<?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>0121-750X</journal-id>
<journal-title><![CDATA[Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[ing.]]></abbrev-journal-title>
<issn>0121-750X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Distrital Francisco José de Caldas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-750X2019000100064</article-id>
<article-id pub-id-type="doi">10.14483/23448393.13760</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Optimized Hierarchical Control for an AC Microgrid Under Attack]]></article-title>
<article-title xml:lang="es"><![CDATA[Control Jerárquico Optimizado para una Microrred de CA Bajo Ataque]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toro]]></surname>
<given-names><![CDATA[Vladimir]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baron-Prada]]></surname>
<given-names><![CDATA[Eder]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mojica-Nava]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>64</fpage>
<lpage>82</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-750X2019000100064&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-750X2019000100064&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-750X2019000100064&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Context: An inverter-based microgrid working in islanded mode can suffer cyber-attacks, these can be done against either the local controller or the communication links among the inverters. Secondary control is able to reject those attacks, however, a tertiary control action is necessary in order to stabilize the power flow among the microgrid.  Method: Confidence factor technique allows to reject attacks in a microgrid acting directly over the secondary control, however, this technique omits other factor related to the power available. In this case, secondary control was complemented with a tertiary control that includes optimization criteria.  Results: An inverter-based microgrid is simulated in Matlab for different scenarios and under cyber- attack, this allows checking the correct response of the controller under attacks and the effective power- sharing among inverters.  Conclusions: The tertiary control allows stabilizing the active power of the system after the rejection of a cyber-attack by the secondary control. Each inverter supplies active power according to its maximum power rating without affecting the stability of the whole system.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Contexto: Una microrred de CA (corriente alterna) basada en inversores y que funciona en modo isla puede ser v´&#305;ctima de ciberataques, estos pueden ir contra el controlador o contra el sistema de comunicaciones entre los nodos; el control secundario puede rechazar el ataque, sin embargo, la acción de un controlador terciario es necesaria para estabilizar el flujo de potencia en la microrred.  Método:  La técnica basada en factores de confianza permite repeler ataques a la microrred actuando directamente sobre el controlador secundario, sin embargo, esta técnica omite factores de optimización; en este caso, las sen&#732;ales de control generadas a partir de los factores de confianza fueron complementa- das en un controlador terciario para incluir criterios de optimizacio´n.  Resultados: Se simula una microrred en Matlab para diferentes escenarios y ataques, permitiendo verificar la acertada respuesta del controlador ante ataques ciberne´ticos.  Conclusiones: El control terciario permite estabilizar la potencia del sistema ante el rechazo de un ciberataque por parte del control secundario. Cada inversor entrega potencia de acuerdo con su rango ma´ximo de potencia, sin afectar la establidad de todo el sistema.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Microgrid]]></kwd>
<kwd lng="en"><![CDATA[cyber-attack]]></kwd>
<kwd lng="en"><![CDATA[distributed control]]></kwd>
<kwd lng="en"><![CDATA[hierarchical control]]></kwd>
<kwd lng="en"><![CDATA[Language: English.]]></kwd>
<kwd lng="es"><![CDATA[Ciberataque]]></kwd>
<kwd lng="es"><![CDATA[control distribuido]]></kwd>
<kwd lng="es"><![CDATA[control jerárquico]]></kwd>
<kwd lng="es"><![CDATA[microrred.]]></kwd>
</kwd-group>
</article-meta>
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