Browsing by Author "Verdugo, Diego"

Now showing 1 - 5 of 5
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    A Modular Solid State Transformer for Future Hybrid Distribution Networks
    (2021) Lillo, Jonathan; Verdugo, Diego; Rojas, Felix; Azharuddin, Mohammed; Pereda Torres, Javier
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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, Felix; Azharuddin, Mohammed; Pereda Torres, Javier
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    Dynamic DC-Link Voltage Control of Back to Back Modular Multilevel Converter for Drive Applications
    (IEEE, 2019) Lillo, Jonathan; Rojas, Félix; Verdugo, Diego; Dí­az, Matias; Pereda Torres, Javier Eduardo; Gatica, Gustavo; Espinoza, Mauricio
    In this work a dynamic control of the dc-link voltage in a hybrid Back-to-Back (BtB) Modular Multilevel Converter for medium-voltage drive applications is presented. The proposed control scheme relates the speed of the machine with the dc-link voltage magnitude to reduce the large circulating currents and common-mode voltage of the converter when the machine operates at low speed. Simulation results, performed in the software PLECS, validate the model of the BtB converter and the proposed control scheme, reducing circulating currents and common mode voltage in almost 70% and 60% respectively, when the machine operates at very low speed.
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    Modelling and control of a multi-cell converter based on Input-Parallel Output-Parallel bridge-cells with discontinuous interleaved modulation
    (2021) Verdugo, Diego; Rojas, Felix; Pereda Torres, Javier; Diaz, Matias; Gatica, Gustavo
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    Socioeconomic inequalities in self-perceived oral health among adults in Chile
    (2017) Gallego Yáñez, Francisco; Larroulet, Cristián; Palomer Roggerone, Leonor; Repetto, Andrea; Verdugo, Diego
    Abstract Background This paper studies the socioeconomic disparities in self-perceived oral health among Chilean adults and in the perceived physical, functional, psychological and social consequences of oral health. Methods In February 2011, 1,413 residents of Metropolitan Area of Santiago, Chile, were interviewed using a standardized questionnaire and examined by dentists for dental status and oral health conditions. Only adults 18 to 60 years old affiliated with the public healthcare system were eligible to participate. We estimate socioeconomic gradients in self-perceived oral health and its distinct dimensions. We use the Heckman two-step procedure to control for selection bias given the non-random nature of the sample. In addition, we use a two-equation ordered response model given the discrete nature of the dependent variable. Results There is a non-linear socioeconomic gradient in self-perceived oral health even after controlling for oral health status. The gradient is steep at the lower end of the income distribution and constant at mid-income levels. These socioeconomic disparities are also found for the psychological and social dimensions of self-perceived oral health, but not for the functional limitations and physical pain dimensions. Conclusions The findings are consistent with inequities in the access to oral health services due to insufficient provision in the public sector and costly options in the private sector.