Browsing by Author "Pereda Torres, Javier"

Now showing 1 - 20 of 39
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    A decoupled Nearest Level Control for a Modular Multilevel Cascade Converter based on Triple Star Bridge Cells (MMCC-TSBC)
    (2021) Shamshuddin, Mohammed Azharuddin; Arancibia, David; Rojas, Félix; Pereda Torres, Javier; Kennel, Ralph
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    A Modified Multi-Winding DC-DC Flyback Converter for Photovoltaic Applications
    (2021) Pesce, Cristian; Riedemann, Javier; Pena, Ruben; Degano, Michele; Pereda Torres, Javier; Villalobos, Rodrigo; Maury, Camilo; Young, Hector; Andrade, Ivan
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    A Modular Solid State Transformer for Future Hybrid Distribution Networks
    (2021) Lillo, Jonathan; Verdugo, Diego; Rojas, Félix; Azharuddin, Mohammed; Pereda Torres, Javier
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    A technical overview of single-stage three-port dc-dc-ac converters
    (2022) Neira, Sebastian; Blatsi, Zoe; Merlin, Michael M. C.; Pereda Torres, Javier
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    An Overview of Four-Leg Converters: Topologies, Modulations, Control and Applications
    (2022) Felix Rojas; Roberto Cardenas; Claudio Burgos-Mellado; Enrique Espina; Pereda Torres, Javier; Cristian Pineda; David Arancibia; Matias Diaz
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    Back To Back Modular Multilevel Converter With Dynamic Hybrid Link For High Performance Drive
    (2021) Lillo, Jonathan; Rojas, Félix; Pereda Torres, Javier; Valdes, Dario; Cardenas, Roberto
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    Capacitor Balance Control of a Modular Multilevel Converter Based on Parallel Connected Branches for a MVAC/LVDC Solid State Transformer
    (2021) Verdugo, Diego; Lillo, Jonathan; Rojas, Félix; Azharuddin, Mohammed; Pereda Torres, Javier
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    Circulating Current Suppression in DAB Assisted Low-Voltage Variable Frequency MMC
    (2022) Rodrigo Aguilar; Luca Tarisciotti; Pereda Torres, Javier
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    Closed-Loop Performance Improvement for MMCs Based on Optimal Reference Governor
    (2021) Poblete, Pablo; Neira, Sebastian; Cuzmar, Rodrigo; Aguilera, Ricardo P.; Mora, Andres; Pereda Torres, Javier
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    Computationally Efficient MPC for Modular Multilevel Matrix Converters Operating With Fixed Switching Frequency
    (2023) Rodrigo H. Cuzmar; Andrés Mora; Pereda Torres, Javier; Ricardo P. Aguilera; Pablo Poblete; Sebastián Neira
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    Constrained MPC for Intercluster Energy Control of Modular Multilevel Matrix Converters
    (2023) Rodrigo Cuzmar; Andrés Montenegro; Andrés Mora; Pereda Torres, Javier; Ricardo P. Aguilera
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    Control predictivo basado en secuencia de conmutación óptima para un conversor de tres puertos aplicado a vehículos eléctricos
    (2024) Rubio Achondo, Felipe Andrés; Pereda Torres, Javier; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    Multi-port power converters have a very important role today because they are used used in electromobility applications and hybrid energy storage systems (HESS). However, their optimal operation requires advanced control techniques due to the handling of multiple variables simultaneously. This thesis presents the development of an Optimal Switching Sequence (OSS) model predictive control (MPC) method applied to a three-port converter (TPC), which has been connected to an anisotropic permanent magnet synchronous machine (PMSM) and two dc voltage sources (VS). Based on a review of TPCs, classical control methods and MPC methods, the converter used with its mathematical formulation is presented. Then, theoretical principles of vector modulation and the machine for the design of the current controller are presented. The latter is based on two steps, the first one uses the dynamic model of the machine to find the optimal seven-segment witching sequence (7S-SS) that reduces the value of an objective function without using weighting factors and the second one uses the redundant vectors (zero vectors) optimally distributed to control the current in another of the ports.The results validate the method by experimental and simulation tests. The strategy presents a defined harmonic distortion, without sacrificing the dynamic response. In addi tion, an implementation with asymmetric modulation reduces the tracking error by 65.36% and a delay compensation reduces it by 92%. Furthermore, the new strategy manages to reduce the optimization problems to be solved by the steady-state algorithm from 6 to 1. Thus, the proposed control becomes attractive for implementation in real hybrid sys tems, which impose challenges of durability, versatility and reliability to the electrical system.
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    Design and implementation of dual active bridge converter with single phase shift modulation for electric vehicle charging system
    (2021) Navarro, Guillermo; Rojas, Félix; Pereda Torres, Javier; Diaz, Matias; Gatica, Gustavo
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    Design, Analysis and Experimental Verification of Arm Link Enhanced Modular Multilevel Converter
    (2024) Aguilar Villaseca, Rodrigo Ignacio; Tarisciotti, L.; Pereda Torres, Javier
    The Modular Multilevel Converter has gained attention in high- and medium-voltage DC-AC conversion due to its modularity, scalability, and excellent results in power quality and efficiency. However, its complexity, multiple control loops, and extensive measurements make it unsuitable for low-voltage applications. Additionally, the power ripple in sub-modules, poses challenges in low-voltage scenarios. To overcome the disadvantages of the MMC at low voltage and operate it from zero frequency to high output frequency, the Arm Link Enhanced Modular Multilevel Converter (ALE-MMC) was proposed, which employs dual active bridges to transfer power ripple between the upper and lower submodules, substantially reducing its capacitance and eliminating all voltage measurements from the submodules. This work analyzes and test the ALE-MMC in the entire operating range, giving design insights, and highlighting the various benefits the proposed topology can obtain in low voltage drives applications in terms of circulating currents control, Dual Active Bridge requirements and efficiency. Simulation results are presented in a three-phase converter to verify its operation at high power, and experimental results of a low-scale single-phase prototype are used to assess the operation under different scenarios.
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    Detector de partículas híbrido con resolución espacial mejorada
    (2024) Masoliver Aguirre, Pavel Ilyan; Abusleme Hoffman, Ángel Christian; Pereda Torres, Javier; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    En la actualidad, los detectores de partículas pueden ser encontrado en diversos instrumentos utilizados en distintos campos, desde la medicina hasta la física de partículas. Para la construcción de estos instrumentos uno de los elementos comúnmente utilizados son los centelladores plásticos orgánicos, debido a su facilidad de producción y bajo costo. Los instrumentos que se han implementado, en general, se pueden dividir en dos arquitecturas de detección: segmentados y tiempo de vuelo. La principal desventaja de ellos es que, mientras el primero utiliza un gran número de canales de lectura, presentando un mayor costo, el segundo no alcanza una resolución espacial suficiente para ciertas aplicaciones. Es por esto que se presenta un nuevo concepto híbrido de detectores de partículas que permite una resolución espacial del orden de la de los detectores segmentados, pero con un menor número de canales de lectura al utilizar información del tiempo de vuelo. Para transformar cada elemento de resolución en diferencias de tiempo se propuso una línea de retardo discreta. Se introdujo una nueva cifra de desempeño, Longitud Sensible Específica (SSL), para comparar de manera efectiva detectores que utilizan diferentes técnicas y lógicas de posicionamiento. Se desarrolló un prototipo unidimensional conformado por centelladores plásticos y fotomultiplicadores de silicio (SiPM) acoplados a ellos. Para aumentar el número de elementos de resolución se utilizó una técnica de solapamiento de centelladores. Cada SiPM se conectó a una intersección de la línea de retardo discreta, y los extremos de esta se acoplaron a dos módulos de lectura formados por un preamplificador, pulse-shaper y discriminador. Las pruebas realizadas mostraron la factibilidad de resolver la posición de los centelladores activados mediante las diferencias de tiempo de llegada de las señales eléctricas que se transmiten por la línea de retardo discreta. Los resultados indicaron que la resolución espacial del prototipo es del orden de los milímetros, similar a lo obtenido en instrumentos segmentados. Por otro lado, al utilizar sólo dos canales de lectura para determinar las diferencias de tiempo de las señales, la lógica de lectura del prototipo es comparable con la de los instrumentos basados en tiempo de vuelo. Comparando el prototipo desarrollado con diferentes instrumentos de la literatura en términos de la SSL, se observó que el valor de esta cifra es del orden de la de los instrumentos basados en tiempo de vuelo, pero con una mejor resolución espacial. Esto permite decir que el concepto propuesto utiliza de manera más eficiente los canales de lectura en comparación con otras implementaciones.
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    Distributed Control for Modular Multilevel Cascaded Converters: Toward a Fully Modular Topology
    (2023) Claudio Burgos-Mellado; Pereda Torres, Javier; Andrés Mora; Roberto Cardenas-Dobson; Tomislav Dragicevic
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    Distributed Neural Network Observer for Submodule Capacitor Voltage Estimation in Modular Multilevel Converters
    (2022) Pablo Poblete; German Pizarro; Gabriel Droguett; Felipe Nunez; Paul D. Judge; Pereda Torres, Javier
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    Extended Kalman Filtering for Floating Capacitor Voltage Estimation on Triple Star Bridge Cells
    (2025) Lillo Cartes, Jonathan Andrés; Rojas Lobos, Felix Eduardo; Pereda Torres, Javier; Verdugo Naranjo, Diego Arturo
    Modular multilevel cascade converters (MMCCs) have emerged as one of the most attractive topologies for medium and high-voltage applications due to their modularity, scalability, redundancy, and high power quality. Voltage balancing in power submodule (SM) capacitors plays a critical role in the internal energy balancing of the MMCC, making monitoring SM capacitor voltages a crucial task.However, achieving higher operating voltages requires a substantial increase in the number of voltage sensors and communication lines. This escalation in hardware complexity renders the system more reliant on sensors, reducing its reliability. Several techniques for estimating capacitor voltages have been presented to address this control and design burden. This work proposes an extended Kalman filter (EKF)-based observer for capacitor voltage estimation of all SMs in a triple-star bridge converter (TSBC). The proposed approach operates effectively under both open-loop and closed-loop conditions during transients and steady-state operation, enabling a decoupled controller using just one voltage and one current sensor per cluster. Experiments conducted in a TSBC composed of 27 SMs demonstrate the effectiveness of the proposed approach during transients and steady-state operation.