A plan for integrating modeling techniques and improving hydroelectric plant performance is presented. The plan begins with defining and establishing basic plant modeling parameters from the physical plant description. Guidelines for forming linear or nonlinear mathematical models are developed and the plan culminates in the determination of settings for P-I-D control which achieve optimum plant performance. Mathematical models are developed for the hydroelectric plant components -- the penstock, the hydraulic turbine (specifically a Francis turbine), the generator with its connected electrical system, and the control system. A unique method for characterizing turbine performance from a hill diagram is presented. Stability regions for linear models are determined and control settings which result in optimum plant performance are established. Settings associated with high derivative gains are indicated as giving optimum performance when a linear plant model is used. Nonlinear simulations at various operating conditions reveal that less lively gains must be used for the required gate motion to be achievable. For the representative plant model studied, the optimum governor settings resulted in a 7 percent improvement over other recommended P-I-D settings while satisfying gate speed constraints which the other recommended settings violated. The benefit of this work is in an improved ability to develop and utilize appropriate mathematical models for a hydroelectric plant and in the determination of control settings which improve plant performance. / Ph. D.

Maintenance of power plants is aimed at extending the life and reducing the risk of sudden breakdown of power generating units. Traditionally, power generating units have been scheduled for maintenance in periods to ensure that the demand of the system is fully met and the reliability of the system is maximized. However, in a deregulated power industry, the pressure of maintaining generating units is also driven by the potential revenue received by participating in the electricity market. Ideally, hydropower generating units are required to operate during periods when electricity prices are high and to be able to be taken offline for maintenance when the price is low. Therefore, determination of the optimum time periods for maintenance of generating units in a power system has become an important task from both a system reliability and an economic point of view. Due to the extremely large number of potential maintenance schedules, a systematic approach is required to ensure that optimal or near-optimal maintenance schedules are obtained within an acceptable timeframe. Metaheustics are high-level algorithmic frameworks that aim to solve combinatorial optimisation problems with a large search space in a reasonable computational run time. Inspired by the foraging behavior of ant colonies, Ant Colony Optimisation (ACO) is a relatively new metaheuristic for combinatorial optimisation. The application of ACO to a number of different applications has provided encouraging results when applied to scheduling, including the job-shop, flow-shop, machine tardiness and resource-constrained project scheduling problems. In this thesis, a formulation is developed that enables ACO to be applied to the generalized power plant maintenance scheduling optimisation (PPMSO) problem. The formulation caters for all constraints generally encountered as part of real-world PPMSO problems, including system demands and reliability levels, precedence rules between maintenance tasks, public holidays and minimum outage durations in the case of shortening of maintenance tasks. As part of the formulation, a new heuristic and a new local search strategy have been developed. The new ACO-PPMSO formulation has been tested extensively on two benchmark PPMSO problems from the literature, including a 21-unit and a 22-unit problem. It was found that the ACOPPMSO formulation resulted in significant improvements in performance for both case studies compared with the results obtained in previous studies. In addition, the new heuristic formulation was found to be useful in finding maintenance schedules that result in more evenly spread reserve capacity and resource allocations. When tested using a modified version of the 21-unit and the 22-unit problems, the new local search strategy specifically designed for duration shortening was found to be effective in searching locally for maintenance schedules that require minimal shortening of outage duration. The ACO-PPMSO formulation was also successfully able to cater for all constraints as specified in both original and the modified versions of the two benchmark case studies. In order to further test the ACO-PPMSO formulation developed, it was first applied to a scaled-down version of the Hydro Tasmania hydropower system (five power stations) and then to the full system (55 generating units). As part of the studies, the ACO-PPMSO formulation was linked with the simulation model used by Hydro Tasmania to assess the impact of various maintenance schedules on the total energy in storage of the system at the end of the planning horizon, the total thermal generation, the total number of days where the reliability level is not met, as well as the total unserved energy throughout the planning horizon. A number of constraints were considered, including the anticipated system demands, a 30% capacity reliability level, the minimum and maximum durations between related maintenance tasks, the precedence constraints and the minimum outage duration of each task in the case of shortening of maintenance tasks. The maintenance schedule was optimised for the maximum end-of-horizon total energy in storage, the minimum thermal generation and the minimum total outage durations shortened and deferred, under 77 different inflow conditions. The optimal maintenance schedule obtained compared favourably with that obtained by Hydro Tasmania over many years based on experience. Specifically, the ACO-PPMSO schedule results in higher end-of-horizon total energy in storage and satisfies both hard and soft constraints, which overall equates to over $0.5 million dollars of savings when compared to the schedule obtained using the practitioners’ experience and engineering judgment. The ACO-PPMSO algorithm was also shown to be a useful decision-making tool for scheduling maintenance under different circumstances when tested with four scenarios commonly encountered in practical maintenance scheduling problems. In conclusion, the ACO-PPMSO formulation developed, tested and applied as part of this thesis research provides a powerful and flexible means of obtaining optimal or near-optimal maintenance schedules for power plants. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1294672 / Thesis (Ph.D.) -- University of Adelaide, School of Civil and Environmental Engineering, 2007

Submitted by ANDREY MININ MARTIN null (andrey_mm@hotmail.com) on 2016-07-05T15:09:13Z No. of bitstreams: 1 Tese Andrey Martin_UNESP 2016.pdf: 5746818 bytes, checksum: 15e4affba34a9ac0ee840e4d35b09583 (MD5) / Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-07-07T19:50:56Z (GMT) No. of bitstreams: 1 martin_am_dr_assis.pdf: 5746818 bytes, checksum: 15e4affba34a9ac0ee840e4d35b09583 (MD5) / Made available in DSpace on 2016-07-07T19:50:56Z (GMT). No. of bitstreams: 1 martin_am_dr_assis.pdf: 5746818 bytes, checksum: 15e4affba34a9ac0ee840e4d35b09583 (MD5) Previous issue date: 2016-05-24 / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Objetiva-se neste trabalho analisar o Complexo Hidrelétrico Urubupungá, localizado na região fronteiriça entre os estados de São Paulo e Mato Grosso do Sul, constituído por duas hidrelétricas, a Usina Hidrelétrica Engenheiro Souza Dias (Jupiá) e a Usina Hidrelétrica Ilha Solteira. Planejado e executado entre as décadas de 1950 e meados da década de 1970, este empreendimento consolida-se por meio da criação da Comissão Interestadual da Bacia do Paraná-Uruguai, a CIBPU, projeto de planejamento regional articulado por sete estados nacionais, tendo como influência as experiências norte-americanas do Tennessee Valley Authority, TVA. Com o início das obras, a condução do empreendimento centraliza cada vez mais novos organismos, como as Centrais Elétricas de Urubupungá, CELUSA S/A e a partir de 1966 as Centrais Elétricas de São Paulo, CESP, atualmente denominada Companhia Energética de São Paulo. Tais transformações projetam novos interesses de determinados grupos e espaços com as potencialidades advindas da produção energética, ampliando diretamente a forma de se pensar como a constituição deste complexo atrela-se a determinados projetos políticos, econômicos e sociais para uma vasta região do país. Para tal análise, permeado por um debate teórico-metodológico entre progresso, desenvolvimento, história e memória, ligados a um corpo documental amplo, de documentos de comissões e empresas, periódicos de circulação nacional e aparatos audiovisuais, apresentamos como uma série de narrativas se engendraram na execução e no estabelecimento do empreendimento, articulando seu ideário de progresso e uma nova imagem para região, antes, durante e posteriormente a sua realização. Desta forma, interesses privados, disputas pela legitimidade, pelo poder e, assim, memórias foram gestadas ao longo deste período e marcaram a construção do complexo hidrelétrico até seu término na década de 1970, estabelecendo ligações com marcos de memória do passado e deixando desdobramentos para o futuro. / This work aims to analyze the Urubupungá Hydroelectric Complex, located in the border region between the States of São Paulo e Mato Grosso do Sul, it is consisted by two hydroelectric plants, the Engenheiro Souza Dias Hydroelectric Plant (Jupiá), and the Ilha Solteira Hydroelectric Plant. Planned and executed between the decade of 1950 and mid of 1970, this enterprise consolidated itself through the creation of an Interstate Committee of the Paraná-Uruguai basin, that was called CIBPU, and was a regional planning project articulated by seven national States, under the influence the North-American experiences of the Tennessee Valley Authority, TVA.With the beginning of the works, the enterprise focuses more and more on the new organisms, such as Urubupungá Electrics Centrals, CELUSA S/A, and from 1966, The São Paulo Electrics Centrals, CESP, currently named as Energetic Company of São Paulo. These transformations design new interests of certain groups and spaces to the arising potential from the energy production, directly widening the way of thinking about how the complex creation is connected to certain political, economic, and social projects to a wide area of the country. For this analysis, permeated by a theoreticalmethodological debate about progress, development, history and memory linked to an extensive documental source of commissions and companies documents, national periodicals, audio-visual apparatus, it was presented how a series of narratives were engendered in the enterprise implementation and establishment, articulating its ideals of progress and a new image for the region, before, during, and after its completion. In this way, private interests, disputes for the legitimacy and power, and so, memories were made throughout this period and marked the Hydroelectric Complex construction until its completion in early 1970, establishing connections with landmarks of memory from the past and developments for the future. / FAPESP: 2012/16777-1

Submitted by Rosangela Silva (rosangela.silva3@unioeste.br) on 2018-06-25T23:12:30Z No. of bitstreams: 2 Fabricio_S_Silva.pdf: 2675376 bytes, checksum: 37796693d06d9e4b32f5991fd61d17d1 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-06-25T23:12:30Z (GMT). No. of bitstreams: 2 Fabricio_S_Silva.pdf: 2675376 bytes, checksum: 37796693d06d9e4b32f5991fd61d17d1 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-03-09 / Hydroelectric generation is the main source of electricity in Brazil and also in the West and Southwest of Paraná. Year after year the energy matrix has been diversifying, including new sources, such as wind power. However, due to the power accumulation characteristic of hydroelectric plants, this type of source is important for the stability of the electric system. Currently, hydroelectric power corresponds to just over 60% of all power installed in Brazil. Particularly in the West and Southwest of Paraná, this number increases and Paraná's share in the Brazilian matrix is approximately 16% of all installed power. In order to verify the participation of these regions in the hydropower matrix and also their production, a survey was made of the installed potential and the constructive profile of the hydroenergy projects. In addition, the flow and production trends of the Salto Santiago hydroelectric plant in the Iguaçu River basin and the Melissa hydroelectric plant in the Piquiri river basin were verified in the 2003 to 2017 period. Finally, a conceptual map of the western and southwestern regions of Paraná was elaborated with the hydroelectric generation profile. It was noticed by the survey that the regions of the study have great participation in the hydroelectric matrix of Brazil and that its production and the flow of the rivers in the entrance of these remains practically unchanged in the studied period. / A geração hidrelétrica é a principal fonte de energia elétrica no Brasil e do Oeste e Sudoeste do Paraná. Ano após ano a matriz energética vem se diversificando, sendo nela inseridas novas fontes, como por exemplo a eólica. Porém pela característica de acumulação de energia potência das hidrelétricas faz com que este tipo de fonte seja importante para a estabilidade do sistema elétrico. Nos dias atuais a energia hidrelétrica corresponde a pouco mais que 60% de toda potência instalada no Brasil. Em especial na região Oeste e Sudoeste do Paraná, este número aumenta e a participação do Paraná na matriz brasileira é de aproximadamente 16% de toda potência instalada. Para verificar como está a participação destas regiões na matriz hidroenergética e sua produção, foi realizado um levantamento do potencial instalado e do perfil construtivo dos empreendimentos hidroenergéticos. Além disto foi verificada a tendência das vazões e produção no período de 2003 a 2017 da hidrelétrica Salto Santiago na bacia do Rio Iguaçu e a hidrelétrica Melissa na bacia do rio Piquiri. Por fim, foi elaborado um mapa conceitual das regiões Oeste e Sudoeste do Paraná com o perfil da geração hidrelétrica. Concluiu-se pelo levantamento que as regiões do estudo têm grande participação na matriz hidrelétrica do Brasil e que sua produção e a vazão dos rios na entrada destas permanece praticamente inalterada no período do estudado.

Construction of the Pacific Northwest-Pacific Southwest Intertie (also known as the Pacific Intertie) began in 1964, following the culmination of a series of interrelated negotiations which included: 1) the planning for the construction and operation of the Pacific Intertie; 2) the passage of federal legislation that put limits on the export of electricity from the regions where it was generated; and 3) the full ratification of the Columbia River Treaty between the United States and Canada. By 1970, with construction complete, the Pacific Intertie allowed for the movement of more than 4,000,000 kilowatts of power among the electrical systems of British Columbia and eleven Western states, including 243 rural electrical cooperatives, municipal systems, and other public agencies. It had essentially become the backbone of the largest electrical grid in the Western world. In addition to widening the marketing area available to power producers throughout the grid, the Pacific Intertie also integrated the operations of the nation's largest hydropower system (Bonneville Power Administration), the largest privately owned electrical system (Pacific Gas & Electric), and the largest municipal power system (L.A. Department of Water and Power) in the country.

[pt] Entre 2013 e 2015, os níveis dos reservatórios das hidrelétricas brasileiras foram reduzidos pelas secas que atingiram o país. Como consequência, o Operador Nacional do Sistema restringiu a geração hídrica na composição da oferta de energia, aumentando a participação de energia térmica no suprimento da demanda. A restrição da geração hídrica, no entanto, impossibilitou os geradores hidrelétricos de cumprirem seus contratos de venda com a geração própria, forçando-os a comprar energia no mercado de curto prazo e acumular prejuízos. A crise hídrica evidenciou a exposição dos geradores hidrelétricos aos riscos hidrológicos, consequência da modalidade contratual praticada na comercialização de energia hídrica, na qual os geradores assumem todo o risco relacionado à geração. O presente estudo apresenta uma alternativa a este modelo de contratação, de forma que a parte da geração mais exposta aos riscos hidrológicos seja vendida na modalidade que repassa os riscos ao comprador. Para que não haja alteração nos custos totais esperados do comprador com a troca de modelos, o gerador deve pagar um prêmio, refletido na diferença de preços entre as duas modalidades de venda. Os resultados mostraram ganhos em termos de equivalente de certeza e redução considerável do CVaR para o gerador em todos os cenários analisados, porém, o prêmio demonstrou significativa sensibilidade em relação a diversos fatores do modelo. / [en] Between 2013 and 2015, the water levels at storage reservoirs of the Brazilian hydroelectric power plants were reduced by the droughts that impacted the country. As a consequence, the National System Operator restricted hydro power generation in its offer composition, increasing the thermal energy generation to meet the demand. However, this restriction on hydro power energy prevented suppliers from fulfilling their contracts through their own energy production, which forced them to purchase short-term-trade energy and accumulate loss. This water crisis highlighted how exposed hydro power generators are to hydrological risks, a consequence of the contractual modality practiced in this market, in which suppliers take on all of the risk associated with generating power. This study presents an alternative to this contractual model, one in which part of the hydroelectric energy is sold in a modality of contract where risks are borne by the buyer. In exchange, the hydro generator is expected to pay a premium, reflected on the price difference between the two contractual modalities and calculated in a way that would not alter the expected total costs for the buyer. The results showed gains in terms of certainty equivalent and a considerable decrease of CVaR for the hydro generator in all analyzed scenarios. The premium, however, showed significant sensitivity in regards to many factors of the model.

[pt] A tese em questão versa sobre a análise dos impactos da instalação do Aproveitamento Hidrelétrico de Simplício e suas implicações sociais, ambientais e econômicas vivenciadas pela população residente no município de Sapucaia, estado do Rio de Janeiro, por ser a cidade sede do empreendimento, assim como as áreas do seu entorno. Partiu-se para investigação, tomando como pressuposto que a implantação de uma Usina Hidrelétrica, impulsiona uma importante guinada no processo de desenvolvimento local, e tal aspecto, interfere diretamente na dinâmica da vida da população residente. Sendo assim, busca-se saber quais os mecanismos de escuta foram efetivados para garantir a participação popular na época de implantação do empreendimento, e qual a relação estabelecida até os dias atuais com os munícipes, na garantia de uma prática democrática e de participação social, considerando que os impactos promovidos na vida dos sujeitos afetados, são inúmeros, em função das mudanças econômicas, sociais, ambientais, culturais, políticas entre outras na realidade local. O estudo além da continua pesquisa documental e bibliográfica, pautou-se na investigação de cunho qualitativo que permitiu melhor compreender e explicar a dinâmica das relações sociais, e com isto aproximar o pesquisador da realidade investigada. Como coleta de dados, utilizou-se a aplicação de questionários com os sujeitos eleitos e envolvidos com o objeto da pesquisa. O quadro teórico do estudo, foi pautado na perspectiva crítica que permitiu análise, interpretação e descrição dos dados, considerando que tanto os aspectos econômicos, sociais e ambientais presentes a partir do empreendimento hidrelétrico, são decorrentes da estratégia capitalista, que concorre para o desmantelamento e retrocesso das conquistas democráticas, com o alijamento das instâncias de controle social e de incipientes meios de participação popular, elementos que estiveram presentes e impactaram a realidade investigada. / [en] The thesis in question deals with the analysis of the impacts of the installation of the Simplício Hydroelectric Plant and its social, environmental and economic implications experienced by the population living in the municipality of Sapucaia, state of Rio de Janeiro, as it is the host city of the enterprise, as well as the surrounding areas. We started to investigate, assuming that the implantation of a Hydroelectric Plant, drives an important turn in the local development process, and this aspect, directly interferes in the dynamics of the life of the resident population. Therefore, we seek to know which listening mechanisms were put in place to guarantee popular participation at the time of the project s implementation, and what relationship has been established up to the present day with citizens, in guaranteeing a democratic practice and social participation, considering that the impacts promoted in the lives of the affected subjects are numerous, due to the economic, social, environmental, cultural, political changes, among others in the local reality. The study, in addition to the continuous documentary and bibliographic research, was based on a qualitative investigation that allows a better understanding and explanation of the dynamics of social relations, thereby bringing the researcher closer to the investigated reality. As data collection, questionnaires were used with the elected subjects and involved with the research object. The theoretical framework of the study, was based on the critical perspective that allowed analysis, interpretation and description of the data, considering that both the economic, social and environmental aspects present from the hydroelectric enterprise are due to the capitalist strategy, which contributes to the dismantling and retrogression of democratic conquests, with the elimination of instances of social control and incipient means of popular participation, elements that were present and impacted the investigated reality.

The rise of environmental awareness as well as the unstable global fossil fuel market has brought about government initiatives to increase electricity generation from renewable energy sources. These resources tend to be geographically and electrically remote from load centres. Consequently many Distributed Generators (DGs) are expected to be connected to the existing Distribution Networks (DNs), which have high impedance and low X/R ratios. Intermittence and unpredictability of the various types of renewable energy sources can be of time scales of days (hydro) down to seconds (wind, wave). As the time scale becomes smaller, the output of the DG becomes more difficult to accommodate in the DN. With the DGs operating in constant power factor mode, intermittence of the output of the generator combined with the high impedance and low X/R ratios of the DN will cause voltage variations above the statutory limits for quality of supply. This is traditionally mitigated by accepting increased operation of automated network control or network reinforcement. However, due to the distributed nature of RES, automating or reinforcing the DN can be expensive and difficult solutions to implement. The Thesis proposed was that new methods of controlling DG voltage could enable the connection of increased capacities of plant to existing DNs without the need for network management or reinforcement. The work reported here discusses the implications of the increasing capacity of DG in rural distribution networks on steady-state voltage profiles. Two methods of voltage compensation are proposed. The first is a deterministic system that uses a set of rules to intelligently switch between voltage and power factor control modes. This new control algorithm is shown to be able to respond well to slow voltage variations due to load or generation changes. The second method is a fuzzy inference system that adjusts the setpoint of the power factor controller in response to the local voltage. This system can be set to respond to any steady-state voltage variations that will be experienced. Further, control of real power is developed as a supplementary means for voltage regulation in weak rural networks. The algorithms developed in the study are shown to operate with any synchronous or asynchronous generation wherein real and reactive power can be separately controlled. Extensive simulations of typical and real rural systems using synchronous generators (small hydro) and doubly-fed induction generators (wind turbines) have verified that the proposed approaches improve the voltage profile of the distribution network. This demonstrated that the original Thesis was true and that the techniques proposed allow wider operation of greater capacities of DG within the statutory voltage limits.

Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: The world is increasingly being faced with the challenge of effectively exploiting available renewable energy resources, not only to meet an ever growing energy demand, but also to preserve the available amount of fossil fuels and to reduce the amount of carbon dioxide emissions released into the atmosphere by fossil fuelled power stations. Hence, every available renewable energy resource, even small rivers has a contribution to make in the attempt to reduce the amount of fossil fuel generated electricity. The focus of this study is the design and installation of a low cost grid-connected 10 kW micro hydro power system (MHPS). The process to determine the potential of the available water resource is first to be presented. The environmental aspects of these systems, based on the study that is undertaken for the implementation of the landmark example, are discussed. The complete design of a micro hydro power system for a specific site is presented. This design is based on using commercially available components and equipment in an attempt to minimise the total cost of a micro hydro power system. The designed micro hydro power system is installed in-field and the predicted performance of the designed system is verified with measured results of the implemented system. Based on the results of the micro hydro power system landmark example, it is shown through a complete economic study, that this investment is very worthwhile. / AFRIKAANSE OPSOMMING: Die wêreld word daagliks meer en meer uitgedaag om beskikbare alternatiewe energiebronne effektief te benut, nie net om in die groeiende elektrisiteits aanvraag te voorsien nie, maar ook om die beskikbare fossiel brandstowwe te beskerm en ook om die hoeveelheid koolstofdioksied gasse wat deur fossiel brandstof kragstasies vrygestel word, te verminder. Dus het elke beskikbare alternatiewe energiebron, selfs klein riviertjies, ‘n bydrae om te lewer tot die poging om die hoeveelheid elektrisiteit wat deur fossiel brandstowwe opgewek word, te verminder. Die fokus van hierdie studie is op die ontwerp en implementering van ‘n lae koste netwerk gekoppelde 10 kW mikro hidro kragstelsel. Eerstens word die proses om die potensiaal van die beskikbare waterbron te bepaal, bespreek. Al die omgewings aspekte van hierdie mikro hidro kragstelsels word dan bespreek. Dit is ten volle gebaseer op die studies wat gedoen is vir die implementering van hierdie landmerk voorbeeld. Die volledige ontwerp van ‘n mikro hidro kragstelsel, vir ‘n spesifieke terrein, word bespreek. Hierdie ontwerp is hoofsaaklik gebasseer op die gebruik van kommersieel beskikbare komponente met die doel om die totale koste van die stelsel te minimeer. Die stelsel wat ontwerp is, is geïnstalleer op die terrein en die verwagte prestasie van die stelsel is toe geverifieer met gemete resultate van die geïnstalleerde stelsel. ‘n Volledige ekonomiese studie wat gebaseer is op die resultate van die geïnstalleerde stelsel, word dan bespreek en daar is gevind dat hierdie stelsel werklik finansieel die moeite werd is. / Centre for Renewable and Sustainable Energy Studies

Fox Lake Cree Nation (FLCN) is a First Nation community located in northern Manitoba, with approximately 1100 community members, of which approximately 500 reside in the traditional territory. FLCN has been highly affected by the development of five dams within their traditional territory, and have participated in the Clean Environment Commission hearings to share the impacts of that development. The FLCN youth have a unique perspective and experience with development. Youth are impacted by past hydroelectric development projects, and will continue to be affected in the future. In addition to looking at impacts and mitigation strategies, FLCN youth are looking to business and training opportunities that still align with their core values and Cree worldview. Knowledge transmission from Elders to youth is an important factor in moving forward for FLCN youth. Understanding how these experiences and perspectives affect and influence youth in FLCN is important to creating a future that benefits the youth of Fox Lake Cree Nation. / May 2017