Aportaciones a la mejora de los sistemas híbridos de generación y optimización de la calidad del suministro a partir de generadores mini eólicos. Aplicación a sistemas monofásicos
[EN] The present PhD work falls in the field the power quality and stability improvement applied in single phase electrical grids as microgrids and small smart grids. Distributed integration of different energy sources, including renewable sources based on small wind electric systems, is commonly pr...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | español |
| OAI Identifier: | oai:riunet.upv.es:10251/61454 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/61454 |
| Access Level: | acceso abierto |
| Palabra clave: | Sistemas híbridos de generación y optimización Calidad del suministro Generadores mini eólicos Filtro Kalman Filtros activos Identificación Sistemas monofásicos TECNOLOGIA ELECTRONICA |
| Sumario: | [EN] The present PhD work falls in the field the power quality and stability improvement applied in single phase electrical grids as microgrids and small smart grids. Distributed integration of different energy sources, including renewable sources based on small wind electric systems, is commonly present in these electrical grids. The power electronics converters used in these small wind electric systems can also be used as active power filters so, in cases that the wind energy resource is low, the available power of the power converter could be used to improve the grid quality and stability by reducing harmonics and compensating fundamental reactive power. By using the appropriate control techniques, the power converter can help to mitigate the nonefficient phenomena present in the grid at the same time that it is delivering active power to the power network that is, working as a hybrid compensation-generation system. This PhD work presents a study and analysis of such hybrid systems and their contribution to the improvement of low voltage single phase microgrid and smart grid networks. Based on the nonefficient effects produced by non-linear loads and electronic power systems in both microgrids and Smart Grid networks, a new adaptive method is proposed for the measurement, analysis and correction (elimination or attenuation) of the harmonic, interharmonic and subharmonic components present in the electrical system. It will be suitable for its application to hybrid generation-compensation systems based on small wind electric systems connected in single phase low voltage networks. The proposed method is based on the Kalman filter. It aims to exactly detect the frequency components present in an electrical signal. The number of components is determined, and for each one of them, their magnitude and phase, and their projections on the quadrature axes (¿, ß). In order to provide greater flexibility and modularity to the proposed method, the frequency spectrum of the signal is separated into frequency bands. This helps to mitigate, in part, some of the disadvantages of the Kalman filter. Detection of the number of frequency components of the signal, its separation into frequency bands and the Kalman filter estimation of each one, are the main parts or subsystems of the proposed method. Also, after determining the nonefficient phenomena present in the common connection point with the grid, a current control strategy is proposed to generate the reference current for the power electronic converter control system. This reference current allows the grid injection of active power as well as the compensation or reduction of the no efficient phenomena (harmonics, inter-harmonics, sub-harmonics and / or reactive power). Simulation results of the proposed method for different loads and supply conditions are presented. In addition, a comparison between different cases is also included. Finally, conclusions, contributions, future works and derived publications are presented. |
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