<?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>1815-5901</journal-id>
<journal-title><![CDATA[Ingeniería Energética]]></journal-title>
<abbrev-journal-title><![CDATA[Energética]]></abbrev-journal-title>
<issn>1815-5901</issn>
<publisher>
<publisher-name><![CDATA[Universidad Tecnológica de La Habana José Antonio Echeverría, Cujae]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1815-59012023000200071</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Disparos incorrectos de las protecciones eléctricas de parques fotovoltaicos conectados al Sistema Eléctrico de Cuba]]></article-title>
<article-title xml:lang="en"><![CDATA[Faulty tripping of electrical protection devicesphotovoltaic solar power plants connecting to Cuban Electric Power System]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padrón Suárez]]></surname>
<given-names><![CDATA[Lenyer]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayala Chauvin]]></surname>
<given-names><![CDATA[Manuel Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Breffe]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pantoja Gómez]]></surname>
<given-names><![CDATA[Osmani]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez Hechevarría]]></surname>
<given-names><![CDATA[Maikel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Unión Eléctrica  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Tecnológica Indoamérica  ]]></institution>
<addr-line><![CDATA[Ambato ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Tecnológica de La Habana  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>71</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1815-59012023000200071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1815-59012023000200071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1815-59012023000200071&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los tradicionales sistemas de potencias se están enfrentando con el gradual y continuo avance de las fuentes renovables de generación. Los pequeños parques solares generalmente están integrados en redes de media tensión mediante múltiples líneas en topología de ramales, haciendo un estudio en una importante cuestión: las mediciones de las protecciones. Evitar disparos innecesarios no solo reduce las pérdidas económicas, sino también favorece la estabilidad del sistema. El objetivo de este trabajo es estudiar eventos de fallas registrados en parques solares en Cuba que provocan falsos disparos en las protecciones del primario de los transformadores de potencia de sus subestaciones. Simulando en DIgSILENTPowerFactory, fue demostrado que los transformadores en estrella - delta, son una fuente de corrientes de secuencia cero, condición que causa los falsos disparos. Finalmente, un cambio de conexión el transformador ha sido aplicada, permitiendo la correcta operación de las protecciones, y reduciendo los índices de consumos de los parques fotovoltaicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Conventional power systems are confronted with continuous and gradual advance of renewable power generation. Small photovoltaic power plants are usually integrated into the medium voltage grid through multiple branch lines in branched topologies, making the study of protective measures, an important issue. Avoiding unnecessary trips not only reduces economic losses but also contributes to system´s stability. The objective of this work is to study real fault events recorded in solar power plants in Cuba that cause false tripping of the protection devices installed on the primary side of the power plants transformers. Using simulations performed in DIgSILENTPowerFactory, it was shown that when transformers are wye- delta, they become zero current sources, since this is thecondition that causes false tripping. Finally, a new transformer configuration has been applied that allows the correct operation of protection system and a reduction of the feed-in of the photovoltaic systems.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fotovoltaico]]></kwd>
<kwd lng="es"><![CDATA[secuencia cero]]></kwd>
<kwd lng="es"><![CDATA[falla]]></kwd>
<kwd lng="es"><![CDATA[protecciones]]></kwd>
<kwd lng="es"><![CDATA[arquitectura de sistemas fotovoltaicos]]></kwd>
<kwd lng="es"><![CDATA[conexión del transformador]]></kwd>
<kwd lng="en"><![CDATA[Photovoltaic]]></kwd>
<kwd lng="en"><![CDATA[zero sequence]]></kwd>
<kwd lng="en"><![CDATA[fault]]></kwd>
<kwd lng="en"><![CDATA[protection]]></kwd>
<kwd lng="en"><![CDATA[architectures of solar systems]]></kwd>
<kwd lng="en"><![CDATA[transformer connection]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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