Now showing items 1-20 of 71

  • 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 ...
  • Adaptive neural network state predictor and tracking control for nonlinear time-delay systems 

    Na, Jing; Ren, Xuemei; Gao, Yan; Griñó Cubero, Robert; Costa Castelló, Ramon (2010-02)
    Article
    Restricted access - publisher's policy
    A new adaptive nonlinear state predictor (ANSP) is presented for a class of unknown nonlinear systems with input time-delay. A dynamical identification with neu- ral network (NN) is constructed to obtain NN weights and ...
  • Admittance-shaped Hinf current controller for grid-connected VSC 

    Perez Morales, Jorge; Cóbreces Álvarez, Santiago; Griñó Cubero, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    This paper introduces an H8 current controller that allows the shaping of power converters’ input admittance in frequency domain, allowing to define not only its magnitude but also its phase. In addition to admittance ...
  • 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 local stability condition for dc grids with constant power loads 

    Arocas Pérez, José; Griñó Cubero, Robert (2017-07-01)
    Article
    Open Access
    Currently, there are an increasing number of power electronics converters in electrical grids, performing the most diverse tasks, but most of them, work as constant power loads (CPLs). This work presents a sufficient ...
  • Análisis y diseño de controladores lineales para el convertidos elevador ("boost") bidireccional en corriente 

    Malo Barragán, Shane Leonardo; Griñó Cubero, Robert (2005-07)
    External research report
    Open Access
    Los convertidores de voltaje DC-DC juegan dentro de la tecnología actual un papel fundamental, actúan como puentes de transferencia de energía entre fuentes y cargas, ambas de corriente continua, que no son compatibles por ...
  • A new passive repetitive controller for discrete-time finite-frequency positive-real systems 

    Costa Castelló, Ramon; Wang, Danwei; Griñó Cubero, Robert (IEEE Control Systems Society, 2007)
    Conference report
    Open Access
    This work proposes a new repetitive controller for discrete-time finite-frequency positive-real systems which are required to track periodic references or to attenuate periodic disturbances. The main characteristic of the ...
  • A passive repetitive controller for discrete-time finite-frequency positive-real systems 

    Costa Castelló, Ramon; Wang, Danwei; Griñó Cubero, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2009-04)
    Article
    Open Access
    This work proposes and studies a new internal model for discrete-time passive or finite-frequency positive-real systems which can be used in repetitive control designs to track or to attenuate periodic signals. The main ...
  • A repetitive controller for discrete-time passive systems 

    Costa Castelló, Ramon; Griñó Cubero, Robert (2006-10-23T14:07:36Z)
    External research report
    Open Access
    This work proposes and studies a new repetitive controller for discrete-time systems which are required to track or to attenuate periodic signals. The main characteristic of the proposed controller is its passivity. This ...
  • A robust grid current controller with grid harmonic and filter resonance damping capabilities using a closed-loop admittance shaping 

    Perez Morales, Jorge; Cóbreces Álvarez, Santiago; Wang, Xiongfei; Blaabjerg, Frede; Griñó Cubero, Robert (IEEE Press, 2017)
    Conference report
    Open Access
    This paper presents a grid current control of a grid connected Voltage Source Converter (VSC) with an LCL filter. The control method enables to shape the input admittance of the converter in addition to track a given current ...
  • A transient model for RF cavity analysis under beam loading 

    Hassanzadegan, Hooman; Griñó Cubero, Robert (2010-04)
    Article
    Restricted access - publisher's policy
    There are two important considerations in the development of an electrical model for RF cavities to be used for system analysis or LLRF loop design, being: transient response and cavity impedance mismatch. In the literature, ...
  • 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. ...
  • Contribución a la identificación de sistemas dinámicos mediate métodos conexionistas 

    Griñó Cubero, Robert (Universitat Politècnica de Catalunya, 1997-10-24)
    Doctoral thesis
    Open Access
    El presente trabajo de tesis doctoral propone una clase de modelos, con estructura de red neuronal con dinámica aditiva evolucionando en tiempo continuo, para la identificación de sistemas dinámicos.<br/><br/>Para la clase ...
  • Control digital basado en AFC de un rectificador trifásico PWM 

    Orellana Barceló, Marcos; Griñó Cubero, Robert (2013)
    Conference report
    Open Access
    La operación de los convertidores de potencia conectados a la red eléctrica está sometida cada vez a más condicionantes (reducción de armónicos, funcionamiento en presencia de sags y swells, altas impedancias de red, etc.). ...
  • DAE Methods in Constrained Robotic System Simulation: 

    Costa Castelló, Ramon; Griñó Cubero, Robert; Basañez Villaluenga, Luis (Centro de Investigación en Computación, 1998-03)
    Article
    Open Access
    In this paper a DAE formulation is used to model the behaviour of constrained robotic systems. This formulation allows to specify in an easy and clear way the constrained behaviour of a robotic system. In order to better ...
  • Decoupled DC-Link capacitor voltage control of DC-AC multilevel multileg converters 

    Busquets Monge, Sergio; Griñó Cubero, Robert; Nicolás Apruzzese, Joan; Bordonau Farrerons, José (Institute of Electrical and Electronics Engineers (IEEE), 2015-10-27)
    Article
    Open Access
    This paper studies the coupling between the capacitor voltage control loops of diode-clamped (or functionally equivalent) multilevel multileg (multiphase) dc-ac converters. From a complete model of the plant revealing the ...
  • Demonstration of the Internal Model Principle by Digital 

    Costa Castelló, Ramon; Nebot, Jordi; Griñó Cubero, Robert (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-02)
    Article
    Open Access
    A key topic in classical control theory is the Internal Model Principle (IMP). A particular case of the IMP for tracking periodic references or attenuating periodic disturbances in closed-loop control systems is a technique ...
  • Design of discrete-time finite-gain resonators in AFC control 

    Orellana Barceló, Marcos; Griñó Cubero, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    The control technique based on infinite-gain resonators also called Adaptive Feedforward Cancellation (AFC) has been used for some years, mainly in continuous time. In this article, finite-gain resonators in discrete time ...
  • Digital AFC control of a three-phase three-wire unity-power-factor PWM rectifier 

    Orellana Barceló, Marcos; Griñó Cubero, Robert (IEEE, 2013)
    Conference report
    Restricted access - publisher's policy
    Nowadays, ac/dc power converters must fulfill more and more design constraints with respect to the electrical grid: harmonics reduction, operation with sags and swells and/or high grid impedances, etc. This is a challenge ...