Now showing items 96-115 of 154

    Feeder flow control and operation in large scale photovoltaic power plants and microgrids : Part I Feeder ow control in large scale photovoltaic power plants : Part II Multi-microgrids and optimal feeder ow operation of microgrids 

    Bullich Massagué, Eduard (Date of defense: 2018-10-04)

    This thesis deals with the integration of photovoltaic energy into the electrical grid. For this purpose, two main approaches can be identified: the interconnection of large scale photovoltaic power plants with the ...

    Filtros activos de potencia para la compensación instantánea de armónicos y energía reactiva. 

    Román Lumbreras, Manuel (Date of defense: 2006-07-19)

    Since the last quarter of the last century, and due to the spectacular increment of the connection of electronic loads to the electric system, it has been extraordinarily increased the existence of non-sinusoidal currents ...

    Flexibility services for distribution network operation 

    Munné Collado, Íngrid (Date of defense: 2021-10-01)

    On the way towards a low carbon electricity system, flexibility has become one of the main sources for achieving it. Flexibility can be understood as the ability of a power system to cope with the variability and uncertainty ...

    From the production of the single cell to the end of life of the battery module: the development of parameter variation of lithium-ion cells 

    Oeser, David (Date of defense: 2022-10-27)

    (English) In lithium-ion batteries, depending on the requirements, many individual cells are connected in series and parallel. Despite very similar individual cell parameters after production, they can develop differently ...

    Hacia el motor superconductor: estudio de las interacciones entre un rotor superconductor y un estator convencional 

    Pallarès Viña, Miquel Joan (Date of defense: 2002-04-22)

    de la tesis:<br/><br/>Hacia el motor superconductor: estudio de las interacciones entre un estator convencional y un rotor superconductor<br/><br/>El desarrollo de superconductores de alta temperatura (HTSC) de gran corriente ...

    Harmonic load flow formulation and numerical resolution 

    Rashid, Asim (Date of defense: 2019-01-17)

    As a continuation of the work done by the QSE (Electrical Supply Quality) research group at the UPC (Polytechnic University of Catalonia) on harmonic load flow in electric power networks, this thesis aims to study existing ...

    High frequency modeling of power transformers under transients 

    Imdad, Kashif (Date of defense: 2017-07-17)

    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. ...

    Impact of solar PV plants with synchronous power controllers on power system stability 

    Remón Rodríguez, Daniel (Date of defense: 2017-12-19)

    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 ...

    Improved control for multilevel inverters in grid applications 

    Hofmann, Martin (Date of defense: 2018-09-27)

    Control systems for three-phase grid connected voltage source inverters (VSI) play an important role in energy transformation systems . They are expected to be stable, robust and accurate during steady state as well as ...

    Induction heating converter's design, control and modeling applied to continuous wire heating 

    Martín Segura, Guillermo (Date of defense: 2012-06-22)

    Induction heating is a heating method for electrically conductive materials that takes advantage of the heat generated by the Eddy currents originated by means of a varying magnetic field. Since Michael Faraday discovered ...

    Investigación de las estructuras eléctricas y líderes de rayos en tormentas : aportaciones a las condiciones de inicio de rayos gamma terrestres 

    López Trujillo, Jesús Alberto (Date of defense: 2019-06-21)

    This thesis presents a characterization of the charge structures of thunderstorms and lightning leader development, and their relationship with the emissions of terrestrial gamma ray flashes (TGFs). The results include a ...

    Large scale battery systems in distribution grids 

    Resch, Matthias (Date of defense: 2019-01-31)

    The increasing integration of renewable energy installations at the distribution grid level has led to a strong increase in grid reinforcement measures in recent years. Since the costs are being passed on to the general ...

    Large scale photovoltaic power plants: configuration, integration and control 

    Cabrera Tobar, Ana Karina (Date of defense: 2018-06-04)

    This thesis focuses on the operation and control of Large Scale Photovoltaic Power Plants (LS-PVPPs) according to grid code requirements with a special focus on the basic unit: the PV generator. The aim of this thesis is ...

    Local electricity markets design and operation in distribution power systems 

    Olivella Rosell, Pol (Date of defense: 2020-01-31)

    In the context of distributed generation growth, local grids could face operational issues. In that sense, smart grid deployment will give information to local grid operators about grid status at medium and low voltage ...

    Localizaciones con impactos de rayos recurrentes : aportación a la distribución geográfica de rayos con corrientes extremas y a la caracterización de rayos que afectan aerogeneradores 

    Solà de las Fuentes, Glòria (Date of defense: 2023-11-03)

    (English) Nowadays, lightning presents a challenge to the proper functioning of an increasingly complex electrical system. One of the most sensitive and exposed to lightning elements are wind turbines. Due to their height ...

    Mathematical programming-based models for the distribution networks' decarbonization 

    García Muñoz, Fernando Esteban (Date of defense: 2022-11-22)

    (English) Climate change is pushing to decarbonize worldwide economies and forcing fossil fuel-based power systems to evolve into power systems based mainly on renewable energies sources (RES). Thus, increasing the energy ...

    Measuring energy sustainability by using energy sustainability indicators 

    Razmjoo, Ali (Armin) (Date of defense: 2021-02-19)

    The main aim of this thesis is investigating energy sustainability in developing countries using useful indicators. As it is known, serious issues such as global warming and inefficient consumption of energy will lead to ...

    Modelado y estudio del líder descendente negarivo en una descarga eléctrica atmosférica y su influencia en la localización del punto de impacto del rayo 

    Hermoso Costa, Juan Ramón (Date of defense: 2012-07-17)

    In lightning protection techniques a basic aspect is the identification of the impact point possible, which is determined by the evolution of the initial phase of the lightning, known as the stepped leader, the ground ...

    Modeling and identification of power electronic converters 

    Rojas Dueñas, Gabriel (Date of defense: 2022-01-11)

    Nowadays, many industries are moving towards more electrical systems and components. This is done with the purpose of enhancing the efficiency of their systems while being environmentally friendlier and sustainable. ...

    Modelització i control d'accionaments elèctrics. 

    Montesinos Miracle, Daniel (Date of defense: 2008-06-26)

    L'actual situació energètica demanda cada cop més d'aplicacions que redueixin el consum energètic. A nivell d'energia elèctrica, i de la conversió d'aquesta a energia mecànica, els nivells d'eficiència energètica són força ...