Fault Detection of Wind Turbine Induction Generators through Current Signals and Various Signal Processing Techniques

Producción CientíficaIn the wind industry (WI), a robust and effective maintenance system is essential. To minimize the maintenance cost, a large number of methodologies and mathematical models for predictive maintenance have been developed. Fault detection and diagnosis are carried out by processing and analyzing various types of signals, with the vibration signal predominating. In addition, most of the published proposals for wind turbine (WT) fault detection and diagnosis have used simulations and test benches. Based on previous work, this research report focuses on fault diagnosis, in this case using the electrical signal from an operating WT electric generator and applying various signal analysis and processing techniques to compare the effectiveness of each. The WT used for this research is 20 years old and works with a squirrel-cage induction generator (SCIG) which, according to the wind farm control systems, was fault-free. As a result, it has been possible to verify the feasibility of using the current signal to detect and diagnose faults through spectral analysis (SA) using a fast Fourier transform (FFT), periodogram, spectrogram, and scalogram

Ciencia, tecnología y energías renovables: una aproximación a sus concepciones y contradicciones

This paper gives a brief historical overview of the concepts of science, technology, macroscience and technoscience to set in which of them the generation of energy by alternative means should be placed. In addition, it shows ways of understanding the science-technology duality and its participation in societies to present how the introduction of renewable energies in the world’s electrical systems intends to contribute towards solving the increase in energy demand. It not only discusses the supposed environmental benefits, which are considered greater than those of conventional technologies, but also the “goodness” of science and the risks not valued by designers of artefacts and the people who decide their implementation. Lastly, based on a Mexican case, it analyses two relevant and little considered aspects that can affect, with different grades of intensity, the societies in which these technologies are implemented: the life cycle of aerogenerators and photovoltaic systems, and the repercussions in the territory.O artigo faz um breve percurso histórico das concepções de ciência, tecnologia, macrociência e tecnociência para saber em qual delas se encontra a geração de energia por meios alternativos. Além disso, mostra as formas de conceber o binômio ciência-tecnologia e sua participação nas sociedades para apresentar como a introdução das energias renováveis nos sistemas eléctricos mundiais tenta contribuir para a solução do aumento da demanda energética. No entanto, aqui não apenas são questionados os supostos benefícios ambientais, consideravelmente maiores que as tecnologias convencionais, mas também se reflete sobre a “bondade” da ciência e os riscos não valorizados pelos designers das peças e por quem decide sua aplicação nos grupos sociais. Para se aproximar da realidade dessas formas de produção, são analisados, a partir de um caso mexicano, dois aspectos relevantes e pouco considerados que podem afetar com diferente intensidade as sociedades onde são implementados: o ciclo de vida de sistemas fotovoltaicos e aerogeradores, e as repercussões no território.El artículo hace un breve recorrido histórico de las concepciones de ciencia, tecnología, macrociencia y tecnociencia para ubicar en cuál de ellas se encuentra la generación de energía por medios alternos. Además, muestra las formas de concebir el binomio ciencia-tecnología y su participación en las sociedades para presentar cómo la introducción de las energías renovables en los sistemas eléctricos mundiales intenta contribuir a la solución del incremento de la demanda energética. Sin embargo, aquí no sólo se cuestionan los supuestos beneficios ambientales, considerablemente mayores respecto a las tecnologías convencionales, sino que se reflexiona sobre la “bondad” de la ciencia y los riesgos no valorados por los diseñadores de los artefactos y por quien decide su aplicación en los grupos sociales. Por último, a partir de un caso mexicano, se analizan dos aspectos relevantes y poco considerados que pueden afectar con diferente intensidad a las sociedades donde estas formas de producción energética se implementan: el ciclo de vida de sistemas fotovoltaicos y aerogeneradores, y las repercusiones en el territorio

Análisis térmico de las celdas fotovoltaicas en un sistema interconectado a la red

Tesis de Maestría en Ingeniería Energética presentada a la Facultad de Ingeniería Mecánica Eléctrica de la Universidad Veracruzana. Región Veracru

Erratum to: Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition) (Autophagy, 12, 1, 1-222, 10.1080/15548627.2015.1100356

non present