Blar i Institutt for elkraftteknikk på emneord "VDP::Teknologi: 500::Elektrotekniske fag: 540::Elkraft: 542"
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Balancing of wind and solar power production in Northern Europe with Norwegian hydropower
(Doctoral theses at NTNU;2018:201, Doctoral thesis, 2018)The European Union (EU) aims to reduce the green-house-gas emissions from the power system to nearly zero in 2050. The future power system in Europe will include high share of variable wind and solar resources. Norway has ... -
Control and Stability of Isolated Grids with Synchronous and Non-Synchronous Generation
(Doctoral theses at NTNU;2023:450, Doctoral thesis, 2023)This thesis explores the challenges and opportunities associated with integrating offshore wind turbines into a geographically compact power-intensive isolated electric grid that is currently supplied by gas-powered ... -
Data-driven sizing and control of energy storage for wind-powered offshore platforms – Energy Management and Control of Offshore Platforms Integrating Renewable Energy
(Doctoral theses at NTNU;2023:86, Doctoral thesis, 2023)One of the key aspects of facing the global environmental crisis and achieving sustainable development for future societies is re-thinking the way energy is produced and managed to serve the demand. This perspective calls ... -
Earth Fault Location in Non-Radial Resonant Grounded Networks – Theory, analysis and methods
(Doctoral theses at NTNU;2024:59, Doctoral thesis, 2024)A common grounding scheme for medium voltage distribution networks and high voltage sub-transmission networks is the resonance grounding scheme. Resonant grounded networks have few interruptions and a high quality of supply, ... -
Electromagnetic field calculation and power loss evaluation in power transformers - Analysis of Leakage Fields and Stray Losses under Special Operation Conditions
(Doctoral theses at NTNU;2022:395, Doctoral thesis, 2022)The PhD research work presented in this thesis deals with electromagnetic field calculation and loss evaluation in power transformers under special operation conditions. The special loading conditions under investigation ... -
Frequency Converter Solutions and Control Methods for Varible Speed Operation of Pumped Storage Plants
(Doctoral theses at NTNU;2023:399, Doctoral thesis, 2023)Pumped storage hydropower plants (PSHP) are widely used for bulk energy storage around the world. The variable speed operation of these plants further enables their capability to regulate the power in pump mode as well. ... -
Internal Partial Discharges at High DC Voltage and the Effect of Superimposed AC Voltage
(Doctoral theses at NTNU;2020:327, Doctoral thesis, 2020)The power electronic equipment needed in HVDC grids produces an AC ripple voltage with amplitude of around one-hundredth of the main DC voltage. The high voltage can result in partial discharges (PDs), which are a sign of ... -
A Novel Health Monitoring System for Synchronous Generators using Magnetic Signatures
(Doctoral theses at NTNU;2022:297, Doctoral thesis, 2022)The Ph.D. research work presented in this thesis deals with the health monitoring of synchronous generators utilized in hydropower plants. Although various methods are available for fault detection in synchronous generators, ... -
Off-core magnetic flux paths in power transformers. Modeling and applications
(Doctoral theses at NTNU;2020:140, Doctoral thesis, 2020)Zero sequence (ZS) characteristics of transformers are of great importance in some circumstances including unbalanced and DC biased operations. Any unbalanced condition in the voltage supplying a transformer or in the load ... -
Optimal and Adaptive Arming of System Protection Schemes
(Doctoral theses at NTNU;2023:437, Doctoral thesis, 2023)A dependable power supply is critical to the well-being of today’s society. According to forecasts, this issue will become increasingly relevant and pose numerous challenges that need to be faced. The energy demand is ... -
Optimal coordination of renewable sources and storage in energy-constrained power systems
(Doctoral theses at NTNU;2022:188, Doctoral thesis, 2022)Integrating high levels of variable renewable energy sources (VRESs) in power systems imperils the security of supply. Energy storage systems (ESSs) contribute both to cost reduction through increased and improved utilization ... -
Reliability Assessment Tool for Modern Electrical Distribution Systems – A Monte Carlo Simulation Approach
(Doctoral theses at NTNU;2023:172, Doctoral thesis, 2023)The electrical power system is under constant development, and multiple changes will occur in the upcoming years, leading to a more intelligent and active system with the integration of ICT, distributed generation, and ... -
Scalable Regenerative Power Converters for Accelerator Magnets
(Doctoral theses at NTNU;2023:413, Doctoral thesis, 2023)Electromagnets are used at The European Centre for Nuclear Research (CERN) in high-energy physics experiments to direct the charged particle beams. They store significant amounts of energy in the magnetic fields and are ... -
SiC MOSFETs an Diodes: Characterization, Applications and Low-Inductive Converter Design Considerations
(Doctoral theses at NTNU;2019:238, Doctoral thesis, 2019)The future power electronic system trends are: higher efficiency, higher power density, higher operating temperature and lower operation cost of power electronic converters. The emerging wide-bandgap (WBG) semiconductor ... -
Stability and Power Quality Improvements to Facilitate Wide-Scale Deployment of Future Microgrids
(Doctoral theses at NTNU;2021:388, Doctoral thesis, 2023)The massive integration of distributed energy resources (DERs) represents a paradigm shift for the traditional power system, which until recently has been dominated by large, centralized power generation units. In addition ... -
Stability Improvement of MMC-Based Multiterminal HVDC Grids
(Doctoral theses at NTNU;2024:7, Doctoral thesis, 2024)The 100% renewable European smart grid cannot be implemented without reliance on wind energy from the offshore wind farms in the North Sea. High-voltage direct current (HVDC) cables are generally used to transfer power ...