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Artykuły w czasopismach na temat "Hydrothermal power system"
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Giles, James E. "Representing Hydropower in Hydrothermal Power System". Journal of Water Resources Planning and Management 114, nr 5 (wrzesień 1988): 500–516. http://dx.doi.org/10.1061/(asce)0733-9496(1988)114:5(500).
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Pattanayak, D. N., R. N. Chakrabarti i M. Basu. "Economic Environmental Scheduling of Hydrothermal Power System". Journal of The Institution of Engineers (India): Series B 95, nr 4 (9.07.2014): 329–36. http://dx.doi.org/10.1007/s40031-014-0121-0.
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Basu, M. "Economic environmental dispatch of hydrothermal power system". International Journal of Electrical Power & Energy Systems 32, nr 6 (lipiec 2010): 711–20. http://dx.doi.org/10.1016/j.ijepes.2010.01.005.
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Basu, M. "Artificial immune system for fixed head hydrothermal power system". Energy 36, nr 1 (styczeń 2011): 606–12. http://dx.doi.org/10.1016/j.energy.2010.09.057.
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Goshovskyi, S., i O. Zurian. "ENVIRONMENTALLY SAFE USAGE OF HYDROPOWER POTENTIAL BY HYDROTHERMAL POWER SUPPLY SYSTEMS". Visnyk of Taras Shevchenko National University of Kyiv. Geology, nr 4 (87) (2019): 67–75. http://dx.doi.org/10.17721/1728-2713.87.10.
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The article contains the results of scientific research and design work related to environmentally safe usage of hydropower potential of the small rivers of the Dnieper basin. The innovative design solutions for extraction of low-grade heat energy of water and systems for its transformation into energy convenient for consumption were offered. It was established that use of renewable low-grade energy of soil is widely used in environmentally safe and economically sound power systems. At the same time hydropower potential is not widely used in hydrothermal heat pump systems. It was proved that existing hydrothermal systems are not always adjusted to actual operating conditions and object location. The evidence was provided that the scientific approach to development of appropriate configuration of hydrothermal collector, to methodology of their optimal mounting and to efficiency determination depending on operating conditions is quite topical issue. The scientific novelty of the new process approach is use of special design of water collector that has modular configuration and consists of several functionally related water sondes. The efficiency of hydrothermal system was scientifically proved. The paper describes the results of experimental research of efficiency of hydrothermal heat pump system where the low-grade heat energy of water is used as a renewable primary heating energy source for functioning of the heat pump. The authors have developed experimental hydrothermal and geothermal heat pump systems to conduct the research. Both collector and ground section of the system have mounted sensors of temperature, pressure and coolant flow velocity. The software for archiving and visualization of obtained data was developed. The research procedure was developed. As part of study, observation data were received and performance efficiency of geothermal and hydrothermal systems was calculated. The comparative analysis of energy systems depending on used renewable energy source was carried out. The conclusion was made that use of hydrothermal heat pump systems is environmentally safe. The data obtained as part of study have great scientific and applied significance for engineering of heat pump energy systems using hydropower potential of the small rivers.
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Sutradhar, Suman. "Restructured Hydrothermal System: Slack bus Management". WSEAS TRANSACTIONS ON POWER SYSTEMS 17 (4.07.2022): 169–76. http://dx.doi.org/10.37394/232016.2022.17.17.
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In order to logically represent the power system, it is necessary to develop a concept to compensate various mathematical imbalances, for which the concept of slack bus came into the picture. But when large system is considered, the overall limit of slack bus is not sufficient to compensate the imbalances. In addition to this, the practical depiction of slack bus does not hold when multiple time intervals are considered in HTS problem. In this research, the concept of slack bus is modified and improved so that it can be used for a large power system in restructured hydrothermal system. Furthermore an improved ABC algorithm, i.e. GOABC is proposed, which provides superior diversity and enhanced convergence compared to ABC algorithm.
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Gayibov, Tulkin, i Bekzod Pulatov. "Optimization of Short-term Modes of Hydrothermal Power System". E3S Web of Conferences 209 (2020): 07014. http://dx.doi.org/10.1051/e3sconf/202020907014.
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Optimal planning of short-term modes of power systems is a complex nonlinear programming problem with many simple, functional and integral constraints in the form of equalities and inequalities. Especially, the presence of integral constraints causes significant difficulties in solving of such problem. Since, under such constraints, the modes of power system in separate time intervals of the considered planning period become dependent on the values of the parameters in other intervals. Accordingly, it becomes impossible to obtain the optimal mode plan as the results of separate optimization for individual time intervals of the period under consideration. And the simultaneous solution of the problem for all time intervals of the planning period in the conditions of large power systems is associated with additional difficulties in ensuring the reliability of convergence of the iterative computational process. In this regard, the issues of improving the methods and algorithms for optimization of short-term modes of power systems containing thermal and large hydroelectric power plants with reservoirs, in which water consumption is regulated in the short-term planning period, remains as an important task. In this paper, we propose the effective algorithm for solving the problem under consideration, which makes it possible to quickly and reliably determine the optimal operating modes of the power system for the planned period. The results of research of effectiveness of this algorithm are presented on the example of optimal planning of daily mode of the power system, which contains two thermal and three hydraulic power plants..
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Xie, Keren, Tiefeng Li, Yanyan Zhang, Shijun Wu i Canjun Yang. "Multiphysics Co-Simulation and Experimental Study of Deep-Sea Hydrothermal Energy Generation System". Journal of Marine Science and Engineering 11, nr 5 (7.05.2023): 994. http://dx.doi.org/10.3390/jmse11050994.
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With the continuous deepening of research on seafloor hydrothermal observations, the demand for a sustainable power supply of observation equipment is increasingly urgent. A kind of device that utilizes the temperature difference near hydrothermal vents to provide power is studied. However, the frequent experiments required for in-depth research on this device contradict the rare opportunities for hydrothermal field experiments and the difficulty in laboratory replication. In response to the above difficulties, a multiphysics co-simulation of the deep-sea hydrothermal energy generation system is studied in this paper. Firstly, the output performance analysis and modeling of the TEG installed in the device under pressure are carried out. An enhanced heat transfer model of the system is proposed for the hydrothermal fluids in the flow channel of the device. Then, the thermoelectric model of TEG and the heat transfer model of the device are jointly simulated by using Fluent and Simulink software. Eventually, the simulation data are compared with the data obtained through experiments. The average absolute of the relative error of the open-circuit voltage is 5.07%, and the maximum one is 6.28%. The corresponding values of the maximum output power are 5.16% and 6.79%, respectively. Therefore, the performance of the hydrothermal thermoelectric power generation system and the correctness of the proposed overall co-simulation model are verified.
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Jena, Chitralekha, i Mousumi Basu. "Group Search Optimization for Fixed Head Hydrothermal Power System". Journal of The Institution of Engineers (India): Series B 98, nr 1 (25.05.2016): 35–41. http://dx.doi.org/10.1007/s40031-016-0234-8.
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Basu, M. "Quasi-oppositional group search optimization for hydrothermal power system". International Journal of Electrical Power & Energy Systems 81 (październik 2016): 324–35. http://dx.doi.org/10.1016/j.ijepes.2016.02.051.
Pełny tekst źródłaRozprawy doktorskie na temat "Hydrothermal power system"
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Xiong, Min. "Short-term generation scheduling in a hydrothermal power system". Thesis, Durham University, 1990. http://etheses.dur.ac.uk/1182/.
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Paredes, Quiñones Miguel [UNESP]. "Metodologia para o planejamento da operação de sistemas hidrotérmicos em mercado elétrico competitivo". Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/87146.
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Neste trabalho foi desenvolvido um modelo baseado em programação linear inteira mista para determinar o custo mínimo da operação de um sistema hidrotérmico de longo prazo em um mercado elétrico competitivo. O modelo é capaz de encontrar os valores ótimos de operação para um período futuro nas usinas térmicas e hidroelétricas, considerando os limites normais e de emergência e as perdas de potência ativa nas linhas de transmissão, para diferentes níveis de carregamento, com múltiplos reservatórios de acumulação e de regulação. Adicionalmente, a previsão da hidrologia foi modelada mediante modelo SARIMA para o período de análise, considerando o histórico dos dados hidrológicos. O modelo foi implementado na linguagem de modelagem matemática GMPL. O problema de programação linear inteira mista foi resolvido usando o solver GLPSOL. As predições das hidrologias foram feitas na linguagem estatística R. Foi desenvolvida uma interface gráfica para gerenciar o modelo em GMPL, a previsão hidrológica em R e o solver GLPSOL na linguagem Qt. Desta forma é possível adicionar novos modelos, alterar dados do modelo e visualizar os resultados. Todas as linguagens e softwares usados são livres de distribuição e modificação. Para o modelo desenvolvido foram analisados os seguintes casos: sistema de 6 barras; sistema uninodal brasileiro e sistema interligado peruano. Os resultados obtidos foram comparados com os resultados encontrados na literatura com o objetivo de validar a proposta deste trabalho
In this work developed a model based on mixed integer linear programming to determine the minimum cost of operation of a hydrothermal system in a long-term competitive electricity market. The model is able to find the optimal values of operation for a future period in thermal and hydroelectric power plants, considering the normal and emergency limits and the active power losses in transmission lines, for different loading levels, with multiple storage reservoirs and dams. In addition, predicting the hydrology was modeled by the SARIMA model for the period of analysis, considering the hydrological historical data. The model was implemented in the language of mathematical modeling GMPL. The mixed linear integer programming problem was solved using solver GLPSOL. The predictions in the hydrology using the statistical language R. It was developed a graphical interface to manage the GMPL model, the hydrologic forecasting, and solver GLPSOL in Qt graphical language. By this way, is possible to add new models, change the data of the model and view the results. All languages and software used are free to distribute and modify. For the model developed the following cases were analyzed: 6 bar system; Brazilian uninodal system and Peruvian interconnected system. The results were compared with results in the literature in order to validate the proposal of this work
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Orero, Shadrack Otieno. "Power systems generation scheduling and optimisation using evolutionary computation techniques". Thesis, Brunel University, 1996. http://bura.brunel.ac.uk/handle/2438/4869.
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Optimal generation scheduling attempts to minimise the cost of power production while satisfying the various operation constraints and physical limitations on the power system components. The thermal generation scheduling problem can be considered as a power system control problem acting over different time frames. The unit commitment phase determines the optimum pattern for starting up and shutting down the generating units over the designated scheduling period, while the economic dispatch phase is concerned with allocation of the load demand among the on-line generators. In a hydrothermal system the optimal scheduling of generation involves the allocation of generation among the hydro electric and thermal plants so as to minimise total operation costs of thermal plants while satisfying the various constraints on the hydraulic and power system network. This thesis reports on the development of genetic algorithm computation techniques for the solution of the short term generation scheduling problem for power systems having both thermal and hydro units. A comprehensive genetic algorithm modelling framework for thermal and hydrothermal scheduling problems using two genetic algorithm models, a canonical genetic algorithm and a deterministic crowding genetic algorithm, is presented. The thermal scheduling modelling framework incorporates unit minimum up and down times, demand and reserve constraints, cooling time dependent start up costs, unit ramp rates, and multiple unit operating states, while constraints such as multiple cascade hydraulic networks, river transport delays and variable head hydro plants, are accounted for in the hydraulic system modelling. These basic genetic algorithm models have been enhanced, using quasi problem decomposition, and hybridisation techniques, resulting in efficient generation scheduling algorithms. The results of the performance of the algorithms on small, medium and large scale power system problems is presented and compared with other conventional scheduling techniques.
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Paredes, Quiñones Miguel. "Metodologia para o planejamento da operação de sistemas hidrotérmicos em mercado elétrico competitivo /". Ilha Solteira, 2012. http://hdl.handle.net/11449/87146.
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Orientador: Rubén Augusto Romero LázaroCoorientador: Marcos Julio Rider Flores
Banca: Jose Roberto Sanches Mantovani
Banca: Secundino Soares Filho
Resumo: Neste trabalho foi desenvolvido um modelo baseado em programação linear inteira mista para determinar o custo mínimo da operação de um sistema hidrotérmico de longo prazo em um mercado elétrico competitivo. O modelo é capaz de encontrar os valores ótimos de operação para um período futuro nas usinas térmicas e hidroelétricas, considerando os limites normais e de emergência e as perdas de potência ativa nas linhas de transmissão, para diferentes níveis de carregamento, com múltiplos reservatórios de acumulação e de regulação. Adicionalmente, a previsão da hidrologia foi modelada mediante modelo SARIMA para o período de análise, considerando o histórico dos dados hidrológicos. O modelo foi implementado na linguagem de modelagem matemática GMPL. O problema de programação linear inteira mista foi resolvido usando o solver GLPSOL. As predições das hidrologias foram feitas na linguagem estatística R. Foi desenvolvida uma interface gráfica para gerenciar o modelo em GMPL, a previsão hidrológica em R e o solver GLPSOL na linguagem Qt. Desta forma é possível adicionar novos modelos, alterar dados do modelo e visualizar os resultados. Todas as linguagens e softwares usados são livres de distribuição e modificação. Para o modelo desenvolvido foram analisados os seguintes casos: sistema de 6 barras; sistema uninodal brasileiro e sistema interligado peruano. Os resultados obtidos foram comparados com os resultados encontrados na literatura com o objetivo de validar a proposta deste trabalho
Abstract: In this work developed a model based on mixed integer linear programming to determine the minimum cost of operation of a hydrothermal system in a long-term competitive electricity market. The model is able to find the optimal values of operation for a future period in thermal and hydroelectric power plants, considering the normal and emergency limits and the active power losses in transmission lines, for different loading levels, with multiple storage reservoirs and dams. In addition, predicting the hydrology was modeled by the SARIMA model for the period of analysis, considering the hydrological historical data. The model was implemented in the language of mathematical modeling GMPL. The mixed linear integer programming problem was solved using solver GLPSOL. The predictions in the hydrology using the statistical language R. It was developed a graphical interface to manage the GMPL model, the hydrologic forecasting, and solver GLPSOL in Qt graphical language. By this way, is possible to add new models, change the data of the model and view the results. All languages and software used are free to distribute and modify. For the model developed the following cases were analyzed: 6 bar system; Brazilian uninodal system and Peruvian interconnected system. The results were compared with results in the literature in order to validate the proposal of this work
Mestre
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Kadowaki, Makoto. "Modelo de programação da operação de sistemas hidrotérmicos predominantemente hidrelétricos . = Short term generation scheduling of hydro dominant hydrothermal systems". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261160.
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Orientador: Takaaki OhishiTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Esta tese apresenta um modelo para a programação da operação de sistemas hidrotérmicos predominantemente hidrelétricos. A formulação matemática adota uma representação detalhada das usinas hidrelétricas, do sistema de reservatórios, e leva também em conta requisitos de mercado e de operação. As usinas hidrelétricas são modeladas incluindo suas unidades geradoras (conjunto turbina-gerador), com os seus rendimentos representados pela curva colina, e considerando ainda os custos de partida/ parada das unidades geradoras. O sistema de reservatórios leva em conta a rede de reservatórios, considerando os tempos de viagem da água entre reservatórios, limites operativos de armazenamento, turbinagem e defluência, e considera também rampas de geração para atendimento de restrições ambientais. Em termos de mercado, o modelo considera a uma curva de carga global em base horária, e em termos de requisitos operativos considera restrições de reserva girante e conexão de usinas hidrelétricas a mais de um barramento. Como critério de otimização adota-se a minimização de perdas de geração na operação das hidrelétricas e dos custos de partidas e paradas de unidades geradoras. Como resultado desta modelagem, tem-se um problema de otimização determinístico não linear inteiro misto de grande porte. Este problema de otimização foi tratado por uma abordagem híbrida, combinando metodologias baseadas em Programação Dinâmica, Método de Newton, Método de Relaxação das Restrições, Método de Conjuntos Ativos e heurísticas. A metodologia foi aplicada a um estudo de caso baseado na programação de operação do Sistema Interligado Nacional, composto de 94 usinas hidrelétricas, 447 unidades geradoras e considerando um horizonte de uma semana
Abstract: This thesis presents a hydro unit commitment model for predominantly hydroelectric hydrothermal systems. The model employs a detailed representation of the hydro plants, the reservoir system, and taking into account the load demand and operational requirements. The hydro plants are modeling at hydro generation unit (turbine-generator set) level, in which its efficiency is represented by the hill curves, and also considering the hydro-unit start-up / shutdown costs. The reservoir system considers the network of reservoirs, the lead time of water displacement between reservoirs, the operational limits of storage, discharge, and generation ramp rate. The load demand is represented on hourly (or less) time base, the requirements of spinning reserve are taking into account, and the model also allows the representation of plants connected to more than one transmission sub-system. The mathematical formulation obtained is a mixed integer nonlinear optimization problem. The optimization problem is treated by hybrid method, combining methodologies based on Dynamic Programming, Newton Method, Active Set Method, and heuristics. The methodology is applied to a test system based on the Brazilian Interconnected System, composed of 94 hydro plants, with 447 hydro generation units, and considering a time horizon of one week
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
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Ebert, Priscila Silveira. "Modelagem de sistemas hidrotérmicos interligados utilizando dinâmica de sistemas". Universidade Federal do Pampa, 2015. http://dspace.unipampa.edu.br:8080/xmlui/handle/riu/743.
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A matriz de energia elétrica brasileira é composta predominantemente por geração hídrica, este fato faz com que o país dependa do regime de afluências. A fonte de geração complementar para suprir a demanda do país em períodos de baixa afluência é a geração de energia a partir de usinas termelétricas, porém cada vez que estas usinas entram em operação o custo marginal de curto prazo da energia sobe. O país possui um grande sistema elétrico interligado, em que é possível realizar o intercâmbio de energia entre as regiões, porém a decisão sobre o despacho e o intercâmbio de energia é tarefa complexa. Esta decisão é tomada pelo Operador Nacional do Sistema Elétrico (ONS) com auxílio dos modelos Newave e Decomp, porém estes modelos são complexos e pouco flexíveis, além da lenta resposta a uma determinada ação. Devido a este fato, o presente trabalho busca uma alternativa para auxiliar no teste de ações e na obtenção de respostas futuras a partir de ações adotadas no presente, com um tempo rápido de resposta. Para isto é utilizada a técnica de Dinâmica de Sistemas que busca modelar as relações de causa-efeito realimentadas, visando compreender as implicações sobre o desempenho do sistema sob estudo. O modelo elaborado leva em consideração as principais variáveis que compõem o sistema elétrico brasileiro como Energia Natural Afluente (ENA), Geração Termo, Geração Hidro, Geração eólica, Carga de Energia, Energia armazenada e o Custo Variável Unitário (CVU) das unidades térmicas. Os principais objetivos são compreender o funcionamento do Sistema Interligado Nacional, auxiliar na decisão de utilizar a água dos reservatórios no presente ou economizar para o futuro, bem como obter as consequências dessa decisão no Preço de Liquidação das Diferenças(PLD) e no intercâmbio de energia entre os subsistemas, além de analisar a influência de diferentes cenários de ENA e Geração eólica no sistema.Com o modelo desenvolvido foi possível mostrar a importância do intercâmbio de energia entre os subsistemas a fim de evitar possíveis situações de déficit. A principal contribuição do modelo foi obtida com a aplicação de cenários de ENA e Geração Eólica, com um acréscimo de 10% na curva de ENA verifica-se a redução de diversas situações com déficit e do PLD, enquanto que com uma redução de 10% na curva de ENA os períodos com déficit e o PLD alto aumentaram significativamente.
The Brazilian energy matrix is composed predominantly hydroelectric generation, this fact makes the country dependent on the inflow regime. The source of additional generation to meet the country's demand in low peak times is the generation of energy from thermal power plants, but increasingly these plants become operational marginal cost of short-term energy rises. The country has a large interconnected power system, it is possible to carry out the exchange of energy between regions, but the decision about dispatch and exchange of energy is a complex task. This decision is made by the National Electric System Operator (ONS) with the help of Newave and Decomp models, but these models are complex and inflexible, besides the slow response to a particular action. Due to this fact, this paper seeks an alternative to aid in the stock test and obtaining future responses from actions taken in the present, with a fast response time. For this is used the system dynamics technique that seeks to model the relationships of cause and effect fed back, to understand its effects on the performance of the system under study. The elaborate model takes into account the main variables that make up the Brazilian electrical system as Energy Affluent Natural (ENA), Generation Instrument, hydro generation, wind generation, power load, stored energy and the Variable Cost per Unit (CVU) of thermal units. The main objectives are to understand the operation of the National Interconnected System, assist in the decision to use water from reservoirs in the present or save for the future and get the consequences of this decision in the Settlement of Differences Price (PLD) and energy exchange between subsystems, and analyze the influence of different scenarios of ENA and wind generation in the system. With the developed model was possible to show the importance of the exchange of energy between the subsystems in order to avoid possible deficit situations. The main standard contribution was obtained by applying ENA scenarios and Generation Wind, with a 10% increase in ENA curve was possible to eliminate various situations with deficit and reduce the PLD, whereas with a 10% reduction in the curve ENA periods with high deficit and the PLD increased significantly.
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Sales, Alexandra Lucio. "Perspectivas de evolução, a medio e longo prazos, do parque gerador de energia eletrica no Brasil". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265521.
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Orientador: Sergio Valdir BajayDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo Neste trabalho é feita uma análise do planejamento da expansão do parque gerador de energia elétrica do Brasil, a partir da caracterização do cenário atual do setor elétrico brasileiro. Procurou-se resgatar o histórico dos estudos de médio e de longo prazos, realizados desde a década de 1960 e que serviram de premissas para expansão do setor. O planejamento de sistemas hidrotérmicos de potência pode ser representado matematicamente por uma função objetivo, que, sujeito à certas restrições, sinalize uma operação ótima desses sistemas e suas necessidades de expansão. Diversos tipos de modelos computacionais podem ser utilizados como valiosas ferramentas de auxílio à tomada de decisão na solução deste problema. Este trabalho discute as principais estratégias de solução que vêm sendo aplicadas neste contexto. Em uma outra parte deste trabalho, foram analisadas diversas bases de dados, nacionais e internacionais, que disponibilizam informações a respeito de custos e de tendências tecnológicas para a geração de energia elétrica. A partir destas análises, foi feito um levantamento dos parâmetros que formam o custo unitário de geração, que permitiu a formulação de três cenários: "baixo", "referência" e "alto", que simulam, através de planilhas econômico-financeiras, condições de formação de baixos custos unitários de geração, custos mais prováveis e altos custos unitários de geração, respectivamente. Por fim, são analisados os resultados obtidos da planilha sob o aspecto da competitividade das tecnologias que complementam o parque hidráulico brasileiro. O estudo desenvolvido neste trabalho mostra a importância dos parâmetros econômico-financeiros e das políticas energéticas adotadas para o setor, dado que estes afetam diretamente o custo de geração e, conseqüentemente, os preços praticados no mercado de energia elétrica.
Abstract: An evaluation is carried out in this thesis about medium and long-term generation planning in the Brazilian electric power system, since the 1960's. Planning of hydrothermal power systems can be represented mathematically by an objective function, which, subject to certain constraints, indicates an optimal operation of these systems and their expansion needs. Several types of computer models can be used as valuable tools in the decisions making process involved in the solution of this problem. The main solution strategies which have been applied so far are discussed here. In another part of this thesis, several data basis, both national and international, providing information about electricity generation costs and technological trends, have been assessed. From these analysis, the main parameters that form the generation unit cost were identified, allowing the formulation of three scenarios - "low", "reference" and "high", which simulate, through economic-financial data sheets, low, more likely and high unit costs, respectively. The results obtained from the data sheets provide valuable insights about the competitive positions of the technologies that complement hydro power in Brazil. This thesis highlights the importance of economic-financial parameters and the public policies adopted for the power sector, since they affect directly generation unit cost and, consequently, the prices practiced in the electricity market.
Mestrado
Mestre em Planejamento de Sistemas Energéticos
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Souza, Heverton Reis. "Impacto da representação da rede elétrica no planejamento da operação de médio prazo". Universidade Federal de Juiz de Fora, 2014. https://repositorio.ufjf.br/jspui/handle/ufjf/867.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O Sistema Interligado Nacional (SIN) possui características peculiares que o torna diferente de qualquer outro no mundo, como por exemplo, predominância de usinas hidrelétricas e uma extensa rede de transmissão. Estas características, aliadas a incerteza nas afluências futuras, conduz a necessidade da realização de vários estudos na área de planejamento da operação. O planejamento da operação energética tem por objetivo determinar metas de geração hidráulica e térmica, de forma a atender o mercado consumidor de energia, com confiabilidade e economicidade, utilizando da melhor forma possível os recursos energéticos disponíveis. Para este propósito são utilizados modelos matemáticos que buscam a minimização do custo total esperado de operação do sistema, dentro de um determinado horizonte de planejamento, utilizando diferentes níveis de detalhamento. O objetivo principal deste trabalho é avaliar alguns impactos da modelagem do sistema elétrico no problema de planejamento da operação de médio prazo. Neste sentido, o sistema de transmissão é representado em sua forma completa, através de equações não lineares que modelam os fluxos de potência ativa e reativa em cada circuito que compõe o sistema elétrico. Além disso, são considerados os limites de tensão nas barras, assim como o limite de carregamento dos circuitos para cada patamar de carga. As usinas hidrelétricas e termelétricas são representadas de forma individualizada, e a função de produtibilidade é modelada através de polinômios de quarto grau. O modelo proposto utiliza Funções de Custo Futuro (FCF) pré-calculadas por um programa de planejamento da operação de médio/longo prazo, baseado em sistemas equivalentes de energia. Neste trabalho foram utilizadas as FCF produzidas pelo programa Modelo de Despacho Hidrotérmico (MDDH), desenvolvido pela UFJF. Entretanto, é importante destacar que outro modelo de decisão estratégica, baseado em sistemas equivalentes de energia, poderia ser adotado para gerar as FCF utilizadas neste trabalho. A metodologia proposta neste trabalho foi avaliada através do estudo de casos tutoriais e de médio porte, objetivando demonstrar os impactos da representação do sistema de transmissão no custo total esperado de operação do sistema e diferenças na estratégia de operação do mesmo.
The Brazilian Interconnected System has unique characteristics that make it different of any other in the world, such as predominance of hydroelectric power plants and an extensive transmission system. These features, combined with uncertainty in future inflows, leads to necessity of conducting several studies on planning of the operation. The energy operation planning aims to determine targets for hydraulic and thermal generation to meet the consumer energy market with reliability and economy, as well as possible using the available energy resources. For this purpose mathematical models that aims to minimize the expected total cost of the system operation, within a given planning horizon, using different levels of detail are used. The main objective of this work is to evaluate some impacts of the transmission system modeling in the long-term operation planning problem. In this sense, the transmission system is included in its complete form, using nonlinear equations that model the active and reactive power flow in the electrical system. In addition, some operation limits are considered, such as bus voltage limits and power flow limits in the transmission lines and transformers, for each load level. The hydroelectric and thermoelectric plants are represented in an individual form and the producibility function is modeled by fourth degree polynomials. The proposed model uses cost-to-go functions calculated from a long term operation planning program based on equivalent energy systems. In this work the cost-to-go functions produced by MDDH program were used. This program was developed by the Federal University of Juiz de Fora (UFJF). However, it is important to point out that any other model of strategic decision, based on equivalent energy systems, could be used to generate the cost-to-go functions. The proposed methodology is evaluated and validated through the study of medium scale systems and tutorial systems. The main objective is to demonstrate the impact of the detailed transmission system modeling in the total system operating expected total cost and identify differences in operation strategy.
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Ramos, Tales Pulinho. "Modelo individualizado de usinas hidrelétricas baseado em técnicas de programação não linear integrado com o modelo de decisão estratégica". Universidade Federal de Juiz de Fora (UFJF), 2011. https://repositorio.ufjf.br/jspui/handle/ufjf/3039.
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FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Nos horizontes de médio e longo prazo, o modelo computacional oficial, denominado NEWAVE, para o planejamento da operação do Sistema Interligado Nacional (SIN) no Brasil é baseado na técnica de Programação Dinâmica Dual Estocástica (PDDE) e em sistemas equivalentes de energia. Para se produzir estimativas individualizadas das usinas hidrelétricas, omodelooficialdoSIN,SUISHI-O,utilizaheurísticasoperativasbaseadasnabuscapelaoperação em paralelo por faixas dos reservatórios e consideração das não linearidades nas restrições operativas associadas ao problema. Ou seja, as decisões operativas geradas pela PDDE para os sistemasequivalentessãodesagregadasentreassuasusinashidrelétricas. OsdoismodeloscomputacionaisforamdesenvolvidospeloCentrodePesquisasdeEnergiaElétrica(CEPEL),sendo que o modelo NEWAVE produz Funções de Custo Futuro (FCFs) mensais através da técnica dePDDEeestasfunçõessãoutilizadaspelomodeloSUISHI-O,responsávelpeladesagregação das decisões associadas aos sistemas equivalentes entre as suas usinas hidrelétricas. Este trabalho propõe um Modelo Individualizado de Usinas Hidrelétricas (MIUH) baseado em programação não linear para o planejamento mensal da operação utilizando-se as FCFs produzidas pelo modelo NEWAVE ou outro modelo de decisão estratégica. O MIUH utiliza uma representação alternativa aos polinômios de quarto grau associados aospolinômioscota-vazãobaseadanafunçãologística,comoobjetivodeestabilizaroprocesso de convergência do modelo de otimização não-linear. Foi desenvolvida uma plataforma computacional robusta, capaz de utilizar o mesmo conjuntodedadosdosmodeloscomputacionaisoficiaisdoSIN,disponibilizadomensalmentepelo Operador Nacional do Sistema (ONS). Com isto, possibilitou-se a comparação dos resultados obtidospelomodeloSUISHI-OcomosobtidospeloMIUH.Paraisto,foramutilizadososdados referentes ao Programa Mensal de Operação de Janeiro de 2011. Esta plataforma está desenvolvida em C++/Java para os sistemas operacionais Windows e LINUX, sendo que utiliza o modelo LINGO para a solução dos problemas de otimização não linear. O MIUH é capaz de representar a maioria dos detalhes associados ao problema de planejamento da operação, como, por exemplo, a expansão dos parques térmicos e hidráulicos, o crescimentodomercado,asrestriçõesdevazãomínimaobrigatória,ovolumemínimoparavertimento nas usinas com reservatório, a geração de pequenas usinas, os limites de intercâmbio entre os subsistemas, os diversos patamares de déficit de energia, a evaporação e o enchimento do volume morto.
On the horizons of long term,the official computing model to the planning of the operation of the National Grid (NG) in Brazil is based in the technique of Stochastic Dual Dynamic Programming (SDDP) and using equivalent systems of energy. In order to produce individual estimates of the hydro plants, NG’s official model uses operative heuristics which search for the operation in parallel of the reservoirs and consider the nonlinear and operative restrictions associated to the problem. In other words, the operative decisions generated by SDDP to the energy equivalent systems are disaggregated between its own hydro plants. Both computing models are developed by CEPEL. The model NEWAVE produces cost-togofunctionmonthlythroughSDDPtechniqueandthesefunctionsarealsousedbytheSUISHIO model (developed by CEPEL), responsible for the disaggregation of the decisions associated to the equivalent systems between its hydro plants. The aim of this thesis is to propose an Individualized Model of Hydro Plants (IMHP) based on nonlinear programming for the monthly planning of the operation using the cost-to-go functions produced by the NEWAVE model. IMHP uses an alternative representation of fourth degree polynomials associated to the outflow-level downstream relationship based on the logistic function in order to stabilize the convergence of the nonlinear optimization model. It has been developed a robust computing platform which is capable of using the same set of datas of the official computing models of NG, which is monthly available by the Independent System Operator (ISO). Consequently, it was possible to compare the results generated by SUISHI-O model with the ones generated by IMHP. In order to do that, the datas regarding the Monthly Program of Operation of January 2011 were used. This platform is developed in C++/Java to the operational systems Windows and LINUX, once that the model LINGO is used to solve problems of nonlinear optimization. IMHP is able to represent the majority of the details associated to the problem, such as, for example, the expansion of thermal and hydraulic parks, the market growth, and the minimum obligatory outflow restrictions, the minimum volume to be transfered in hydro plants with reservoirs, the generation of small hydro plants, the limits of exchange between equivalent systems of energy, various levels of deficit of energy, the evaporation and the act of filling the dead volume.
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BRIGATTO, ARTHUR DE CASTRO. "ENSURING RESERVE DEPLOYMENT IN HYDROTHERMAL POWER SYSTEMS PLANNING". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27876@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE EXCELENCIA ACADEMICA
Atualmente a metodologia correspondente ao estado da arte utilizada para o planejamento de médio-/longo-prazo da operação de sistemas elétricos de potência é a Programação Dual Dinâmica Estocástica (PDDE). No entanto, a tratabilidade computacional proporcionada por este método ainda requer simplificaçõeses consideráveis de detalhes de sistemas reais de maneira a atingir performaces aceitáveis em aplicações práticas. Simplificações feitas no estágio de planejamento em contraste com a implementação das decisões podem induzir políticas temporalmente inconsistentes e, consequentemente, um gap de sub-otimalidade. Inconsisência temporal em planejamento hidrotérmico pode ser induzida, por exemplo, ao assumir um coeficiente de produtividade constante para as hidrelétricas, ao agregar os reservatórios, ao negligenciar a segunda lei de Kirchhoff e neglienciando-se critérios de segurança em modelos de planejamento. As mesmas restrições são posteriormente consideradas na etapa de implementação do sistema. Esse fato pode estar envolvido com esvaziamento não planejado de reservatórios e entregabilidade inadequada de reservas girantes. Ambos podem levar a altos custos operacionais. Além disso, o sistema pode ficar exposto a um risco sistêmico de racionamento e em última instâcia, blackouts. O gap de sub-otimalidade pode também levar a distorções em mercados de energia. Assim, é razoável que as consequências da inconstência temporal em sistemas hidrotérmicos sejam estudadas. Nesse sentido, este trabalho propõe uma extensão de trabalhos já realizados relacionados à inconsistência temporal para medir os efeitos de simplificações de modelagem em modelos de planejamento resolvidos pela PDDE. A abordagem proposta consiste em usar um modelo simplificado para o planejamento do sistema, que é feito pela avaliação da função de recurso, e um modelo detalhado para a sua operação. Estudos de caso envolvendo simplificações em modelagem de linhas de transmissão e critérios de segurança são realizados. No entanto, o foco deste trabalho se dará na segunda fonte, já que a mesma apresenta maior complexidade na caracterização do efeito. No entanto, a incorporação de critérios de segurança é um grande desafio para operadores de sistemas elétricos, pois o tamanho do modelo tende a crescer exponencialmente quando critérios de segurança reforçados são aplicados. Motivado por isso, o principal objetivo deste trabalho é propor uma nova abordagem ao problema que permite que critérios de segurança possam ser incorporados em modelos de planejamento e consequentemente garantir a entregabilidade de reservas em políticas de planejamento. A formulação do problema é uma extensão multiperiodo e estocástica the modelos de Otimização Robusta Ajustável que já foram propostos na literatura para resolver o problema relacionado à dimensionalidade para um período. A metodologia de solução involve um algoritmo híbrido Robusto-PDDE que por meio do compartilhamento de estados de contingência ativos entre os períodos e cenários de afluência é capaz de atingir tratabilidade computacional. Com a nova abordagem proposta, é possível (i) resolver o problema de agendamento ótimo das reservas em sistemas hidrotérmicos garantindo a entregabilidade das reservas em um critério n - K e (ii) calcular o custo e os efeitos negativos de se negligenciar critérios de segurança no planejamento.
The current state of the art method used for medium/long-term planning studies of hydrothermal power system operation is the Stochastic Dual Dynamic Programming (SDDP) algorithm. The computational savings provided by this method notwithstanding, it still relies on major system simplifications to achieve acceptable performances in practical applications. Simplifications in the planning stage in contrast to the actual implementation might induce time inconsistent policies and, consequently, a sub-optimality gap. Time inconsistency in hydrothermal planning might be induced by, for instance, assuming a constant coefficient production for hydro plants, reservoir aggregation, neglecting Kirchhoff s voltage law, and neglecting security criteria in planning models, which are then incorporated in implementating models. Unaccounted for reservoir depletion and inadequate spinning reserve deliverability situations that were observed in the Brazilian power system might be induced by time inconsistency. And this can lead to higher operational costs. Both these consequences are utterly negative since they pose the system to a great systemic risk of energy rationing or ultimately, system blackouts. In addition, the suboptimility gap may also lead to energy markets distortions. Hence, it seems reasonable that further investigations on consequences of time inconsistency in hydrothermal planning should be undertaken. Along these lines, this work proposes an extension to previous work on the subject of time inconsistency to measure the effects of modeling simplifications in the SDDP framework for hydrothermal operation planning. The approach consists of using a simplified model for planning the system, which is done by means of the assessment of the recourse (cost-to-go) function, and a detailed model for its operation (implementation of the policy). Case studies involving simplifications in transmission lines modeling and in security criteria are carried out. Nevertheless, the focus of this work is on the later source as it is more difficult to address due to the complexity involved in the characterization of this effect. However, incorporating security criteria in planning models poses a major challenge to system operators. This is because the size of the model tends to grow exponentially as tighter security criteria are adopted. Motivated by this, the main objective of this work is to propose a new framework that allows security criteria to be incorporated in planning models and consequently ensure reserve deliverability in planning policies. The problem formulation is a multiperiod stochastic extension of Adjustable Robust Optimization (ARO) based models already proposed in literature to successfully address the dimensionality issue regarding the incorporation of security criteria n - K and its variants. The solution methodology involves a hybrid Robust-SDDP algorithm that by means of sharing active contingency states amongst periods and possible inflow scenarios in the SDDP algorithm is capable of achieving computational tractability. Then, with the proposed approach it is possible to (i) address the optimal scheduling of energy and reserve in hydrothermal power systems ensuring reserve deliverability under an n - K security criterion and (ii) assess the cost and side effects of disregarding security criteria in the planning stage.
Książki na temat "Hydrothermal power system"
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(Tokyo, Japan) Enerugī Sōgō Kōgaku Kenkyūjo. Kankyō tekigōata, kōkōritsu bainarī hatsuden no gijutsu kaihatsu seika hōkokusho. [Tōkyō-to Chiyoda-ku]: Kankyōshō, 2013.
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N, Mathur G., i India. Central Board of Irrigation and Power., red. Renovation, modernisation, and life extension of thermal power plants: Manual. New Delhi: Central Board of Irrigation and Power, 2003.
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World Clean Energy Conference (1991 Geneva, Switzerland). Cleaner energy for sustainable development: Proceedings of the World Clean Energy Conference, World Energy Coalition for the global energy charter : Geneva International Conference Centre, 4-7 November 1991. Zürich: Cercle mondial du consensus = World Circle of the Consensus, 1991.
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Sardar Sarovar (Narmada) Project. New Delhi: Library of Congress Office, 1994.
Znajdź pełny tekst źródłaCzęści książek na temat "Hydrothermal power system"
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Sharma, Khushboo, Hari Mohan Dubey i Manjaree Pandit. "Short-Term Hydrothermal Scheduling Using Bio-inspired Computing: A Review". W Nature Inspired Optimization for Electrical Power System, 115–29. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4004-2_9.
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Zhang, Bu-han, Junfang Li, Yan Li, Chengxiong Mao, Xin-bo Ruan i Jianhua Yang. "Research on Multi-Agent Parallel Computing Model of Hydrothermal Economic Dispatch in Power System". W Advances in Neural Networks – ISNN 2009, 1160–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01513-7_129.
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Padmini, S., C. Christober Asir Rajan i Pallavi Murthy. "Application of Improved PSO Technique for Short Term Hydrothermal Generation Scheduling of Power System". W Swarm, Evolutionary, and Memetic Computing, 176–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-27172-4_22.
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Thiagarajan, Y., Baburao Pasupulati, Gabriel Gomes de Oliveira, Yuzo Iano i Gabriel Caumo Vaz. "A Simple Approach for Short-Term Hydrothermal Self Scheduling for Generation Companies in Restructured Power System". W Proceedings of the 7th Brazilian Technology Symposium (BTSym’21), 396–414. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08545-1_38.
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Nieva, David, Rosa María Barragán i Víctor Arellano. "Geochemistry of Hydrothermal Systems". W Power Stations Using Locally Available Energy Sources, 61–78. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7510-5_306.
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Christensen, G. S., M. E. El-Hawary i S. A. Soliman. "Economic Coordination of Hydrothermal—Nuclear Systems". W Optimal Control Applications in Electric Power Systems, 55–68. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2085-0_4.
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Christensen, G. S., i S. A. Soliman. "Long-Term Optimal Operation of Hydrothermal Power Systems". W Optimal Long-Term Operation of Electric Power Systems, 183–295. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-5493-2_7.
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Carranza, Walter A., Wilfredo C. Flores, Harold R. Chamorro, Margarita M. Diaz-Casas, Roozbeh Torkzadeh, Francisco Gonzalez-Longatt, Wilfredo Sifuentes, Vijay K. Sood i Wilmar Martinez. "Impact of the Photovoltaic Integration on the Hydrothermal Dispatch on Power Systems". W Energy Systems in Electrical Engineering, 397–434. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6456-1_17.
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Meng, X., H. Zhang, X. Yang i W. Tan. "Fast Synthetic GA Combined with BP - - Application to Short-Term Economic Dispatch of Hydrothermal Power Systems". W Computational Intelligence in Systems and Control Design and Applications, 163–70. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-9040-7_15.
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Durga, Ikkurthi Kanaka, Suresh Alapati i Srinivasa Rao Sunkara. "Facile Hydrothermal Synthesis of CuS/MnS Composite Material Improved the Power Conversion Efficiency of Quantum-Dot Sensitized Solar Cells". W Hybrid Intelligence for Smart Grid Systems, 115–27. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003143802-7.
Pełny tekst źródłaStreszczenia konferencji na temat "Hydrothermal power system"
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Guan, Xiaohong, Peter B. Luh, Houzhong Yan i Peter Rogan. "A New Algorithm for Hydrothermal Power System Scheduling". W 1992 American Control Conference. IEEE, 1992. http://dx.doi.org/10.23919/acc.1992.4792497.
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Carvalho, Fabiano S., Gelson Cruz, Juliana Felix i Fabrizzio Soares. "Computational Intelligence Platform for Hydrothermal Power System Auction Models". W 2020 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE). IEEE, 2020. http://dx.doi.org/10.1109/ccece47787.2020.9255804.
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Parmar, K. P. Singh, S. Majhi i D. P. Kothari. "Automatic generation control of an interconnected hydrothermal power system". W 2010 Annual IEEE India Conference (INDICON). IEEE, 2010. http://dx.doi.org/10.1109/indcon.2010.5712663.
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Abraham, R. J., D. Das i A. Patra. "AGC of a hydrothermal system with thyristor controlled phase shifter in the tie-line". W 2006 IEEE Power India Conference. IEEE, 2006. http://dx.doi.org/10.1109/poweri.2006.1632529.
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Ferreira, V. H., i G. H. C. Silva. "Natural optimization applied to medium-term hydrothermal coordination". W 2011 16th International Conference on Intelligent System Applications to Power Systems (ISAP). IEEE, 2011. http://dx.doi.org/10.1109/isap.2011.6082235.
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Yare, Y., i G. K. Venayagamoorthy. "GMS considering uncertainty in wind power in a wind-hydrothermal power system". W Energy Society General Meeting. IEEE, 2010. http://dx.doi.org/10.1109/pes.2010.5589802.
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Ding, Qiang, Jing-yang Zhou, Yi Pan, Qiang Li, Bin Han, Xiao-lei Li, Xia-ming Guo i Yi Sun. "Coordinative Optimization Model Based on MILP for Hydrothermal Power System". W 2012 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2012. http://dx.doi.org/10.1109/appeec.2012.6307013.
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Sahin, Cem, Zuyi Li, Mohammad Shahidehpour i Ismet Erkmen. "Impact of natural gas system on risk-constrained midterm hydrothermal scheduling". W 2013 IEEE Power & Energy Society General Meeting. IEEE, 2013. http://dx.doi.org/10.1109/pesmg.2013.6672097.
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Zhu, Jizhong, Xiaofu Xiong, Kwok Cheung, Bin Sun i Cheng Lin. "An Approach of Economic Dispatch in the Practical Hydrothermal Power System". W 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5749027.
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