Enviaments recents

  • Control and operation of wind power plants connected to DC grids 

    Schönleber, Kevin (Universitat Politècnica de Catalunya, 2018-02-09)
    Tesi
    Accés obert
    Remote offshore wind power plants (WPPs) are being linked through high-voltage de voltage-source converter (VSC-HVdc) transmission to the main grids. The current deployments of HVdc grid connections for offshore WPPs are ...
  • Operation of HVDC converters for transformer inrush current reduction 

    Solh Joukhah, Zahra (Universitat Politècnica de Catalunya, 2017-10-27)
    Tesi
    Accés obert
    The present PhD thesis deals with transformer inrush current in offshore grids including offshore wind farms and High Voltage Direct Current (HVDC) transmission systems. The inrush phenomenon during transformers energization ...
  • Impact of solar PV plants with synchronous power controllers on power system stability 

    Remón Rodríguez, Daniel (Universitat Politècnica de Catalunya, 2017-12-19)
    Tesi
    Accés obert
    The irruption of renewable energy sources with power electronics interfaces is transforming power systems. To minimize the possible adverse effects that these generating systems may have on the power grid, transmission ...
  • Offshore grid control of voltage source converters for integrating offshore wind power plants 

    Raza, Muhammad (Universitat Politècnica de Catalunya, 2017-12-13)
    Tesi
    Accés obert
    The offshore grid in North and Baltic Sea can help Europe to achieve 2020 and 2030 renewable energy target to counter climate changes . The formation of offshore grid requires the interconnection between several offshore ...
  • Direct current control for grid connected multilevel inverters 

    Schaefer, Markus (Universitat Politècnica de Catalunya, 2017-11-08)
    Tesi
    Accés obert
    Control schemes for inverters of different topologies and various numbers of voltage levels are of great interest for many standard as well as special applications. This thesis describes a novel, robust and high-dynamic ...
  • Estudio y caracterización armónica de las lámparas fluorescentes compactas de baja potencia 

    Cunill Solà, Jordi (Universitat Politècnica de Catalunya, 2018-01-30)
    Tesi
    Accés obert
    This Doctoral Thesis is framed within the generic issue of power quality and more specifically in the study and harmonic characterization of low power compact fluorescent lamps (CLFs) with integrated ballast, also called ...
  • Advanced modeling of solid state transformer 

    Adabi Firouzjaee, Mohammad Ebrahim (Universitat Politècnica de Catalunya, 2018-01-25)
    Tesi
    Accés obert
    The solid state transformer (SST) is seen as a proper replacement of the conventional iron-and-copper transformer in the future smart grid . The SST offers several benefits (e.g. enhanced power quality performance or ...
  • Anàlisi experimental de la problemàtica de càrrega-descàrrega de ACEE aplicables en transports 

    Garrigosa i Garcia, Ramón (Universitat Politècnica de Catalunya, 2017-09-15)
    Tesi
    Accés obert
    lt's a well-known fact that the flywheel stores energy inside, and this energy is proportional to the rotational speed and the moment of inertia. lf the moment of inertia increases, the energy increases in the same proportion ...
  • Stand-alone hybrid renewable energy systems (HRES) 

    Martínez Díaz, Maria del Mar (Universitat Politècnica de Catalunya, 2017-07-14)
    Tesi
    Accés obert
    End of Energy Poverty and achieving Sustainable Energy for all by 2030 is a universal challenge. 1.3 billion people without energy access and 2.8 billion people using unsustainable solid fuel for cooking and heating are ...
  • High frequency modeling of power transformers under transients 

    Imdad, Kashif (Universitat Politècnica de Catalunya, 2017-07-17)
    Tesi
    Accés obert
    This thesis presents the results related to high frequency modeling of power transformers. First, a 25kVA distribution transformer under lightning surges is tested in the laboratory and its high frequency model is proposed. ...
  • Control of grid connected power converters with grid support functionalities 

    Zhang, Weiyi (Universitat Politècnica de Catalunya, 2017-06-01)
    Tesi
    Accés obert
    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)
    Tesi
    Accés obert
    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 ...

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