Now showing items 1-11 of 11

    • Análisis del control de la corriente de red y del convertidor en un inversor conectado a red mediante filtro LCL 

      Baines García, Álvaro (2020)   Trabajo Fin de Máster/Master Amaierako Lana  OpenAccess
      En este proyectose ha realizado una comparativa del control de corriente de red y el control de corriente del convertidor en un inversor conectado a red mediante filtro LCL.Utilizando un control PI escalar y vectorial, ...
    • Avoiding the order reduction when solving second-order in time PDEs with Fractional Step Runge–Kutta–Nyström methods 

      Moreta, M. Jesús; Bujanda Cirauqui, Blanca Upna; Jorge Ulecia, Juan Carlos Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      We study some of the main features of Fractional Step Runge–Kutta–Nyström methods when they are used to integrate Initial–Boundary Value Problems of second order in time, in combination with a suitable spatial discretization. ...
    • Estrategias de control de inversores trifásicos en modo tensión para contribuir a la estabilidad de red 

      Muguiro Mariñelarena, Mikel (2020)   Trabajo Fin de Grado/Gradu Amaierako Lana
      El camino que han seguido las renovables para ganarse un puesto en el mercado de la generación de energía eléctrica no ha sido fácil, y todavía falta mucho por hacer. Actualmente se enfrentan a dos grandes retos. Por un ...
    • Evolution of metakaolin thermal and chemical activation from natural kaolin 

      Sánchez, Isabel; Soto García, Isabel Sonsoles de Upna; Casas, Marina; Vigil de la Villa, Raquel; García Giménez, Rosario (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      In the present paper, we study the combined effect of thermal activation (600 °C/2 h and 750 °C/2 h) and chemical activation with 1% ZnO on the reactivity of metakaolinite (MK) obtained from natural kaolin. The phases are ...
    • Herramienta de sintonización avanzada de lazos de control 

      Villegas Baztán, Raquel (2016)   Trabajo Fin de Máster/Master Amaierako Lana
      Las redes a las que se conectan los aerogeneradores son muy complejas y es común que aparezcan problemas de estabilidad al conectar a ellas los convertidores electrónicos de potencia. Por ello, es importante caracterizar ...
    • Modified Douglas splitting methods for reaction–diffusion equations 

      Arrarás Ventura, Andrés Upna; Hout, K. J. in ’t; Hundsdorfer, W.; Portero Egea, Laura Upna (Springer, 2017)   Artículo / Artikulua  OpenAccess
      We present modifications of the second-order Douglas stabilizing corrections method, which is a splitting method based on the implicit trapezoidal rule. Inclusion of an explicit term in a forward Euler way is straightforward, ...
    • New third order low-storage SSP explicit Runge-Kutta methods 

      Higueras Sanz, Inmaculada Upna; Roldán Marrodán, Teodoro Upna (Springer, 2019)   Artículo / Artikulua  OpenAccess
      When a high dimension system of ordinary differential equations is solved numerically, the computer memory capacity may be exhausted. Thus, for such systems, it is important to incorporate low memory usage to some other ...
    • 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 ...
    • On the stability of advanced power electronic converters: the Generalized Bode Criterion 

      Lumbreras Magallón, David Upna; Barrios Rípodas, Ernesto Upna; Urtasun Erburu, Andoni Upna; Ursúa Rubio, Alfredo Upna; Marroyo Palomo, Luis Upna; Sanchis Gúrpide, Pablo Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      A key factor in the design of power electronic converters is the development of control systems and, in particular, the determination of their stability. Due to ease of application, the Bode criteria are currently the most ...
    • 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 ...
    • Stability of phenolic compounds in grape stem extracts 

      Esparza Catalán, Irene Upna; Cimminelli, María José Upna; Moler Cuiral, José Antonio Upna; Jiménez Moreno, Nerea Upna; Ancín Azpilicueta, Carmen Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Grape stem is rich in phenolic compounds, especially stilbenes. These antioxidants can be degraded during the storage of grape stem extracts for long periods of time. The aim of this work was to analyze the stability of ...