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Mostrando ítems 1-20 de 269

    • A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability 

      Renedo Anglada, Javier; Rouco Rodríguez, Luis; García Cerrada, Aurelio; Sigrist, Lukas
      This paper proposes a new reactive-power control strategy for High Voltage Direct Current multi-terminal systems with Voltage Source Converter stations (VSC-HVDC) to improve transient stability in electric power transmission ...

    • A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability 

      Renedo Anglada, Javier; Rouco Rodríguez, Luis; García Cerrada, Aurelio; Sigrist, Lukas (2019-09-01)
      This paper proposes a new reactive-power control strategy for High Voltage Direct Current multi-terminal systems with Voltage Source Converter stations (VSC-HVDC) to improve transient stability in electric power transmission ...

    • A comparison of eigenvalues obtained with two dynamic simulation software packages 

      Persson, Jonas G.; Slootweg, Johannes G Han; Rouco Rodríguez, Luis; Söder, Lennart; Kling, Wil L Wil (Sin editorial (Bolonia, Italia), 2003-06-23)
      Eigenvalues of a power system give a good picture of the stability in the current operating point. In this paper the linear analysis capabilities of two software packages are evaluated and compared. It is shown in which ...

    • 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 fundamental study on the impact of HVDC lines on transient stability of power systems 

      Sigrist, Lukas; Echavarren Cerezo, Francisco; Rouco Rodríguez, Luis; Panciatici, Patrick (Eindhoven University of Technology (Eindhoven, España), 29/06/2015)
      An increasing number of HVDC lines are currently deployed all around the world. HVDC links are either based on line-commutated converters (LCC) or on voltage-source converters (VSC) technologies. This paper presents a ...

    • A high frequency power transformers model for network studies and tdsf monitoring 

      López Fernández, Xosé Manuel; Rouco Rodríguez, Luis; Álvarez-Mariño, Casimiro; Gago García, Hugo; Vila Montañés, Carlos
      In this paper a high frequency power transformer model for network studies is presented. The model combines white and black box representations in a package implemented as “compiled foreign model” of MODELS language of ...

    • 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 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 method for the design of UFLS schemes of small isolated power systems 

      Sigrist, Lukas; Egido Cortés, Ignacio; Rouco Rodríguez, Luis (2012-05-01)
      This paper presents a systematic method for the design of robust and efficient underfrequency load-shedding (UFLS) schemes. UFLS schemes play an important role in protecting the system integrity. The systematic method ...

    • 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 monovoltage equivalent model of bi-voltage autotransformer-based electrical systems in railways 

      Pilo De La Fuente, Eduardo; Rouco Rodríguez, Luis; Fernández Cardador, Antonio; Abrahamsson, Lars (2012-04-01)
      This paper presents an equivalent model that allows representing bi-voltage autotransformer based systems (such as 2x25kV AC, 2x15kV AC) as if they were mono-voltage systems. This model can be used for symmetrical (such ...

    • 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 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), 1999-09-14)
      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 (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 simple rule-based energy management system for off-grid systems 

      Sigrist, Lukas; Rouco Rodríguez, Luis; Saboya Bautista, Inmaculada; Díez Maroto, Luis
      Off-grid systems are systems that are not interconnected with the grid and that congruently operate in islanded mode permanently. In order to operate the off-grid system efficiently, an energy management system (EMS) is ...

    • A simplified algorithm to solve optimal power flows in hybrid VSC-based ACDC systems 

      Renedo Anglada, Javier; Ibrahim, Ahmad Asrul; Kazemtabrizi, Behzad; García Cerrada, Aurelio; Rouco Rodríguez, Luis; Zhao, Quanyu; García González, Javier
      High Voltage Direct Current systems based on Voltage Source Converters (VSC-HVDC) are increasingly being considered as a viable technology with advantages, above all when using underground or submarine cables for bulk power ...

    • A simplified algorithm to solve optimal power flows in hybrid VSC-based ACDC systems 

      Renedo Anglada, Javier; Ibrahim, Ahmad Asrul; Kazemtabrizi, Behzad; García Cerrada, Aurelio; Rouco Rodríguez, Luis; Zhao, Quanyu; García González, Javier (2019-09-01)
      High Voltage Direct Current systems based on Voltage Source Converters (VSC-HVDC) are increasingly being considered as a viable technology with advantages, above all when using underground or submarine cables, for bulk ...

    • A simplified approach to detect undervoltage tripping of wind generators 

      Sigrist, Lukas; Rouco Rodríguez, Luis (Eindhoven University of Technology (Eindhoven, España), 29/06/2015)
      This paper proposes a simplified but fast approach based on a Norton equivalent of wind generators to detect undervoltage tripping of wind generators. This approach is successfully applied to a real wind farm. Today, most ...