Before building a microgrid, it is interesting to think about its optimal sizing design. How much the number of PV panels, batteries, wind turbines, fuel cells… that must be chosen into the microgrid. The best selection and the effective coordination between the different resources into the microgrid are so important and represent a crucial and challenging task. In this paper a methodology is developed to optimize the sizing design of an isolated microgrid composed of batteries, load and PV panels. The proposed method is based on the system reliability and the low cost of building taking into account some constraints related to energy limits and the supply demand balance. The loss of power supply probability (LPSP) as a reliability index of a microgrid is computed for different combination of PV panels and batteries. The optimal sizing design corresponds to the configuration which compromises between the low cost and the reliability system. The simulation results of this method are presented in this paper to prove its effectiveness.

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Distribution power networks are accommodating more and more generation and most of them are based on renewable sources, like wind power. Then, this new generation, generally known as distributed generation (DG), has a stochastic power production that affects technically the network in different ways. However, availability and power quality must be kept within standard limits. Deterministic approach can not cope with this issue and a probabilistic assessment is needed. Wind power has a high level of integration around the world. Then, its impact of voltage profile in a distribution network is analyzed.

In the last decades there have been great advances in electronic, information and communication technologies. Up to date, any of these advances have been implemented in electrical systems, but some difficulties have been encountered, particularly regarding to the integration of intelligent electronic devices from different manufactures into a centralized system. With the aim of solving the above mentioned problem, the standard IEC 61850 was developed to specify communication networks in substations.In addition to control and protection functions, the information model created around IEC 61850 series can help the development of other applications related with electrical monitoring systems. Monitoring can be used to achieve a variety of benefits for utilities, including maintenance prediction, failure prevention, active control, improved commissioning tests and more accurate end of life assessments. Examples of application that could be highly benefited by the adoption of IEC 61850 as standard for communications in the power electrical industry are power quality monitoring and condition based maintenance.In this paper, the new standard IEC61850 and the new opportunities that it can offer to the electrical industry are presented. Firstly, a brief presentation of IEC61850 and the main benefits it provides are described. Finally, a more detailed description of the possibilities that IEC61850 can offer in the field of power quality monitoring and condition based maintenance (CBM) is highlighted.