. This yields insights on nontechnological approaches to addressing operational challenges relating to sustainable mini-grid management, e.g. fair allocation of limited amounts of electricity to different consumers in ways that are acceptable to the entire community. This thesis develops contributions to the literature on sustainable CPR management and collective action, property rights theory and energy access in developing countries. From these theoretical and empirical insights, it explores a novel institutional structure for sustainable management of pro-poor mini-grids in the form of a community–private property hybrid management platform, thereby opening up opportunities for future research into the implementation of such a platform. The thesis represents the first comprehensive attempt to analyse the institutional aspects of pro-poor mini-grid management as well as the first comprehensive attempt to treat electricity in a mini-grid as a CPR.

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20

Bidart, Damien. "Commande Coopérative des Systèmes Monoconvertisseurs Multimachines Synchrones". Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2011. http://tel.archives-ouvertes.fr/tel-00662181.

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Afin de rendre les machines synchrones à aimants permanents plus attractives pour l'aéronautique (actionneurs de commande de vol, systèmes de freinage, train d'atterrissage ...), il peut être intéressant de réduire le nombre de modules d'électronique de puissance utilisés en les mutualisant. De nombreuses études ont été réalisées pour des systèmes composés de plusieurs machines asynchrones et principalement en traction ferroviaire, mais peu concernent les machines synchrones. Après avoir étudié différentes structures envisageables, les travaux développés lors de cette thèse présentent une étude originale d'un système composé de deux machines synchrones à aimants permanents connectées en parallèle sur un onduleur unique mutualisé. Ces machines ont des caractéristiques identiques ou proches et doivent être pilotées à la même vitesse. La structure de commande retenue lors de cette thèse est de type maître-esclave: seule une des deux machines est autopilotée (la machine maître), l'autre (la machine esclave) fonctionnant en boucle ouverte. Afin d'assurer la stabilité d'un tel système, le synchronisme des deux moteurs doit toujours être respecté. Une stratégie de commande, qui choisit quel est le moteur maître, en prenant en compte la variation des paramètres internes et externes du système, est alors instaurée. Dans ces conditions, les évolutions théoriques des différentes variables sont déterminées. Pour valider ces résultats, un processus expérimental est mis en place. Les nombreux résultats obtenus en simulation et expérimentalement permettent alors de confirmer les résultats théoriques: que ce soient les paramètres mécaniques ou électriques qui varient, la stabilité du système est toujours garantie. Le cas supplémentaire où les deux machines déplacent une charge mécanique commune avec une liaison mécanique rigide entre les deux machines, est finalement développé. Une autre stratégie de commande, dont la structure et les résultats sont également présentés dans cette thèse, est alors nécessaire.

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De-CyuanWang i 王得權. "Chain Stay Torque Sensor Control System of Central Motor Electric Power Assisted Bike". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/wm57hk.

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Jing-ChengWang i 王景承. "An Innovative Design of Central Motor Electric Power Assisted Bike System with Build-in Torque Sensor". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/tr8av6.

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Feng, Xianyong. "A Bio-Inspired Multi-Agent System Framework for Real-Time Load Management in All-Electric Ship Power Systems". Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11031.

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All-electric ship power systems have limited generation capacity and finite rotating inertia compared with large power systems. Moreover, all-electric ship power systems include large portions of nonlinear loads and dynamic loads relative to the total power capacity, which may significantly reduce the stability margin. Pulse loads and other high-energy weapon loads in the system draw a large amount of power intermittently, which may cause significant frequency and voltage oscillations in the system. Thus, an effective real-time load management technique is needed to dynamically balance the load and generation to operate the system normally. Multi-agent systems, inspired by biological phenomena, aim to cooperatively achieve system objectives that are difficult to reach by a single agent or centralized controller. Since power systems include various electrical components with different dynamical systems, conventional homogeneous multi-agent system cooperative controllers have difficulties solving the real-time load management problem with heterogeneous agents. In this dissertation, a novel heterogeneous multi-agent system cooperative control methodology is presented based on artificial potential functions and reduced-order agent models to cooperatively achieve real-time load management for all-electric ship power systems. The technique integrates high-order system dynamics and various kinds of operational constraints into the multi-agent system, which improves the accuracy of the cooperative controller. The multi-agent system includes a MVAC multiagent system and a DC zone multi-agent, which are coordinated by an AC-DC communication agent. The developed multi-agent system framework and the notional all-electric ship power system model were simulated in PSCAD software. Case studies and performance analysis of the MVAC multi-agent system and the DC zone multi-agent system were performed. The simulation results indicated that propulsion loads and pulse loads can be successfully coordinated to reduce the impact of pulse loads on the power quality of all-electric ship power systems. Further, the switch status or power set-point of loads in DC zones can be optimally determined to dynamically balance the generation and load while satisfying the operational constraints of the system and considering load priorities. The method has great potential to be extended to other isolated power systems, such as microgrids.

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Casey, Robert T. Jr. "How are Electric Utilities Responding to the Impact of Renewables? Exploring an Integrative Approach to Ambidextrous Business Behavior". 2015. http://scholarworks.gsu.edu/bus_admin_diss/52.

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In the U.S., clean energy goals and the move towards a clean energy economy are causing the electric power sector to add emerging and innovative renewable energy resources into their generation mix. Electric utilities (EU) face a monumental challenge to create, deliver, and capture value from emerging and disruptive technologies. This study seeks to address the impact of solar photovoltaics on the EU market by investigating the role of business model changes within the domain of urban and rural U.S. electric utility organizations. By integrating the evolving EU business model with the Competing Values Framework (CVF), a new lens is created to assess the changing and evolving business behavior within the EU industry. Furthermore, a predictive and prescriptive tool emerges associated with organizational ambidexterity (OA). Finally, four lessons are presented that will help EU leaders become more anticipatory, adaptable, and responsive in this changing renewable environment.

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Alani, Adeshina Yahaha. "Short-term multiple forecasting of electric energy loads with weather profiles for sustainable demand planning in smart grids for smart homes". Diss., 2018. http://hdl.handle.net/10500/25216.

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Energy consumption in the form of fuel or electricity is ubiquitous globally. Among energy types, electricity is crucial to human life in terms of cooking, warming and cooling of shelters, powering of electronic devices as well as commercial and industrial operations. Therefore, effective prediction of future electricity consumption cannot be underestimated. Notably, repeated imbalance is noticed between the demand and supply of electricity, and this is affected by different weather profiles such as temperature, wind speed, dew point, humidity and pressure of the electricity consumption locations. Effective planning is therefore needed to aid electricity distribution among consumers. Such effective planning is activated by the need to predict future electricity consumption within a short period and the effect of weather variables on the predictions. Although state-of-the-art techniques have been used for such predictions, they still require improvement for the purpose of reducing significant predictive errors when used for short-term load forecasting. This research develops and deploys a near-zero cooperative probabilistic scenario analysis and decision tree (PSA-DT) model to address the lacuna of significant predictive error faced by the state-of-the-art models and to analyse the effect of each weather profile on the cooperative model. The PSA-DT is a machine learning model based on a probabilistic technique in view of the uncertain nature of electricity consumption, complemented by a DT to reinforce the collaboration of the two techniques. Based on detailed experimental analytics on residential, commercial and industrial data loads, the PSA-DT model with weather profiles outperforms the state-of-the-art models in terms of accuracy to a minimal error rate. This implies that its deployment for electricity demand planning will be of great benefit to various smart-grid operators and homes.
School of Computing
M. Sc. (Computer Science)

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