Now showing items 1-20 of 26

  • 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)
    Conference report
    Open Access
    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
    Restricted access - publisher's policy
    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 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)
    Conference report
    Open Access
    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 ...
  • Adaptive control for the synchronization of multiple robot manipulators with coupling time-delays 

    Nuño Ortega, Emmanuel; Basañez Villaluenga, Luis; Ortega, Romeo (2010)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • 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
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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)
    Conference lecture
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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
    Open Access
    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)
    Conference report
    Open Access
    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
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  • 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
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    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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Passive bilateral teleoperation framework for assisted robotic tasks 

    Nuño Ortega, Emmanuel; Basañez Villaluenga, Luis; Ortega, Romeo (Institute of Electrical and Electronics Engineers, 2006-04)
    Conference report
    Open Access
    This paper addresses the problem of stable bilateral teleoperation, through a time-delayed communication channel, for a n-DOF system without position drift. The classical wave variables-based scheme encodes velocity and ...
  • Passivity-based control for bilateral teleoperation: A tutorial 

    Nuño Ortega, Emmanuel; Basañez Villaluenga, Luis; Ortega, Romeo (2011-03)
    Article
    Restricted access - publisher's policy
    This tutorial revisits several of the most recent passivity-based controllers for nonlinear bilateral teleoperators with guaranteed stability properties. These schemes, which include scattering–based, damping injection ...
  • Position tracking using adaptive control for bilateral teleoperators with time-delays 

    Nuño Ortega, Emmanuel; Basañez Villaluenga, Luis; Ortega, Romeo; Obregón-Pulido, Guillermo (2010)
    Conference report
    Restricted access - publisher's policy
    This paper presents two versions of adaptive controllers for nonlinear bilateral teleoperators, each providing asymptotic convergence of velocity and position errors to zero, independent of constant time-delays. Moreover, ...
  • Power factor compension of electrical circuits: a control theory wiewpoint 

    García Canseco, Eloísa; Griñó Cubero, Robert; Ortega, Romeo; Salichs Vivancos, Miguel; Stankovic, Alexander (2005-10)
    Conference report
    Open Access
    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 ...
  • Power flow control of a doubly-fed induction machine coupled to a flywheel 

    Batlle Arnau, Carles; Dòria Cerezo, Arnau; Ortega, Romeo (2004-05)
    External research report
    Open Access
    We consider a doubly-fed induction machine –controlled through the rotor voltage and connected to a variable local load- that acts as an energy-switching device between a local prime mover (a flywheel) and the electrical ...
  • Power Flow Control of a Doubly-Fed Induction Machine Coupled to a Flywheel 

    Batlle Arnau, Carles; Dòria Cerezo, Arnau; Ortega, Romeo (Lavoisier, 2005-08)
    Article
    Open Access
    We consider a doubly–fed induction machine controlled through the rotor voltage and connected to a variable local load—that acts as an energy–switching device between a local prime mover (a flywheel) and the electrical ...