Encontrados 20 documentos, a visualizar página 1 de 2
Monitoring efficiency and productivity of promoters in wind energy sector
Vaz, Clara B.; Ferreira, Ângela P.A DEA framework is proposed to explore the differences in performance of a set of wind farms, which involves two main promoters in the Portuguese wind energy sector. The study investigates the efficiency of the promoters in maximizing the energy produced from the physical resources and the wind velocity available in each farm. The overall performance of the two promoters is analyzed by comparing their differenc...
Framework for performance assessment of wind farms
Vaz, Clara B.; Ferreira, Ângela P.This study develops a framework to provide insights regarding the performance of the farms of an energy player in the Portuguese wind sector. Firstly, the Data Envelopment Analysis is used to measure the efficiency of wind farms in producing electrical energy from the resources available and exogenous variables, during operating stage. This analysis enables the identification of the best practices of the effici...
Monitorização do desempenho de operadores de parques eólicos portugueses
Araújo, Elisabete; Vaz, Clara B.; Ferreira, Ângela P.Neste estudo utilizam-se modelos de DEA para avaliar o desempenho dos parques eólicos pertencentes a dois operadores presentes no setor energético Português de forma a apoiar o benchmarking e a melhoria das práticas durante a operação dos parques. Pretende-se comparar o desempenho dos dois operadores em termos da capacidade dos parques maximizarem a produção de energia a partir dos recursos disponíveis e do pot...
Monitoring performance of hydroelectric power plants
Vaz, Clara B.; Ferreira, Ângela P.This study develops a methodology to provide insights regarding the efficiency and productivity of the hydroelectric power plants of an European player in the energy sector throughout the operation stage. DEA is used to measure the efficiency of utilities in generating electrical energy from the resources available and exogenous variables. This analysis enables the identification of the best practices of power ...
Framework for performance assessment of wind farms
Vaz, Clara B.; Ferreira, Ângela P.This study develops a framework to provide insights regarding the performance of the farms of an energy player in the Portuguese wind sector. Firstly, the Data Envelopment Analysis is used to measure the efficiency of wind farms in producing electrical energy from the resources available and exogenous variables, during operating stage. This analysis enables the identification of the best practices of the effici...
Wind farms model aggregation using probabilistic clustering
Fernandes, Paula O.; Ferreira, Ângela P.The main objective of this research is the identification of homogeneous groups within wind farms of a major operator playing in the energy sector in Portugal, based on two multivariate analyses: Hierarchical Cluster Analysis and Discriminant Analysis, by using two independent variables: annual liquid hours and net production. From the produced outputs there were identified three homogenous groups of wind farms...
On the implementation of a microgrid project with renewable distributed generation
Leite, V.; Ferreira, Ângela P.; Batista, J.This paper describes the on-going implementation of a microgrid project with renewable distributed generation under the context of an initiative with demonstration purposes in an university campus. In the actual context of the electrical energy demand increase and limited conventional resources, along with the consciousness of the climate changes and the need to invest in clean energies, microgrids allows the i...
Performance assessment of hydroelectric power plants
Vaz, Clara B.; Ferreira, Ângela P.This study develops a methodology to provide insights regarding the performance of the hydroelectric power plants of a European player in the energy sector. In today’s energy generation programs, hydroelectric power plays an important role as it is based on a clean renewable energy source and capable of fulfilling a significant portion of the overall power demand. Hydroelectric power plants may use the natural ...
Dealing with the very small: first steps of a picohydro demonstration project i...
Leite, V.; Figueiredo, Tomás de; Pinheiro, Tiago; Ferreira, Ângela P.; Batista, JoséThis paper presents the implementation, project and design of a small run-of-river hydropower plant, designed for demonstration purposes, under a Project aimed to be a framework of wide spread dissemination of renewable energies and energy efficiency in an University Campus. The details of the hydroelectric power plant, from the project design until the final use of the produced electric energy, are described. ...
Thermal analysis of an axial flux permanent magnet machine
Ferreira, Ângela P.; Costa, A.F.Analytical lumped parameter circuits based on thermal resistances have been used extensively for calculation of the temperature rise in electrical machines. This work presents an analytical thermal equivalent circuit of an Axial Flux Permanent Magnet (AFPM) machine for steady state condition, used recursively with the electromagnetic design. From their interaction, the electrical loading has been adjusted, resu...
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