<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-6230</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería Universidad de Antioquia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.fac.ing.univ. Antioquia]]></abbrev-journal-title>
<issn>0120-6230</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-62302020000100077</article-id>
<article-id pub-id-type="doi">10.17533/10.17533/udea.redin.20190524</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Spline adjustment for modelling solar intermittences]]></article-title>
<article-title xml:lang="es"><![CDATA[Ajuste spline para modelar intermitencias solares]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Meraz]]></surname>
<given-names><![CDATA[Raul Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Callejo]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jamed-Boza]]></surname>
<given-names><![CDATA[Luis Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso-Gómez]]></surname>
<given-names><![CDATA[Victor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Veracruzana Unidad de Ingeniería y Ciencias Químicas ]]></institution>
<addr-line><![CDATA[Xalapa ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Valladolid Escuela Universitaria de Ingenierías Agrarias ]]></institution>
<addr-line><![CDATA[Soria ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<numero>94</numero>
<fpage>77</fpage>
<lpage>86</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-62302020000100077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-62302020000100077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-62302020000100077&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT One of the reasons why photovoltaic technology is not massively installed is its variation in production. This variation is due to intermittences in the solar resource. Based on real data from the microgrid of the Renewable Energy Development Center (CEDER, Spain) and another scenario in Xalapa (México), the study determines the solar intermittences produced and grouped monthly. The period of data acquisition, in the first study, was from May 30th, 2012 to March 3rd, 2015 with the help of a Baseline Surface Radiation Network (BSNR) team; in the second, 2014 measurements were obtained from a meteorological station certified by the National Meteorological System (SMN). The analysis is based on the determination of monthly frames of reference for radiation by third-degree spline adjustments with smoothing, using the JUMP statistical application software (JMP © 2009, SAS Institute, version 8.0.2). The results of the analyses have provided important information to understand the unstable appearance of solar radiation and, in turn, will be the basis of a control system to optimize photovoltaic production.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Una de las razones por la cual la tecnología fotovoltaica no se instala de forma masiva es su variación en la producción. Esta variación es debida a las intermitencias en el recurso solar. A partir de datos realesde la microred del Centro de Desarrollo de Energía Renovable (CEDER) y un segundo escenario en Xalapa (México), el estudio determina las intermitencias solares producidas y agrupadas mensualmente.. El periodo de adquisición de datos, en el primer estudio, fue del 30 de mayo de 2012 al 3 de marzo de 2015 con la ayuda de un equipo Baseline Surface Radiation Network (BSNR); en el segundo se obtuvieron mediciones del año 2014 provenientes de una estación meteorológica certificada por el Sistema Meteorológico Nacional (SMN). El análisis se fundamenta en determinar marcos de referencia mensuales de la radiación mediante ajustes spline de tercer grado con suavización, utilizando el software de aplicación estadística JUMP (JMP©2009, Instituto SAS, versión 8.0.2). Los resultados de los análisis proporcionan información importante para comprender el aspecto inestable de la radiación solar y, a su vez, serán la base de un sistema de control para optimizar la producción fotovoltaica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Loss off energy]]></kwd>
<kwd lng="en"><![CDATA[radiation]]></kwd>
<kwd lng="en"><![CDATA[spline fit]]></kwd>
<kwd lng="es"><![CDATA[Pérdida de energía]]></kwd>
<kwd lng="es"><![CDATA[radiación]]></kwd>
<kwd lng="es"><![CDATA[ajuste spline]]></kwd>
</kwd-group>
</article-meta>
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