Browsing Institutt for elkraftteknikk by Document Types "Doctoral thesis"
Now showing items 1-20 of 130
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Ablation-assisted load current interruption in medium votage switchgear
(Doctoral theses at NTNU;2019:5, Doctoral thesis, 2019)The switching of loads and feeders in medium voltage (1-52 kV) networks is essential to the operation of distribution networks. Thus, medium voltage load-break switches are abundant in networks today and could become even ... -
AC machine control: Robust and sensorless control by parameter independency
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:124, Doctoral thesis, 2009)In this thesis it is first presented how robust control can be used to give AC motor drive systems competitive dynamic performance under parameter variations. These variations are common to all AC machines, and are a result ... -
Activation Optimization and Congestion Management in the European Balancing Energy Market
(Doctoral theses at NTNU;2019:313, Doctoral thesis, 2019)At the heart of the electricity system, a System Operator (referred to as Transmission System Operator (TSO) in Europe) faces the crucial task of coordinating the continuous balance between generation and consumption. Using ... -
Advanced Control Design for Grid-Connected Converters in Renewable Energy Applications
(Doctoral theses at NTNU;2024:281, Doctoral thesis, 2024)In the pursuit of more efficient and responsive VSC-based grid-connected renewable energy systems, this Thesis embarks on a comprehensive exploration of advanced control methodologies. It presents a structured journey ... -
Advanced Control of Power Converters: Modular Multilevel Converter
(Doctoral theses at NTNU;2014:343, Doctoral thesis, 2014)Multilevel converters can reach medium-voltage operation increasing the efficiency of high-power applications. Among the available multilevel converter topologies, the invention of Modular Multilevel Converter (MMC) has ... -
AIR LOAD BREAK SWITCH DESIGN PARAMETERS
(Doctoral thesis at NTNU;2015:252, Doctoral thesis, 2015)Current interruption is vital in the power system, as this makes it possible to control the use of different loads, change the grid configuration, and minimize damage when faults occur. This thesis presents a study of ... -
Analysis and Control of a Modular Series ConnectedConverter for a Transformerless Offshore Wind Turbine
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:279, Doctoral thesis, 2013)A modular series connected converter consisting of N number of converter units, suitable for a high power, high voltage transformerless offshore wind turbine is analyzed in this thesis. The main objective is to verify the ... -
Analysis and modelling of the dynamics of aggregate energy demand
(Dr. ingeniøravhandling, 0809-103X; 2003:88, Doctoral thesis, 2003)The thesis consists of four papers that can be read separately. The papers involve analyses and modelling of residential energy demand. Through my work I have derived a nonlinear time-series econometric model and a ... -
Analysis of Integrated Balancing Markets in Northern Europe under Different Market Design Options
(Doctoral thesis at NTNU;2015:311, Doctoral thesis, 2015)In an electric power system, the instantaneous balance between demand and supply must always be maintained. Due to the inherent stochasticity of certain types of generation sources and demand, as well as contingencies ... -
Application of Phasor Measurements for Online Monitoring and Adaptive Damping Control of Electromechanical Oscillations
(Doctoral theses at NTNU;2022:230, Doctoral thesis, 2022)Power systems are large and complex systems consisting of thousands of components, like generators, transformers and transmission lines, which function together to ensure that the voltage and frequency are close to the ... -
Automated short-term production planning process for hydro and windpower
(Doctoral theses at NTNU;2021:361, Doctoral thesis, 2021) -
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 ... -
Characteristics of Switching Arc in Ultrahigh-pressure Nitrogen
(Doctoral thesis, 2020)An increasing number of wind farms and mining operations located far off the coast will lead to the development of offshore substations. To avoid the large costs associated with platforms and floaters, such a substation ... -
Characterization and Analysis of Photovoltaic Modules and the Solar Resource Based on In-Situ Measurements in Southern Norway
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:350, Doctoral thesis, 2012)In broad terms, this thesis is concerned with outdoor testing of individual photovoltaic (PV) modules and characterization of the solar resource in Southern Norway. The work aims to evaluate the irradiance and temperature ... -
Communication Network for Internal Monitoring and Control in Multilevel Power Electronics Converter
(Doctoral thesis at NTNU;2014:354, Doctoral thesis, 2014)The design process of complex power electronics converters, such as the multilevel converter, can be simplified with the concept of Power Electronic Building Blocks (PEBBs). PEBB is a fully integrated hardware with ... -
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 ... -
Control of Grid Integrated Voltage Source Converters under Unbalanced Conditions: Development of an On-line Frequency-adaptive Virtual Flux-based Approach
(Doctoral Theses at NTNU, 1503-8181; 2012:90, Doctoral thesis, 2012)Three-Phase Voltage Source Converters (VSCs) are finding widespread applications in grid integrated power conversion systems. The control systems of such VSCs are in an increasing number of these applications required to ... -
Control, Dynamics and Operation of Multi-terminal VSC-HVDC Transmission Systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:354, Doctoral thesis, 2012)In recent years, there has been an increased development and deployment of renewable energy resources to meet the ever increasing electric power demand and to limit the use of fossil fuels. This has spurred offshore wind ... -
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 ... -
Design and Modelling of Linear Permanent Magnet Actuator with Gas Springs for Offshore Applications
(Doctoral thesis at NTNU;2016:130, Doctoral thesis, 2016)Although rotary steerable systems have been evolving rapidly and delivering unprecedented rates of drilling penetration, drillers nevertheless seek technologies that further accelerate the drilling process. Currently, ...