Percorrer por autor "Tavares, Inês Vieira"
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- Case study of an energy-intensive consumerPublication . Tavares, Inês VieiraThe energy sector is one of the pillars of growth and development for industries and it has been increasing in the last decades. Due to the need of rationalizing energy in industries, the concept of energy efficiency arises. For a rational use of energy, it was created strategies and measures to reduce energy consumptions in a sustainable way – social, economic and environmental. To analyze these consumptions, this paper contains a case study of an energy intensive industrial installation. This study consists of analyzing all the energy consumptions of the installation, through the obtained values of energy indicators.
- Energy resource management in smart buildings considering photovoltaic uncertaintyPublication . Tavares, Inês Vieira; Ramos, Sérgio Filipe CarvalhoO aumento do consumo energético em edifícios residenciais tem levado a um maior foco nos métodos de eficiência energética. Deste modo, surge um sistema de gestão de energia residencial que poderá permitir controlar os recursos energéticos em pequena escala dos edifícios, levando a uma diminuição significativa dos custos energéticos através de um escalonamento eficiente. No entanto, a natureza intermitente das fontes de energia renováveis resulta num problema complexo. Para resolver este desafio, esta tese propõe um escalonamento energético baseado na otimização robusta, considerando a incerteza relacionada com a produção fotovoltaica. A otimização robusta é um método emergente e eficaz para lidar com a incerteza e apresenta soluções ótimas considerando o pior cenário da incerteza, ou seja, encontra a melhor solução entre todos os piores cenários possíveis. Um problema de Programação Linear Binária é inicialmente formulado para minimizar os custos do escalonamento energético. De seguida, o objetivo desta tese é transformar o modelo determinístico num problema robusto equivalente para proporcionar-lhe imunidade contra a incerteza associada à produção fotovoltaica. O modelo determinístico é, assim, transformado num modelo do pior cenário possível. Para validar a eficiência e a eficácia do modelo, a metodologia proposta foi implementada em dois cenários sendo cada um deles constituído por três casos de estudo de escalonamento de energia, para um horizonte de escalonamento a curto prazo. Os resultados da simulação demonstram que a abordagem robusta consegue, efetivamente, minimizar os custos totais de eletricidade do edifício, mitigando, simultaneamente, os obstáculos referentes à incerteza relacionada com a produção fotovoltaica. É também demonstrado que a estratégia desenvolvida permite o ajustamento do escalonamento dos recursos energéticos do edifício de acordo com o nível de robustez selecionado.
- A review on aggregation approaches of distributed energy resourcesPublication . Tavares, Inês VieiraWith the increasing penetration of distributed energy resources (DER) into the grid, the power system has suffered some changes to become more sustainable, flexible, and cost-effective. For this reason, a need for new ways of operating the power system is emerging. The control of DER such as PV power, controllable load, demand response (DR) programs, energy storage units, and electric vehicles will facilitate their integration by balancing operations in the electricity grid. The increase of DER is stressing the distributed nature of power systems, in terms of equipment and in terms of management and control. So, new entities such as aggregators are acting as mediators between end- users and grid operators to facilitate the management and control of the power system. This paper makes a review of different aggregation approaches that can be applied for the integration of the DER in the electric power system, based on recent literature. It focuses on the role of DR aggregators, load aggregators, and energy storage aggregators, and the concepts related to each of these topics are covered.
- A review on aggregation approaches of distributed energy resourcesPublication . Tavares, Inês VieiraWith the increasing penetration of distributed energy resources (DER) into the grid, the power system has suffered some changes to become more sustainable, flexible, and cost-effective. For this reason, a need for new ways of operating the power system is emerging. The control of DER such as PV power, controllable load, demand response (DR) programs, energy storage units, and electric vehicles will facilitate their integration by balancing operations in the electricity grid. The increase of DER is stressing the distributed nature of power systems, in terms of equipment and in terms of management and control. So, new entities such as aggregators are acting as mediators between endusers and grid operators to facilitate the management and control of the power system. This paper makes a review of different aggregation approaches that can be applied for the integration of the DER in the electric power system, based on recent literature. It focuses on the role of DR aggregators, load aggregators, and energy storage aggregators, and the concepts related to each of these topics are covered.