Now showing items 1-20 of 156
Martínez Figueroa, Gerardo de Jesús (Date of defense: 2024-02-26)
(English) The main objective of this thesis is to develop and validate simple but sufficiently accurate mathematical models for single-phase and three-phase transformers, by estimating their parameters from simple laboratory ...
Capó Lliteras, Macià (Date of defense: 2024-01-23)
(English) The proliferation of batteries for local storage and electric vehicles (EVs) is rising steadily. The EV market’s prospects point to exponential growth in the coming years. This trend has also contributed to the ...
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 ...
Barja Martínez, Sara (Date of defense: 2023-07-07)
(English) The rapid advancement of digitalization, combined with the integration of renewable generation and the development of information and communication technologies within the distribution network, is accelerating ...
Song, Jie (Date of defense: 2023-05-15)
(English) Modern power systems have been and will continue to be increasingly penetrated with power electronics at different voltage levels. Such high penetration of power electronics elements changes the nature of modern ...
Miguel Espinar, Carlos (Date of defense: 2023-05-15)
(English) EspinarThis thesis presents the overall state of the art of electric vehicles in terms of the technology of the main concepts in an electric powertrain: batteries, traction inverters, electric machines, and control ...
Li, Mingshen (Date of defense: 2023-01-23)
(English) In the grid-forming control of microgrids, the droop control is a widely used for the parallel operation of power inverters, but has some peculiarities as slow dynamic and inaccuracy in the power sharing. In the ...
Gómez Acero, Daniel Hernando (Date of defense: 2022-12-01)
(English) High voltage direct current (HVDC) technologies have been used for bulk power transmission over long distances since the 1950s. These technologies have proven to be the most cost-efficient compared to the high ...
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 ...
Urbani, Michele (Date of defense: 2022-10-28)
(English) The aim of this thesis work is the development of a VHF broadband interferometer for lightning research. The observations with this instrument allowed us to investigate some unsolved aspects of lightning related ...
Ziegler, Andreas Rainer (Date of defense: 2022-10-27)
(English) Lithium-Ion Batteries (LIBs) are being used in more and more areas of application. At the same time, their chemical composition and their designs are constantly evolving. Major developments are also taking place ...
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 ...
Coronas Herrero, Sergio (Date of defense: 2022-10-21)
(English) In recent years, the development of a generation system based on renewable energies has become the backbone of the energy policies of most countries in the world in the search for the decarbonization of the energy ...
Lledó Ponsati, Tomàs (Date of defense: 2022-07-15)
The present Ph.D. thesis has been developed following an Industrial Ph.D. program and verses on developing a commercial piece of equipment for teknoCEA, a spin-off company from CITCEA-UPC. The thesis is centered on developing ...
Abdali Nejad, Sajad (Date of defense: 2022-07-19)
The scope of this thesis is related to the enhancement of the operation of distributed generators (DGs) based on renewable energies (REs) when connected to the conventional grid network. Synchronization of those DGs, i.e. ...
Martínez Reyes, Jimmy Arturo (Date of defense: 2022-07-08)
In recent years, industries have chosen to invest in technology with the aim of making their processes more efficient and thus offering market products of higher quality. Nowadays it is very common for companies to use ...
Westerman Spier, Daniel (Date of defense: 2022-06-30)
Modular Multilevel Converters (MMCs) are a type of Voltage Source Converter (VSC) which have become the preferred topology choice for High Voltage Direct Current (HVDC) applications. Compare to its HVDC converter predecessors, ...
Saura Perisé, Jaime (Date of defense: 2022-06-22)
This doctoral thesis has been developed to provide a new point of view and a new approach to the analysis and study of uncontrolled bridge rectifiers. The methodology developed has been generalized to extend the study to ...
Lai, Ngoc Bao (Date of defense: 2022-03-23)
Power system is undergoing an unpreceded paradigm shift: from centralized to distributed generation. As the renewable-based generations and battery storage systems are increasingly displacing conventional generations, it ...
Tarrasó Martínez, Andrés (Date of defense: 2022-02-22)
During the last century, the electrical energy infrastructures have been governed by synchronous generators, producing electrical energy to the vast majority of the population worldwide. However, power systems are no longer ...