Artículos de conferencia

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Browsing Artículos de conferencia by browse.metadata.fuente "SRIA"

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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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    Board 119: Pre-engineering Programs and the Instillment of Empowering Abilities for Minorities: the Case of the SaviaLab Program
    (2019) Miranda Mendoza, Constanza; Goñi, Julian; Fuenzalida Quilodrán, Hellen Massiel
    This is a Work in Progress. In this article, we will seek to present one of the few exemplars in Chile that can be considered a pre-engineering program. The national program of Savialab. Savialab just recently won the GEDC Diversity Award granted by Airbus and the Engineering Deans Council. We’ll briefly present Savialab’s methodology and describe its participants. Finally, we’ll describe our ongoing research methodology proposed to evaluate the programs impact as a genuine pre-engineering program. STEM study programs have become increasingly relevant in modern societies as they’re considered vehicles for economic and social development. Nonetheless, one of the major concerns in STEM education is the lack of adequate representation of minorities groups in these programs. Examples of this are women, low-income, rural or first-generation students, and ethnic minorities and other social identities typically underrepresented in STEM. To overcome these challenges, many public and private initiatives have been deployed. Among these, engineering schools in the US have developed educational programs to instill engineering abilities in pre-college students. These programs have been called pre-engineering programs. Although there are a significant number of articles showing the positive impact of pre-engineering, there is still concern about the lack of standards in instructional designs. In spite of the fact that ‘pre-engineering’ as a concept is becoming more broadly employed in the US, it hasn’t really reached popularity in Latin America, nor in Chile in particular
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    Developing a More Comprehensive Instrument to Assess the Entrepreneurial Mindset of Engineering Students
    (ASEE's Virtual conference, 2020) Miranda Mendoza, Constanza; Goñi, Julian; Berhane, Bruk T.; Sotomayor, Trinidad
    This is a Work in Progress: Goals of becoming more entrepreneurial have placed considerable pressure on institutions of higher education to generate educational programs that are consistent with the entrepreneurial mindset. Surpassing business programs, engineering education has had an exponential growth in entrepreneurship instruction in curricula and publications related to the topic. However, there are still many conceptual and methodological challenges described in recent literature left unresolved by current assessment methods. As an international and interdisciplinary research team, we seek to develop a new survey instrument to assess the entrepreneurial mindset in engineering students. In the next two years, a preliminary quantitative version of the instrument will be applied to an incrementally larger body of Chilean and United States students in order to evaluate its utility across a much larger sample size. Through this research effort and a critical review of the literature, we aim to produce a more comprehensive and situated method for defining and articulating the entrepreneurial mindset for stakeholders in engineering education. Long-term implications for this project include alignment of the entrepreneurial mindset with objectives articulated by the Accreditation Board for Engineering and Technology (ABET)
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    Interacting stellar winds: clump formation and accretion onto Sgr A*
    (2018) Calderón Espinoza, Diego Nicolás; Schartmann, Marc; Burkert, . Andreas; Cuadra, Jorge
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    Sequential Phase-Shifted Model Predictive Control for a Multilevel Converter with Integrated Battery Energy Storage
    (2020) Neira, Sebastián; Poblete, Pablo; Cuzmar Leiva, Rodrigo Hernán; Pereda Torres, Javier Eduardo; Aguilera, Ricardo P.
    Cascaded converters have risen as a suitable solution for the connection of Utility-scale Battery Energy Storage Systems (BESS) to the grid. These converters allow to split the battery array into the power modules, reducing the total series-connected battery cells and improving the reliability of the system. Different types of modules have been proposed to integrate the batteries in the converter. The three-port full-bridge module connects the batteries through a second deport decoupled from the harmful low-frequency oscillations and current peaks. However, the multi-variable controller required to manage the power interaction between the battery and the grid presents a challenge in terms of computational burden and scalability. This work proposes the use of the Sequential Phase-Shifted Model Predictive Control (PS-MPC) in a multilevel BESS implementation using three-port full-bridge modules. The proposed controller outperforms a standard FCS-MPC, as it obtains the optimal duty cycles for the operation of the converter with the same fast dynamic response, but also with the fixed spectrum of the PS-PWM and low computational burden, which facilitates its scalability to multilevel BESS with a large number of cells. Simulation results show the ability of the system to exchange different amounts of power with the grid, ensuring the best battery operational conditions
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    Use of Different Complex Fenestration Systems in Office Spaces in Chile : Analysis of the Energy Consumption and Visual Comfort of Occupants at the Early Stages of Their Design Process
    (IOP Science, 2020) Bustamante Gómez, Waldo; Molina, Germán; Uribe, Daniel; Vera Araya, Sergio Eduardo
    Office buildings around the world are mostly designed with high window-towall (WWR) facades, regardless of the type of climate where they are located. Chile, a country with a high climate diversity from north to south and from the coast to the Andes, is no exception to this situation. In order to improve the thermal and visual performance of office buildings, it has been shown that complex fenestration systems (SFC), which include an external solar protection system, are effective to control the incident solar radiation and lighting transmission. However, the effectiveness of these systems depends to a large extent on an appropriate CFS design. Some studies of office buildings in Chile show that a high percentage of CFS has not been designed correctly. To support the early stages of the design process of office buildings in Chile and to assist in the design of solar protection systems as part of a CFS, oficity, an easy-to-use tool was designed. In an office space and considering different facades of solar protection systems, the tool allows the development of simultaneous simulations of its total energy consumption (heating, cooling, and artificial lighting), together with the evaluation of the occupants’ visual comfort. The tool performs the simulations in just a few seconds, which makes it appropriate to support the preliminary stages of the building's design process. The tool is compatible with PCs, smartphones, and tablets. The back end of oficity uses EnergyPlus for annual energy simulation and Radiance for annual lighting simulation. The use of these validated software makes the results of the simulations highly reliable. The tool considers 23 different climates of Chile. This research shows the analysis of an office space in different cities of the country, with variations in its orientation and the protection systems that are recommended for different climates