Recent Submissions

  • Control of grid connected power converters with grid support functionalities 

    Zhang, Weiyi (Universitat Politècnica de Catalunya, 2017-06-01)
    Doctoral thesis
    Open Access
    The installation of power generation systems based on renewable energy sources has been increasing exponentially over the last decades. However, in spite of the well-known merits of such energy sources, the expansion of ...
  • Ultra-low power circuits based on tunnel FETs for energy harvesting applications 

    Cavalheiro, David (Universitat Politècnica de Catalunya, 2017-05-19)
    Doctoral thesis
    Open Access
    There has been a tremendous evolution in integrated circuit technology in the past decades. With the scaling of complementary metal-oxide-semiconductor (CMOS) transistors, faster, less power consuming and more complex chips ...
  • Modular multilevel converters for power system applications 

    Ferreira, Abel António de Azevedo (Universitat Politècnica de Catalunya, 2017-03-31)
    Doctoral thesis
    Open Access
    This thesis discusses the operation of the grid-tied modular multilevel converters (MMC) applied on the dc power transmission, particularly on the medium and high-voltage applications. First, it is presented the evolution ...
  • Control contributions to AC microgrid inverters 

    Heredero Peris, Daniel (Universitat Politècnica de Catalunya, 2017-03-24)
    Doctoral thesis
    Open Access
    This thesis is focused on the microgrid control framework. Specifically, it is concentrated on alternative current microgrids. As a result of the author involvement in different industrial projects concerning microgrids ...
  • Desarrollo de herramientas constructivistas para la publicación y personalización de contenidos de cursos en línea 

    García Fernández, Javier, 1973 (Universitat Politècnica de Catalunya, 2016-01-11)
    Doctoral thesis
    Open Access
    Since early times in internet, there have been training experiences with different success. Sometimes because they were complicated to use, others for the state of technology, or because the public has not supported it. ...
  • Analysis and control of multi–area HVDC interconnected power systems by using virtual inertia 

    Rakhshani, Elyas (Universitat Politècnica de Catalunya, 2016-12-14)
    Doctoral thesis
    Open Access
    Virtual inertia is known as an inevitable part of the modern power systems. Recent trend of research is oriented in different methods of emulating virtual inertia in different part of the systems. This dissertation is ...
  • Protection and fault management in active distribution systems 

    Monadi, Mehdi (Universitat Politècnica de Catalunya, 2016-12-14)
    Doctoral thesis
    Open Access
    The integration of renewable energy resources (RES), as a type of distributed generation (OG) units, is increasing in distribution, systems. This integration, changes the topology, performance and the operational aspects ...
  • Development of high-capacity substation connectors compatible with HTLS technology 

    Capelli, Francesca (Universitat Politècnica de Catalunya, 2017-03-16)
    Doctoral thesis
    Open Access
    The advent of HTLS (High Temperature, Low Sag) conductors imposes more severe operating conditions on devices such as substation connectors intended for transmission and distribution systems, which are subjected to higher ...
  • Electromagnetic models for ultrasound image processing 

    Navarrete, Hugo (Universitat Politècnica de Catalunya, 2016-01-29)
    Doctoral thesis
    Open Access
    Speckle noise appears when coherent illumination is employed, as for example Laser, Synthetic Aperture Radar (SAR), Sonar, Magnetic Resonance, X-ray and Ultrasound imagery. Backscattered echoes from the randomly distributed ...
  • Análisis y comparación de algoritmos de un PLL monofásico basados en un filtro paso todo digital 

    Belandria, Luciano Emilio (Universitat Politècnica de Catalunya, 2015-09-18)
    Doctoral thesis
    Open Access
    The phase-locked loop (PLL) is an element of a grid-connected converter system, which provides phase angle and frequency measurements of the grid voltage. The PLL takes care of control the synchronization with the grid ...

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