Recent Submissions

  • DC capacitance reduction in three-phase photovoltaic inverters by using virtual impedance emulation 

    Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    DC voltage regulation in grid-connected three-phase PV inverters is a fundamental requirement. In order to reduce the influence of the PV non-linear behavior and ensure stability in the whole operating range, the input ...
  • Single feedback regulation of the AC voltage for high-power inverters under stand-alone operation 

    Erdocia Zabala, Ioseba; Urtasun Erburu, Andoni Upna; Marroyo Palomo, Luis Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    Energy-storage inverters under stand-alone operation must control the output voltage. However, existing methods for instantaneous voltage regulation are not suitable for high-power inverters due to their limited sampling ...
  • Influence of recording technology on the determination of binaural psychoacoustic indicators in soundscape investigations 

    San Martín Murugarren, Ricardo Upna; Arana Burgui, Miguel Upna; Ezcurra Guisasola, María Amaya; Valencia Leoz, Ana (Institute of Noise Control Engineering, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    The evaluation of soundscapes is mainly carried out through field surveys, using soundwalking methodologies. Through rating scales and annotation of comments, the experiences and expectations of the participants are ...
  • An efficient algorithm for the evaluation of tonality and the determination of the tonal frequency according to IEC 61400-11 

    Arana Burgui, Miguel Upna; San Martín Murugarren, Ricardo Upna; Ezcurra Guisasola, María Amaya; Valencia Leoz, Ana; Llorente, Elena (Institute of Noise Control Engineering, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    The terms of tonality and tonal audibility of the noise emitted by wind turbines are defined and described in the standard IEC 61400-11. The procedure for tonality assessment at different wind speeds based on the narrowband ...
  • OWA operators based on admissible permutations 

    Paternain Dallo, Daniel Upna; Jin, LeSheng; Mesiar, Radko; Vavríková, Lucia; Bustince Sola, Humberto Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    In this work we propose a new OWA operator defined on bounded convex posets of a vector-lattice. In order to overcome the non-existence of a total order, which is necessary to obtain a non-decreasing arrangement of the ...
  • Comparison of fourth-harmonic and combined doubler/subharmonic mixer with integrated MMIC based local oscillator 

    Pérez Escudero, José Manuel Upna; Quemada Mayoral, Carlos Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    In this paper a comparison between a fourth harmonic mixer and a combined doubler/subharmonic mixer based on Schottky diodes working at 300 GHz with MMIC Local Oscillator (LO) integrated in a single enclosing is presented. ...
  • On the requirements of the power converter for second-life lithium-ion batteries 

    Berrueta Irigoyen, Alberto Upna; San Martín Biurrun, Idoia Upna; Pascual Miqueleiz, Julio María Upna; Sanchís Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The use of lithium-ion batteries is increasing year after year, especially in the automotive sector. Given the high requirements of electric vehicles, their energy storage systems are discarded when they still have around ...
  • Active damping based on the capacitor voltage positive-feedback for grid-connected power converters with LCL filter 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The capacitor voltage positive-feedback is a widely extended active damping strategy. It can effectively damp the LCL output filter resonant poles for low ratios of resonance to sampling frequencies. However, the existing ...
  • The generalized bode criterion: application to the dc voltage control of a three-phase photovoltaic grid-tied inverter 

    Lumbreras Magallón, David Upna; Barrios Rípodas, Ernesto Upna; Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    As renewable energies are becoming more important in the electrical generation system, power electronic converters are facing new design issues related not only to their components but also to their control loops. In this ...
  • Addressing the issue of trust in elementary teachers' Maths-specific education: ANFoMAM project 

    Celi, Valentina; Cogolludo, José Ignacio; Gil Clemente, Elena; Lizasoain Iriso, María Inmaculada Upna; Gasca Millán, Ana; Moler Cuiral, José Antonio Upna; Regoliosi, Luig (Charles University (Chequia), 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    To improve primary school teachers' maths-specific education at university, our project will develop a series of workshops, as ready-to-use instruments, which closely consider children's way of learning and their relationship ...
  • Silicon-based 0.450-0.475 THz series-fed double dielectric resonator on-chip antenna array based on metamaterial properties for integrated-circuits 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The antenna array designed to operate over 0.450-0.475 Terahertz comprises two dielectric resonators (DRs) that are stacked vertically on top of each other and placed on the surface of the slot antenna fabricated on a ...
  • Do we still need fuzzy classifiers for Small Data in the Era of Big Data? 

    Elkano Ilintxeta, Mikel Upna; Bustince Sola, Humberto Upna; Galar Idoate, Mikel Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The Era of Big Data has forced researchers to explore new distributed solutions for building fuzzy classifiers, which often introduce approximation errors or make strong assumptions to reduce computational and memory ...
  • Super-resolution for Sentinel-2 images 

    Galar Idoate, Mikel Upna; Sesma Redín, Rubén; Ayala, C.; Aranda, C. (International Society for Photogrammetry and Remote Sensing, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Obtaining Sentinel-2 imagery of higher spatial resolution than the native bands while ensuring that output imagery preserves the original radiometry has become a key issue since the deployment of Sentinel-2 satellites. ...
  • MIMO based decoupling strategy for grid connected power converters controlled in the synchronous reference frame 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna; López Taberna, Jesús (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Power converters are frequently connected to the grid through a LCL filter, controlling its power transfer through a current control loop in the synchronous reference frame. In this reference frame, cross coupling terms ...
  • Modeling solar cavity receivers: a review and comparison of natural convection heat loss correlations 

    Samanes Pascual, Javier Upna; García-Barberena Labiano, Javier; Zaversky, Fritz (Elsevier, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    As the main difficulty of modeling cavity receivers is determining natural convection heat losses, this paper presents a survey of the different natural convection correlations developed by several authors to model natural ...
  • Multisampled-capacitor-voltage active damping for parallel interleaved grid connected voltage source converters with LCL filter 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Parallel interleaved converters for high power renewable energy systems present stability issues at the LCL resonance frequency. A multisampled measurement and filtering strategy is proposed to stabilize the system based ...
  • On the limits of the capacitor-voltage active damping for grid-connected power converters with LCL filter 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Active damping strategies are widely extended to avoid stability issues at the LCL filter resonant poles in grid-connected voltage source converters. The capacitor voltage derivative active damping effectively damps the ...
  • Sensorless active damping strategy for parallel interleaved voltage source power converters with LCL filter 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Grid-connected pulse-width modulation converters with LCL filters are widely extended as an interface for renewable energy generating systems. Those filters arise stability issues due to the filter resonance, which, must ...
  • Langile publikoen Lan Bizitzaren Kalitatea (LBK) 

    Gastearena Balda, María Lourdes; Ollo López, Andrea Upna; Larraza Kintana, Martín Upna (Udako Euskal Unibertsitatea, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Lan honen helburua da aztertzea zein diren determinatzaileaklangile publiko eta pribatuen Laneko Bizitzaren Kalitatea (LBK), ikusteko diferentziak ote dauden, eta ikusteko, halaber, kontratu finkoa edo behin-behinekoa ...
  • Integrated music and math projects in secondary education 

    Wilhelmi, Miguel R.; Montiel, Mariana (Springer, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The introduction of projects involving music and mathematics in Secondary Education should allow the integration of these disciplines by nonspecialists. In the present work we describe an experience carried out with ...

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