Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 284 results
  • Maximum power point tracking based on slidingmode control for output-series connected converters in photovoltaic systems

     Cabal, Cédric; Martínez Salamero, Luis; Séguier, Lionel; Alonso, Corinne; Guinjoan Gispert, Francisco
    IET power electronics
    Vol. 7, num. 4, p. 914-923
    DOI: 10.1049/iet-pel.2013.0348
    Date of publication: 2014-04-01
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    A perturb and observe algorithm based on both the power-current characteristic of a photovoltaic (PV) panel and the sliding-mode control of the input inductor current of an associated converter is investigated in a static application. A single ended primary inductance converter (SEPIC) converter charging a battery from a PV generator illustrates the procedure whose effectiveness is proved with experimental results. The reported technique is appropriate for distributed maximum power point tracking of PV systems with output series connected DC-DC switching converters. In these systems, each converter is supplied by an independent PV panel at the input port whereas its output port is connected in series with the output ports of the other converters. The proposed converter interconnection is based on a transformer-less SEPIC because of the capability of this converter to step-up or step-down the input voltage. The resulting system allows maximum power extraction from each PV source even in cases of non-uniform irradiance. © The Institution of Engineering and Technology 2014.

  • Global MPPT scheme for photovoltaic string inverters based on restricted voltage window search algorithm

     Boztepe, Mutlu; Guinjoan Gispert, Francisco; Velasco Quesada, Guillermo; Silvestre Berges, Santiago; Chouder, Aissa; Karatepe, Engin
    IEEE transactions on industrial electronics
    Vol. 61, num. 7, p. 3302-3312
    DOI: 10.1109/TIE.2013.2281163
    Date of publication: 2014-07-01
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    String inverter photovoltaic (PV) systems with bypass diodes require improved global maximum power point tracking (GMPPT) algorithms to effectively reach the absolute maximum power operating point. Several GMPPT algorithms have been proposed to deal with this problem, but most of them require scanning wide voltage ranges of the PV array from nearly zero voltage to open-circuit voltage that increases the scanning time and, in turn, causes energy loss. This paper presents a novel GMPPT method which significantly restricts the voltage window search range and tracks the global power peak rapidly in all shading conditions. Simulation tests and experimental comparisons with another GMPPT algorithm are presented to highlight the features of the presented approach.

  • Access to the full text
    Gestión de energía en sistemas híbridos Red-PV-diesel en el proyecto MED-Solar  Open access

     Velasco Quesada, Guillermo; Casellas Beneyto, Francisco; Guinjoan Gispert, Francisco; Pique Lopez, Robert; Martínez García, Herminio; Pineau, A.; Graillot, A.
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 3010.1-3010.6
    Presentation's date: 2014-06-26
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    El presente trabajo aborda el diseño de la estructura de un sistema de gestión de energía eléctrica aplicable a sistemas eléctricos híbridos formados por la red eléctrica y sistemas de generación fotovoltaica, generación diésel y almacenamiento. La implementación de estos sistemas híbridos y sus sistemas de gestión será, dentro del marco del Proyecto MED-Solar, en tres países del área del Máshrek (Líbano, Palestina y Jordania), con el fin de demostrar que este tipo de instalaciones puede reducir parte de la problemática energética presente en estos países y, por tanto, mostrarse atractiva para diversos sectores económicos.

  • Banco de pruebas para verificar el rendimiento estático y dinámico del MPPT

     Velasco Quesada, Guillermo; Casellas Beneyto, Francisco; Guinjoan Gispert, Francisco; Pique Lopez, Robert
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 3016.1-3016.6
    DOI: -
    Presentation's date: 2014-06-26
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Simulación mediante ¿hardware in the loop¿ de un convertidor buck

     Velasco Quesada, Guillermo; Casellas Beneyto, Francisco; Guinjoan Gispert, Francisco; Esteban, Jordi; Martínez García, Herminio; Pique Lopez, Robert
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 6007.1-6007.5
    Presentation's date: 2014-06-26
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Fuzzy logic controller design for battery energy management in a grid connected electro-thermal microgrid

     Arcos Aviles, Diego Gustavo; Vega Muñoz, Christian; Guinjoan Gispert, Francisco; Marroyo Palomo, Luis; Sanchis Gúrpide, Pablo
    IEEE International Symposium on Industrial Electronics
    p. 2014-2019
    DOI: 10.1109/ISIE.2014.6864926
    Presentation's date: 2014-06-01
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    A fuzzy logic controller strategy for battery energy management in a grid connected electro-thermal residential microgrid is presented. The fuzzy control policy manages the power of the microgrid storage elements in order to minimize a set of quality indices involving, among others, the power profile exchanged with the mains. Numerical simulations using real measured data generation and consumption are provided to both validate the control design and to highlight the benefits of including thermal elements in the overall energy management strategy of the system. © 2014 IEEE.

  • Energy-balance control of PV cascaded multilevel grid-connected inverters for phase-shifted and level-shifted pulse-width modulations

     Chavarria Roe, Javier; Biel Sole, Domingo; Guinjoan Gispert, Francisco; Meza Benavides, Carlos; Negroni Vera, Juan José
    IEEE transactions on industrial electronics
    Vol. 60, num. 1, p. 98-111
    DOI: 10.1109/TIE.2012.2186108
    Date of publication: 2013-01
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents an energy-balance control strategy for a cascaded single-phase grid-connected H-bridge multilevel inverter linking n independent photovoltaic (PV) arrays to the grid. The control scheme is based on an energy-sampled data model of the PV system and enables the design of a voltage loop linear discrete controller for each array, ensuring the stability of the system for the whole range of PV array operating conditions. The control design is adapted to phase-shifted and level-shifted carrier pulsewidth modulations to share the control action among the cascade-connected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PV arrays at its maximum power operating point. Experimental results carried out on a seven-level inverter are included to validate the proposed approach.

    This paper presents an energy-balance control strategy for a cascaded single-phase grid-connected H-bridge multilevel inverter linking n independent PV arrays to the grid. The control scheme is based on an energy-sampled data model of the PV system and enables the design of a voltage loop linear discrete controller for each array ensuring the stability of the system for the whole range of PV arrays operating conditions. The control design is adapted to Phase-Shifted and Level-Shifted Carrier PWM to share the control action among the cascadeconnected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PV arrays at its maximum power operating point. Experimental results carried out on a 7-level inverter are included to validate the proposed approach.

  • El concepto de Smart Metering en el nuevo escenario de distribución eléctrica

     Casellas Beneyto, Francisco; Pique Lopez, Robert; Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco
    Electro noticias
    num. 174-175, p. 36-43
    Date of publication: 2013-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Introduction to the special section on smart devices for renewable energy systems

     Cecati, Carlo; Guinjoan Gispert, Francisco; Siano, Pierluig; Spagnuolo, Giovanni
    IEEE transactions on industrial electronics
    Vol. 60, num. 3, p. 1119-1121
    DOI: 10.1109/TIE.2012.2219472
    Date of publication: 2013-03
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The papers in this special section focus on the topics of smart devices and applications for renewable energy systems.

  • Power adaptor device for domestic DC microgrids based on commercial MPPT inverters

     Valderrama Blavi, Hugo; Bosque, J.M.; Guinjoan Gispert, Francisco; Marroyo Palomo, Luis; Martínez Salamero, Luis
    IEEE transactions on industrial electronics
    Vol. 60, num. 3, p. 1191-1203
    DOI: 10.1109/TIE.2012.2198038
    Date of publication: 2013
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a power adaptor device, referred to as smart panel device, allowing the connection of additional energy sources and storage elements to a domestic photovoltaic (PV) grid-connected system. The adaptor output port is designed to behave as a power source/sink, thus enabling its hot-swap parallel connection to renewable power sources without modifying their maximum power point (MPP). Moreover, the adaptor device features a power characteristic with a single controllable MPP and allows the control of the injected power within the operating range of the dc¿ac grid-connected inverter. The work presents the design principles of such device by describing the operation of a sliding- mode controlled quadratic-boost converter. The proper operation of the device is experimentally verified for several scenarios in a small PV-based microgrid system including a fuel-cell stack, a 1-kW three-phase wind turbine, a battery charger¿discharger, and commercial grid-connected PV inverters

    This paper presents a power adaptor device, referred to as smart panel device, allowing the connection of additional energy sources and storage elements to a domestic photovoltaic (PV) grid-connected system. The adaptor output port is designed to behave as a power source/sink, thus enabling its hot-swap parallel connection to renewable power sources without modifying their maximum power point (MPP). Moreover, the adaptor device features a power characteristic with a single controllable MPP and allows the control of the injected power within the operating range of the dc–ac grid-connected inverter. The work presents the design principles of such device by describing the operation of a sliding- mode controlled quadratic-boost converter. The proper operation of the device is experimentally verified for several scenarios in a small PV-based microgrid system including a fuel-cell stack, a 1-kW three-phase wind turbine, a battery charger–discharger, and commercial grid-connected PV inverters

  • A study on multi-level PWM and asynchronous Sigma Delta modulations for enhanced bandlimited signal tracking in switching power amplifiers

     Garcia Tormo, Albert; Poveda Lopez, Alberto; Alarcon Gallo, Eduardo; Guinjoan Gispert, Francisco
    IEEE transactions on circuits and systems I: regular papers
    Vol. 60, num. 6, p. 1621-1634
    DOI: 10.1109/TCSI.2012.2220463
    Date of publication: 2013-06
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This work deals with multi-level switching amplifiers, in the context of high-efficiency power amplification for signal tracking applications. In particular, this paper evaluates the reduction in the error signal's power due to multi-level power amplification (compared to conventional two-level amplifiers) and compares the performance of two multi-level pulse modulations: PWM and Asynchronous Modulation. First the intrinsic bandwidth limits of multi-level switching amplifiers are inferred, to clearly state the advantages and limitations of multi-level power amplification. From the existing analyses of Pulse Width Modulation already reported in the literature, PWM is herein extended to multiple levels based on an equivalent representation, which allows to derive a closed expression for the power spectrum of multi-level PWM in bandlimited signal tracking. The Asynchronous Modulation is extended to multiple levels and the resulting multi-level encoding algorithm is analyzed in both time and frequency domains. The performance of both modulations is characterized and compared at different operating frequencies and using different number of levels. The main outcomes of this in-depth characterization show that, if the switching frequency is high enough, the tracking error is independent of the modulation and the switching frequency, i.e., it only depends upon the number of levels, which points out the suitability of asynchronous modulations for relatively low switching frequencies (compared to the number of levels).

    This work deals with multi-level switching amplifiers, in the context of high-efficiency power amplification for signal tracking applications. In particular, this paper evaluates the reduction in the error signal's power due to multi-level power amplification (compared to conventional two-level amplifiers) and compares the performance of two multi-level pulse modulations: PWM and Asynchronous ${{Sigma}} {{Delta}}$ Modulation. First the intrinsic bandwidth limits of multi-level switching amplifiers are inferred, to clearly state the advantages and limitations of multi-level power amplification. From the existing analyses of Pulse Width Modulation already reported in the literature, PWM is herein extended to multiple levels based on an equivalent representation, which allows to derive a closed expression for the power spectrum of multi-level PWM in bandlimited signal tracking. The Asynchronous ${{Sigma}} {{Delta}}$ Modulation is extended to multiple levels and the resulting multi-level encoding algorithm is analyzed in both time and frequency domains. The performance of both modulations is characterized and compared at different operating frequencies and using different number of levels. The main outcomes of this in-depth characterization show that, if the switching frequency is high enough, the tracking error is independent of the modulation and the switching frequency, i.e., it only depends upon the number of levels, which points out the suitability of asynchronous modulations for relatively low switching frequencies (compared to the number of levels).

  • MACHREK ENERGY DEVELOPMENT

     Martínez García, Herminio; Pique Lopez, Robert; Velasco Quesada, Guillermo; Casellas Beneyto, Francisco; Guinjoan Gispert, Francisco
    Competitive project

     Share

  • Estudio y simulación de MOSFETs de carburo de silicio (SiC) mediante PSIM para un inversor fotovoltaico en puente completo conectado a red

     Chavarria Roe, Javier; Biel Sole, Domingo; Guinjoan Gispert, Francisco; Poveda Lopez, Alberto; Alarcon Cot, Eduardo Jose; Massana, Francisco
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 50
    Presentation's date: 2013-07-11
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    El presente artículo muestra, mediante simulación PSIM, el impacto de la utilización de MOSFETs de Carburo de Silicio (SiC) en la eficiencia de inversores fotovoltaicos en puente completo conectados a red. Las simulaciones presentadas utilizan la facilidad ¿Device Database Editor¿ para construir modelos de MOSFET tanto de Si como de SiC y comparan diversos parámetros como la eficiencia o el rizado de la corriente de salida. Estas simulaciones también permiten establecer un método de diseño de la frecuencia de conmutación y del inductor de salida del inversor.

  • SiC Power JFET Electrothermal Macromodel

     Massana, Francisco; Chavarria Roe, Javier; Biel Sole, Domingo; Poveda Lopez, Alberto; Guinjoan Gispert, Francisco
    International Conference Mixed Design of Integrated Circuits and Systems
    p. 444-447
    Presentation's date: 2013-06-21
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    The Machreck Energy Development - Solar project MED-Solar  Open access

     Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco; Pique Lopez, Robert; Roman Lumbreras, Manuel; Vallvé, Xavier; Tarragó, J.; Bugatti, N.
    International Multi-Conference on Systems, Signals and Devices
    p. 6-13
    Presentation's date: 2013-03-19
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The aim of this communication is to introduce the project MED-Solar, acronym of Machrek Energy Development. This project is part of the new European Neighborhood Policy (ENP), policy that seeks to reinforce relations with neighboring countries to the east and south in order to promote prosperity, stability and security at its borders. The main objective of this project is the promotion and implementation of innovative technologies and know-how transfer in the field of solar energy, including that stemming from private sector, and that may be implemented in particular or public facilities through public procurement processes.

  • Battery management fuzzy control for a grid-tied microgrid with renewable generation

     Arcos Aviles, Diego Gustavo; Guinjoan Gispert, Francisco; Barricarte, J.; Marroyo Palomo, Luis; Sanchis Gúrpide, Pablo; Valderrama Blavi, Hugo
    Annual Conference of the IEEE Industrial Electronics Society
    p. 5607-5612
    DOI: 10.1109/IECON.2012.6389008
    Presentation's date: 2012-10
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    A fuzzy logic controller design for the battery management of a grid-tied real domestic microgrid including 6 kWp of PV and 6kW wind power renewable generators is presented. The fuzzy controller parameters design is undertaken on the basis of the minimization of a set of quality indices such as the battery dynamic range and the power variation range exchanged with the grid. The features of the proposed approach are highlighted with yearly real data by numerical simulations of the power profile injected into the grid and the battery state of charge.

  • Mathematical model of total cross-tied photovoltaic arrays in mismatching conditions

     Ramos Paja, Carlos Andres; Bastidas, Juan David; Saavedra Montes, Andres Julian; Guinjoan Gispert, Francisco; Goez, M.
    Colombian Workshop on Circuits and Systems
    p. 1-6
    DOI: 10.1109/CWCAS.2012.6404068
    Presentation's date: 2012-11
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a mathematical procedure for modeling rectangular (N rows with M modules each) and non-rectangular photovoltaic (PV) arrays in Total Cross-Tied (TCT) configuration operating in uniform and mismatching conditions. The proposed model uses the simple single diode representation for each PV module; then each row of the TCT array is represented as an equivalent non-linear PV circuit with a bypass diode, which allows to represent the TCT array as one string of equivalent PV circuits. The inflection voltages (array voltages that turn off the bypass diodes) of the string are calculated in order to solve only the non-linear equation system related to the active equivalent PV circuits for calculating the array current for a given voltage. Such a strategy reduces the computational burden and improves calculation speed. A TCT array of 4×2 with deep mismatching conditions was implemented in PSIM software to validate the proposed model, obtaining a correlation between model predicted data and the circuital simulation. The accuracy and improved calculation speed of the proposed model allow its use altogether with reconfiguration techniques as well as to reduce the time of energetic evaluations of TCT arrays for PV planning.

  • Influencia de los parámetros de diseño de un inversor fotovoltaico en la estabilidad de una microred

     Rodríguez Villarreal, José Raúl; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 390-395
    Presentation's date: 2012-07-13
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    El incremento de la generación de energía distribuida en la red eléctrica ha despertado inquietudes respecto a la estabilidad de la misma. Los generadores fotovoltaicos conectados a la red eléctrica tienen que lidiar con variaciones en el consumo y la generación en la red, esto puede afectar el desempeño y la estabilidad de los generadores y de la red. Este documento presenta el efecto de los par´ametros de un generador fotovoltaico y la relación generación/consumo en la estabilidad de una microred. Además, se ajusta la ganancia del controlador de corriente del generador en función del consumo con el fin mantener la estabilidad de la microred para diferentes escenarios de generación/consumo.

  • A design-oriented optimization framework for envelope trackers: Application to a sliding-mode control buck converter for EDGE

     Marco Platón, Lázaro; Poveda Lopez, Alberto; Guinjoan Gispert, Francisco; Maksimovic, Dragan; Alarcon Cot, Eduardo Jose
    International Power Electronics and Motion Control Conference
    p. 21-26
    Presentation's date: 2012-09
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Ripple-based prediction of fast-scale instabilities in current mode controlled switching converters

     Rodríguez Rodríguez, Enric; Martínez García, Herminio; Guinjoan Gispert, Francisco; El Aroudi, Abdelali; Poveda Lopez, Alberto; Alarcon Cot, Eduardo Jose
    IEEE International Symposium on Circuits and Systems
    p. 688-691
    DOI: 10.1109/ISCAS.2012.6272126
    Presentation's date: 2012-05-22
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Banco de ensayos para la caracterización del rendimiento energético y del rendimiento del MPPT en convertidores fotovoltaicos  Open access

     Casellas Beneyto, Francisco; Velasco Quesada, Guillermo; Pique Lopez, Robert; Guinjoan Gispert, Francisco
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 326-331
    Presentation's date: 2012-07-13
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    En este trabajo se presenta una propuesta de ensayo para caracterizar el comportamiento del algoritmo de seguimiento de punto de máxima potencia (MPPT: Maximum Power Point Tracking) programado en los convertidores fotovoltaicos (PV: Photo-Voltaic). Este ensayo también permite estimar el rendimiento energético de dichos convertidores. Para los ensayos propuestos se utiliza un simulador de generador fotovoltaico (SAS: Solar Array Simulator) junto con un equipo para la medida y registro de potencia instantánea. Los convertidores ensayados (DUT: Device Under Test) para verificar el banco de pruebas utilizado son: un inversor con inyección a red y un convertidor DC/DC para carga de baterías. Para la evaluación del sistema se han realizado dos tipos de ensayos, uno denominado estático, para evaluar las fluctuaciones del algoritmo MPPT alrededor del punto de máxima potencia (MPP: Maximum Power Point) del generador PV y otro ensayo, denominado dinámico, para evaluar el comportamiento del MPPT cuando se produce un cambio en el valor de los parámetros que determinan el MPP del generador PV. Finalmente se presentan los resultados obtenidos tras los ensayos realizados y se valora el comportamiento de los DUT.

  • Fundamental modulation limits for minimum switching frequency inband-error-free high-efficiency power amplifiers

     Garcia Tormo, Albert; Poveda Lopez, Alberto; Alarcon Cot, Eduardo Jose; Guinjoan Gispert, Francisco
    IEEE transactions on circuits and systems I: regular papers
    Vol. 58, num. 10, p. 2543-2555
    DOI: 10.1109/TCSI.2011.2123570
    Date of publication: 2011
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • A ripple-based design-oriented approach for predicting fast-scale instability in DC¿DC switching power supplies

     Rodriguez Vilamitjana, Enric; Guinjoan Gispert, Francisco; Alarcon Cot, Eduardo Jose; El Aroudi, Abdelali
    IEEE transactions on circuits and systems I: regular papers
    Vol. 58, num. 1, p. 215-227
    DOI: 10.1109/TCSI.2011.2161396
    Date of publication: 2011-12
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a design-oriented analytical approach for predicting fast-scale instability in power electronics converters under voltage-mode control strategy. This approach is based on the use of the ripple amplitude of the feedback control voltage as an index for predicting subharmonic oscillations in these systems. First, the work revisits the stability analysis technique based on the nonlinear discrete-time model, demonstrating that the ripple amplitude can be included within the expression of the Jacobian matrix of this model, hence giving a mathematical support to extend the ripple index to more complex topologies. A simple but representative buck converter under voltage-mode control is used to illustrate the approach. Using the ripple-based index, closed-form expressions of stability boundaries are derived. Unlike other available results obtained from existing methods, the stability boundary, in this work is expressed analytically in terms of both power stage and controller design parameters. Moreover, one can determine how these parameters are involved in the closed form expressions and, furthermore, how each parameter affects the stability of the system. The approach is validated by numerical simulations from the state equations and also experimentally within a wide range of the design parameter space.

  • Simulation-based criteria for the power sizing of grid-connected PV systems

     Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco; Pique Lopez, Robert; Roman Lumbreras, Manuel; Conesa Roca, Alfonso
    International Review on Modelling and Simulations
    Vol. 4, num. 5, p. 2524-2533
    Date of publication: 2011-10-01
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Stability analysis of grid-connected PV systems based on impedance frequency response

     RODRIGUEZ VILLAREAL, José Raúl; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    IEEE International Symposium on Industrial Electronics
    p. 1747-1752
    DOI: 10.1109/ISIE.2011.5984326
    Presentation's date: 2011-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The increase of distributed generation on electric networks has raised the concern of grid stability, among other issues. The PV generators connected to the grid have to deal with varying consumption and generation scenarios, however, this may affect the performance and stability of the generators themselves, as well as the grid. This document presents an analytical stability method to maintain the grid stability by adjusting the generator control parameters based on the impedance frequency response measured at the point of connection.

  • Access to the full text
    Estimación de posición en un motor síncrono de imanes permanentes mediante técnicas de inyección de alta frecuencia con control deslizante  Open access

     Repecho Del Corral, Victor; Arias Pujol, Antoni; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 355-360
    Presentation's date: 2011-07-06
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    En el presente documento, se muestra el estudio para la estimación de la posición del rotor de un Motor de Imanes Permanentes (PMSM), mediante inyección de señal de alta frecuencia (HF) bajo un control en modo deslizante (SMC). Las técnicas de inyección de alta frecuencia han sido utilizadas con éxito en sistemas de control de campo orientado (FOC), pero no dan buenos resultados en controles no lineales como el control directo de torque (DTC), por su mayor ancho de banda. Estas técnicas se basan en la medición indirecta de las inductancias de estátor, las cuales dependen del valor de la posición de rotor. En el presente estudio se muestra una técnica que permite utilizar técnicas de inyección bajo un control en modo deslizamiento. Para concluir se muestran simulaciones del sistema con los algoritmos de estimación propuestos, confirmando la utilidad del sistema propuesto.

  • A grounded-output 5-switch bipolar buck-boost converter topology for switching power amplifiers

     Garcia Tormo, Albert; Poveda Lopez, Alberto; Alarcon Cot, Eduardo Jose; Guinjoan Gispert, Francisco
    IEEE International Symposium on Circuits and Systems
    p. 2769-2772
    DOI: 10.1109/ISCAS.2011.5938179
    Presentation's date: 2011
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This work presents a switching converter topology which can boost and step down the supply voltage and can deliver both positive and negative voltages to a grounded load (bipolar converter topology with non-floating output). This topology, which uses five switches to perform the power conversion, is mostly intended for switching amplifiers, especially for applications which require both boosting and inverting the supply voltage (to supply bipolar voltage signals), and/or EMI-sensitive applications. Using a single-stage switching amplifier based on this 5-switch topology, it is feasible to supply a grounded load with a symmetrical bipolar voltage signal whose magnitude extends up to several times the magnitude of the supply voltage.

  • Access to the full text
    Análisis de la estabilidad de sistemas fotovoltaicos conectados a red mediante la respuesta frecuencial de la impedancia  Open access

     RODRIGUEZ VILLAREAL, José Raúl; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 297-302
    Presentation's date: 2011-07-06
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    El incremento de la generación de energía distribuida en la red eléctrica ha despertado inquietudes respecto a la estabilidad de la misma. Los generadores fotovoltaicos conectados a la red eléctrica tienen que lidiar con variaciones en el consumo y la generación en la red, esto puede afectar el desempeño y la estabilidad de los generadores y de la red. Este documento presenta un método analítico que permite mantener la estabilidad de la red eléctrica ajustando los parámetros del sistema de control del generador basado en la respuesta frecuencial de la impedancia vista desde el punto de conexión.

  • Angle estimation using high frequency injection for sliding mode controlled permanent magnet synchronous machines drives

     Repecho Del Corral, Victor; Biel Sole, Domingo; Arias Pujol, Antoni; Guinjoan Gispert, Francisco
    International Conference-Workshop on Compatibility and Power Electronics
    p. 161-166
    DOI: 10.1109/CPE.2011.5942225
    Presentation's date: 2011-06-01
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In this paper, high frequency injection (HF) technique for rotor position estimation using Sliding Mode Control (SMC) in Permanent Magnet Synchronous Machines (PMSMs) is presented. The novelty of this paper is the fact that the SMC is used instead of the conventional Field Oriented Control (FOC) and therefore the injected HF test signals for tracking the machine’ saliency (difference between Ld and Lq) is naturally eliminated by the SMC. Such suppression is tackled when using the SMC and the position signals are calculated to properly estimate the permanent magnet (PM) position. Finally, some simulation results are presented, confirming the proper angle estimation at low speed reversal and load impact at zero speed.

  • ARQUITECTURAS ELECTRONICAS DE POTENCIA PARA GENERACIÓN DISTRIBUIDA. ARQUITECTURA AC

     Pique Lopez, Robert; Velasco Quesada, Guillermo; Casellas Beneyto, Francisco; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    Competitive project

     Share

  • Energy Power sizing factor design of central inverter PV grid-connected systems: a simulation approach

     Velasco Quesada, Guillermo; Pique Lopez, Robert; Guinjoan Gispert, Francisco; Casellas Beneyto, Francisco; de la Hoz Casas, Jordi
    International Power Electronics and Motion Control Conference
    p. S9-32-S9-36
    DOI: 10.1109/EPEPEMC.2010.5606542
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Power sizing factor design of central inverter PV grid-connected systems: a simulation approach.  Open access

     Velasco Quesada, Guillermo; Pique Lopez, Robert; Guinjoan Gispert, Francisco; Casellas Beneyto, Francisco; de la Hoz Casas, Jordi
    International Power Electronics and Motion Control Conference
    p. S9-32-S9-36
    DOI: 10.1109/EPEPEMC.2010.5606542
    Presentation's date: 2010-09-06
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a simulation approach which can help in the preliminary power sizing design of a gridconnected PV system based on a single inverter configuration. Given a nominal peak power of the PV array, this simulation procedure leads to the PV inverter maximum rated power which maximizes the yearly injected energy to the grid.

  • Multi-level asynchronous Sigma Delta modulators for wideband switching power amplifiers

     Garcia Tormo, Albert; Poveda Lopez, Alberto; Alarcon Cot, Eduardo Jose; Guinjoan Gispert, Francisco
    IEEE Workshop on Computers in Power Electronics
    p. 1-8
    DOI: 10.1109/COMPEL.2010.5562381
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This work extends the Asynchronous ΣΔ Modulator and its Adaptive version to multi-level modulators, targeting wideband high-efficiency switching power amplifiers. The performance of these modulators is compared with the multi-level Pulse Width Modulator, the most common modulator in multilevel switching power amplifiers. Behavioural model simulation results show that, unlike the multi-level PWM (which can only be used at high switching frequencies), the Asynchronous ΣΔ Modulators can also be used at average switching frequencies close to the signal bandwidth. At high switching frequencies, the performance of all the modulators is similar. The Asynchronous ΣΔ Modulators have further and more important advantages, such as high PSRR (even at the input signal frequency), the ability of handling non-regular distributed voltage levels, or a low ratio between the average switching frequency and the maximum instantaneous switching frequency.

  • Access to the full text
    El concepto de Smart Metering en el nuevo escenario de distribución eléctrica  Open access

     Casellas Beneyto, Francisco; Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco; Pique Lopez, Robert
    Seminario Anual de Automática, Electrónica Industrial e Instrumentación
    p. 752-757
    Presentation's date: 2010-07-09
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    La medición inteligente se ha convertido en un tema de la máxima actualidad y de importancia creciente; ya se aplica la normativa para su despliegue, se desarrollan proyectos piloto y han llegado al mercado nuevos dispositivos. En este trabajo se recogen propuestas y tendencias de los contadores actuales de energía eléctrica. El contador se representa como la interfaz entre el sistema del usuario, que es el consumidorproductor distribuido de energía, y la red eléctrica. A partir de esta relación y con la tecnología electrónica actual aparece el concepto denominado “smart metering”. El documento describe las funciones de los contadores de energía eléctrica desde el inicio, con el contador electromecánico hace 120 años, hasta los dispositivos actuales. Se incluyen las características genéricas de medida, las tecnologías de estos equipos y referencias normativas que utilizan estos sistemas de medida de energía eléctrica. Se concluye con las tendencias previsibles en un futuro inmediato.

  • Access to the full text
    Simulation and analysis of distributed PV generation in a LV network using MATLAB-Simulink  Open access

     RODRIGUEZ VILLAREAL, José Raúl; RUIZ ALLENDE, Felipe; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    IEEE International Symposium on Circuits and Systems
    p. 2322-2325
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Power quality of electric networks with high penetration of photovoltaic systems has been analyzed in different publications. It has been noted that inverters may increase their harmonic emissions when connected to weak networks, this harmonics may affect other equipments connected to the network and decreasing their performance. This document shows the effects of connecting multiple photovoltaic generators in a network through simulations using MATLAB-Simulink SimPowerSystems.

    Postprint (author’s final draft)

  • Access to the full text
    Bandwidth-Enhancement gm-C Filter with independent ¿o and Q Tuning Mechanisms in Both Topology and Control Loops  Open access

     Martínez García, Herminio; Vidal Lopez, Eva Maria; Cantó, Andrea; Poveda Lopez, Alberto; Guinjoan Gispert, Francisco
    IEEE International Symposium on Circuits and Systems
    p. 3625-3628
    DOI: 10.1109/ISCAS.2010.5537780
    Presentation's date: 2010-05-30
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper deals with the proposal of a new topology for a gm-C continuous time filter which allows the adjustment and tuning of its characteristic parameters (ωO and Q) in an independent way (without cross-tuning), thereby extending the Q range of the filter for a particular ωO value. Additionally a comparison of three different Q-tuning algorithms is presented. It is shown that an LMS-based Q-control strategy allows to overcome the intrinsic dependence between the Q and ωO tuning loops. The combination of both the proposed filter topology and the selected control loop algorithms results in an enhanced transient performance as well as an improvement in terms of cross-detuning.

  • Power sizing factor design of central inverter PV grid-connected systems: a simulation approach

     Velasco Quesada, Guillermo; Pique Lopez, Robert; Guinjoan Gispert, Francisco; Casellas Beneyto, Francisco; de la Hoz Casas, Jordi
    Power Electronics and Motion Control Conference
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Takagi-sugeno fuzzy model to approximate mosfet capacitance for VRM applications

     López, Toni; Alarcon Cot, Eduardo Jose; Guinjoan Gispert, Francisco; Poveda Lopez, Alberto
    IEEE International Symposium on Circuits and Systems
    p. 613-616
    DOI: 10.1109/ISCAS.2010.5537519
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Bandwidth-enhancement g(m)-C filter with independent omega(O) and Q tuning mechanisms in both topology and control loops

     Martínez García, Herminio; Vidal Lopez, Eva Maria; Cantó, Andrea; Poveda Lopez, Alberto; Guinjoan Gispert, Francisco
    IEEE International Symposium on Circuits and Systems
    p. 3625-3628
    Presentation's date: 2010
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper deals with the proposal of a new topology for a gm-C continuous time filter which allows the adjustment and tuning of its characteristic parameters (ωO and Q) in an independent way (without cross-tuning), thereby extending the Q range of the filter for a particular ωO value. Additionally a comparison of three different Q-tuning algorithms is presented. It is shown that an LMS-based Q-control strategy allows to overcome the intrinsic dependence between the Q and ωO tuning oops. The combination of both the proposed filter topology and the selected control loop algorithms results in an enhanced ransient performance as well as an improvement in terms of cross-detuning.

  • Access to the full text
    Energy-balance and sliding mode control strategies of a cascade H-bridge multilevel converter for grid-connected PV systems  Open access

     Negroni Vera, Juan Jose; Biel Sole, Domingo; Guinjoan Gispert, Francisco; Meza Benavides, Carlos
    International Conference on Industrial Technology
    p. 1155-1160
    DOI: 10.1109/ICIT.2010.5472591
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This work presents the design of a sliding-mode based current controller for a Cascade Full Bridge Multilevel Inverter grid connected PV system. The design also includes a modulation strategy to share the control action among the cascade-connected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PVG at its maximum operating point. Experimental results are included to validate the proposed approach.

  • Sliding-mode control design applied to parallel-connected modular inverters through FPGA-based implementation

     Ramos Lara, Rafael Ramon; Biel Sole, Domingo; Fossas Colet, Enric; Guinjoan Gispert, Francisco
    IET control theory and applications
    Vol. 3, num. 12, p. 1611-1624
    DOI: 10.1049/iet-cta.2008.0187
    Date of publication: 2009-12
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Electrical PV array reconfiguration strategy for energy extraction improvement in grid-connected PV systems  Open access

     Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco; Pique Lopez, Robert; Roman Lumbreras, Manuel; Alfonso, Conesa
    IEEE transactions on industrial electronics
    Vol. 56, num. 11, p. 4319-4331
    Date of publication: 2009-11
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper applies a dynamical electrical array reconfiguration (EAR) strategy on the photovoltaic (PV) generator of a grid-connected PV system based on a plant-oriented configuration, in order to improve its energy production when the operating conditions of the solar panels are different. The EAR strategy is carried out by inserting a controllable switching matrix between the PV generator and the central inverter, which allows the electrical reconnection of the available PV modules. As a result, the PV system exhibits a self-capacity for real-time adaptation to the PV generator external operating conditions and improves the energy extraction of the system. Experimental results are provided to validate the proposed approach.

  • Advanced Wide Band Gap Semiconductor Devices for Rational Use of Energy (RUE)

     Biel Sole, Domingo; Garcia Tormo, Albert; Alarcon Cot, Eduardo Jose; Fernandez Martinez, Daniel; Masana Nadal, Francisco; Poveda Lopez, Alberto; Guinjoan Gispert, Francisco
    Competitive project

     Share

  • Interleaving Quasi-Sliding-Mode Control of Parallel-Connected Buck-Based Inverters

     Ramos Lara, Rafael Ramon; Biel Sole, Domingo; Fossas Colet, Enric; Guinjoan Gispert, Francisco
    IEEE transactions on industrial electronics
    Vol. 55, num. 11, p. 3865-3873
    DOI: 10.1109/TIE.2008.2006016
    Date of publication: 2008-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Energy-Balance Modeling and Discrete Control for Single-Phase Grid-Connected PV Central Inverters

     Meza Benavides, Carlos; Negroni Vera, Juan Jose; Biel Sole, Domingo; Guinjoan Gispert, Francisco
    IEEE transactions on industrial electronics
    Vol. 55, num. 7, p. 2734-2743
    Date of publication: 2008-07
    Journal article

     Share Reference managers Reference managers Open in new window

  • Diseño de un controlador difuso supervisor para la regulación de un convertidor conmutado elevador

     Gomariz Castro, Spartacus; Guinjoan Gispert, Francisco
    Revista de ingeniería
    Vol. 28, p. 38-50
    Date of publication: 2008-11
    Journal article

     Share Reference managers Reference managers Open in new window

  • Simulation of fuzzy-based MPP tracker and performance comparison with perturb & observe method

     Chouder, Aissa; Guinjoan Gispert, Francisco; Silvestre Berges, Santiago
    Revue des energies renouvelables
    Vol. 11, num. 4, p. 577-586
    Date of publication: 2008-12
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Energy Efficiency Improvement in Reconfigurable Grid-Connected PV Systems with Adjustable Sizing Factor strategy

     Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco; Pique Lopez, Robert
    23rd European Photovoltaic Solar Energy Conference and Exhibition (23rd EU PVSEC)
    p. 1983-1988
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Grid-connected PV systems energy extraction improvement by means of an Electric Array Reconfiguration (EAR) strategy: Operating principle and experimental results

     Velasco Quesada, Guillermo; Guinjoan Gispert, Francisco; Pique Lopez, Robert
    39th IEEE Power Electronics Specialists Conference. PESC 2008
    p. 1983-1988
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window