Browsing by Author "Lizana Gajardo, Alonso Javier"

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    A Novel Three-Port NPC Converter for Grid-Tied Photovoltaic Systems with Integrated Battery Energy Storage
    (IEEE, 2020) Neira, Sebastián; Lizana Gajardo, Alonso Javier; Pereda Torres, Javier Eduardo
    The variable behaviour of the photovoltaic (PV) generation arises as the main drawback of this technology. Therefore, Battery Energy Storage (BES) units appear as a promising solution to overcome the inherent intermittent generation profile of PV systems. BES can be implemented separated from the PV generation units or integrated within a single power system. The latter option gives a better dynamic response, as the variable generation can be directly complemented with the BES, controlling the power flow between both elements with the grid. Thus, there is a need for power converters with capability of interface both PV and BES with the grid in a reliable and efficient way. This paper proposes a Three-Port NPC converter to connect a PV array and a BES unit with the ac grid using a single power processing stage. The converter is based in the H-NPC inverter and allows the connection of a low voltage battery to act as a power buffer ensuring a firm energy dispatch to the grid. Furthermore, simulation results show that the proposed topology maintains the good performance of the H-NPC in terms of efficiency, voltage harmonic distortion and reduced leakage current
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    A Novel Three-Port NPC Converter for Grid-Tied Photovoltaic Systems with Integrated Battery Energy Storage
    (IEEE, 2020) Neira Castillo, Sebastian Felipe; Lizana Gajardo, Alonso Javier; Pereda Torres, Javier Eduardo
    The variable behaviour of the photovoltaic (PV) generation arises as the main drawback of this technology. Therefore, Battery Energy Storage (BES) units appear as a promising solution to overcome the inherent intermittent generation profile of PV systems. BES can be implemented separated from the PV generation units or integrated within a single power system. The latter option gives a better dynamic response, as the variable generation can be directly complemented with the BES, controlling the power flow between both elements with the grid. Thus, there is a need for power converters with capability of interface both PV and BES with the grid in a reliable and efficient way. This paper proposes a Three-Port NPC converter to connect a PV array and a BES unit with the ac grid using a single power processing stage. The converter is based in the H-NPC inverter and allows the connection of a low voltage battery to act as a power buffer ensuring a firm energy dispatch to the grid. Furthermore, simulation results show that the proposed topology maintains the good performance of the H-NPC in terms of efficiency, voltage harmonic distortion and reduced leakage current.
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    Control predictivo de motor de inducción accionado por un conversor de tres puertos para un vehículo eléctrico con celda de combustible
    (2023) Lizana Gajardo, Alonso Javier; Pereda Torres, Javier Eduardo; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    Los vehículos electricos más fabricados en la actualidad utilizan baterías, pero estas poseen una densidad energética media, lo que los hace poco competitivos en ciertas aplicaciones que manejan grandes cargas y/o que requieren de muy alta autonomía. Este nicho puede ser ocupado por los vehículos de celda de combustible híbridos, que poseen una alta densidad energética debido a su fuente de energía principal. Por este motivo, se hace importante el desarrollo de sistemas de almacenamiento de energía híbridos eficientes que puedan facilitar la integracion de este tipo de vehículos. En esta tesis se desarrolla un controlador predictivo de corriente para un conversor de tres puertos, el cual acciona un motor de induccion, con el objetivo de analizar la aplicabilidad de este conversor en vehículos electricos de celda de combustible híbridos. Ademas, se diseña un inductor acoplado para el conversor de tres puertos con el fin de reducir las corrientes AC circulantes de este. El controlador propuesto fue implementado en un banco de pruebas, utilizando el inductor acoplado, y se simuló computacionalmente el sistema utilizando modelos de fuentes de poder reales para analizar su rendimiento en condiciones típicas de un vehículo eléctrico como aceleración, desaceleración y frenado regenerativo.
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    Finite Control Set Model Predictive Current Control (FCS-MPCC) of Three-Port Converter for Fuel Cell Hybrid Electric Vehicles
    (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2025) Lizana Gajardo, Alonso Javier; Pereda Torres, Javier; Rubio, Felipe; Rojas Lobos, Felix Eduardo
    Fuel cell hybrid electric vehicles (FCEVs) are considered an appealing option for heavy-duty and long-distance vehicles. However, they require the use of multiple power converters to manage power distribution among the fuel cell, battery or ultracapacitor, and AC motor, leading to increased power losses and a more complex system. To overcome this challenge, multi-port power converters have been proposed to combine two power sources and the AC motor into one conversion stage, boosting overall efficiency and power density in hybrid powertrains. However, these converters still rely on a high number of semiconductors and involve complex control systems. This paper introduces a three-port converter (TPC) for FCHEVs, using only one power stage with 6 semiconductors, achieving high performance control of an ac motor, a fuel cell and a battery. A multivariable optimal control (Finite-Control-Set Model Predictive Current Control) manages the power flows between the energy sources and drives the motor simultaneously. Additionally, the performance of the multiport converter is improved by replacing its three inductors with a custom coupled inductor designed to reduce circulating AC currents. This innovation contributes to improved efficiency and overall functionality of the FCHEV system. The proposed system was validated through an 0.5kW experimental test bench and simulations of an urban driving cycle. The system controlled the multiple variables of the hybrid system with proper operation and fast dynamics, meanwhile the coupled inductor decreases the current magnitude in 20% compared to the non-coupled configuration.