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This paper presents the results of inverter development for standalone renewable energy systems used in isolated communities. One of the main problems of such systems, located in isolated areas of difficult access, is the inverters. The mean time before failure of these equipments has been shown smaller than expected. In these applications the inverters should have the following features: expansion...
In this paper the authors present a multilevel inverter controlled by fuzzy logic. This system is particularly interesting when a number of distinct renewable energy DC sources, such as photovoltaic systems or fuel cells are available. After a description of the general system architecture and its controller, system performance are evaluated by means of simulations.
Paper makes a brief analysis of the current solutions for supplying electricity to self services of electrical stations and proposes new, modern solutions, based on renewable energies. Analyzed solutions propose the use of integrated systems for the supply of energy, in which the heart is combustion pile, energy storage being made in hydrogen form. To make it possible the feeding both of DC and AC...
The possible solution for electrifying rural areas of developing countries, where is far away from national grids, are off grid small hybrid systems using renewable energy. The photovoltaic(PV) hybrid system was installed in the village of Darsilami in Gambia and since December 2004 functions as a stand alone system that is used to supply electricity for a rural health clinic. All the generators are...
Microgrids (MGs) are one of the most promising electrical systems for the next years. Since the definition of the MG paradigm by the first time, the investigation in this area is growing continuously and there are numerous research projects in this moment over the world. This paper makes a survey focused on two important features of MGs: unplanned islanding detection algorithms and inverter control...
F3E (fundamental frequency front end) is the denomination for a converter with active rectifier and negligibly small DC-link-capacitance. These converters are normally used to operate 3-phase-motors, especially in applications where power regeneration is required. The simplicity and high efficiency of F3E-converters makes them suitable also for renewable energy applications (wind, water etc.), or...
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