2018
Autores
Mehrasa, M; Sepehr, A; Pouresmaeil, E; Kyyra, J; Marzband, M; Catalao, JPS;
Publicação
2018 INTERNATIONAL CONFERENCE ON SMART ENERGY SYSTEMS AND TECHNOLOGIES (SEST)
Abstract
A synchronous generator (SG)-based control technique is proposed in this paper to force the grid voltage magnitude and frequency to follow the desired values under high penetration of renewable energy sources. A more detailed relationship between power dynamic model and SGs characteristics has been considered in the proposed control strategy. The active and reactive power error-based curve of the proposed control technique is evaluated in detail. Besides, the grid angular frequency error based on the proposed control technique performance is assessed in the next step. Simulation is employed in Matlab/Simulink to verify the operation of the proposed control technique in power converters for large-scale integration of renewable energy sources into the power grids.
2018
Autores
Ruiz Armenteros, AM; Delgado, JM; Lamas Fernandez, F; Bravo Pareja, R; Lazecky, M; Bakon, M; Sousa, JJ; Caro Cuenca, M; Verstraeten, G; Hanssen, RF;
Publicação
IGARSS 2018 - 2018 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM
Abstract
The Aswan High Dam, Egypt, was built in the 1960s and is one of the biggest dams in the world. It stopped the seasonal flood of Nile river allowing the urban expansion of cities/villages and the full year cultivation, producing 10x10(9) kWh of power annually. The dam is located in an area where several earthquakes (M-L<6) occurred from 1981 to 2007. In this paper, we want to identify any potential damage that could be caused to the dam, and assess its overall structural stability using Multi-Temporal InSAR (MT-InSAR). To reach this goal, we process Envisat data from descending orbits acquired between 2003 and 2010. Our initial estimates show relatively small rates (maximum around -3 mm/yr in the satellite Line-Of-Sight) of subsidence, whose implications must be further investigated. In addition, we perform a preliminary stress-strain analysis of the dam using FEL and FEM methods to assess if the detected movements correspond to the expected vertical behavior for such mega-structure.
2018
Autores
Baltazar, S; Amaral, A; Barreto, L;
Publicação
4TH INTERNATIONAL CONFERENCE ON PRODUCTION ECONOMICS AND PROJECT EVALUATION (ICOPEV 2018)
Abstract
In this paper, we studied 2017' indexes related to people life conditions: happiness, prosperity, sustainable mobility, quality of life. Some quality of life sub-indexes, regarding mobility, traffic commute time and the pollution, were also considered. A two variable representation was displayed through a simple regression, in order to measure the strength level of the relations between the variables and their influence towards the adoption of sustainable mobility practices. It was possible to conclude that the strongest correlations found were between the happiness and the prosperity indexes; the traffic commute time and the quality of life indexes, by cities; and the pollution and the quality of life indexes, by cities, which aim to explain sustainable mobility behaviors and its impact in the improvement of the population well-being and satisfaction. The information compiled in this study might be relevant to a large group of stakeholders and decision-makers, focused on the definition of policies to increase the citizens' quality of life. This study might be, also useful for increasing the degree of awareness and involvement of the population through the adoption of mobility solutions that will be critical to creating a sustainable way of life in the future.
2018
Autores
Kotsakis E.; Lucas A.; Andreadou N.; Fulli G.; Masera M.;
Publicação
2018 110th AEIT International Annual Conference, AEIT 2018
Abstract
This paper presents recent research conducted at the JRC Smart Grid Interoperability Lab and analyses key parameters that should be taken into consideration for the development of interoperable and sustainable electricity systems. Increasing energy efficiency aims at reducing the overall energy consumption and consequently lower the stress on the environment by using less energy. The first research activity illustrated is on the use of Advanced Metering Infrastructure as a gateway to improve Demand Response/Demand Side Management. The second one focuses on the use of photovoltaic in a low voltage distribution network and studies the effect of penetration in voltage unbalances. The last one addresses the power quality performance of electric vehicle chargers under low temperature conditions and provides hints for improvements. The paper underlines several factors that could affect the efficiency of systems towards making improvements that increase the stability of the relevant operations.
2018
Autores
Kays, E; Karim, A; Varela, L; Putnik, G; Avila, P;
Publicação
11TH CIRP CONFERENCE ON INTELLIGENT COMPUTATION IN MANUFACTURING ENGINEERING
Abstract
In the current competitive and globalized manufacturing scenario Distributed Manufacturing Environments are increasing, and it turns mandatory to explore improved operational approaches. For enhanced simultaneous balancing and scheduling jobs in a Distributed Manufacturing Environment (DME) a mathematical model of Ranked Sequence Positional Weight (RSPW) is proposed. The model capabilities are analysed through a test problem and the results have demonstrated that the proposed RSPW heuristics mathematical model do perform better than other competitive approaches. (C) 2017 The Authors. Published by Elsevier B.V.
2018
Autores
Jozi, A; Pinto, T; Praca, I; Vale, Z;
Publicação
2018 IEEE SYMPOSIUM SERIES ON COMPUTATIONAL INTELLIGENCE (IEEE SSCI)
Abstract
This paper presents a Support Vector Machine (SVM) based approach for energy consumption forecasting. The proposed approach includes the combination of both the historic log of past consumption data and the history of contextual information. By combining variables that influence the electrical energy consumption, such as the temperature, luminosity, seasonality, with the log of consumption data, it is possible for the proposed method by find patterns and correlations between the different sources of data and therefore improves the forecasting performance. A case study based on real data from a pilot microgrid located at the GECAD campus in the Polytechnic of Porto is presented. Data from the pilot buildings are used, and the results are compared to those achieved by several states of the art forecasting approaches. Results show that the proposed method can reach lower forecasting errors than the other considered methods.
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