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Mostrando ítems 1-20 de 45

    • A Corrective Load Shedding Scheme to Mitigate Voltage Collapse 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis (2006-01-01)
      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), 2003-07-03)
      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), 2003-06-23)
      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 parabolic predictor for more efficient calculation of total transfer capability 

      Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Urretavizcaya Tato, Marta; Lumbreras Sancho, Sara
      Total Transfer Capability (TTC) is defined as the amount of electric power that can be transferred between two interconnected transmission networks under some established security system conditions such as maximum power ...

    • A parabolic predictor for more efficient calculation of total transfer capability 

      Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Urretavizcaya Tato, Marta; Lumbreras Sancho, Sara (Institute of Electrical and Electronics Engineers Power and Energy Society; Universidad Pontificia C (Madrid, España), 2021-07-29)
      Total Transfer Capability (TTC) is defined as the amount of electric power that can be transferred between two interconnected transmission networks under some established security system conditions such as maximum power ...

    • A power flow solvability identification and calculation algorithm 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis (2006-01-01)
      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 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 (2004-11-01)
      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 review of the state of the art of UFLS schemes for isolated power systems 

      Sigrist, Lukas; Rouco Rodríguez, Luis; Echavarren Cerezo, Francisco (2018-07-01)
      This paper presents a review of the state of the art of UFLS schemes for isolated power systems. Isolated power systems are especially sensitive to power imbalances and underfrequency load-shedding (UFLS) schemes are crucial ...

    • A sensitivities computation method for reconfiguration of radial networks 

      González García, Alezeia; Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Gómez San Román, Tomás (2012-08-01)
      Distribution networks are operated in a radial configuration, but their topology, especially in urban areas, is normally meshed in order to improve reliability of supply. This makes it possible to configure the network ...

    • A tool for reconfigurarion of large-scale distribution networks 

      González García, Alezeia; Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Gómez San Román, Tomás; Cabetas, J. (Sin editorial (Glasgow, Reino Unido), 2008-07-14)
      Security of supply in case of failure of high voltagemedium voltage (HVMV) substations often relies on the support provided by MV distribution networks. The structure of some MV distribution networks allows the substation ...

    • El colapso de tensión: Causas y soluciones (III) 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Rodríguez García, Juan Manuel (2006-01-01)
      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 ...

    • El colapso de tensión: Causas y soluciones (IIII) 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Rodríguez García, Juan Manuel (2006-03-01)
      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 ...

    • Contingency Analysis: A Feasibility Identification and Calculation Algorithm 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis (2005-09-01)
      This paper presents a continuation and optimization based algorithm to detect power flow unfeasibility under the occurrence of contingency hypothesis. In addition, the algorithm obtains the power flow solution under ...

    • Decision trees applied to forecasting switched shunt devices within the Spanish power system 

      Lobato Miguélez, Enrique; Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Ugedo Álvarez-Ossorio, Alejandro (2007-06-01)
      Static security assessment within a power system requires:(a) building a scenario of the power system network that represents the state of the network for a particular time spot and (b) running a number of static security ...

    • Decision trees applied to Spanish power systems applications 

      Lobato Miguélez, Enrique; Ugedo Álvarez-Ossorio, Alejandro; Rouco Rodríguez, Luis; Echavarren Cerezo, Francisco (Sin editorial (Estocolmo, Suecia), 2006-06-11)
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    • Elimination of voltage violations in the Spanish electricity market: Part I: Theory 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Gómez San Román, Tomás; Echavarren Cerezo, Francisco (2005-08-01)
      The solution of voltage violations in the Spanish electricity market must consider: (a) the connection of off-line units (considering the active and reactive power injection effect), (b) the adjustment of the voltage control ...

    • Elimination of voltage violations in the Spanish electricity market: Part II: Case study 

      Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Gómez San Román, Tomás; Echavarren Cerezo, Francisco (2005-08-01)
      The solution of voltage violations in each hourly scenario of the Spanish electricity market must consider: (a) the connection of off-line units (considering the active and reactive power injection effect), (b) the adjustment ...

    • Formulation, computation and improvement of steady state security margins in power systems. Part I: theoretical framework 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Gómez San Román, Tomás (2011-02-01)
      A steady state security margin for a particular operational point can be defined as the distance from this initial point to the secure operational limits of the system. Four of the most used steady state security margins ...

    • Formulation, computation and improvement of steady state security margins in power systems. Part II: results 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis; Gómez San Román, Tomás (2011-02-01)
      A steady state security margin for a particular operating point can be defined as the distance from this initial point to the secure operating limits of the system. Four of the most used steady state security margins are ...

    • Full active-reactive DC power flow model with loss compensation 

      Echavarren Cerezo, Francisco; Lobato Miguélez, Enrique; Rouco Rodríguez, Luis
      This paper formulates a generic DC approximation of the full active-reactive AC power flow problem. This novel approximation includes a novel linear reactive DC model than can be used to estimate bus voltage magnitudes and ...