Blar i Institutt for elkraftteknikk på emneord "VDP::Technology: 500::Electrotechnical disciplines: 540::Electrical power engineering: 542"
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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 ... -
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 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 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 ... -
Automated short-term production planning process for hydro and windpower
(Doctoral theses at NTNU;2021:361, Doctoral thesis, 2021) -
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 ... -
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 ... -
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, ... -
Design and optimisation of an auxiliary power supply with medium-voltage isolation using GaN HEMTs
(Doctoral theses at NTNU;2020:350, Doctoral thesis, 2020)This PhD thesis shows that compact and efficient converter systems can be obtained by leveraging the inherent characteristics of GaN HEMT devices. In the targeted application of an auxiliary power supply with medium-voltage ... -
Dielectric barriers under lightning impulse stress: Breakdown and discharge-dielectric interaction in short non-uniform air gaps
(Doctoral theses at NTNU;2019:106, Doctoral thesis, 2019)Dielectric-air insulation systems can reduce the carbon footprint of medium voltage switchgear, as they can replace SF6-insulated systems. Such replacement is, however, not easy, as the devices are typically compact and ... -
Dynamic Electricity Market Games – Modeling Competition under Large-scale Storage
(Doctoral theses at NTNU;2019:177, Doctoral thesis, 2019)Electricity shows similar characteristics to traditional commodity goods which led to the market mechanisms to trade electricity being developed in similar manner to markets for other commodities. Kirchho's laws, however, ... -
Effect of Absorbed Water and Temperature on Charge Transport and Accumulation in XLPE Cable Insulation
(Doctoral theses at NTNU;2021:243, Doctoral thesis, 2021)As the use of HVDC subsea power cables increases, studying DC phenomena in wet conditions becomes increasingly important. Space charge accumulation and transport in the insulation is relevant for ageing and the ability to ... -
Energy Storage for Control of Distributed Photovoltaic Power Systems
(Doctoral theses at NTNU;2019:15, Doctoral thesis, 2019)The residential energy storage market is growing at a rapid pace in many countries. Increasing the consumption of locally produced energy and the use of energy storage as a backup source have been the main reasons for ... -
Evaluation, Modeling and Control of Modular Multilevel Converter for Photovoltaic Applications
(Doctoral theses at NTNU;2019:193, Doctoral thesis, 2019) -
Frequency control and stability requirement on Hydro plants: System identification for performance and stability assessment
(Doctoral theses at NTNU;2019:303, Doctoral thesis, 2019)The Nordic transmission system operators (TSOs) have proposed new draft requirements for the providers of frequency containment reserves. These requirements include extensive tests to determine the dynamics of hydro power ... -
Hydrogen Production from Wind and Hydro Power in Constrained Transmission Grids
(Doctoral theses at NTNU;2022:54, Doctoral thesis, 2022)Hydrogen (H2) production from variable renewable energy (VRE) sources can be an important technology for reducing CO2 emissions. Integrating electrolytic H2 production into the electricity system can contribute to this ... -
Improvements in protection of medium voltage resonant grounded networks with distributed sources
(Doctoral theses at NTNU;2018:386, Doctoral thesis, 2018)The increasing penetration of distributed generation into medium voltage networks creates challenges for traditional protective schemes developed for conventional radial systems with unidirectional power flows. Moreover, ... -
Integration of Electric Vehicles into Power Distribution Systems – The Norwegian Case Study; Using High-Performance Multi-Period AC Optimal Power Flow Solver
(Doctoral theses at NTNU;2020:332, Doctoral thesis, 2020)With the massive increase in the integration of Electric Vehicles (EVs), their share of energy consumption has shifted from fossil fuels to electricity. This shift in turn heavily relies on the safe, reliable and cost-efficient ... -
INVESTIGATION OF THE MATRIX CONVERTER IN A DC SERIES-CONNECTED WIND FARM: Modulation, Control and Efficiency
(Doctoral thesis at NTNU;2016:16, Doctoral thesis, 2016)In this thesis a wind energy conversion system for series-connection of DC wind turbines is considered. The wind park topology offers the advantage of a high voltage transmission without the need of an offshore platform ...