Browsing by Author "Curea, O."
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Item Digital control of a three-phase four-leg inverter under unbalanced voltage conditions(2007) Vechiu, I.; Curea, O.; Camblong, H.; Ceballos, S.; Villate, J. L.; POWER ELECTRONICS AND SYSTEM EQUIPMENT; GENERALIn this paper, the implementation of an innovative inverter control strategy based on the symmetrical components is presented. Symmetrical components of the inverter output voltage and current are decomposed into dq DC quantities to control a three-phase four-leg inverter. This kind of inverter can be a good choice for the applications with hybrid power system based on renewable energy used to supply unbalanced loads. The addition of a fourth leg provides an extra degree of freedom, making possible to handle the neutral current caused by the unbalanced load. Simulation results are compared with experimental results for a prototype inverter to verify the validity of the proposed control strategy.Item Innovative permanent magnet generator for an easy integration into direct drive wind turbines(2007) Robles, E.; Zaragoza, J.; Merino, J. M.; Ceballos, S.; Vechiu, I.; Curea, O.; RENOVABLES OFFSHORE; Tecnalia Research & Innovation; POWER ELECTRONICS AND SYSTEM EQUIPMENTPermanent Magnet (PM) direct driven synchronous generators are becoming an interesting solution to implement in large wind turbines. They are simpler, have less maintenance costs, and offer increased efficiencies. The objective of this project is to analyse this alternative with different power electronics and improved control algorithms. The standard PM machines have a very poor characterisation in terms of electrical parameters for modelisation. In this work, a new PM generator has been built and characterisation test realized. This new generator has been introduced in a test bench, and will be connected to grid through a back-to-back multilevel converter.Item Micro-grids project, Part 1: Analysis of rural electrification with high content of renewable energy sources in Senegal(2009-10) Camblong, H.; Sarr, J.; Niang, A. T.; Curea, O.; Alzola, J. A.; Sylla, E. H.; Santos, M.; Tecnalia Research & Innovation; POWER SYSTEMSAfrica is the poorest continent in the world and this poverty is linked to the lack of access to energy of its population. A big part of inhabitants live in rural zones where the lack of energy and in particular of electricity is still more flagrant. The aim of the Micro-grids project was to promote the electrification of rural regions of Senegal by the installation of micro-grids with high content of renewable energies. This paper presents some results of this project. Surveys have been carried out in three regions of Senegal to study the needs of electrical energy of non-electrified rural villages' households. These surveys have led to the estimation of electricity needs of the concerned households. The potential in renewable energies of the three regions has also been examined. It has been concluded that the solar energy potential is excellent while the wind energy potential can be interesting in some specific sites. The biomass could also be an efficient source if livestock farming was properly managed in the future. Moreover, many events have been carried out in the three regions to analyse the obstacles for the development of micro-grids in the Senegalese energy context, and to establish suitable solutions to overcome these obstacles. The results presented in this paper have been used to design a rural electrification kit which is described in another paper. Now the Micro-grids' consortium hopes to set up a new project to apply the designed kit on some rural non-electrified villages.