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Publications

Publications by CPES

2009

From da to smartgrids - evolution or revolution? a path to improve the utility efficiency

Authors
Blanquet, A; Santos, J; Carrapatoso, A; Teixeira, C; Madureira, A; Alves, F;

Publication
IET Conference Publications

Abstract
According to the conclusions of the study "Smart Portugal 2020", the Information and Communication Technologies (ICT) can contribute to a reduction of 15% in our ecological footprint. The role of innovation and the early adoption of solutions that could reduce consumption in all economical sectors will be vital to the 20/20/20 European Strategy [1]. Active network management for generation, storage and demand is one of the basis for the SmartGrid concept, where the actions of all agents connected to the electricity system (generators, consumers and Prosumers) can be intelligently integrated aiming for a sustainable, efficient and secure energy supply system [2]. The implementation of this type of system requires an intelligent control and a management system based on advanced communication and monitoring solutions, as well as on self-healing and pre-fault detection technologies. SmartGrids are, therefore, the most efficient approach to integrate Distributed Generation (DG) and renewable energy sources in a coordinated way with demand management in a sustainable system. This paper describes EDP approach to the EnergyCom infrastructure, with improvement of Quality of Service (QoS) and operational efficiency as main target, and presents the importance of SmartGrids as an answer to the challenges of the Electric Energy Distribution, and its role in the corporate strategy. The 3-phase implementation program of the 3rd generation electric grid in EDP Distribuição is also presented.

2008

LOAD CURVE ESTIMATION FOR DISTRIBUTION SYSTEMS USING ANN

Authors
Fidalgo, JN;

Publication
PROCEEDINGS OF THE 7TH WSEAS INTERNATIONAL CONFERENCE ON COMPUTATIONAL INTELLIGENCE, MAN-MACHINE SYSTEMS AND CYBERNETICS (CIMMACS '08)

Abstract
Loads estimation is becoming each time more fundamental for an efficient management and planning of electric distribution systems. Among the factors that contribute to this need of more efficiency are the increasing complexity of these networks, the deregulation process and the competition in an open energy market, and environment preservation requirements. However, the only information generally available at MV and LV levels is essentially of commercial nature, i.e., monthly energy consumption, hired power contracts and activity codes. In consequence, distribution utilities face the problem of estimating load diagrams to be used in planning and operation studies. The typical procedure uses measurements in typical classes of consumers defined by experts to construct inference engines that, most of the times, only estimate peak loads. In this paper, the definition of classes was performed by clustering the collected load diagrams. Artificial Neural Networks (ANN) were then used for load Curve estimation. This article describes the adopted methodology and presents some representative results. Performance attained is discussed as well as a method to achieve confidence intervals of the main predicted diagrams.

2008

Artificial Neural Networks Applied to Reliability and Well-Being Assessment of Composite Power Systems

Authors
Leite da Silva, AML; de Resende, LC; da Fonseca Manso, LAD; Miranda, V;

Publication
2008 10TH INTERNATIONAL CONFERENCE ON PROBABILISTIC METHODS APPLIED TO POWER SYSTEMS

Abstract
This paper presents a new methodology for assessing both reliability and well-being indices for composite generation and transmission systems. Firstly, a transmission network reduction is applied to find an equivalent for assessing composite reliability for practical large power systems. After that, in order to classify the operating states, Artificial Neural Networks (ANNs) based on Group Method Data Handling (GMDH) techniques are used to capture the patterns of the operating states, during the beginning of the non-sequential Monte Carlo simulation (MCS). The idea is to provide the simulation process with an intelligent memory, based only on polynomial parameters, to speed up the evaluation of the operating states. For the conventional reliability assessment, the ANNs are used to classify the operating states into success and failure. However, for the well-being analysis, only success states are classified into healthy and marginal by the ANNs. The proposed methodology is applied to the IEEE Reliability Test System 1996 and to a configuration of the Brazilian South-Southeastern System.

2008

Improvement in Wind Power Forecasting Based on Information Entropy-Related Concepts

Authors
Bessa, R; Miranda, V; Gama, J;

Publication
2008 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, VOLS 1-11

Abstract
This paper reports new results in adopting entropy concepts to the training of mappers such as neural networks to perform wind power prediction as a function of wind characteristics (mainly speed and direction) in wind parks connected to a power grid. It also addresses the differences relevant to power system operation between off-line and on-line training of neural networks. Real case examples are presented.

2008

Promotion of new wind farms based on a decision support system

Authors
Ramirez Rosado, IJ; Garcia Garridoa, E; Fernandez Jimenez, LA; Zorzano Santamaria, PJ; Monteiro, C; Miranda, V;

Publication
RENEWABLE ENERGY

Abstract
The integration in electric power networks of new renewable energy facilities is the final result of a complex planning process. One of the important objectives of this process is the selection of suitable geographical locations where such facilities can be built. This selection procedure can be a difficult task because of the initially opposing positions of the different agents involved in this procedure, such as, for example, investors, utilities, governmental agencies or social groups. The conflicting interest of the agents can delay or block the construction of new facilities. This paper presents a new decision support system, based on Geographic Information Systems, designed to overcome the problems posed by the agents and thus achieve a consensual selection of locations and overcome the problems deriving from their preliminary differing preferences. This paper presents the description of the decision support system, as well as the results obtained for two groups of agents useful for the selection of locations for the construction of new wind farms in La Rioja (Spain).

2008

Hybrid Systems

Authors
Miranda, V;

Publication
Modern Heuristic Optimization Techniques

Abstract

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