Programa de Doctorat en Enginyeria Elèctrica: Recent submissions
Now showing items 21-40 of 154
Dc-dc converters for HVDC heterogeneous interconnections
(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 ...
Mathematical programming-based models for the distribution networks' decarbonization
(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 ...
Development of a VHF broadband interferometer to investigate unsolved lightning phenomena: high-energy radiation from lightning strikes and multi-stroke positive cloud-to-ground flashes
(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 ...
Possibilities and limitations of active battery management systems for lithium-ion batteries
(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 ...
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
(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 ...
Aportació a l’anàlisi i gestió tècnica-econòmica dels sistemes de generació distribuïda amb energies renovables i microxarxes : introducció a la presa de decisions en el context normatiu actual
(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 ...
Modular platform for research in microgrids
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 ...
Enhance OF SOGI-FLL and SOGI-PLL response to voltage sags and swells perturbations
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. ...
Remaining useful life and fault detection models for high voltage electrical connectors focused on predictive maintenance
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 ...
Optimal operation and design of modular multilevel converter for HVDC applications
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, ...
Contribucions a l'estudi de rectificadors no controlats m-fàsics en condicions no equilibrades per unitats TRUs o ATRUs multi polsos
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 ...
Corona discharges from grounded rods and 337/777 nm emissions of laboratory long sparks
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 ...
Sag effects on protection system in distributed generation grids
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 ...
Data-driven methodologies for evaluation and recommendation of energy efficiency measures in buildings. Applications in a big data environment
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 ...
Modeling and identification of power electronic converters
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. ...
Design optimization and performance analysis methodology for PMSMs to improve efficiency in hydraulic applications
In the recent years, water pumping and other hydraulic applications are increasingly demanding motors capable to operate under different working conditions, including variable pressure and volumetric flow demands. Moreover, ...
Caracterización de la electrificación de tormentas para su aplicación en procesos de sistemas de alerta: el caso de aerogeneradores y otras infraestructuras elevadas
In an increasingly technological society,vulnerability to the effects of lightning is also increasing. The implementation of monitoring and surveillance systems in real time of lightning activity can greatly improve the ...
Flexibility services for distribution network operation
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 ...
Energy security in power systems within the frame of energy transitions
Climate change is real. Global human population is growing as never before. Natural resources are limited. These factors have taken different countries to embrace new pathways in order to fulfill the energy needs of their ...
Aportación al análisis de la distribución de corriente del rayo en palas de aerogenerador equipadas con fibra de carbono
This doctoral thesis investigates the current distribution in a wind turbine blade when it is struck by lightning. The thesis focuses on the problem of current distribution in blades with carbon fiber spar caps. In the ...
