Now showing items 6-25 of 156
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 ...
Arcanjo, Marcelo Augusto Sousa (Date of defense: 2022-03-04)
This thesis presents an investigation on the signatures of corona discharges from grounded rods under thunderstorms and in the laboratory, with optical detections in the 337/777 nm wavelengths for high voltage sparks. This ...
Bakkar, Mostafa (Date of defense: 2022-02-07)
Distributed Generators (DGs) are sensible to voltage sags, so the protection devices must trip fast to disconnect the faulted part of the grid. The DG disconnection will not be desirable in the near future with a large ...
Grillone, Benedetto (Date of defense: 2021-12-03)
In order to reach the goal set in the Paris agreement of limiting the rise in global average temperature well below 2 ºC compared to pre-industrial levels, massive efforts to reduce global greenhouse gas emissions are ...
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. ...
García Quintanilla, José Ignacio (Date of defense: 2022-01-17)
With the increasing development of renewable energy sources and their integration into the grid, international standards require next-generation plants to achieve the same levels of reliability and performance as the current ...