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  • 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
    Competitive project

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  • 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.

  • 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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    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.

  • 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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  • 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
    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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    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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  • 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: 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.

  • 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.

  • 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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  • 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

  • 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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    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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  • 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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  • 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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  • Asian journal of control

     Olm Miras, Josep Maria
    Collaboration in journals

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  • 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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    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
    Presentation of work at congresses

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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.

  • 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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  • 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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  • Nonminimum phase output tracking control strategies for DC-to-DC power converters

     Fossas Colet, Enric; Olm Miras, Josep Maria; Zinober, A; Shtessel, Y; Patterson, J
    Date of publication: 2006-05
    Book chapter

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  • Sliding control and optimization in a full bridge boost converter

     Sanz, L; Zinober, A; Biel Sole, Domingo; Fossas Colet, Enric; Olm Miras, Josep Maria
    CTS-HYCON Workshop on Nonlinear and Hybrid Control
    p. 673-678
    Presentation of work at congresses

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  • Sliding control and optimization in a full bridge boost converter

     Sanz, L M; Zinober, A; Biel Sole, Domingo; Fossas Colet, Enric; Olm Miras, Josep Maria
    CTS-HYCON Workshop on Nonlinear and Hybrid Control
    p. 673-678
    Presentation of work at congresses

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  • Reconocimiento y financiación del grupo Control Avanzado de Sistemas

     Fossas Colet, Enric; Griño Cubero, Roberto; Batlle Arnau, Carles; Olm Miras, Josep Maria; Doria Cerezo, Arnau
    Competitive project

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  • Sliding motion and direct control of the output voltage in a full bridge boost converter

     Fossas Colet, Enric; Olm Miras, Josep Maria; Zinober, A
    European Control Conference
    p. 4760-4765
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  • Diseño y control del sistema de acondicionamiento de energía eléctrica para pilas de combustible.

     Malo Barragan, Shane Leonardo; Griño Cubero, Roberto; Olm Miras, Josep Maria; Costa Castelló, Ramon; Doria Cerezo, Arnau; Fossas Colet, Enric; Batlle Arnau, Carles
    Competitive project

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  • Asymptotic Tracking with DC-to-DC Bilinear Power Converters  Open access

     Olm Miras, Josep Maria
    Institute of Industrial and Control Engineering (IOC), Universitat Politècnica de Catalunya
    Theses

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    Avui en dia la conversió DC-AC té una important aplicació pràctica en el camp dels sistemes de potència ininterrompuda (SPI). Els convertidors commutats bàsics (el buck, lineal, i el boost i el buck-boost, no lineals) presenten una estructura molt simple, i al llarg dels últims quinze anys s'ha estudiat la possibilitat d'usar-los en esquemes de conversió DC-AC. L'objectiu de la tesi és aconseguir que els convertidors DC-DC de potència bàsics puguin seguir referències alternes mitjançant el voltatge de sortida. També es desenvolupen esquemes robustos per tal d'eliminar l'efecte de possibles pertorbacions en la tasca de seguiment. Els modes de lliscament s'usen com a tècnica de control, i es presenten resultats de simulació.La tesi s'organitza en capítols. El primer i el segon contenen una introducció i una revisió de la literatura existent. Els continguts i distribució de la resta de capítols segueix a continuació. El capítol 3 tracta el seguiment exacte i asimptòtic d'una referència variable en el temps per part del voltatge de sortida d'un convertidor reductor, controlat indirectament via el corrent d'entrada. A partir de l'estudi del problema del seguiment en sistemes lineals amb guanys fixos -mitjançant la teoria de mòduls- s'obtenen restriccions sobre els possibles senyals a seguir. A més, es proporciona una estratègia de control lliscant per aconseguir el seguiment, consistent en un procediment per modificar una superfície de lliscament inicialment bona en tasques de regulació i una llei de control. Una adequada elecció de variables d'estat permet que les possibles pertorbacions de la resistència de càrrega satisfacin la condició de superposició. En el capítol 4 s'usa un procediment basat en inversió per aconseguir el seguiment exacte de referències periòdiques amb la resistència de càrrega dels convertidors no lineals boost i buck-boost. També s'obtenen condicions suficients per a possibles senyals a seguir. Es presenta també un marc general per a un tractament via inversió del problema de seguiment exacte en una certa classe de sistemes bilineals de segon ordre: aquells en els quals el problema d'inversió dóna lloc a una EDO del tipus Abel. El capítol 5 estudia l'ús del mètode de Galerkin -una generalització del mètode del Balanç Harmònic- en la solució aproximada del problema invers aparegut al capítol anterior, així com l'efecte que té la seva utilització en el control del sistema. Es demostra l'existència d'una successió de solucions aproximades de l'EDO que representa l'esmentat problema invers. També es prova que aquesta successió convergeix uniformement cap a la solució periòdica de l'EDO, i s'obté una cota d'error. La sortida del sistema presenta un comportament periòdic i asimptòticament estable quan es fa anar la successió d'aproximacions de Galerkin en el control del sistema. A l'hora, la successió de sortides periòdiques presenta convergència uniforme cap a la funció desitjada sota una hipòtesi raonable. També s'obtenen en aquest cas cotes d'error. En el capítol 6 s'aconsegueix seguiment asimptòtic aproximat per a convertidors no lineals bàsics que presenten pertorbacions de càrrega. Això es fa mitjançant un control adaptatiu que estima el paràmetre pertorbat i una aproximació de Galerkin de primer ordre que incorpora l'actualització on-line a una superfície de lliscament apropiada. El capítol 7 proposa exercir un control directe del voltatge de sortida en convertidors boost i buck-boost bidireccionals, tot aprofitant la robustesa davant pertorbacions externes que ofereix aquest tipus de control. Es segueixen referències periòdiques mentre el voltatge de sortida es regula independentment a un nivell prefixat.

    Nowadays, DC-to-AC conversion has an important practical application in the field of uninterruptible power systems (UPS). Basic DC-to-DC switch mode power converters (the buck, which is linear, and the boost and buck-boost, which are nonlinears) possess a very simple structure, and during the last fifteen years the possibility of using them in DC-to-AC conversion schemes has been studied. The aim of this thesis is to achieve that the output voltage of the DC-to-DC buck, boost and buck-boost power converters can track periodic references. Robust schemes to eliminate disturbance effects in the tracking task are also developed. Sliding modes are used as the control technique, and the obtained results are validated by numeric simulation.The thesis is organized in chapters. The first and the second one contain an introduction and a review of the existing literature. The contents and contributions of the other chapters follow below. Chapter 3 deals with the exact and asymptotic tracking of a time varying reference by the load voltage of a step-down converter, indirectly controlled through the input current. Departing from the study of the tracking problem in linear systems with fixed gains with the aid of module theory, conditions over possible reference signals have been obtained. Moreover, a sliding mode strategy to achieve the control target, consisting in a procedure to modify a switching surface initially good for regulation tasks and a control law, is provided. An approppriate choice of state variables allows possible load perturbations to satisfy the matching condition. In chapter 4, an inversion-based indirect control is used to reach exact tracking of periodic references with the load resistance of nonminimum phase, nonlinear boost and buck-boost converters. Sufficient conditions for candidate references are also obtained. A general frame for an inversion-based treatment of the perfect tracking problem in a certain class of nonminimum phase, second order bilinear systems is proposed: those in which the inversion problem gives raise to an ODE of the Abel type. Chapter 5 studies the use of the Galerkin method -a generalization of the Harmonic Balance method- in the approximate solution of the inverse problem stated in the former chapter, as well as the effect of its use on the control of the system. The existence of a sequence of approximate solutions for the ODE that represents the quoted inverse problem is proved. This sequence is also proved to converge uniformly to the periodic solution of the ODE, and an error bound has been derived. The system output exhibits a periodic and asymptotically stable behavior when the indirect control using the sequence of Galerkin approximations is performed. In turn, the sequence of periodic outputs is shown to exhibit uniform convergence to the original target function under a reasonable hypothesis. Error bounds have also been obtained. In chapter 6, approximate asymptotic tracking is achieved for load perturbed, basic, nonlinear power converters. This is done by means of an adaptive control that estimates the perturbation parameter and a first order Galerkin approximation that incorporates the on-line updating into an appropriate sliding surface. Chapter 7 propounds to exert a direct control of the output voltage in bidirectional boost and buck-boost converters, thus taking advantage of the insensitiveness to external disturbances offered by this type of control. Periodic references are followed, while the unstable inductor current is independently regulated at a prescribed level.

  • Seguiment asimptòtic amb convertidors DC-DC bilineals

     Fossas Colet, Enric; Olm Miras, Josep Maria
    Jornada de Recerca en Automàtica, Visió i Robòtica
    p. 155-162
    Presentation's date: 2004-02
    Presentation of work at congresses

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  • Robust tracking control of DC-to-DC nonlinear power converters

     Fossas Colet, Enric; Olm Miras, Josep Maria; Zinober, A
    IEEE Conference on Decision and Control
    p. 5291-5296
    Presentation of work at congresses

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  • Seguiment asimptòtic amb convertidors DC-DC

     Fossas Colet, Enric; Olm Miras, Josep Maria
    Jornada de Recerca en Automàtica, Visió i Robòtica
    p. 155-162
    Presentation of work at congresses

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  • A sliding approach to tracking problems in DC-DC power converters

     Olm Miras, Josep Maria; Fossas Colet, Enric; Biel Sole, Domingo
    International Conference on Decision and Control CDC ' 96
    p. 4008-4009
    Presentation of work at congresses

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  • Diseño y Realización de Controladores No Lineales para Convertidores Conmutados (TAP94-0552-C03-03)

     Poveda Lopez, Alberto; Martinez Salamero, Luis; Pique Lopez, Robert; Olm Miras, Josep Maria
    Competitive project

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  • TAP94-0552-C03-02 TECNICAS GEOMETRICAS APLICADAS AL CONTROL NO LINEAL DE SISTEMAS DINAMICOS

     Olm Miras, Josep Maria; Fossas Colet, Enric
    Competitive project

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  • Tracking signals in basic converters: a sliding approach

     Fossas Colet, Enric; Olm Miras, Josep Maria
    Workshop on Variable Structures and Lyapunov Techniques
    p. 342-348
    Presentation of work at congresses

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  • Sobre la generación de señales en un convertidor reductor mediante control deslizante

     Olm Miras, Josep Maria
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 321-324
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  • Generation of signals in a buck converter with sliding mode control

     Fossas Colet, Enric; Olm Miras, Josep Maria
    IEEE International Symposium on Circuits and Systems
    p. 157-161
    Presentation of work at congresses

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  • Asymptotic tracking in DC-to-DC nonlinear power converters

     Fossas Colet, Enric; Olm Miras, Josep Maria
    Discrete and continuous dynamical systems. Series B
    Vol. 2, num. 2, p. 295-307
    Date of publication: 2002-05
    Journal article

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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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  • 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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  • Nonminimum phase output tracking strategies for DC-to-DC power converters

     Zinober, A; Shtessel, Y; Fossas Colet, Enric; Olm Miras, Josep Maria; Patterson, J
    Lecture notes in control and information sciences
    num. 334, p. 447-482
    Date of publication: 2006-01
    Journal article

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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.