ISE - Relatórios técnicos
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- Análise técnica do impacto da mudança de hora legal na penetração da geração de energia renovável não controlável no consumo em Portugal continentalPublication . Silva, João M. Henriques da; Couto, António; Duque, JoaquimRESUMO: A análise técnica do impacto da alteração do regime de hora legal no consumo de energia em Portugal Continental, suprido pela geração de energia renovável não despachável (VRE) e, por isso, não regulável em função do consumo, procurou averiguar a presença de eventuais benefícios que poderiam decorrer dessa alteração. Contudo, neste domínio de análise, não foi detetada a existência de qualquer vantagem significativa decorrente da alteração do regime de hora legal vigente para quaisquer outros regimes de hora legal analisados.
- Aplicações a Engenharia: Algumas aplicações do Software ANSYS FluentPublication . Lima, MargaridaRESUMO: Com uma larga experiência, o Computer Fluid Dynamic (CFD) ANSYS é referência mundial em simulação computacional. As suas ferramentas são usadas por líderes de mercado para transformar a maneira de projetar, permitindo aos engenheiros explorar e prever como os produtos vão funcionar no mundo real. O objetivo é, reduzir custos com protótipos e tempo de produção, melhorar a qualidade, diminuir riscos, acelerando a inovação em todos os setores para ultrapassar os limites previstos nas diferentes áreas do saber. A plataforma de trabalho do ANSYS é atrativa e intuitiva. Nela inicia-se o modelo ou os componentes dos modelos a construir em geral em 2D ou 3D. Tem compatibilidade como CAD e outros programas. No caso da termodinâmica, fluidos sem ou com componentes (thermoclines ) utiliza-se o pacote de Fluids. Com ele resolvem-se as equações de convecção, turbulência e mesmo da radiação nas fronteiras que definem o projeto em causa. Também se analisam as componentes que se podem otimizar em função do estudo pretendido. Os meios porosos estão, pois, largamente incluídos.
- Aumentar os impactos transformadores das inovações sustentáveis: evidência das tecnologias de energia renovável marinhaPublication . Fontes, Margarida; Bento, Nuno; Sousa, Cristina; Barbosa, Juliana; Santos, Hélder; Sá Marques, TeresaRESUMO: Tanto as empresas como os decisores políticos procuram aproveitar as oportunidades para criar atividade e emprego na transição para uma economia de baixo carbono. Os co-benefícios da transição sustentável são cada vez mais investigados pelos ganhos potenciais que proporcionam aos países e pela sua contribuição para a aceitação social da transição sustentável. Em particular, o desenvolvimento e a experimentação de novas tecnologias energéticas deverão criar efeitos de aprendizagem localizados que melhorem os custos e o desempenho dessas tecnologias, permitindo, ao mesmo tempo, que os atores criem capacidade e diversifi quem para novas atividades necessárias à cadeia de valor emergente. Este Policy brief esclarece como a política tecnológica e a estratégia industrial se podem complementar, de modo a criar recursos coletivos para acelerar o progresso de tecnologias emergentes, obtendo vantagens competitivas, e transformando os sectores existentes.
- Building new indicators for researchers’ careers and mobility based on electronic curriculum vitae: the case of the DeGóis platformPublication . Fontes, Margarida; Assis, José; Araújo, Emília; Bento, Sofia; Henriques, Luísa; Pirralha, André; Santos, LeonelThere are currently two main databases in Portugal regarding researchers’ electronic CVs: • the FCT-SIG (Council for Science and Technology-Information and Management System) – hereafter called the FCT Information System, and • the DeGóis Platform Although this report will be concentrated on discussing the DeGóis Platform, since the latter will prevail in the medium/long term, replacing the former one, we believe it is useful to shed some light on the FCT Information System, as it still comprises the bulk of researchers’ electronic CVs in Portugal.
- Characterization of new flexible players: Deliverable D3.2Publication . Chrysanthopoulos, Nikolaos; Papadaskalopoulos, Dimitrios; Strbac, Goran; Schimeczek, Christoph; Kochems, Johannes; Vries, Laurens de; Sanchez, Ingrid; Algarvio, Hugo; Couto, António; Pinto, Tiago; Hernandez-Serna, Ricardo; Johanndeiter, Silke; Estanqueiro, AnaABSTRACT: The subject matter of this report is the analysis of the electricity markets’ actors’ scene, through the identification of actor classes and the characterisation of actors from a behavioural and an operational perspective. The technoeconomic characterization of market participants aims to support the upcoming model enhancements by aligning the agent-based model improvements with the modern market design challenges and the contemporary characteristics of players. This work has been conducted in the context of task T3.2, which focuses on the factorization of the distinctive operational and behavioural characteristics of players in market structures. Traditional parties have been considered together with new and emerging roles, while special focus has been given on new actors related to flexible technologies and demand-side response. Among the main objectives have been the characterization of individual behaviours, objectives and requirements of different electricity market players, considering both the traditional entities and the new distributed ones, and the detailed representation of the new actors.
- Comparative Analysis of Market Designs : Deliverable D5.5Publication . Couto, António; Qiu, Dawei; Sperber, Evelyn; Lezama, Fernando; Strbac, Goran; Syse, Helleik; Algarvio, Hugo; Kochems, Johannes; Wang, Ni; Chrysanthopoulos, Nikolaos; Gregorio, Noelia Martin; Faia, Ricardo; Silke, Johanndeiter
- Computation of Hydrodynamic Coefficients for Submerged Spheres: A Comprehensive AnalysisPublication . Justino, Paulo AlexandreABSTRACT: Hydrodynamic coefficients are essential parameters in fluid mechanics that serve to quantify the complex interaction between a submerged body and the surrounding fluid . Specifically in the context of submerged spheres, these coefficients provide a measure of the forces and moments exerted by the fluid on the sphere, or conversely, the resistance the sphere encounters as it moves through the fluid . Understanding and accurately determining these coefficients is paramount for a wide range of applications, including the design and control of underwater vehicles, the analysis of offshore structures, and the prediction of the behavior of marine organisms. The accurate prediction of wave loads on submerged structures also relies heavily on the evaluation of these coefficients. The significance of hydrodynamic coefficients lies in their ability to simplify the complex physics of fluid-structure interaction into manageable parameters. For instance, the added mass coefficient reflects the inertia of the fluid that is accelerated along with the moving sphere, effectively increasing the sphere's apparent mass. This phenomenon is critical in dynamic analyses, as the inertial forces are directly influenced by this added mass. Similarly, the drag coefficient quantifies the resistance force that opposes the sphere's motion, a force primarily attributed to viscous effects and the pressure distribution around the body. In certain flow regimes, particularly involving non-uniform flow fields such as those induced by waves or in the presence of rotation, a lift coefficient may also become relevant, representing a force acting perpendicular to the direction of motion. The accurate determination of these coefficients, which can be linear or nonlinear depending on the complexity of the fluid-structure interaction, is a crucial step in the design and analysis of any system involving submerged spheres. The interaction between a submerged sphere and the surrounding fluid exemplifies a fundamental fluid-structure interaction problem. When a solid object like a sphere is placed in the path of a fluid, the fluid exerts pressure and viscous forces on the sphere's surface, potentially leading to its motion or deformation. Conversely, the presence and motion of the sphere alter the flow field of the fluid. Hydrodynamic coefficients serve as the critical link in understanding this bidirectional influence, allowing engineers and researchers to predict the dynamic response of the sphere to fluid forces and the impact of the sphere's motion on the fluid environment. For example, in the context of underwater explosions, the structural response of a submerged body significantly affects the dynamics of the explosion bubble, highlighting the intricate nature of fluid-structure interaction where hydrodynamic coefficients play a vital role.
- Design of ancillary service markets and products: Challenges and recommendations for EU renewable power systems: Deliverable D3.3Publication . van der Welle, Adriaan; Morales-España, Germán; Sijm, Jos; Serna, Ricardo Hernandez; Kochems, Johannes; Couto, António; Algarvio, Hugo; Kiviluoma, Juha; Vries, Laurens de; Estanqueiro, AnaABSTRACT: The overall objective of the current study is to analyse the implications of the transition towards a renewable, climate-neutral power system in the EU for the demand and supply of ancillary services (AS) of this system in general and for the market design and related EU regulation of these services in particular. The study focuses predominantly on electricity balancing services (‘frequency control’). However, other ancillary services – not ably reactive power services (‘voltage control’) and system restoration services (‘black start’) – are, to some extent, considered as well. More specifically, the study analyses in particular (i) the current situation (‘base case’) of ancillary (electricity balancing) services in the EU, (ii) the future situation (‘towards a 100% renewable EU power system’) of these services, and (iii) the major challenges and recommendations for the main ancillary services markets in the EU in order to improve the performance of these markets in the coming years, i.e. up to 2030 and beyond.
- Development of DLR analysis and power system models: Deliverable D3.1Publication . Algarvio, Hugo; Duque, Joaquim; Couto, AntónioABSTRACT: This deliverable presents the work developed by LNEG as part of the R&D activities of the project OPTIGRID - Methodology for the dynamic line rating analysis and optimal management of power networks. According to the plan activities of Tasks 3.1 and 3.2, the main objective of this deliverable is to integrate the mathematical model for the Dynamic Line Rating (DLR) analysis in the optimal power flow model for a generic AC power system, previously developed in LNEG. The main limiting factor for the transmission capacity of overhead lines (OHLs) is usually defined by a thermal constraint. For OHLs several effects are present, some with a positive contribution while others can lead to the potential congestion of the electrical networks. The seasonal line rating (SLR) methodology, traditionally used by the system operators to ensure that the grid does not operate over the maximum pre defined conductor temperature, determines the line’s ampacity from constant weather conditions using: 1) seasonal basis information or 2) conservative weather conditions. These conditions usually underestimate the real transmission capacity of OHLs. Thus DLR analysis allows assessing more realistic current limits for the power lines could present a method to deal with potentially congested electrical networks enabling the optimal integration of distributed renewable power generation.
- Differential Equations and Courant Number: A short studyPublication . Lima, MargaridaABSTRACT: The considerations presented in this report result from the analysis performed in the context of the project NewSol. Even if it is not pertinent to the development of the work, they were needed to obtain a correct modelling. While modeling is being done, a theoretical support was carried on. To give support to the chosen method, or going in some direction, several methods were presented for comparison.