Now showing items 1-20 of 87

    • 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 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 ...
    • 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 relay controller with parallel feed-forward compensation for a buck converter feeding constant power loads 

      Rafiezadeh, Roya; Griñó Cubero, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Open Access
      A simple and efficient analog direct voltage control design for improving the performance and stability of a buck converter feeding constant power loads (CPLs) is the main aim of this article. One of the oldest and most ...
    • 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, ...
    • 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)
      Conference report
      Open Access
      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)
      Conference lecture
      Open Access
      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 ...
    • Active damping: an Hinf model reference approach 

      Pérez, Jorge; Cóbreces Álvarez, Santiago; Griñó Cubero, Robert; Huerta, Francisco; Rodríguez, Francisco Javier (Institute of Electrical and Electronics Engineers (IEEE), 2018-08-01)
      Article
      Open Access
      This paper focuses on the design of an active-damping controller that shapes the dynamics of an LCL grid connected voltage source converter (VSC) to mimic an L-filter connected VSC. This makes possible to use simpler ...
    • Adaptive control-based voltage regulation of a magnetically coupled multiport DC-DC converter for electrified vehicles applications 

      Holm Nielsen, Jens Bo; Fossas Colet, Enric; Repecho del Corral, Víctor; Dòria Cerezo, Arnau; Griñó Cubero, Robert (2020)
      Conference report
      Open Access
      This paper presents an adaptive control-based strategy to regulate the output voltage of a a magnetically coupled multiport dc-dc converter aimed at automotive applications. The proposed algorithm renders robustness to ...
    • 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 ...
    • 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 ...
    • Comprehensive high speed automotive SM-PMSM torque control stability analysis including novel control approach 

      Arias Pujol, Antoni; Ibarra Basabe, Edorta; Trancho, Elena; Griñó Cubero, Robert; Kortabarria, Iñigo; Caum Aregay, Jesús (2019-07-01)
      Article
      Open Access
      Permanent magnet synchronous machines (PMSM) are widely used in the automotive industry for electric vehicle (EV) and hybrid electric vehicle (HEV) propulsion systems, where the trend is to achieve high mechanical speeds. ...
    • Conceptes i eines matemàtiques en automàtica 

      Griñó Cubero, Robert (2019-05-22)
      Audiovisual
      Open Access
    • 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. ...