Artículos de conferencia

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Browsing Artículos de conferencia by browse.metadata.categoriaods "07 Energía asequible y no contaminante"

Now showing 1 - 20 of 34
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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, Felix; Pereda Torres, Javier; Kennel, Ralph
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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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    Approaches to USJ Formation Beyond Molecular Implantation
    (2008) Hatem, C.; Renau, A.; Godet, L.; Kontos, A.; Papasouliotis, G.; England, J.; Arévalo, Edward
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    Back To Back Modular Multilevel Converter With Dynamic Hybrid Link For High Performance Drive
    (2021) Lillo, Jonathan; Rojas, Felix; Pereda Torres, Javier; Valdes, Dario; Cardenas, Roberto
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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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    Consensus-Based Distributed Control of a Multilevel Battery Energy Storage System
    (IEEE, 2020) Neira Castillo, Sebastian Felipe; Poblete Durruty, Pablo Martín; Pereda Torres, Javier Eduardo; Nuñez Retamal, Felipe Eduardo
    Battery Energy Storage Systems (BESS) based on modular multilevel cascaded topologies allow splitting the battery array into the converter sub-modules, improving efficiency and reliability of the solution. Modular converters can perform active balance of the battery packs and regulation of the output power through the use of multi-objective controllers commanding the power of each sub-module accordingly. However, despite the hardware modularity of multilevel BESS, the controller is usually based on centralized designs, which present issues in terms of computational load and scalability. This paper proposes a two-layer distributed control scheme, based on a high-level consensus algorithm to perform the State of Charge (SoC) balance and low-level individual multi-variable controllers to regulate the operation of the converter sub-modules. The controller was implemented in a cascaded topology, where each sub-module determines and regulates its output power considering the information of its neighbours. The proposed solution allows to fully exploit the modularity of the converter, distributing the control units in the power modules to improve the overall flexibility and scalability of the system. Simulations results validate the operation of the proposed system, showing how the converter sub-modules distribute its power outputs to equalize the SoC levels. Furthermore, the distribution of the multi-variable controllers reduces the computational burden, as each unit just regulates the operation of the respective sub-module.
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    Distributed Current Control of Cascaded Multilevel Inverters
    (IEEE, 2019) Poblete Durruty, Pablo Martín; Pereda Torres, Javier Eduardo; Nuñez Retamal, Felipe Eduardo; Aguilera, Ricardo P.
    Multilevel inverters are widely used in the medium voltage energy market. Among them, the Cascaded H-Bridge (CHB) and Modular Multilevel Inverter (MMC) stand out for their modular hardware, which allows the easy replacement of their modules in the case of failures. Normally, these converters are operated with centralized control schemes, which require a large processing capacity, multiple digital outputs and wires for the switching signals of the transistors. The use of a centralized controller reduces the modularity of the system and generates difficulties as the number of inverters connected in series (cells) increases. In this work, a distributed control strategy for CHB converters is proposed, allowing each cell to have an independent local controller, which increases the modularity of the multilevel converter without deteriorating the performance of the system. Extensive simulations are carried out, showing the advantages and disadvantages of the proposed distributed control strategy offers when compared to a PI current controller on dq axes and Shifted PWM. The proposed control scheme is also tested under fault conditions and is finally applied in a Field Oriented Control (FOC) of a permanent magnet synchronous machine (PMSM), in order to evaluate its performance in electrical drives applications.
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    Electron beam effects on amorphous molybdenum oxide nanostructures grown by condensation in hydrogen
    (2008) Díaz Droguett, Donovan Enrique; Fuenzalida, V.M.; Diaz-Espinoza, M.S.; Solorzano, G.
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    Enabling Solutions for 28nm CMOS Advanced Junction Formation
    (2010) Li, C.I.; Kuo, P.; Lai, H.H.; Ma, K.; Liu, R.; Wu, H.H.; Chan, M.; Yang, C.L.; Wu, J.Y.; Arévalo, Edward; Guo, B.N.; Colombeau, B.; Thirumal, T.; Toh, T.; Shim, K.H.; Sun, H.L.; Wu, T.; Lu, S.
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    High brightness EUV light sources for actinic metrology
    (2010) Choi, P.; Zakharov, S.V.; Aliaga R., Raúl; Bakouboula, A.; Bastide, J.; Benali, O.; Bove, P.; Cau, M.; Duffy, G.; Kezzar, W.; Lebert, B.; Powell, K.
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    Implementation of a Power Hardware In-The-Loop Platform Using the Damping Impedance Method
    (IEEE, 2020) Chaparro Pérez, Felipe Antonio; Pereda Torres, Javier Eduardo
    This paper presents the practical implementation of a PHIL simulation platform using the damping impedance method. To be successful this requires the identification of the impedance of the hardware under test. We use an identification strategy based on spectral analysis, to obtain a non-parametric identification of the HUT's impedance, followed by a fitting routine that obtains a parametric representation of it. The PHIL platform is then simulated to test the identification routine with passive and active HUTs. Implementation of the PHIL platform is done in a multi-core real-time target, allowing for the electrical simulation and identification routine to run in parallel, on the same device. Experimental verification of the simulated scenarios is performed. A fundamental difference between the identification of passive and active HUTs is found and strategies on how to cope with it are proposed and implemented. Finally, recommendations are given about the realisation of further PHIL simulations with the platform.
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    Implementation of moiré-schlieren deflectometry on a small scale fast capillary plasma discharge
    (2012) Valenzuela Ahumada, Julio César; Wyndham, Edmund; Chuaqui, Hernán; Cortes, D.S.; Favre Domínguez, Mario; Bhuyan, Heman
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    Inductor design for a High performance DC-DC Modular Multilevel Converter
    (IEEE, 2019) Cerda, Carlos; Rojas, Félix; Cristian Andres, Pineda Fornerod; Pereda Torres, Javier Eduardo; Diaz, Matias; Salgado, Jordan; Droguett, Gabriel; Valdés, Darío; Gatica, Gustavo
    In this paper is presented a simple method to design an inductor for high performance on a DC-DC Modular Multilevel Converter(MMC). This element is one of the main limitations for a proper fulfilment. A high-frequency inductor for high power applications is a key element to achieve high efficiency in such type of converters. The theoretical design of the inductor is compared with an experimental prototype, which is then implemented in a high-power DC-DC converter. Experimental results validate the accuracy of the theoretical design and the improvements in the efficiency of the overall DC-DC high power converter.
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    Modelling and Validation of two Heat and Mass Transfer Model of Living Walls and Evaluation of Their Impact on the Energy Performance of a Supermarket in a Semiarid Climate
    (International Building Performance Simulation Association - IBPSA, 2020) Garcia Zulch, Mauricio Alejandro; Vera Araya, Sergio Eduardo; Rouault, Fabien Guillaume Henri Roger; Bustamante Gómez, Waldo; CEDEUS (Chile)
    There are about 35 heat and mass transfer green roof models up to date. However, there are only four living wall models. Furthermore, there are very few studies on the impact of living walls on the building energy performance of buildings. Moreover, none of the living wall models has been validated under semiarid climate conditions and there is a lack of studies about the cooling potential of living walls in retail buildings such as supermarkets. This paper aims to adapt two well-known green roof models to be able to model the heat and mass transfer through living walls, validate both models under semiarid climate conditions, and couple both adapted and validated models to EnergyPlus. Therefore, the impact of living walls on the energy performance of an ASHRAE prototype supermarket located in Santiago of Chile is evaluated. The results show that living walls can reduce up to 24% the cooling loads of a supermarket, and the wall thermal insulation significantly diminishes the impact of the living wall.
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    Modular Multilevel Converter with Inductor Parallel Branch Providing Integrated Partially Rated Energy Storage
    (2021) Neira, Sebastian; Blatsi, Zoe; Judge, Paul; Merlin, Michael; Pereda Torres, Javier
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    Optimal Switching Sequence Direct Power Control for AC/DC Converters with Enhanced Converter Model for Lower Switching Frequencies
    (2022) Poblete, Pablo; Syasegov, Yaroslav Y.; Farhangi, Majid; Aguilera, Ricardo P.; Siwakoti, Yam P.; Lu, Dylan; Pereda Torres, Javier
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    Physical modelling of diversion works for the aysén hydroelectric project Chile
    (2010) Gonzalez, Ricardo; Cienfuegos Carrasco, Rodrigo Alberto; Fernandez J., Bonifacio; Bravo, Jorge; Costas, Carlos; Garces, Octavio
    The Aysen Hydroelectric Project considers the construction of 5 dams in the Baker and Pascua rivers in the southernmost part of Chile. Both rivers in the project area are characterized by narrow valleys, high slopes (> 1% -2%) and large streamflows that range between 600 and 800 m3/s during the low flow season. In order to study the diversion of the rivers, two scaled physical hydraulic models (1:70 for the Baker river and 1:60 for the Pascua river) were built at the Hydraulic Laboratory of the Pontificia Universidad Catolica de Chile to test different methods for cofferdam construction. In this study, we investigate the use of a combination of precast concrete elements such as cubes, tetracubes and tetrapods, along with the use of graduated soil and rock fills to produce a semiimpervious cofferdam. This report presents a summary of the experimental work conducted in the physical models, focusing on the final adopted solution which considers the use of 30 t tetrapods and graduated soil and rock fills to achieve impermeability of the cofferdams.