http://hdl.handle.net/10016/612 Wed, 22 May 2013 05:35:13 GMT 2013-05-22T05:35:13Z http://hdl.handle.net/10016/16765 Title: Power Quality in distribution power networks with photovoltaic energy sources Author(s): Albarracín, Ricardo; Amarís Duarte, Hortensia Abstract: Solar radiation is characterized by short fluctuations introduced by passing clouds. These solar fluctuations will produce Voltage and power fluctuations at the PCC (Point of common coupling). Flicker level should be evaluated by using a flickermeter according to the standard IEC 61000-4-15. Models of the solar fluctuation, photovoltaic modules and power converter are shown in this paper and the flickermeter model is tested according to the IEC requirements and the CIGRE/CIRED/UIE test protocol. Wed, 31 Dec 2008 23:00:00 GMT http://hdl.handle.net/10016/16765 2008-12-31T23:00:00Z http://hdl.handle.net/10016/16238 Title: A Partial Discharges Acquisition and Statistical Analysis Software Author(s): Ardila-Rey, Jorge Alfredo; Martínez Tarifa, Juan Manuel; Robles, Guillermo; Rojas-Moreno, Mónica Victoria; Albarracín, Ricardo Abstract: Partial Discharges (PDs) are responsible forunexpected failures in power system equipment, so theirmeasurement is a fundamental tool for electrical equipmentmaintenance. In order to characterize PDs activity, somestatistical magnitudes are necessary. For this purpose, PDsacquisition and processing is an important tool for criticaldecisions related to power systems. In this paper, the maindifficulties and challenges facing PDs detection, acquisition andprocessing are presented. Results will be compared to acommercial PDs detection system. Sat, 12 May 2012 22:00:00 GMT http://hdl.handle.net/10016/16238 2012-05-12T22:00:00Z http://hdl.handle.net/10016/16237 Title: Antenna selection and frequency response study forUHF detection of partial discharges Author(s): Robles, Guillermo; Martínez-Tarifa, Juan Manuel; Rojas-Moreno, Mónica Victoria; Albarracín, Ricardo; Ardila-Rey, Jorge Alfredo Abstract: Partial Discharge (PD) detection is a widely extended technique for electrical insulation diagnosis. Classical PD detection by means of phase resolved patterns require electrical connections to the power equipment and is sensitive to many noise sources. Ultra High Frequency (UHF) detection techniques are being recently proposed to overcome these problems, and to detect partial discharges on-line. In this paper, four antennas will be tested in order to compare their response to this physical phenomenon. Sat, 12 May 2012 22:00:00 GMT http://hdl.handle.net/10016/16237 2012-05-12T22:00:00Z http://hdl.handle.net/10016/16063 Title: Compensación de sobretensiones en redes eléctricas con generadores fotovoltaicos Author(s): Albarracín Sánchez, Ricardo Abstract: El presente documento está estructurado según sigue. En el capítulo 1 se hace una exposición sobre el estado del arte referente al problema de sobretensiones que presentan los sistemas eléctricos con presencia de generadores fotovoltaicos. En el capítulo 2 se explica brevemente qué se entiende por energía solar fotovoltaica y se presenta un estudio detallado sobre recurso solar. En el capítulo 3 se presenta el modelo completo de un sistema fotovoltaico conectado a la red eléctrica y se explica el funcionamiento del control de tensión en la red. Además, se detallan los elementos y se modelan cada una de las partes que componen al sistema fotovoltaico conectado a la red. En el capítulo 4 se estudia en detalle la capacidad de generación/absorción de potencia reactiva que ofrecen los generadores fotovoltaicos conectados a la red eléctrica. En el capítulo 5, se presentan las simulaciones y resultados obtenidos. Por último, se finaliza el documento presentando el capítulo 6 con las principales conclusiones y aportaciones. Y se finaliza el documento con el capítulo 7, trabajos futuros a realizar. Tue, 31 Aug 2010 22:00:00 GMT http://hdl.handle.net/10016/16063 2010-08-31T22:00:00Z