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Gil-de-Castro A.,Research Group PAIDI TIC 168 Computational Instrumentation | Gil-de-Castro A.,University of Cordoba, Spain | Moreno-Munoz A.,Research Group PAIDI TIC 168 Computational Instrumentation | Moreno-Munoz A.,University of Cordoba, Spain | de la Rosa J.J.G.,University of Cadiz
Przeglad Elektrotechniczny | Year: 2012

In this paper, several high power lighting networks based on high pressures sodium (HPS) lamps with rated lamp powers of 70, 150 and 250 W have been set up. Those lamps have been studied with both electromagnetic and dimmable electronic ballasts, which can dim the lamp output smoothly and uniformly. Lamps connected to electronic equipment have been tested with different levels of power using dimming for a 220 V power supply. HPS lamps have been chosen because they are used in public lighting. This paper focuses on the harmonic characterization of modern HPS lamps connected to both types of devices. Harmonics under full and reduced power for several HPS lamps have been measured. It presents an investigation on the attenuation effect and a proposal of an index called the equivalent lamp index to characterize this effect on HPS lamps. Also it is concluded that using a combination of HPS lamps can result in a reduction of the current distortion. Source

Gonzalez-de-la-Rosa J.-J.,Research Group PAIDI TIC 168 Computational Instrumentation | Gonzalez-de-la-Rosa J.-J.,University of Cadiz | Aguera-Perez A.,Research Group PAIDI TIC 168 Computational Instrumentation | Aguera-Perez A.,University of Cadiz | And 4 more authors.
Measurement: Journal of the International Measurement Confederation | Year: 2016

A comparative analysis between two higher-order statistics in the frequency domain, combined with wavelets’ filters, confirms the existence of three frequency sub-bands that characterize the species emission. De-noising via wavelet eliminates the symmetrical noise and reveals non-Gaussian features. Here, we show that the spectral kurtosis enhances the low and high-frequency components with high power variability, once the filter banks are applied, revealing new zones in the spectrum that are associated to high variability in the amplitudes. Despite de-noising via wavelets, the bi-spectrum is attenuated, but it confirms the frequency pattern of the emission, denoting at the same time the non-zero skewness of these components. Complementarily, it is observed that high bi-frequencies are attenuated more severely, suggesting the idea that certain frequencies content more information regarding symmetry than others. Results have been confirmed using three common wavelet families. © 2016 Elsevier Ltd Source

Aguera-Perez A.,Research Group PAIDI TIC 168 Computational Instrumentation | Aguera-Perez A.,University of Cadiz | Palomares-Salas J.C.,Research Group PAIDI TIC 168 Computational Instrumentation | Palomares-Salas J.C.,University of Cadiz | And 4 more authors.
Journal of Wind Engineering and Industrial Aerodynamics | Year: 2014

The availability of updated information of regional wind fields is fundamental for an efficient management and prediction of wind power production. The present paper proposes a regional wind monitoring system based on the integration of different meteorological nets as a direct way to obtain this information. Concretely, we describe a monitoring system for the region of Andalusia supported by 198 stations, able to provide near surface wind field estimations with updating period of 10. min. Each of these stations has different characteristics since they are focused on measuring different environmental parameters, and most of them are below the quality level required by the World Meteorological Organization for wind measurement. Despite this drawback, the proposed monitoring system takes advantage of the high density of measurement points to produce valuable descriptions of the regional wind field. A basic geostatistical model coupled to the system achieves better results than Numerical Weather Prediction models, obtaining RMSE values of 1.52. m/s and 64.9° for speed and directional series respectively. The test confirms the tolerance of this massive monitoring system to data without quality assurance, being an interesting platform to implement crowdsourcing methodologies. © 2014 Elsevier Ltd. Source

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