Abstract
Most of the Power Quality surveys in industrialized countries are performed according to the parameters defined in the EN50160 standard, which sets one-week measurement periods with ten-minute sampling time for most power quality disturbances such as flicker and harmonics. Both the sampling periods and the measurement period have a great influence on the significance of the values obtained as well as on the conclusions taken. In this paper, an attempt is made to compare the values obtained with different sample frequencies and time windows, working on instantaneous flicker (Ifl) values for a wind turbine over three weeks.

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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.

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The objective of this paper is to present novel control strategies for MicroGrid operation, especially in islanded mode. The control strategies involve mainly the coordination of secondary load-frequency control by a MicroGrid Central Controller that heads a hierarchical control system able to assure stable and secure operation when the islanding of the MicroGrid occurs and in load-following situations in islanded mode.