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Papers by Francisco Freijedo

Research paper thumbnail of Multilevel Multiphase Feedforward Space-Vector Modulation Technique

IEEE Transactions on Industrial Electronics, 2000

Research paper thumbnail of A Technique to Estimate the Equivalent Loss Resistance of Grid-Tied Converters for Current Control Analysis and Design

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Assessment and Optimization of the Transient Response of Proportional-Resonant Current Controllers for Distributed Power Generation Systems

IEEE Transactions on Industrial Electronics, 2000

Research paper thumbnail of Evolutive algorithm for power flow optimization

2009 35th Annual Conference of IEEE Industrial Electronics, 2009

Research paper thumbnail of Inner current loop analysis and design based on resonant regulators for isolated microgrids

2015 IEEE 13th Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC), 2015

Research paper thumbnail of Contributions to Grid-Synchronization Techniques for Power Electronic Converters

Real time grid-synchronization techniques are studied in this dissertation. The synchronization b... more Real time grid-synchronization techniques are studied in this dissertation. The synchronization block is a crucial part of the controller in grid-connected power converters. The phase-angle of the voltage/current vector fundamental component at the point of common coupling (PCC) should be tracked online in order to control the energy transfer between the power converter and the ac mains. Synchronization algorithms have been evolving since the first analog zero-cross detectors to current high performance digital implementations. An in-depth review of the state-of-art in grid synchronization is contributed in the Chapter 2 of this PhD dissertation. In some ways, it could be said that the grid synchronization state-of-art has been evolving to avoid malfunctions due to power quality phenomena. The Ainsworth proposal of using a voltage controlled oscillator (VCO) inside the control loop of a High Voltage Direct Current (HVDC) successfully dealt with the novel, at that time, harmonic inst...

Research paper thumbnail of Space Vector PWM With Common-Mode Voltage Elimination for Multiphase Drives

IEEE Transactions on Power Electronics, 2016

Research paper thumbnail of A Method for Identification of the Equivalent Inductance and Resistance in the Plant Model of Current-Controlled Grid-Tied Converters

Ieee Transactions on Power Electronics, 2016

Research paper thumbnail of A Control Algorithm for Electric Vehicle Fast Charging Stations Equipped with Flywheel Energy Storage Systems

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Small-Signal Modeling, Stability Analysis, and Design Optimization of Single-Phase Delay-Based PLLs

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Ecualización Dinámica De Corriente Mediante Fpga Para Un Convertidor CC-CC Multifase

En este artículo se presenta una solución a la ecualización de corrientes en un convertidor reduc... more En este artículo se presenta una solución a la ecualización de corrientes en un convertidor reductor multifase. La solución propuesta se basa en la comparación de la corriente de pico instantánea en el MOSFET principal de cada fase con la media dinámica de las corrientes de pico de todos los módulos CC-CC. Esta comparativa es suficiente para igualar las corrientes medias de todas las fases variando consecuentemente el ciclo de trabajo de cada una de ellas. Con ello se logra igualar la potencia entregada por fase y aumentar la fiabilidad de todo el conjunto, ya que no se sobrecargan unos módulos más que otros. La implementación de la etapa de potencia se ha realizado empleando tecnología SMD y todo el control se ha integrado en una FPGA.

Research paper thumbnail of Desarrollo Tutorizado De Un Informe Técnico Como Herramienta De Aprendizaje Sobre Emc, Confiabilidad y Seguridad De Equipos Electrónicos

Para poder desarrollar mejor las competencias de comunicación escrita y oral de los estudiantes d... more Para poder desarrollar mejor las competencias de comunicación escrita y oral de los estudiantes de ingeniería industrial, de la orientación instalaciones y construcción, se emplea un trabajo que consiste en la elaboración de un informe técnico consistente en tres documentos: un informe, un juego de transparencias y un guión para las transparencias. Aspectos complejos de los equipos electrónicos relacionados con la compatibilidad electromagnética, la fiabilidad y la seguridad son abordados y asimilados; buscando y leyendo información, y también mediante la creación del informe. La tutorización del informe ayuda al alumnado a descubrir y entender cómo la información puede ser clasificada y ordenada para, más tarde, obtener de ella una presentación adecuada para los diferentes tipos de audiencias técnicas.

Research paper thumbnail of Slides

Research paper thumbnail of A Quasi-Type-1 Phase-Locked Loop Structure

IEEE Transactions on Power Electronics, 2014

Research paper thumbnail of An Efficient Implementation of Generalized Delayed Signal Cancellation PLL

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of A Method for Identification of the Equivalent Inductance and Resistance in the Plant Model of Current-Controlled Grid-Tied Converters

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Torque ripple minimization in surface-mounted PM drives by means of PI + multi-resonant controller in synchronous reference frame

IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society, 2010

Research paper thumbnail of Tuning of Synchronous-Frame PI Current Controllers in Grid-Connected Converters Operating at a Low Sampling Rate by MIMO Root Locus

IEEE Transactions on Industrial Electronics, 2015

Research paper thumbnail of Leakage current evaluation of a single-phase transformerless PV inverter connected to the grid

Apec 2007: Twenty-Second Annual Ieee Applied Power Electronics Conference and Exposition, Vols 1 and 2, 2007

Research paper thumbnail of Robust phase locked loops optimized for DSP implementation in power quality applications

2008 34th Annual Conference of IEEE Industrial Electronics, 2008

Abstract—Phase locked loop (PLL) algorithms for grid syn-chronization are a very important part o... more Abstract—Phase locked loop (PLL) algorithms for grid syn-chronization are a very important part of the control in most of the grid-connected power converters applications. The perfor-mance of the PLL should not be much affected under distorted grid conditions: the presence of ...

Research paper thumbnail of Multilevel Multiphase Feedforward Space-Vector Modulation Technique

IEEE Transactions on Industrial Electronics, 2000

Research paper thumbnail of A Technique to Estimate the Equivalent Loss Resistance of Grid-Tied Converters for Current Control Analysis and Design

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Assessment and Optimization of the Transient Response of Proportional-Resonant Current Controllers for Distributed Power Generation Systems

IEEE Transactions on Industrial Electronics, 2000

Research paper thumbnail of Evolutive algorithm for power flow optimization

2009 35th Annual Conference of IEEE Industrial Electronics, 2009

Research paper thumbnail of Inner current loop analysis and design based on resonant regulators for isolated microgrids

2015 IEEE 13th Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC), 2015

Research paper thumbnail of Contributions to Grid-Synchronization Techniques for Power Electronic Converters

Real time grid-synchronization techniques are studied in this dissertation. The synchronization b... more Real time grid-synchronization techniques are studied in this dissertation. The synchronization block is a crucial part of the controller in grid-connected power converters. The phase-angle of the voltage/current vector fundamental component at the point of common coupling (PCC) should be tracked online in order to control the energy transfer between the power converter and the ac mains. Synchronization algorithms have been evolving since the first analog zero-cross detectors to current high performance digital implementations. An in-depth review of the state-of-art in grid synchronization is contributed in the Chapter 2 of this PhD dissertation. In some ways, it could be said that the grid synchronization state-of-art has been evolving to avoid malfunctions due to power quality phenomena. The Ainsworth proposal of using a voltage controlled oscillator (VCO) inside the control loop of a High Voltage Direct Current (HVDC) successfully dealt with the novel, at that time, harmonic inst...

Research paper thumbnail of Space Vector PWM With Common-Mode Voltage Elimination for Multiphase Drives

IEEE Transactions on Power Electronics, 2016

Research paper thumbnail of A Method for Identification of the Equivalent Inductance and Resistance in the Plant Model of Current-Controlled Grid-Tied Converters

Ieee Transactions on Power Electronics, 2016

Research paper thumbnail of A Control Algorithm for Electric Vehicle Fast Charging Stations Equipped with Flywheel Energy Storage Systems

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Small-Signal Modeling, Stability Analysis, and Design Optimization of Single-Phase Delay-Based PLLs

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Ecualización Dinámica De Corriente Mediante Fpga Para Un Convertidor CC-CC Multifase

En este artículo se presenta una solución a la ecualización de corrientes en un convertidor reduc... more En este artículo se presenta una solución a la ecualización de corrientes en un convertidor reductor multifase. La solución propuesta se basa en la comparación de la corriente de pico instantánea en el MOSFET principal de cada fase con la media dinámica de las corrientes de pico de todos los módulos CC-CC. Esta comparativa es suficiente para igualar las corrientes medias de todas las fases variando consecuentemente el ciclo de trabajo de cada una de ellas. Con ello se logra igualar la potencia entregada por fase y aumentar la fiabilidad de todo el conjunto, ya que no se sobrecargan unos módulos más que otros. La implementación de la etapa de potencia se ha realizado empleando tecnología SMD y todo el control se ha integrado en una FPGA.

Research paper thumbnail of Desarrollo Tutorizado De Un Informe Técnico Como Herramienta De Aprendizaje Sobre Emc, Confiabilidad y Seguridad De Equipos Electrónicos

Para poder desarrollar mejor las competencias de comunicación escrita y oral de los estudiantes d... more Para poder desarrollar mejor las competencias de comunicación escrita y oral de los estudiantes de ingeniería industrial, de la orientación instalaciones y construcción, se emplea un trabajo que consiste en la elaboración de un informe técnico consistente en tres documentos: un informe, un juego de transparencias y un guión para las transparencias. Aspectos complejos de los equipos electrónicos relacionados con la compatibilidad electromagnética, la fiabilidad y la seguridad son abordados y asimilados; buscando y leyendo información, y también mediante la creación del informe. La tutorización del informe ayuda al alumnado a descubrir y entender cómo la información puede ser clasificada y ordenada para, más tarde, obtener de ella una presentación adecuada para los diferentes tipos de audiencias técnicas.

Research paper thumbnail of Slides

Research paper thumbnail of A Quasi-Type-1 Phase-Locked Loop Structure

IEEE Transactions on Power Electronics, 2014

Research paper thumbnail of An Efficient Implementation of Generalized Delayed Signal Cancellation PLL

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of A Method for Identification of the Equivalent Inductance and Resistance in the Plant Model of Current-Controlled Grid-Tied Converters

IEEE Transactions on Power Electronics, 2015

Research paper thumbnail of Torque ripple minimization in surface-mounted PM drives by means of PI + multi-resonant controller in synchronous reference frame

IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society, 2010

Research paper thumbnail of Tuning of Synchronous-Frame PI Current Controllers in Grid-Connected Converters Operating at a Low Sampling Rate by MIMO Root Locus

IEEE Transactions on Industrial Electronics, 2015

Research paper thumbnail of Leakage current evaluation of a single-phase transformerless PV inverter connected to the grid

Apec 2007: Twenty-Second Annual Ieee Applied Power Electronics Conference and Exposition, Vols 1 and 2, 2007

Research paper thumbnail of Robust phase locked loops optimized for DSP implementation in power quality applications

2008 34th Annual Conference of IEEE Industrial Electronics, 2008

Abstract—Phase locked loop (PLL) algorithms for grid syn-chronization are a very important part o... more Abstract—Phase locked loop (PLL) algorithms for grid syn-chronization are a very important part of the control in most of the grid-connected power converters applications. The perfor-mance of the PLL should not be much affected under distorted grid conditions: the presence of ...

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