Graduation theses deal with grants on renewable energy sources. Equate to possibilities supports renewable energy sources and smoothing - out whether be necessary further promotion above law 180/2005 Sb. Lockwork work smoothing - out this question for instance 3 kinds renewable energy sources, behind using two economic criteria namely net present value and internal rate of return.

Diploma thesis deals with analysis of energy resources. The aim is to map the potential of renewable resources in the Czech Republic and through multicriteria decision making to assess the potential investment options in renewable energy in the Czech Republic.

My thesis is focused on Project Financing of Investment Projects in the field of Renewable Energy Resources. The theoretical section, see Chapter Two, characterises the nature of project financing, parties, principles for successful project financing, types of capital invested in projects and their resources, risks, guarantees and securities. The practical (third) part of the thesis is oriented to specifics of project financing of Renewable Energy Resources. First of all principles for the assessment both of project bearers and projects in terms of quality are specified. Furthermore, principals for the assessment of financial terms of projects are given. The fourth and concurrently the final Chapter analyses a particular project in the field of renewable energy resources mostly from the financial point of view.

Renewable energy resources, especially photovoltaics, have experienced enormous boom all over the world in the past few years. It was completely the same in Czech Republic where you would not find anybody without his own opinion regarding PV business. Installation of PV power plants has become very attractive business, with very significant role in 2011 in Czech Republic. At this time, this solar boom has found its "home" in other European countries, particularly in Eastern Europe. The post of the new Eastern Europe's "powerhouse" can defend even Romania, that's the cause I have chosen this country as the subject of this thesis. The aim of this thesis is to create a business plan for PV power plant and evaluate the investment opportunity of its installation in Romania. And then by means of a sensitivity analysis find out the impact of external factors that can significantly affect the profitability of the project.

The use of renewable energy has proven to be essential for the decarbonisation of the energy system, bringing changes on both the production and consumption side, with an increase of renewable energy in the mix and a change in the role of consumers. From passive actors, Consumers are becoming Prosumers (producers and consumers) of self-generated energy, with the potential of becoming the pillar of the energy sector transition. The European Union set ambitious goals for the realization of a low carbon society by 2050, giving birth to several energy related initiatives. From a regulatory perspective, Europe is indeed paving the way for an internal energy market revolution, that sees the introduction of new actors among which, Local Energy Communities (LEC). In the progressive transition from a centralized to a decentralized system with intelligent and interconnected production sources, consumers are allowed to produce, store, share or resell their energy directly or as energy cooperatives, and can manage demand either independently or through aggregators. In this context Energy Communities take shape. In accordance with the definition given in the European RED directive "Renewable Energy Directive", this study refers to energy communities as a set of energy users who, through cooperatives, non-profit associations, or other legal forms, make common decisions for the satisfaction of their energy needs, with the aim of providing environmental, social and economic benefits. The overall objective of the study is to gain a better understanding of the environmental, grid and social impacts of local energy communities, as well as of the factors that can potentially enable or inhibit the deployment of such communities. The emergence of prosumers and energy communities raise new challenges in terms of technologies and technical requirements for the interaction with the electricity grid, in terms of the need for new business models and new energy policies and regulatory framework, to encourage these new configurations and unlock their benefits as effectively as possible. In the context of this work, a model for the assessment of LECs viability has been built; it examines the consumption and renewable generation loads, with the possibility to measure the effects of adding a battery storage system in the community configuration. The profitability of residential customers participating in a LEC is investigated for four different technological community scenario: (i) solely stand-alone PV plant (ii) stand-alone PV plant with the addition of a solar battery for self-consumption maximization (iii) stand-alone PV plant with the addition of a battery storage system for Demand Side Management behind-the-meter and (iv) stand-alone PV plant with the addition of a battery storage system for Demand Side Management front-of-the-meter. The economic impact of storage on LEC energy usage has been studied while considering the technical aspects of the proposed system. The simulation analysis – based on real residential demand profiles, renewable generation curves, battery energy storage functioning, market pricing and incentives scheme, showed that energy sharing and collective investment in residential scale renewable assets and batteries can be economically feasible, but the economics can significantly fluctuate with changes in parameters such as technology cost, LECs incentives, electricity prices, and that therefore the convenience of one scenario over the others should be verified each time the conditions change. Also, the type of services for which the battery can get revenues may disrupt the conclusions reached. The aim of the work, however, was to build a model easily adaptable to the variation of these parameters, in order to calculate case by case economics and convenience of any possible community configuration. / Användningen av förnybar energi har visat sig vara avgörande för att minska koldioxidutsläppen från energisystemet, vilket medför förändringar både på produktions- och konsumtionssidan, med en ökad andel förnybar energi i mixen och en förändrad roll för konsumenterna. Från att ha varit passiva aktörer blir konsumenterna nu Prosumers, producenter och konsumenter av egenproducerad energi, med potential att bli en pelare i övergången inom energisektorn. Europeiska unionen har satt upp ambitiösa mål om att förverkliga ett samhälle med låga koldioxidutsläpp senast 2050, vilket har gett upphov till flera energirelaterade initiativ. Ur ett regleringsperspektiv banar Europa verkligen väg för en revolution på den inre energimarknaden, där nya aktörer kommer att introduceras, bland annat lokala energikommuner. I den gradvisa övergången från ett centraliserat till ett decentraliserat system med intelligenta och sammankopplade produktionskällor får konsumenterna producera, lagra, dela eller sälja sin energi direkt eller som energikooperativ, och de kan hantera efterfrågan antingen självständigt eller genom aggregatorer. I detta sammanhang tar energisamhällen form. I enlighet med definitionen i det europeiska direktivet om förnybar energi i den här studien avses med energisamhällen en grupp energianvändare som genom kooperativ, ideella föreningar eller andra juridiska former fattar gemensamma beslut för att tillgodose sina energibehov, i syfte att skapa miljömässiga, sociala och ekonomiska fördelar. Det övergripande målet med studien är att få en bättre förståelse för de miljömässiga, nätmässiga och sociala konsekvenserna av lokala energisamhällen, samt för de faktorer som kan möjliggöra eller hindra införandet av sådana samhällen. Framväxten av prosumenter och energisamhällen ger upphov till nya utmaningar när det gäller teknik och tekniska krav för samverkan med elnätet, när det gäller behovet av nya affärsmodeller och ny energipolitik och regelverk för att uppmuntra dessa nya konfigurationer och frigöra deras fördelar på ett så effektivt sätt som möjligt. Inom ramen för detta arbete har en modell för bedömning av LECs lönsamhet byggts upp. Den undersöker förbrukning och belastning från förnybar produktion, med möjlighet att mäta effekterna av att lägga till ett batterilagringssystem i samhällskonfigurationen. Lönsamheten för privatkunders deltagande i ett LEC undersöks för fyra olika tekniska samhällsscenarier: (i) enbart fristående solcellsanläggning, (ii) fristående solcellsanläggning med tillägg av ett solcellsbatteri för maximering av självförbrukningen, (iii) fristående solcellsanläggning med tillägg av ett batterilagringssystem för styrning av efterfrågan bakom mätaren och (iv) fristående solcellsanläggning med tillägg av ett batterilagringssystem för styrning av efterfrågan framför mätaren. Lagringens ekonomiska inverkan på LECs energianvändning har studerats samtidigt som de tekniska aspekterna av det föreslagna systemet har beaktats. Simuleringsanalysen - som i skrivande stund bygger på verkliga efterfrågeprofiler för bostäder, kurvor för förnybar produktion, batterilagringens funktion, marknadens prissättning och incitamentssystem - visade att energidelning och kollektiva investeringar i förnybara tillgångar och batterier i bostadsområden kan vara ekonomiskt genomförbara, men att ekonomin kan fluktuera avsevärt med förändringar i parametrar som teknikkostnader, incitament för LEC:s och elpriser, och att det därför är lämpligt att kontrollera om det är fördelaktigt att välja ett scenario framför de andra varje gång förhållandena förändras. Även den typ av tjänster som batteriet kan få intäkter för kan påverka de slutsatser som dras. Syftet med arbetet var dock att bygga en modell som lätt kan anpassas till variationen av dessa parametrar, för att från fall till fall beräkna ekonomin och bekvämligheten hos alla möjliga konfigurationer av samhället.

O objetivo da dissertação foi o desenvolvimento de um modelo de avaliação rápida da atratividade de oportunidades de negócios em recursos energéticos renováveis dentro de uma região geográfica delimitada, valendo-se dos resultados do Planejamento Integrado de Recursos Energéticos (PIR) para a região analisada, complementado com outras bases bibliográficas primárias e secundárias. O uso dos resultados do PIR propiciou o acesso rápido a avaliações prontas dos recursos energéticos em três dimensões1, além da dimensão técnico-econômica, incluindo opiniões e posições da sociedade local e nacional (técnicos e não técnicos). No estudo piloto, o modelo é aplicado em cinco recursos energéticos renováveis dentro da Região Administrativa de Araçatuba (RAA), noroeste do estado de São Paulo. Os recursos avaliados são: (a) de oferta: Geração eólica (EOL); Cogeração por Biomassa de Cana-de-açúcar (BIO); e Pequenas Centrais Hidroelétricas (PCH); (b) de demanda (medidas de economia): Troca de Lâmpadas Incandescentes por Fluorescentes Compactas e Troca de Chuveiros Elétricos por Aquecedores Solares. Os principais resultados do modelo de avaliação foram (i) um modelo de fluxo de caixa funcional para a avaliação dos recursos de geração; (ii) para cada recurso de geração: cálculo das principais Figuras de Mérito Econômico Financeiro (VPL, TIR, PayBack Descontado, preço de equilíbrio2 da energia gerada e demanda relevante de capital de giro); (iii) para as medidas de economia de energia: cálculo das figuras de mérito econômico-financeiras (Custo do Ciclo de vida anualizado (CCVA) e PayBack Descontado); (iv) pontos notáveis da análise de sensibilidade das figuras de mérito, obtidas pela variação das principais parâmetros de entrada dos modelos matemáticos representativos dos recursos; (v) análise geral dos riscos em empreender os recursos avaliados; e (vi) diagnóstico da atratividade de investimento em cada recurso: não atrativo, atrativo com atenção, e atrativo. No contexto do estudo piloto, o recurso lâmpada fluorescente recebeu diagnóstico de atrativo; os recursos Cogeração por biomassa e coletor solar receberam o diagnóstico de atrativo com atenção, e os recursos Geração eólica e PCH receberam o diagnóstico de não atrativos para investimento, todos dentro da região do estudo de caso. / The purpose of this work was the expedite assessment of business opportunities attractiveness in renewable energy resources within a limited geographical area, based on the results of the Integrated Resources Planning for Energy (IRP), developed for the same area, and supplemented with other primary and secondary information sources. The use of IRP\'s information made possible, quickly and easy, the assessments of energy resources in extra three dimensions3, beyond the usual technical- economic one, including views and positions of local and national stakeholders (technical and nontechnical). In the pilot study, the model is applied in five renewable energy resources within the Administrative Region of Araçatuba (RAA), northwest of São Paulo state, Brazil. The evaluated energy resources were: (a) supply side: wind generation (EOL); Cogeneration by Biomass of Sugar Cane (BIO); and Small Hydro Power plants (SHP); (b) demand side (measures of energy economy): replacement of Compact Fluorescent Incandescent bulbs by Fluorescent ones and replacement of Electric Showers by Solar Heater ones. The main results of the proposed evaluation model were (i) a functional cash flow model , useful to assess the generation resources; (ii) for each generation resource: the calculation of the main Figures of Economic Merit (NPV, IRR, Discounted Payback, the equilibrium price of generated energy and relevant demand for working capital), (iii) measures of energy economy: the calculation of the main Figures of Economic Merit (Annualized Life Cycle Cost (ALCC) and Payback Discounted (PBD), (iv) points of remarkable sensitivity in the Figures of Economic Merit analysis, obtained by varying the main independent parameters input in the cash flow models that represent the resources, (v) analysis of the risks in adoption of the evaluated resources, and finally, (vi) the attractiveness degree of each resources evaluated : not attractive, attractive with attention, and attractive. Within the context of the pilot study case, the use of compact fluorescent bulb received the degree attractive; biomass cogeneration (BIO) and solar collector received degree attractive, but under attention; wind generation (EOL) and PCH received the degree not attractive for investment within the study case region.

O objetivo da dissertação foi o desenvolvimento de um modelo de avaliação rápida da atratividade de oportunidades de negócios em recursos energéticos renováveis dentro de uma região geográfica delimitada, valendo-se dos resultados do Planejamento Integrado de Recursos Energéticos (PIR) para a região analisada, complementado com outras bases bibliográficas primárias e secundárias. O uso dos resultados do PIR propiciou o acesso rápido a avaliações prontas dos recursos energéticos em três dimensões1, além da dimensão técnico-econômica, incluindo opiniões e posições da sociedade local e nacional (técnicos e não técnicos). No estudo piloto, o modelo é aplicado em cinco recursos energéticos renováveis dentro da Região Administrativa de Araçatuba (RAA), noroeste do estado de São Paulo. Os recursos avaliados são: (a) de oferta: Geração eólica (EOL); Cogeração por Biomassa de Cana-de-açúcar (BIO); e Pequenas Centrais Hidroelétricas (PCH); (b) de demanda (medidas de economia): Troca de Lâmpadas Incandescentes por Fluorescentes Compactas e Troca de Chuveiros Elétricos por Aquecedores Solares. Os principais resultados do modelo de avaliação foram (i) um modelo de fluxo de caixa funcional para a avaliação dos recursos de geração; (ii) para cada recurso de geração: cálculo das principais Figuras de Mérito Econômico Financeiro (VPL, TIR, PayBack Descontado, preço de equilíbrio2 da energia gerada e demanda relevante de capital de giro); (iii) para as medidas de economia de energia: cálculo das figuras de mérito econômico-financeiras (Custo do Ciclo de vida anualizado (CCVA) e PayBack Descontado); (iv) pontos notáveis da análise de sensibilidade das figuras de mérito, obtidas pela variação das principais parâmetros de entrada dos modelos matemáticos representativos dos recursos; (v) análise geral dos riscos em empreender os recursos avaliados; e (vi) diagnóstico da atratividade de investimento em cada recurso: não atrativo, atrativo com atenção, e atrativo. No contexto do estudo piloto, o recurso lâmpada fluorescente recebeu diagnóstico de atrativo; os recursos Cogeração por biomassa e coletor solar receberam o diagnóstico de atrativo com atenção, e os recursos Geração eólica e PCH receberam o diagnóstico de não atrativos para investimento, todos dentro da região do estudo de caso. / The purpose of this work was the expedite assessment of business opportunities attractiveness in renewable energy resources within a limited geographical area, based on the results of the Integrated Resources Planning for Energy (IRP), developed for the same area, and supplemented with other primary and secondary information sources. The use of IRP\'s information made possible, quickly and easy, the assessments of energy resources in extra three dimensions3, beyond the usual technical- economic one, including views and positions of local and national stakeholders (technical and nontechnical). In the pilot study, the model is applied in five renewable energy resources within the Administrative Region of Araçatuba (RAA), northwest of São Paulo state, Brazil. The evaluated energy resources were: (a) supply side: wind generation (EOL); Cogeneration by Biomass of Sugar Cane (BIO); and Small Hydro Power plants (SHP); (b) demand side (measures of energy economy): replacement of Compact Fluorescent Incandescent bulbs by Fluorescent ones and replacement of Electric Showers by Solar Heater ones. The main results of the proposed evaluation model were (i) a functional cash flow model , useful to assess the generation resources; (ii) for each generation resource: the calculation of the main Figures of Economic Merit (NPV, IRR, Discounted Payback, the equilibrium price of generated energy and relevant demand for working capital), (iii) measures of energy economy: the calculation of the main Figures of Economic Merit (Annualized Life Cycle Cost (ALCC) and Payback Discounted (PBD), (iv) points of remarkable sensitivity in the Figures of Economic Merit analysis, obtained by varying the main independent parameters input in the cash flow models that represent the resources, (v) analysis of the risks in adoption of the evaluated resources, and finally, (vi) the attractiveness degree of each resources evaluated : not attractive, attractive with attention, and attractive. Within the context of the pilot study case, the use of compact fluorescent bulb received the degree attractive; biomass cogeneration (BIO) and solar collector received degree attractive, but under attention; wind generation (EOL) and PCH received the degree not attractive for investment within the study case region.

Electrical energy is one of the most common forms of energy these days. Consequently, electric power system is an indispensable part of any society. However, due to the deregulation of electricity markets and the growth in the share of power generation by uncontrollable renewable energies such as wind and solar, power system simulations are more challenging than earlier. Thus, new techniques for simplifying these simulations are needed. One important example of such simplification techniques is the power system reduction. Power system reduction can be used at least for four different purposes: a) Simplifying the power system simulations, b) Reducing the computational complexity, c) Compensating the data unavailability, and d) Reducing the existing uncertainty. Due to such reasons, power system reduction is an important and necessary subject, but a challenging task to do. Power system reduction is even more essential when system operators are facing very large-scale power systems and when the renewable energy resources like hydro, wind, and solar have a high share in power generation. This thesis focuses on the topic of large-scale power system reduction with high penetration of renewable energy resources and tries to pursue the following goals: • The thesis first reviews the different methods which can be used for simplifying the power system studies, including the power system reduction. A comparison among three important simplification techniques is also performed to reveal which simplification results in less error and more simulation time decrement. • Secondly, different steps and methods for power system reduction, including network aggregation and generation aggregation, are introduced, described and discussed. • Some improvements regarding the subject of power system reduction, i.e. on both network aggregation and generation aggregation, are developed. • Finally, power system reduction is applied to some power system problems and the results of these applications are evaluated. A general conclusion is that using power system simplification techniques and specially the system reduction can provides many important advantages in studying large-scale power systems with high share of renewable energy generations. In most of applications, not only the power system reduction highly reduces the complexity of the power system study under consideration, but it also results in small errors. Therefore, it can be used as an efficient method for dealing with current bulk power systems with huge amounts of renewable and distributed generations. / <p>The Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively. QC 20150116</p>

Operation of the electricity markets is subject to a number of strict and specific constraints such as continuous load-generation balance, security of supply, and generation technology related limitations. Contributions have been made to two important problems of the Electricity Markets, in the context of this study. In this study, Price Based Unit Commitment problem in the literature, which is a tool for the GENCO for operations planning, is extended considering the interdependencies between the Natural Gas (NG) and Electricity infrastructures and the uncertainty of Wind Power generation. The effect of the NG infrastructure physical limitations is considered via linearized NG transmission system equations, and the Wind energy sources and conventional generation resource uncertainties are simulated by Monte-Carlo simulations. The contribution of the forward energy Bilateral Contracts (BC), as a financial risk hedging tool is also included by modeling these in the proposed PBUC framework. In the case studies , it is observed that a GENCO could prevent its financial losses due to NG interruptions, by depositing only a portion of the midterm interrupted NG in the storage facilities. The Security Constrained Unit Commitment (SCUC) Problem is widely accepted tool in the industry which models the market clearing process. This study integrates two novelties to the SCUC problem / &bull / A discrete demand response model to consider active participation of the consumers, &bull / A hybrid deterministic/stochastic contingency model to represent the N-1 contingencies together with the uncertainties related with the wind power generation and system load. It is observed that the curtailment of available wind power capacity would enable the TSO to take corrective actions against occurrence of the contingencies and realization of the uncertainties in the most possible economical manner.

This thesis deals with the issue of power flow analysis in a medium voltage (22kV) distribution network with a focus on the influence of distributed energy generation recources. At first the issue of operation of distributed energy resources and their reverse effects on the distribution system is presented in the thesis. Furtherly there are described their operational conditions from the legislation point of view. The part dealing with calculation compares two network configurations in terms of power quality and how the power quality is impacted by distributed energy resources. The attention is given to voltage conditions, short-circuit power, power conditions, losses and flicker. The first configuration corresponds to the real situation in the network, the other one is describing the changes after the new 110/22 kV substation implementation to the power supply area and the overal change of network configuration. The network model and run simulation is done using the E-Vlivy program.