Now showing items 1-20 of 98

    • A Corrective Load Shedding Scheme to Mitigate Voltage Collapse 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis (01/01/2006)
      Voltage stability is concerned with the ability of a power system to maintain acceptable voltages at all buses. A measure of the power system voltage stability is the distance to the saddle node bifurcation of the power ...
    • A least-squares approach to estimate Lagrange multipliers in a combined method to voltages collapse detection 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López, G.; Cacho, F.; Pézic, M. (Sin editorial (Vilamoura, Portugal), 03/07/2003)
      Voltage stability is concerned with the ability of a power system to maintain acceptable voltages at all buses. A measure of the power system voltage stability is the distance to the saddle node bifurcation of the power ...
    • A load shedding algorithm for improvement of load margin to voltage collapse 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López, G. (Sin editorial (Bolonia, Italia), 23/06/2003)
      Voltage stability is concerned with the ability of a power system to maintain acceptable voltages at all buses. A measure of the power system voltage stability is the distance to the saddle node bifurcation of the power ...
    • A mixed-integer LP-based network topology optimization algorithm for overload alleviation 

      Lobato Miguélez, Enrique; Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Navarrete Fernández, María Luisa; Casanova Lafarga, Rosa; López Camino, Gerardo (Sin editorial (Bolonia, Italia), 23/06/2003)
      Line switching is used in power system operation to alleviate branch overloads. This paper presents a mixed-integer linear programming algorithm that determines the optimal switching strategies to remove or reduce overloads ...
    • A power flow solvability identification and calculation algorithm 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis (01/01/2006)
      This paper presents a continuation and optimization based algorithm to detect power flow unsolvability. In addition, the algorithm obtains the power flow solution, if it exists, no matter how ill-conditioned the power ...
    • A power generation redispatch algorithm for competitive electricity markets. 

      Barrado Sánchez, Alberto Carlos; Lobato Miguélez, Enrique; Peco González, Jesús Pascual; Rouco Rodríguez, Luis (Sin editorial (Leicester, Reino Unido), 14/09/1999)
      The technical feasibility of a power generation dispatch in competitive electricity markets consists of not having any overloaded equipment not only in case of normal operating condition but also when any contingency ...
    • A practical approach to solve power system constraints with application to the Spanish electricity market 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Gómez San Román, Tomás; Echavarren Cerezo, Francisco; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López Camino, Gerardo (01/11/2004)
      The solution of power system constraints is an important issue that has to be addressed to achieve a fair operation of a competitive electricity market. In the Spanish electricity market, the System Operator (SO) is in ...
    • A tool for optimal operation and design of batteries and its applications to self-consumption 

      Fernández de Bobadilla, Jose María; Lobato Miguélez, Enrique; Sigrist, Lukas; González García, Alezeia
      This paper presents a tool for optimal operation and design of batteries and its applications to self-consumption. The recent improvements in capabilities and costs of battery storage technologies might enable new business ...
    • A tool for optimal operation and design of batteries and its applications to self-consumption 

      Fernández de Bobadilla, Jose María; Lobato Miguélez, Enrique; Sigrist, Lukas; González García, Alezeia
      This paper presents a tool for optimal operation and design of batteries and its applications to self-consumption. The recent improvements in capabilities and costs of battery storage technologies might enable new business ...
    • Un algoritmo heurístico de despacho preventivo de potencia activa. 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; López Camino, Gerardo (Sin editorial (Lisboa, Portugal), 07/07/1999)
      Este artículo presenta un algorítmo heurístico de despacho preventivo de potencia activa. El propósito de este algoritmo es determinar la variación del despacho de potencia activa de un sistema eléctrico para que en caso ...
    • An Integrated Tool for Analysis of Power System Constraints in the Spanish Electricity Market 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López, G.; García Castillejo, J. (Sin editorial (Seattle, WA, España), 16/07/2000)
      The role of the System Operator in the Spanish electricity market, as it started on January 1st 1998, is to determine the technical feasibility of the generation dispatch provided by the Market Operator. The security ...
    • An LP-based optimal power flow for transmission losses and generator reactive margins minimization 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López, G. (Sin editorial (Oporto, Portugal), 10/09/2001)
      This paper describes a mixed-integer linear programming optimal power flow. The objective function consists of minmizing transmission losses and generator reactive outputs. The problem constraints are the power flow equations ...
    • An overview of ancillary services in Spain 

      Lobato Miguélez, Enrique; Egido Cortés, Ignacio; Rouco Rodríguez, Luis; López Camino, Gerardo (01/03/2008)
      Under a deregulated environment, ancillary services (AS) are defined as the set of products separated from the energy production, which are related to security and reliability of a power system. Ancillary services can be ...
    • An ultra-capacitor for frequency stability enhancement in small-isolated power systems: models, simulation and field tests 

      Egido Cortés, Ignacio; Sigrist, Lukas; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Barrado Sánchez, Alberto Carlos (01/01/2015)
      The most relevant issue in operation of isolated power systems is frequency stability. Frequency stability is concerned with the ability of generators to supply the loads at an acceptable frequency after a disturbance. ...
    • Aplicación práctica de un despacho preventivo de activa: Redespacho de generación efectivos y de compensación 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López Camino, Gerardo (Sin editorial (Madrid, España), 04/07/2001)
      Los criterios técnicos de operación del sistema eléctrico español exigen que los flujos de potencia por las líneas y transformadores del sistema estén dentro de valores admisible, en funcionamiento normal y en caso de ...
    • Application of neural networks to the management of voltage constraints in the Spanish market 

      Ugedo Álvarez-Ossorio, Alejandro; Lobato Miguélez, Enrique (01/09/2011)
      The security criteria of a power system require that branch power flows and bus voltages are within their limits, not only in normal operating conditions but also when any credible contingency occurs. In the Spanish ...
    • ARO: Una herramienta para el análisis de restricciones de operación en el mercado español de energía eléctrica 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Navarrete Fernández, María Isabel; Casanova Lafarga, Rosa; López Camino, Gerardo (01/05/2001)
      El tratamiento de restricciones técnicas impuestas por la red de transporte en mercados de energía eléctrica, cuya casación de ofertas de generación y demanda se realiza ignorando la red, es una tarea importante. Este es ...
    • Barriers to the implementation of response options aimed at mitigating the impact of wind power on electricity systems 

      Olmos Camacho, Luis; Cossent Arín, Rafael; Lobato Miguélez, Enrique; Gómez San Román, Tomás (01/09/2011)
      Increasing shares of renewable energy in transmission and distribution grids are significantly changing the way electricity systems must function. While these technologies offer great opportunities to fight climate change ...
    • El colapso de tensión: Causas y soluciones (I/II) 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Rodríguez García, Juan Manuel (01/01/2006)
      El colapso de tensiones constituye uno de los fenómenos más estudiados en los sistemas de energía eléctrica durante los últimos años. El colapso de tensiones está íntimamente relacionado con el estudio de la estabilidad ...