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  • Fixed frequency sliding mode-based robust inversion with a full-bridge current DC-link buck-boost

     Olm Miras, Josep Maria; Biel Sole, Domingo; Fossas Colet, Enric; Cardoner Parpal, Rafael
    Journal of the Franklin Institute
    Vol. 351, num. 1, p. 123-138
    DOI: 10.1016/j.jfranklin.2013.08.009
    Date of publication: 2014-01
    Journal article

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    The substitution of the original switches by a full bridge in a Non-Inverting Buck-Boost converter results in an inverter capable of carrying out step-down and step-up tasks as well under sliding mode control. The control law is implemented by means of the Zero Average Dynamics algorithm, which provides a fixed frequency operation and guarantees null error in each switching period, thus achieving a highly accurate tracking of periodic reference profiles. Furthermore, semi-infinite programming techniques are used to reduce power losses and, at the same time, prevent undesirable effects of control action saturation. The performance of the inverter is ensured to be robust in the face of bounded nonlinear and resistive loads. Realistic simulation results obtained with PSIMR software validate the proposed schemes.

  • Control avançat de sistemes d'energia

     Arias Pujol, Antoni; Batlle Arnau, Carles; Biel Sole, Domingo; Costa Castelló, Ramon; Doria Cerezo, Arnau; Fossas Colet, Enric; Franch Bullich, Jaime; Griño Cubero, Roberto; Husar, Attila Peter; Serra Prat, Maria; Cardoner Parpal, Rafael; Luna Pacho, Julio Alberto; Orellana Barcelo, Marcos; Repecho Del Corral, Victor; Strahl, Stephan; Olm Miras, Josep Maria
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  • Digital repetitive control under varying frequency conditions

     Ramos Fuentes, German A.; Costa Castelló, Ramon; Olm Miras, Josep Maria
    DOI: 10.1007/978-3-642-37778-5
    Date of publication: 2013
    Book

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    Experimental validation of the discrete-time MCS adaptive strategy  Open access

     di Bernardo, Mario; di Gaeta, Alessandro; Montanaro, Umberto; Olm Miras, Josep Maria; Santini, Stefania
    Control engineering practice
    Vol. 21, num. 6, p. 847-859
    DOI: 10.1016/j.conengprac.2012.12.004
    Date of publication: 2013-06
    Journal article

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    This paper is concerned with the implementation and experimental validation of a discrete-time model reference adaptive control strategy, known as Minimal Control Synthesis (MCS) algorithm. After discussing the proof of stability of the algorithm when applied to discretized models of continuous-timeplants, the problem of controlling a highly nonlinear electro-mechanical device is taken as a representative case of study. It is shown that the discrete-time MCS is an effective strategy to solve the problem while guaranteeing robustness to unmodeled nonlinear dynamics over a wide range of test manoeuvres

    This paper is concerned with the implementation and experimental validation of a discrete-time model reference adaptive control strategy, known as Minimal Control Synthesis(MCS)algorithm. After discussing the proof of stability of the algorithm when applied to discretized models of continuous-time plants, the problem of controlling a highly nonlinear electro-mechanical device is taken as a representative case of study. It is shown that the discrete-time MCS is an effective strategy to solve the problem while guaranteeing robustness to unmodeled nonlinear dynamics over a wide range of test manoeuvres

  • Bifurcation analysis of a Lyapunov-based controlled boost converter

     Spinetti Rivera, Mario de Jesús; Olm Miras, Josep Maria; Biel Sole, Domingo; Fossas Colet, Enric
    Communications in nonlinear science and numerical simulation
    Vol. 18, num. 11, p. 3108-3125
    DOI: 10.1016/j.cnsns.2013.03.018
    Date of publication: 2013-11
    Journal article

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    Lyapunov-based controlled boost converters have a unique equilibrium point, which is globally asymptotically stable, for known resistive loads. This article investigates the dynamic behaviors that appear in the system when the nominal load differs from the actual one and no action is taken by the controller to compensate for the mismatch. Exploiting the fact that the closed-loop system is, in fact, planar and quadratic, one may provide not only local but also global stability results: specifically, it is proved that the number of equilibria of the converter may grow up to three and that, in any case, the system trajectories are always bounded, i.e. it is a bounded quadratic system. The possible phase portraits of the closed-loop system are also characterized in terms of the selected bifurcation parameters, namely, the actual load value and the gain of the control law. Accordingly, the analysis allows the numerical illustration of many bifurcation phenomena that appear in bounded quadratic systems through a physical example borrowed from power electronics.

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    Existence of periodic solutions with nonconstant sign in a class of generalized abel equations  Open access

     Olm Miras, Josep Maria; Ros Oton, Xavier
    Discrete and continuous dynamical systems. Series A
    Vol. 33, num. 4, p. 1603-1614
    DOI: 10.3934/dcds.2013.33.1603
    Date of publication: 2013-04
    Journal article

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    This article provides sufficient conditions for the existence of periodic solutions with nonconstant sign in a family of polynomial, non-auto-nomous, firrst-order diferential equations that arise as a generalization of the Abel equation of the second kind.

  • Model reference adaptive control of a full-bridge buck inverter with minimal controller synthesis

     Salvi, Alessandro; Santini, Stefania; Biel Sole, Domingo; Olm Miras, Josep Maria; di Bernardo, Mario
    IEEE Conference on Decision and Control
    p. 3469-3474
    Presentation's date: 2013-12-11
    Presentation of work at congresses

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    The rejection of the undesirable effects of sudden load changes undergone by power inverters requires control techniques able to recover regular operation with a low transient error, in a short number of periods and being robust to unmodelled dynamics and parametric uncertainties. The possibilities are explored in this paper of controlling a fullbridge buck inverter via the discrete-time version of a model reference adaptive algorithm with minimal controller synthesis recently proposed by some of the authors. Besides confirming the theoretically predicted stability and robustness properties in the face of large load jumps, numerical results show that acceptable performance is still guaranteed when the control signal is injected through a PWM generator switching at a realistic frequency.

  • Analysis and design of a robust odd-harmonic repetitive controller for an active filter under variable network frequency

     Ramos, German A.; Costa Castelló, Ramon; Olm Miras, Josep Maria
    Control engineering practice
    Vol. 20, num. 9, p. 895-903
    DOI: 10.1016/j.conengprac.2012.05.009
    Date of publication: 2012-09
    Journal article

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    Frequencyvariationsintheelectricalnetworkmaycauseadramaticperformancedecayinrepetitive controlledactivefiltersintendedtoremoveodd-harmonicdistortioninsingle-phaseACloads.This work presentsanodd-harmonicrepetitivecontrollerforashuntactivepowerfilterthataddressessuch a performanceproblem.Thisisachievedbymeansofanadaptivechangeofthesamplingperiodofthe digitalcontroller.However,thisactionimpliesstructuralchangesthatmayresultinanoverall destabilizationoftheclosed-loopsystem.Hence,asmall-gaintheorem-basedrobustcontroldesign techniqueallowstoobtainacontrollerwhichassuresBIBOstabilityintherequiredsamplingperiod interval.Experimentalresultsvalidatetheproposal.

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    Harmonic balance-based control of a boost DC/AC converter  Open access

     Olm Miras, Josep Maria; Biel Sole, Domingo; Spinetti Rivera, Mario de Jesús; Fossas Colet, Enric
    International journal of circuit theory and applications
    Vol. 40, num. 8, p. 777-792
    DOI: 10.1002/cta.755
    Date of publication: 2012-08
    Journal article

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    The achievement of step-up inversion with a boost DC/AC converter requires appropriate periodic references for inductor currents, which have to satisfy ordinary differential equations (ODE) of the Abel type. These are equations with highly unstable solutions for which the existence of periodic solutions remains unproved. Hence, the studies reported so far in this subject obtain periodic output voltages that approximately track the expected profile using different periodic current references that do not exactly satisfy the Abel ODE. However, neither an explanation of why are periodic output voltages still obtained, nor an assessment of the output voltage error is provided. This paper analyzes the effect of using periodic current references in a Lyapunov-based controlled boost DC/AC converter performing step-up inversion tasks. It is shown that, for sufficiently accurate current references, the system exhibits asymptotically stable periodic solutions with bounded error. Moreover, the paper propounds the use of Harmonic Balance (HB)-based techniques to obtain such current references. Simulation and experimental results confirm that this choice yields periodic output voltages with an error that may be lowered using higher HB approximations.

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    An educational approach to the internal model principle for periodic signals  Open access

     Costa Castelló, Ramon; Olm Miras, Josep Maria; Vargas, Hector; Ramos, Germán Andres
    International journal of innovative computing information and control
    Vol. 8, num. 8, p. 5591-5606
    Date of publication: 2012-08
    Journal article

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    This article presents an educational approach to resonant control and repet- itive control, which are Internal Model Principle-based control techniques speci cally de- signed for the tracking/rejection of periodic signals. The analytical formulation is com- pleted by a set of simulations and physical experiments on a mechatronic educational plant integrated in a virtual/remote laboratory. The laboratory features are oriented to realize the limited performance of classic PID control to reject non-constant disturbances and, at the same time, to show the effectiveness of the Internal Model Principle for the rejection of periodic disturbances by means of resonators and repetitive control. Assess- ment based on students' perception reveals it as a useful distance learning tool. The laboratory is integrated in Automatl@bs, a Spanish interuniversity network of web-based laboratories devoted to distance learning of control engineering.

  • Control repetitivo digital de sistemas con frecuencia incierta o variante en el tiempo

     Costa Castelló, Ramon; Ramos Fuentes, German A.; Olm Miras, Josep Maria
    Revista iberoamericana de automática e informática industrial
    Vol. 9, num. 3, p. 219-230
    DOI: 10.1016/j.riai.2012.05.012
    Date of publication: 2012-07-01
    Journal article

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    El control repetitivo digital es una t´ecnica basada en el principio del modelo interno que permite seguir y/o rechazar se˜nales peri´odicas. Una hip´otesis clave en los dise˜nos tradicionales de control repetitivo es que la frecuencia de tales se˜nales es constante y conocida, siendo su principal desventaja la elevada degradaci´on de prestaciones que aparece cuando dicha frecuencia es incierta o var´ıa con el tiempo. En este trabajo se presenta una revisi´on de las principales estrategias introducidas hasta la fecha para resolver este problema.

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    Control Adaptativo por Modelo de Referencia con Síntesis de Controlador Mínima  Open access

     Olm Miras, Josep Maria
    Simposio CEA Ingeniería de Control
    p. 43-44
    Presentation's date: 2012-03-01
    Presentation of work at congresses

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    En este trabajo se revisa la técnica de control adaptativo por modelo de referencia con síntesis de controlador mínima y se relacionan las diferentes extensiones del método que se encuentran en la literatura especializada.

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    Digital repetitive control under non-uniform sampling: an LMI stability analysis  Open access

     Ramos Fuentes, German A.; Olm Miras, Josep Maria; Costa Castelló, Ramon
    Mathematical problems in engineering
    Vol. 2011, p. 1-16
    DOI: 10.1155/2011/120570
    Date of publication: 2011-07-01
    Journal article

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    Digital repetitive control is a technique which allows tracking periodic references and/or rejecting periodic disturbances. Repetitive controllers are usually designed assuming a fixed fundamental frequency for the signals to be tracked/rejected and its main drawback being a dramatic performance decay when this frequency varies. A usual approach to overcome the problem consists of an adaptive change of the sampling period according to the reference/disturbance period variation. This paper presents a stability analysis of a digital repetitive controller working under time-varying sampling period by means of an LMI gridding approach. Theoretical developments are illustrated with experimental results, which are preceded by a detailed description of fundamental issues related to the implementation procedure.

  • Stable inversion of Abel equations: Application to tracking control in DC-DC nonminimum phase boost converters

     Olm Miras, Josep Maria; Ros Oton, Xavier; Shtessel, Yuri
    Automatica
    Vol. 47, num. 1, p. 221-226
    DOI: 10.1016/j.automatica.2010.10.035
    Date of publication: 2011-01
    Journal article

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  • Stability analysis of digital repetitive control systems under time-varying sampling period

     Olm Miras, Josep Maria; Ramos, Germán Andres; Costa Castelló, Ramon
    IET control theory and applications
    Vol. 5, num. 1, p. 29-37
    DOI: 10.1049/iet-cta.2009.0308
    Date of publication: 2011-01
    Journal article

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  • Approximate tracking periodic references in a class of bilinear systems via stable inversion

     Olm Miras, Josep Maria; Ros Oton, Xavier
    Discrete and continuous dynamical systems. Series B
    Vol. 15, num. 1, p. 197-215
    DOI: 10.3934/dcdsb.2011.15.197
    Date of publication: 2011-01
    Journal article

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    Periodic solutions with nonconstant sign in Abel equations of the second kind  Open access

     Olm Miras, Josep Maria; Ros Oton, Xavier; Martinez-seara Alonso, Maria Teresa
    Journal of mathematical analysis and applications
    Vol. 381, num. 2, p. 582-589
    DOI: 10.1016/j.jmaa.2011.02.084
    Date of publication: 2011-09
    Journal article

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    The study of periodic solutions with constant sign in the Abel equation of the second kind can be made through the equation of the first kind. This is because the situation is equivalent under the transformation xmaps tox−1, and there are many results available in the literature for the first kind equation. However, the equivalence breaks down when one seeks for solutions with nonconstant sign. This note is devoted to periodic solutions with nonconstant sign in Abel equations of the second kind. Specifically, we obtain sufficient conditions to ensure the existence of a periodic solution that shares the zeros of the leading coefficient of the Abel equation. Uniqueness and stability features of such solutions are also studied.

  • Design and analysis strategies for digital repetitive control systems with time-varying reference/disturbance period

     Costa Castelló, Ramon; Olm Miras, Josep Maria; Ramos, Germán Andres
    International journal of control
    Vol. 84, num. 7, p. 1209-1222
    DOI: 10.1080/00207179.2010.496871
    Date of publication: 2011
    Journal article

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    A survey of repetitive control in varying frequency conditions  Open access

     Fuentes, G.A.R.; Olm Miras, Josep Maria; Costa Castelló, Ramon
    Ingeniería e investigación
    Vol. 31, num. 2, p. 29-37
    Date of publication: 2011-08
    Journal article

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    Digital repetitive control is a strategy that allows tracking/ rejecting periodic signals. Repetitive controllers are designed assuming that the exogenous signal period is constant and known, its main drawback being the dramatic loss of performance when signal frequency varies. This paper reviews the most relevant proposals advanced for overcoming this problem.El control repetitivo digital es una técnica que permite el seguimiento y rechazo de señales periódicas. Los controladores repetitivos son diseñados asumiendo que las señales a seguir/rechazar tienen una frecuencia fija y conocida, siendo su principal desventaja la degradación de desempeño cuando esta frecuencia varía. Este artículo presenta una revisión de las diferentes estrategias utilizadas con el fin de solventar dicha problemática.

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    Periodic solutions with nonconstant sign in Abel equations of the second kind  Open access

     Martinez-seara Alonso, Maria Teresa; Ros Oton, Xavier; Olm Miras, Josep Maria
    Date: 2011-02
    Report

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    The study of periodic solutions with constant sign in the Abel equation of the second kind can be made through the equation of the first kind. This is because the situation is equivalent under the transformation x 7¡æ x.1, and there are many results available in the literature for the first kind equation. However, the equivalence breaks down when one seeks for solutions with nonconstant sign. This note is devoted to periodic solutions with nonconstant sign in Abel equations of the second kind. Specifically, we obtain sufficient conditions to ensure the existence of a periodic solution that shares the zeros of the leading coefficient of the Abel equation. Uniqueness and stability features of such solutions are also studied

  • Técnicas de control avanzado para la mejora de la operación de convertidores vsi conectados a la red eléctrica

     Doria Cerezo, Arnau; Biel Sole, Domingo; Fossas Colet, Enric; Olm Miras, Josep Maria; Costa Castelló, Ramon; Orellana Barcelo, Marcos; Griño Cubero, Roberto
    Competitive project

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  • Repetitive control of an active filter under varying network frequency: power factor correction

     Ramos Fuentes, German A.; Olm Miras, Josep Maria; Costa Castelló, Ramon
    IEEE Latin American Conference on Automatic Control and Industry Applications
    p. 1-5
    DOI: 10.1109/LARC.2011.6086827
    Presentation's date: 2011-11-28
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  • A comparative study of repetitive control techniques for active power filters under network frequency variations

     Ramos Fuentes, German A.; Olm Miras, Josep Maria; Costa Castelló, Ramon
    Seminar for Advanced Industrial Control Applications
    p. 116-121
    Presentation's date: 2011-11-07
    Presentation of work at congresses

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  • Discrete-time MRAC with minimal controller synthesis of an electronic throttle body

     di Bernardo, Mario; di Gaeta, Alessandro; Montanaro, Umberto; Olm Miras, Josep Maria; Santini, Stefania
    World Congress of the International Federation of Automatic Control
    p. 5064-5069
    DOI: 10.3182/20110828-6-IT-1002.01052
    Presentation's date: 2011-08-31
    Presentation of work at congresses

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  • Best Presentation in Session Award (ACC2010, WeeC05)

     Costa Castelló, Ramon; Olm Miras, Josep Maria; Ramos Fuentes, German A.; Cardoner Parpal, Rafael
    Award or recognition

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  • Adaptive compensation strategy for the tracking/rejection of signals with time-varying frequency in digital repetitive control systems

     Olm Miras, Josep Maria; Ramos, German A.; Costa Castelló, Ramon
    Journal of process control
    Vol. 20, num. 4, p. 551-558
    DOI: 10.1016/j.jprocont.2010.02.002
    Date of publication: 2010-04
    Journal article

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    Linear robust output regulation in a class of switched power converters  Open access

     Olm Miras, Josep Maria; Biel Sole, Domingo
    Mathematical problems in engineering
    Vol. 2010, p. 1-22
    DOI: 10.1155/2010/724531
    Date of publication: 2010-07-15
    Journal article

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    This article addresses the robust output regulation problem for a class of nonlinear switched power converters after its linearization by means of a change of the control vector variable. The methodology employs a dynamic state feedback control law and considers parametric uncertainty due to unknown values of resistive loads. Restrictions arising from the fact that the control gains exhibit fixed values are taken into account. The proposed technique is exemplified with the output voltage regulation of a Noninverting Buck-Boost converter and tested through realistic numerical simulations.

  • Discrete-time minimal control synthesis adaptive algorithm

     di Bernardo, Mario; di Gennaro, F.; Olm Miras, Josep Maria; Santini, Stefania
    International journal of control
    Vol. 83, num. 12, p. 2641-2657
    DOI: 10.1080/00207179.2010.536916
    Date of publication: 2010-12-12
    Journal article

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  • Propulsor híbrido para vehículo urbano liviano

     Roqueiro, Nestor; Muñoz Aguilar, Raul Santiago; Griño Cubero, Roberto; Fossas Colet, Enric; Doria Cerezo, Arnau; Batlle Arnau, Carles; Riera Colomer, Jordi; Olm Miras, Josep Maria; Pagano, Daniel Juan; Valencia da Luz, Mauricio; Oliveira, Amir; Nicolazzi, Lauro; de Souza Vieira, Rodrigo; Gaudenzi Faria, Marcelo; de Lima, Sigmar; de Souza Campos, David
    Competitive project

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  • Odd-harmonic repetitive control of an active filter under varying network frequency: practical considerations

     Costa Castelló, Ramon; Olm Miras, Josep Maria; Ramos, Germán Andres; Cardoner Parpal, Rafael
    2010 IEEE Multi-Conference on Systems and Control
    p. 398-403
    DOI: 10.1109/CCA.2010.5611211
    Presentation's date: 2010-09-08
    Presentation of work at congresses

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    This work deals with the design and analysis of a controller for a shunt active power filter. The design is based on combined feedforward and feedback actions, the last using oddharmonic repetitive control, and aims at obtaining good closedloop performance in spite of the possible frequency variations that may occur in the electrical network. As these changes affect the performance of the controller, the proposal includes a compensation technique consisting of an adaptive change of the sampling time of the digital controller according to the network frequency variation. However, this implies structural changes in the closed-loop system that may eventually destabilize it. Hence, this article is also concerned with closed-loop stability of the resulting system, which is analyzed using a robust control approach that takes advantage of the small gain theorem. Experimental results reporting good performance of the closedloop system are provided.

  • Second-order odd-harmonic repetitive control and its application to active filter control

     Costa Castelló, Ramon; Ramos, Germán Andres; Olm Miras, Josep Maria; Steinbuch, Maarten
    IEEE Conference on Decision and Control
    p. 6967-6972
    Presentation's date: 2010-12-15
    Presentation of work at congresses

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  • Odd-harmonic repetitive control of an active filter under varying network frequency: a small-gain theorem-based stability analysis  awarded activity

     Olm Miras, Josep Maria; Ramos Fuentes, German A.; Costa Castelló, Ramon; Cardoner Parpal, Rafael
    American Control Conference
    p. 1749-1754
    Presentation's date: 2010-06-30
    Presentation of work at congresses

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    This work deals with the design and analysis of a controller for a shunt active power filter. The design is based on combined feedforward and feedback actions, the last using repetitive control, and aims at the obtention of a good closedloop performance in spite of the possible frequency variations that may occur in the electrical network. As these changes affect the performance of the controller, the proposal includes a compensation technique consisting of an adaptive change of the digital controller’s sampling time according to the network frequency variation. However, this implies structural changes in the closed-loop system that may destabilize the overall system. Hence, this article is also concerned with closed-loop stability of the resulting system, which is analyzed using a robust control approach through the small gain theorem. Experimental results that indicate good performance of the closed-loop system are provided.

    Best Presentation in Session Award, que atorga la 2010 American Control Conference

  • Anti-windup schemes comparison for digital repetitive control

     Ramos, Germán Andres; Costa Castelló, Ramon; Olm Miras, Josep Maria
    IEEE International Conference on Emerging Technologies and Factory Automation
    DOI: 10.1109/ETFA.2010.5641241
    Presentation's date: 2010-09-13
    Presentation of work at congresses

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    Robust high-order repetitive control of an active filter using an odd-harmonic internal model  Open access

     Ramos Fuentes, German A.; Costa Castelló, Ramon; Olm Miras, Josep Maria; Cardoner Parpal, Rafael
    Annual Conference of the IEEE Industrial Electronics Society
    p. 1040-1045
    Presentation's date: 2010-07-07
    Presentation of work at congresses

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    Shunt active power filters have proven to be an efficient means to compensate for the negative effects of nonlinear and reactive loads on the power quality of the electrical distribution network. In this context, the control objective is to achieve a power factor close to 1, as well as load current harmonics and reactive power compensation. A useful control strategy for this purpose is repetitive control. However, the performance of repetitive controllers is strongly affected by frequency variations of the involved signals. This work analyzes the effect of such variations and describes the architecture of an odd-harmonic, high-order repetitive controller specifically designed to obtain robust closed-loop performance against frequency variations that may occur in the electrical network.

  • Asian journal of control

     Olm Miras, Josep Maria
    Collaboration in journals

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  • A functional iterative approach to the tracking control of nonminimum phase switched power converters

     Fossas Colet, Enric; Olm Miras, Josep Maria
    Mathematics of control signals and systems
    Vol. 21, num. 3, p. 203-227
    DOI: 10.1007/s00498-009-0044-5
    Date of publication: 2009-12
    Journal article

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  • Análisis de estabilidad de controladores repetitivos con periodo de muestreo variable mediante técnicas de control robusto

     Olm Miras, Josep Maria; Germán, A Ramos; Costa Castelló, Ramon
    Jornadas de Automática
    p. 1-6
    Presentation of work at congresses

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    Stable inversion-based robust tracking control in DC-DC nonlinear switched converters  Open access

     Olm Miras, Josep Maria; Ros Oton, Xavier; Shtessel, Yuri
    IEEE Conference on Decision and Control
    p. 2789-2794
    Presentation's date: 2009-12-16
    Presentation of work at congresses

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    This article studies the robust tracking control problem in nonminimum phase DC-DC nonlinear switched power converters. The proposed procedure introduces a stable inversion-based iterative technique that, taking advantage of Banach’s fixed point theorem, provides closed-form analytic expressions uniformly convergent to the exact solution of the corresponding inverse problem. Then, piecewise constant load disturbances belonging to an a priori known compact set are successfully rejected by means of dynamic compensation. Simulation results validate the proposal.

  • Design and Analysis Strategies for Digital Repetitive Control Systems with Time-Varying Reference/Disturbance Period

     Costa Castelló, Ramon; Olm Miras, Josep Maria; Ramos, German A.
    IEEE Conference on Decision and Control and Chinese Control Conference. Symposium on Learning Control
    p. 1-6
    Presentation's date: 2009-12-14
    Presentation of work at congresses

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    Adaptive compensation strategy for the tracking/rejection of signals with time-varying frequency in digital repetitive control systems  Open access

     Ramos, German A.; Olm Miras, Josep Maria; Costa Castelló, Ramon
    IEEE International Conference on Emerging Technologies and Factory Automation
    p. 1-7
    DOI: 10.1109/ETFA.2009.5347047
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    Digital repetitive control is a technique which al- lows to track periodic references and/or reject peri- odic disturbances. Repetitive controllers are usually de- signed assuming a fixed frequency for the signals to be tracked/rejected, its main drawback being a dramatic per- formance decay when this frequency varies. A usual ap- proach to overcome the problem consists of an adap- tive change of the sampling time according to the refer- ence/disturbance period variation. However, this sam- pling period adaptation implies parametric changes af- fecting the closed-loop system behavior, that may compro- mise the system stability. This article presents a design strategy which allows to compensate for the parametric changes caused by sampling period adjustment. Stabil- ity of the digital repetitive controller working under time- varying sampling period is analyzed. Theoretical devel- opments are illustrated with experimental results.

  • Digital repetitive control under time-varying sampling period: an LMI stability Analysis

     Olm Miras, Josep Maria; Costa Castelló, Ramon; Germán, A Ramos
    3rd IEEE Multi-conference on Systems and Control (MSC 2009). Conference on Control Applications (CCA'09)
    p. 782-787
    Presentation of work at congresses

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  • ACES CONTROL AVANÇAT DE SISTEMES D'ENERGIA

     Serra Prat, Maria; Franch Bullich, Jaime; Costa Castelló, Ramon; Batlle Arnau, Carles; Doria Cerezo, Arnau; Griño Cubero, Roberto; Biel Sole, Domingo; Riera Colomer, Jordi; Olm Miras, Josep Maria; Sarmiento Carnevali, Maria Laura; Fossas Colet, Enric
    Competitive project

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  • Iterative approximation of limit cycles for a class of Abel equations

     Fossas Colet, Enric; Olm Miras, Josep Maria; Sira Ramírez, Hebertt J.
    Physica. D, Nonlinear phenomena
    Vol. 237, num. 23, p. 3159-3164
    Date of publication: 2008-12
    Journal article

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  • Análisis de estabilidad de un sistema de control repetitivo digital con periodo de muestreo variable

     Olm Miras, Josep Maria; Costa Castelló, Ramon; Germán, A Ramos
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 1-6
    Presentation of work at congresses

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  • Iterative approximation of unstable limit cycles for a class of Abel equations

     Fossas Colet, Enric; Olm Miras, Josep Maria; Sira Ramírez, Hebertt J.
    Date: 2007-11
    Report

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  • Control digital avanzado para el seguimiento de señales periódicas. Aplicación a convertidores electrónicos de potencia.

     Olm Miras, Josep Maria; Griño Cubero, Roberto; Costa Castelló, Ramon; Doria Cerezo, Arnau; Fossas Colet, Enric
    Competitive project

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  • Galerkin-based sliding mode tracking control of non-minimum phase DC-to-DC power converters

     Fossas Colet, Enric; Olm Miras, Josep Maria; Zinober, A; Shtessel, Y
    International journal of robust and nonlinear control
    Vol. 17, num. 7, p. 587-604
    Date of publication: 2007-05
    Journal article

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  • Galerkin method and approximate tracking in a non-minimum phase bilinear system

     Fossas Colet, Enric; Olm Miras, Josep Maria
    Discrete and continuous dynamical systems. Series B
    Vol. 7, num. 1, p. 53-76
    Date of publication: 2007-01
    Journal article

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  • Sliding motion, robust control and power loss minimization in a class of non-linear switched converters

     Olm Miras, Josep Maria; Biel Sole, Domingo; Fossas Colet, Enric; Zinober, A; Sanz, L
    International journal of control
    Vol. 80, num. 6, p. 968-981
    Date of publication: 2007-06
    Journal article

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  • Robust step-up DC/AC conversion with a full bridge non-inverting buck-boost converter

     Biel Sole, Domingo; Fossas Colet, Enric; Olm Miras, Josep Maria
    16th IEEE International Conference on Control Applications
    p. 593-599
    Presentation of work at congresses

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