Browsing by Author "Ortega, Romeo"
Now showing items 1-20 of 35
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A behavioural dynamic model for constant power loads in single-phase AC systems
(2021-09-01)
Article
Open AccessConstant 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
(2005-10)
Conference report
Open AccessThe 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
(2011-01)
Article
Restricted access - publisher's policyLimiting 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
(2017-07-01)
Article
Restricted access - publisher's policyIn 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
(2017-07-01)
Article
Open AccessThis 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
(Institute of Electrical and Electronics Engineers, 2007)
Conference report
Open AccessIn 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
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Conference report
Open AccessThis 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
(2018)
Conference lecture
Open AccessThis 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
(2010)
Conference report
Restricted access - publisher's policyTwo 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
(2021)
Article
Open AccessThis 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
(2014-07-01)
Article
Restricted access - publisher's policyIn 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
(2013)
Conference report
Restricted access - publisher's policyIn 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
(2013-10-01)
Article
Restricted access - publisher's policyIn 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
(2012)
Conference lecture
Restricted access - publisher's policyIn 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)
(2010-01)
Article
Restricted access - publisher's policyIn 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
(2010-12)
Article
Open AccessIn 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
(Inge Troch, Felix Breitenecker, 2006-02)
Conference report
Open AccessWe 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"
(2011-05-01)
Article
Restricted access - publisher's policy -
Networking improves robustness in flexible-joint multi-robot systems with only joint position measurements
(2013-12)
Article
Restricted access - publisher's policyThis 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
(2012)
Conference report
Restricted access - publisher's policyDans 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 ...
