Ara es mostren els items 1-20 de 35

    • A behavioural dynamic model for constant power loads in single-phase AC systems 

      Griñó Cubero, Robert; Ortega, Romeo; Fridman, Emilia; Zhang, Jin; Mazenc, Frédéric (2021-09-01)
      Article
      Accés obert
      Constant power loads (CPLs) in power systems have a destabilizing effect that gives rise to significant oscillations or to network collapse, motivating the development of new methods to analyse their effect in AC and DC ...
    • A cyclo-dissipativity framework for power factor compensation of electrical circuits 

      García Canseco, Eloísa; Griñó Cubero, Robert; Ortega, Romeo; Salichs Vivancos, Miguel; Stankovic, Alexander (2005-10)
      Text en actes de congrés
      Accés obert
      The purpose of this paper is to bring the attention of the control community some of the aspects of the practically important, and mathematically challenging, power factor compensation problem. Our main contribution is ...
    • A feedback-based L-2-norm limiter for periodic signals 

      Griñó Cubero, Robert; Ortega, Romeo; Fossas Colet, Enric (2011-01)
      Article
      Accés restringit per política de l'editorial
      Limiting the rms value (L2 norm) of periodic signals can be a necessity in some controllers for power electronic devices. The prevailing existing solution is simply to compute, off-line, the L2 norm and then to multiply ...
    • A new approach for flux and rotor resistance estimation of induction motors 

      Bazylev, Dmitry; Dòria Cerezo, Arnau; Pyrkin, Anton A.; Bobstov, Alexey A.; Ortega, Romeo (2017-07-01)
      Article
      Accés restringit per política de l'editorial
      In this paper we address the problems of flux and rotor resistance estimation of induction motors. We propose a radically new approach that combines the recently introduced techniques of parameter estimation based observers ...
    • A Passivity-based controller without velocity measurements for the leaderless consensus of Euler-Lagrange systems 

      Nuño Ortega, Emmanuel; Ortega, Romeo; Basañez Villaluenga, Luis (2017-07-01)
      Article
      Accés obert
      This paper deals with the problem of achieving consensus of multiple interconnected Euler-Lagrange (EL) systems using the energy shaping plus damping injection principles of passivity-based control. It proposes a novel ...
    • A stator voltage oriented PI controller for the doubly-fed induction machine 

      Batlle Arnau, Carles; Dòria Cerezo, Arnau; Ortega, Romeo (Institute of Electrical and Electronics Engineers, 2007)
      Text en actes de congrés
      Accés obert
      In this paper we propose a new control scheme for the doubly–fed induction machine (DFIM) that offers significant advantages, and is considerably simpler, than the classical vector control method. In contrast with the ...
    • Active damping of a DC network with a constant power load: an adaptive observer-based design 

      Machado, Juan; Ortega, Romeo; Astolfi, Alessandro; Arocas Pérez, José; Pyrkin, Anton; Bobtsov, Alexey; Griñó Cubero, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Text en actes de congrés
      Accés obert
      This paper proposes a nonlinear, output feedback, adaptive controller to increase the stability margin of a direct-current (DC), small-scale, electrical network containing an unknown constant power load. Due to their ...
    • Active damping of a DC network with a constant power load: an adaptive passivity-based control approach 

      Machado, Juan E.; Arocas Pérez, José; He, Wei; Ortega, Romeo; Griñó Cubero, Robert (2018)
      Comunicació de congrés
      Accés obert
      This paper proposes a nonlinear, adaptive controller to increase the stability margin of a direct-current (DC) small-scale electrical network containing a constant power load, whose value is unknown. Due to their negative ...
    • Adaptive control for the synchronization of multiple robot manipulators with coupling time-delays 

      Nuño Ortega, Emmanuel; Basañez Villaluenga, Luis; Ortega, Romeo (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Two controllers capable of achieving asymptotic convergence of position and velocity errors, of the ithmanipulator within a multiple robot network, are proposed. The controllers employ adaptive techniques to find an ...
    • An adaptive observer-based controller design for active damping of a DC network with a constant power load 

      Machado, Juan E.; Ortega, Romeo; Astolfi, Alessandro; Arocas Pérez, José; Pyrkin, Anton A.; Bobtsov, Alexey; Griñó Cubero, Robert (2021)
      Article
      Accés obert
      This article explores a nonlinear, adaptive controller aimed at increasing the stability margin of a direct-current (dc), small-scale, electrical network containing an unknown constant power load (CPL). Due to its negative ...
    • Conditions for existence of equilibria of systems with constant power loads 

      Sanchez Acevedo, Santiago; Ortega, Romeo; Griñó Cubero, Robert; Bergna, Gilbert; Molinas Cabrera, Marta (2014-07-01)
      Article
      Accés restringit per política de l'editorial
      In this paper we investigate the sine qua non condition of existence of equilibria for electrical systems with external (AC or DC) sources furnishing constant power to the loads, which is a scenario encountered in modern ...
    • Conditions for existence of equilibrium points of systems with constant power loads 

      Sanchez, Santiago; Ortega, Romeo; Bergna, Gilbert; Molinas, Marta; Griñó Cubero, Robert (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper we investigate the sine qua non condition of existence of equilibria for electrical systems with external sources furnishing constant power to the loads, which is a scenario encountered in modern applications. ...
    • Coordination of multi-agent Euler-Lagrange systems via energy-shaping: Networking improves robustness 

      Nuño, Emmanuel; Ortega, Romeo; Jayawardhana, Bayu; Basañez Villaluenga, Luis (2013-10-01)
      Article
      Accés restringit per política de l'editorial
      In this paper, the robust coordination of multi-agent systems via energy-shaping is studied. The agents are nonidentical, Euler–Lagrange systems with uncertain parameters which are regulated (with and without exchange of ...
    • Coordination of multi-agent systems via energy–shaping: networking improves robustness 

      Nuño Ortega, Emmanuel; Ortega, Romeo; Jayawardhana, Bayu; Basañez Villaluenga, Luis (2012)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In this paper the problem of robust coordination of multi–agent systems via energy–shaping is studied. The agents are nonidentical, Euler–Lagrange systems with uncertain parameters. The control objective is to drive all ...
    • Corrigendum to 'On the control of non-linear processes: an IDA-PBC approach' (H. Ramírez et al., Journal of Process Control 19 (1) (2009) 405¿414) 

      Batlle Arnau, Carles; Ortega, Romeo; Sbarbaro, Daniel; Ramírez, Héctor (2010-01)
      Article
      Accés restringit per política de l'editorial
      In a recent paper [1], the Interconnection and Damping Assignment Passivity-based Control (IDA-PBC) method [2] is studied in the case when the key matching equation is not satisfied. The paper proposes to fix a desired ...
    • Dynamic energy router: energy management in electrical systems fed by multiple sources 

      Sanchez Squella, Antonio; Ortega, Romeo; Griñó Cubero, Robert; Malo Barragán, Shane Leonardo (2010-12)
      Article
      Accés obert
      In this article we consider the objective of efficient transfer of electric energy between subsystems, where each subsystem can generate, store, or consume energy.
    • Energy-based modelling and control of a multi-domain energy storage and management system 

      Batlle Arnau, Carles; Dòria Cerezo, Arnau; Fossas Colet, Enric; Ortega, Romeo (Inge Troch, Felix Breitenecker, 2006-02)
      Text en actes de congrés
      Accés obert
      We give an overview of part of the chapter of the Geoplex book devoted to examples, specifically the one which deals with electromechanical systems. We study a rather complex example of a port Hamiltonian system made of ...
    • Erratum to ‘‘An adaptive controller for nonlinear teleoperators" 

      Nuño Ortega, Emmanuel; Ortega, Romeo; Basañez Villaluenga, Luis (2011-05-01)
      Article
      Accés restringit per política de l'editorial
    • Networking improves robustness in flexible-joint multi-robot systems with only joint position measurements 

      Nuño, Emmanuel; Ortega, Romeo; Jayawardhana, Bayu; Basañez Villaluenga, Luis (2013-12)
      Article
      Accés restringit per política de l'editorial
      This paper studies the robustness in the coordination - via energy-shaping - of multiple nonidentical flexible-joint robots with only joint position measurements. The control objective is to drive all manipulators link ...
    • Nouveau routeur dynamique prenant en compte les pertes : Théorie et résultats expérimentaux 

      Ramírez, Victor; Ortega, Romeo; Sánchez-Squella, Antonio; Bethoux, Olivier; Griñó Cubero, Robert (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Dans de nombreux r eseaux, la r egulation e cace du transfert d' energie entre les sous-syst emes de production, de stockage et d'utilisation demeure un sujet di cile a traiter. Les auteurs proposent ici une nouvelle ...