Now showing items 132-151 of 154

    Offshore grid control of voltage source converters for integrating offshore wind power plants 

    Raza, Muhammad (Date of defense: 2017-12-13)

    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 ...

    Operation and control of transmission systems for offshore wind power plants 

    Aragüés Peñalba, Mònica (Date of defense: 2016-04-29)

    This thesis deals with grid integration of oshore wind power plants through HVDC (High Voltage Direct Current) or HVAC (High Voltage Alternating Current) transmission . The behaviour of wind farms and their transmission ...

    Operation of HVDC converters for transformer inrush current reduction 

    Solh Joukhah, Zahra (Date of defense: 2017-10-27)

    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 ...

    Optimal operation and design of modular multilevel converter for HVDC applications 

    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, ...

    Photovoltaic power converter for large scale applications 

    Verdugo Retamal, Cristian Andrés (Date of defense: 2021-07-23)

    Most of large scale photovoltaic systems are based on centralized configurations with voltage source converters of two or three output voltage levels connected to photovoltaic panels. With the development of multilevel ...

    Planning the integration of the renewable energy sources on islands, under the National Electric System in Mexico 

    Mendoza Vizcaino, Fco. Javier (Date of defense: 2019-01-29)

    The electric generation systems on islands are based generally on fossil fuel. This fact and its supply make the electricity cost higher than in systems used in the continent. In this thesis, as a first part, a review of ...

    Possibilities and limitations of active battery management systems for lithium-ion batteries 

    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 ...

    Power calculation algorithm under nonlinear loads and Hopf oscillator-based synchronization controller for grid-forming inverters in a microgrid 

    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 ...

    Power conditioner based fuel cell and backup power system with supercapacitor 

    Trujillo Caballero, Juan Carlos (Date of defense: 2012-03-03)

    PEMFCs are the most popular type of Fuel Cells (FCs) and traditionally use hydrogen as the fuel. One FC problem is its relative slow dynamics caused by the time constant of the hydrogen and oxygen supply systems that can ...

    Power converter control for offshore wind energy generation and transmission 

    Prieto Araujo, Eduardo (Date of defense: 2016-05-27)

    This thesis discusses the control of different power converters that will have a key role in future offshore wind power systems, enabling the integration of the power generated by the wind turbines into the mainland ...

    Power converter optimal control for wind energy conversion systems 

    Trilla Romero, Lluís (Date of defense: 2013-11-15)

    L'energia eòlica ha incrementat la seva presència a molts països i s'espera que tingui encara un pes més gran en la generació elèctrica amb la implantació de la tecnologia eòlica marina. En aquest context el desenvolupament ...

    Probabilistic analysis to assess the impact of the charge of electric vehicles on distribution grids under normal operation 

    Valsera Naranjo, Eduardo (Date of defense: 2014-05-07)

    The incorporation of high levels of small-scale non-dispatchable distributed generation is leading to the transition from the traditional 'vertical' power system structure to a 'horizontally-operated' power system, where ...

    Protection and fault management in active distribution systems 

    Monadi, Mehdi (Date of defense: 2016-12-14)

    The integration of renewable energy resources (RES), as a type of distributed generation (OG) units, is increasing in distribution, systems. This integration, changes the topology, performance and the operational aspects ...

    Reducció del mode comú en convertidors Back-2-Back 

    Fillet Castella, Sergi (Date of defense: 2014-09-19)

    This work deals with the study of Back-2-Back converters, with special emphasis on its effects on the common mode. For the study performed, a review of the different known causes for bearing currents and the contribution ...

    Regulación de la actividad de la distribución de energía eléctrica 

    Ramírez Pisco, Rodrigo (Date of defense: 2010-07-07)

    La regulación de la actividad de la distribución, aspecto sobre el cual versa esta tesis, ha presentado un horizonte cambiante en los últimos años. Tales cambios se hallan relacionados con aspectos como:<br/>Retribución ...

    Remaining useful life and fault detection models for high voltage electrical connectors focused on predictive maintenance 

    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 ...

    Sag effects on protection system in distributed generation grids 

    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 ...

    Simulación interactiva de motores de reluctancia autoconmutados 

    Blanqué Molina, Balduino (Date of defense: 2007-12-19)

    En esta tesis se hacen contribuciones a la simulación interactiva de motores de reluctancia autoconmutados desde la perspectiva de la ingeniería concurrente.<br/>En primer lugar, después de una breve introducción histórica, ...

    Sistema d'anàlisi i planificació de xarxes de distribució d'energia elèctrica de mitjana tensió 

    Gratacòs Prats, Jaume (Date of defense: 2016-01-18)

    The optimal planning of the annual development tasks of a medium voltage power distribution network, to tackle the evolution of the demand with maximum levels of quality and continuity of service and minimum investment, ...

    Sostenibilidad técnica, económica y ambiental de flotas comerciales de vehículos eléctricos 

    Cestau Cubero, Silvia (Date of defense: 2015-02-09)

    This doctoral thesis analyses whether electric vehicle is technical, economic and environmental sustainable. We have studied a company fleet of electric vehicles which has a carsharing service for the retail department to ...