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Sai Nair, Vishnu (author)This thesis investigates and compares the performance of HVDC protection algorithms in terms of their sensitivity, selectivity, speed, and robustness. The threshold determination process for each algorithm has been described in detail as well. Each algorithm is tested under various fault resistances, and fault distances to test the sensitivity...master thesis 2023
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Klop, Casper (author)Offshore wind energy is expected to play a major role in the upcoming energy transition. For long distances to shore, it is preferable to connect the wind farms to land by means of High-Voltage DC (HVDC) cables to reduce losses and costs. This currently poses challenges, as wind turbine generators produce variable-frequency low-voltage AC power,...master thesis 2022
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Marchand, Jane (author)Given the urgency to shift to a cleaner energy mix, offshore wind energy is bound to be quickly deployed on a large scale in the next years. In order to meet the Paris Agreement, the current role-out rate of wind energy in the North Sea, that is 2 GW/year, needs to be increased to an average value of 7 GW/year over the period 2023-2040. This...master thesis 2021
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Ghassemi, Amir (author)Destructive consequences of trapped space charges within HVDC coaxial cable insulation, such as accelerated aging, degradation, and breakdown, are some of the most significant challenges that manufacturers and users usually come up with. Pulsed Electro-Acoustic (PEA) method is a widely-used method for space charge detection and measurement, in...master thesis 2020
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Kidambi Murali, Pragati (author)Renewable energy resources are the most successful, promising, and economical mode of energy generation. Moreover, wind energy is also one of the victorious candidates in generating renewable energy. Currently, High Voltage Direct Current (HVDC) systems are designed to integrate the energy harvested in the Offshore Wind Farms (OWF) to the grid...master thesis 2020
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Shukla, S. (author)The power system in Northern Europe supports a high degree of penetration of Wind Energy-based HVDC connections. Most of the modern HVDC connections will have Bipole with a dedicated metallic return (DMR) configuration. This thesis presents a basic guideline to increase the Levelized cost of operation of Bipole HVDC links by attaching the...master thesis 2020
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GURUMOORTHI, Hari Prasath (author)Increase in demand for electric power and renewable sources of energy drives the need for more transmission & distribution capacity. When using DC, as RMS and peak voltage are the same, transferring more power can be economical but at the same time erecting new transmission lines is often associated with demanding approval procedures,...master thesis 2019
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Papadakis, Haris (author)Nowadays there is a movement towards the creation of HVDC grids. The massive integration of renewable energy sources, the operation of the current grid close to its limits and the need to facilitate the power trade are some of the reasons driving the research on HVDC grids. Towards HVDC grids, there are still some obstacles and technical...master thesis 2017
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Inanc Sari, H. (author)The increase in the energy demand has resulted in searching for new energy sources. Due to the increased prices of fossil fuels and the environmental issues, renewable energy sources has become popular in Europe. Renewable energy generation such as wind, solar and wave has point-to-point connections with the main grid. In order to minimize the...master thesis 2016
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Agbemuko, A.J. (author)An ever increasing interest in renewable energy sources (RES) in order to reduce global carbon emissions and alleviate problems posed by climate changes has lead to dramatic increase particularly in offshore wind energy projects. Several different projects are currently being executed and so many are being planned for the future. The location of...master thesis 2016
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- Wei, J. (author) master thesis 2016
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Aji, H. (author)High Voltage Direct Current (HVDC) transmission system technology has recently attracted a lot of attention within the power system community. Modular Multilevel Converter (MMC) HVDC is the state of the art HVDC transmission technology, which contains hundreds and even thousands of submodules. It is the modularity, scalability and efficiency...master thesis 2016
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Kavungal Kolparambath, S. (author)The development of far-offshore wind farms and other large-scale renewable energy sources, together with the increasing needs for long distance power transmission is resulting in more HVDC systems being integrated into the traditional AC power network. Due to the capability for operation in isolated AC grids, VSCs are becoming the preferred...master thesis 2015
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Blufpand, S.Y. (author)The thesis consists of 7 chapters. The first chapter will explain the background, motivations and the general overview of the thesis. Chapter 2 is a literature review describing the physics behind the creation of PDs. The conditions necessary for the occurrence of PDs are covered in addition to an analysis of the different types of PD in GIS...master thesis 2014
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Piccin, R. (author)Nowadays, Gas Insulated Substations (GIS) are vital nodes of the Transmission Network due to their compact dimensions permitted by the use of SF6 as insulating medium and the high reliability guaranteed. Nonetheless, the strictly requirements of safety in operation and continuous power supply catalyse the attention to improve the reliability and...master thesis 2013
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Van der Born, D. (author)Polymeric insulation materials have not been used in HVDC cable systems until recently. The main cause of this being the tendency of polymers to deplete accumulated charge very slowly. Research into the dynamics of space charge trapping, injection and conduction in polymers can reveal important information from which new materials can be...master thesis 2011
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De Haas, M.M.P. (author)In this study the term smart grid is specified toward online diagnostics. It is investigated which online diagnostics techniques fit well within smart grids and whether existing technologies can be used in a smarter way. Smart grids and online diagnostics Since 2005, the term smart grids is widely used in literature. To assess what smart grid...master thesis 2011
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- Sookha, V.G. (author) master thesis 2011
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Shire, T.W. (author)The recent development in semiconductor and control equipment has made HVDC transmission based on voltage-source converter (VSC-HVDC) feasible. VSC-HVDC has numerous advantages such as a controllable short-circuit current contribution, the rapid and independent control of active and reactive power, and good power quality. With these advantages...master thesis 2009