Envíos recientes

  • Robust multisampled capacitor voltage active damping for grid-connected power converters 

    Samanes Pascual, Javier; Urtasun Erburu, Andoni Upna; Gubía Villabona, Eugenio Upna; Petri, Alberto (Elsevier, 2019)   Artículo / Artikulua
    The derivative feedback of the capacitor voltage is one of the most extended active damping strategies, used to eliminate stability problems in grid-connected power converters with an LCL filter. This strategy is equivalent ...
  • Parameter-independent control for battery chargers based on virtual impedance emulation 

    Urtasun Erburu, Andoni Upna; Berrueta Irigoyen, Alberto; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2018)   Artículo / Artikulua
    An effective battery voltage regulation is fundamental to extend battery lifetime and to avoid overvoltage. However, the design of this regulation is complicated due to the wide battery impedance range, which, when dealing ...
  • A comprehensive model for lithium-ion batteries: from the physical principles to an electrical model 

    Berrueta Irigoyen, Alberto; Urtasun Erburu, Andoni Upna; Ursúa Rubio, Alfredo Upna; Sanchís Gúrpide, Pablo Upna (Elsevier, 2018)   Artículo / Artikulua
    The growing interest in e-mobility and the increasing installation of renewable energy-based systems are leading to rapid improvements in lithium-ion batteries. In this context, battery manufacturers and engineers require ...
  • Rectangular waveguide filters with meandered topology 

    Teberio Berdún, Fernando Upna; Percaz Ciriza, Jon Mikel Upna; Arregui Padilla, Iván Upna; Martín Iglesias, Petronilo; Lopetegui Beregaña, José María Upna; Gómez Laso, Miguel Ángel Upna; Arnedo Gil, Israel Upna (IEEE, 2018)   Artículo / Artikulua
    In this paper, a new topology for rectangular waveguide bandpass and low-pass filters is presented. A simple, accurate, and robust design technique for these novel meandered waveguide filters is provided. The proposed ...
  • State-of-charge-based droop control for stand-alone AC supply systems with distributed energy storage 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
    The droop method is an advantageous technique for stand-alone AC supply systems, allowing for power sharing among various inverters with no need for communication cables. However, in stand-alone systems with multiple ...
  • Control of a single-switch two-input buck converter for MPPT of two PV strings 

    Urtasun Erburu, Andoni Upna; Dah-Chuan Lu, Dylan (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    In this paper, the Two-Input Buck (TIBuck) converter is proposed as the DC/DC stage for photovoltaic (PV) cascaded converters. This converter is attractive for this application because it is cost-effective and reliable and ...
  • High frequency power transformers with foil windings: maximum interleaving and optimal design 

    Barrios Rípodas, Ernesto Upna; Urtasun Erburu, Andoni Upna; Ursúa Rubio, Alfredo Upna; Marroyo Palomo, Luis Upna; Sanchís Gúrpide, Pablo Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    Foil conductors and primary and secondary interleaving are normally used to minimize winding losses in high frequency transformers used for high-current power applications. However, winding interleaving complicates the ...
  • Frequency-based energy management strategy for stand-alone systems with distributed battery storage 

    Urtasun Erburu, Andoni Upna; Barrios Rípodas, Ernesto Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    Distributed generation is an attractive solution for stand-alone AC supply systems. In such systems, the installation of two or more energy-storage units is recommended for system redundancy and may also be required when ...
  • Energy management strategy for a battery-diesel stand-alone system with distributed PV generation based on grid frequency modulation 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Barricarte Rivas, David; Marroyo Palomo, Luis Upna (Elsevier, 2014)   Artículo / Artikulua  OpenAccess
    A hybrid PV-Battery-Diesel configuration is very attractive for stand-alone systems in terms of cost and reliability. In many applications, the battery and the diesel generator are centralized and generate the AC grid while ...
  • Small wind turbines sensorless MPPT: robustness analysis and lossless approach 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2014)   Artículo / Artikulua  OpenAccess
    The configuration Permanent Magnet Synchronous Generator (PMSG) with diode bridge is frequently used in small Wind Energy Conversion Systems (WESC) thanks to its reliability and low cost. In order to perform a sensorless ...
  • Modeling of small wind turbines based on PMSG with diode bridge for sensorless maximum power tracking 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; San Martín Biurrun, Idoia Upna; López Taberna, Jesús; Marroyo Palomo, Luis Upna (Elsevier, 2013)   Artículo / Artikulua  OpenAccess
    The Permanent Magnet Synchronous Generator (PMSG) with diode bridge is frequently used in small Wind Energy Conversion Systems (WECS). This configuration is robust and cheap, and therefore suitable for small WECS. In order ...
  • High sensitivity humidity sensor based on cladding-etched optical fiber and lossy mode resonances 

    Ascorbe Muruzabal, Joaquín Upna; Corres Sanz, Jesús María Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
    In this work a high sensitivity optical fiber humidity sensor (OFHS) is presented. The configuration chosen for this purpose is a cladding-etched single mode optical fiber (CE-SMF) coated with a thin film of tin oxide ...
  • Fabrication of Bragg gratings on the end facet of standard optical fibers by sputtering the same material 

    Ascorbe Muruzabal, Joaquín Upna; Corres Sanz, Jesús María Upna; del Villar, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2016)   Artículo / Artikulua  OpenAccess
    A sputtering process has been applied to deposit quarter-wavelength stacks on the end facet of cleaved optical fibers by using only one sputtering target. Standard multimode optical fibers were used as substrates to fabricate ...
  • Technical and environmental characterization of hydraulic and alkaline binders 

    Espuelas Zuazu, Sandra; Echeverría, Angel María; Marcelino Sádaba, Sara; Prieto Cobo, Eduardo; Seco Meneses, Andrés (Elsevier, 2018)   Artículo / Artikulua
    Portland cement is a widely used binder in construction and building applications because of its good properties. Despite its convenience as construction material, the social demands and policies trends are requesting a ...
  • Adaptive voltage control of the DC/DC boost stage in PV converters with small input capacitor 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2013)   Artículo / Artikulua  OpenAccess
    In the case of photovoltaic (PV) systems, an adequate PV voltage regulation is fundamental in order to both maximize and limit the power. For this purpose, a large input capacitor has traditionally been used. However, when ...
  • Network centrality and organizational aspirations: a behavioral interaction in the context of international strategic alliances 

    Shijaku, Elio; Larraza Kintana, Martín Upna; Urtasun Alonso, Ainhoa Upna (Palgrave Macmillan UK, 2018)   Artículo / Artikulua
    Considerando que el análisis de redes sociales ha estado asociado con aspiraciones organizacionales, poco es conocido sobre cómo el posicionamiento estructural de la empresa y particularmente la centralidad de la red afecta ...
  • Sampling stratification using aerial imagery to estimate fruit load in peach tree orchards 

    Miranda Jiménez, Carlos Upna; Santesteban García, Gonzaga Upna; Urrestarazu Vidart, Jorge; Loidi Erviti, Maite; Royo Díaz, José Bernardo Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    A quick and accurate sampling method for determining yield in peach orchards could lead to better crop management decisions, more accurate insurance claim adjustment, and reduced expenses for the insurance industry. Given ...
  • Investigar es mirar lo que todos ven pero pensándolo de una manera diferente 

    López-Goñi, José Javier Upna (Asociación Proyecto Hombre, 2018)   Artículo / Artikulua  OpenAccess
    En este artículo se presentan los principales resultados de una línea de investigación que comenzó hace varios años el grupo de investigación en Psicología Clínica y Psicopatología de la Universidad Pública de Navarra en ...
  • Dissolved solids and suspended sediment dynamics from five small agricultural watersheds in Navarre, Spain: a 10-year study 

    Merchán Elena, Daniel Upna; Luquin Oroz, Eduardo Adrián; Hernández García, Iker; Campo Bescós, Miguel Ángel Upna; Giménez Díaz, Rafael Upna; Casalí Sarasíbar, Javier Upna; Valle de Lersundi, Jokin del (Elsevier, 2019)   Artículo / Artikulua
    Dissolved solids (DS) and suspended sediment (SS) loads are considered relevant environmental problems. They are related to a wide range of on-site and off-site impacts, such as soil erosion or salinization of water bodies. ...
  • Study and optimization of self-assembled polymeric multilayer structures with neutral red for pH sensing applications 

    Goicoechea Fernández, Javier Upna; Arregui San Martín, Francisco Javier Upna; Corres Sanz, Jesús María Upna; Matías Maestro, Ignacio Upna (Hindawi / Wiley, 2008)   Artículo / Artikulua  OpenAccess
    The characterization of nanostructured thin films is critical in the design and fabrication of optical sensors. Particularly, this work is a detailed study of the properties of layer-by-layer electrostatic self-assembled ...

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