Browsing Institutt for elkraftteknikk by Title
Now showing items 713-732 of 2571
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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, ... -
Earth fault protection in isolated and compensated power distribution systems
(Master thesis, 2016)This report is the result of the work with the master thesis written during the spring of 2016 at NTNU, where the main ambition has been to find a relay setting for earth fault protection that can work both in isolated and ... -
Economic analysis of large-scale pumped storage plants in Norway
(Peer reviewed; Journal article, 2016)The European power system needs to develop mechanisms to compensate for the reduced predictability and high variability that occur when integrating renewable energy. Construction of pumped storage plant (PSP) is a solution. ... -
Economic and environmental benefits from integrated power grid infrastructure designs in the North Sea
(Journal article; Peer reviewed, 2018)The North Sea Offshore Grid (NSOG) is considered an important contributor towards large-scale integration of renewables and electricity market coupling. Different typologies have been studied for such a multinational power ... -
Economic Benefit of New Capacity in the Central Grid
(Master thesis, 2009)Norway and the EU have in recent years established ambitious goals to increase the share of renewable energy in their consumption. On account of these goals, a large-scale wind power development can be expected in northern ... -
Economical Optimisation of Wind Powered Pump Hydro Storage Systems in Norway
(Master thesis, 2022)Den økte globale gjennomsnittstemperaturen har sørget for en energiomstilling hvor vind- og solkraft vil være de størst voksende energikildene i årene som kommer. Denne type energkilder er variable og usikre ettersom de ... -
Economical Secondary Control of DC Microgrids
(Chapter, 2020)This paper proposes a distributed secondary voltage and current control aiming at economic dispatch of DC micro-grids. The dispatch problem is solved with the Lagrange method resulting in the equal incremental costs ... -
Ecosystem well-being and platform survival in the current energy transition: A case study on the evolution of an EV-charging platform
(Peer reviewed; Journal article, 2023)This paper aims to identify the capabilities required for elec- trical energy service platforms to survive and sustain in the ongoing energy transition. The paper contributes to two fields: Information sys- tems in the ... -
Eddy Current Loss in Grain-Oriented Steel Laminations due to Normal Leakage Flux
(Peer reviewed; Journal article, 2021)Leakage flux penetrating laminated iron cores in power transformers and large generators induces eddy current and local loss. Due to the strong magnetic anisotropy of the lamination structure, the penetrating flux tends ... -
Eddy current losses in transformer windings
(Master thesis, 2020)Målet med denne masteroppgaven er å undersøke en semi-analytisk tapberegningsmetode, spesielt når man tar hensyn til virvelstrømstap i transformatorviklinger. Dette gjøres gjennom sammenligninger mellom simulerte og målte ... -
Effect of a Non-Ideal Power Take-Off System on the Electrical Power Output of a Wave Energy Converter under Passive Control
(Master thesis, 2020)Fysiske havbølger er ikke-stasjonære av natur, noe som gir en utfordring når en bølgeomformer skal konstrueres og kontrolleres. Gjennom tidene er det foreslått mange forskjellige kontrollstrategier for å kunne øke mengden ... -
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 ... -
Effect of Barriers in Air Insulated Rod-Plane Gaps
(Master thesis, 2012)The purpose of the experiments conducted in this Master's thesis is to predict and explain the change in breakdown voltage when insulating barriers are introduced in a rod-plane gap arrangement. The experiments have been ... -
Effect of Elastic Modulus on the Tangential AC Breakdown Strength of Polymer Interfaces
(Journal article; Peer reviewed, 2018)Solid-solid interfaces between insulating materials dictate the long-term electrical properties of the complete insulation system. This paper presents theoretical and experimental investigations aiming to address the impact ... -
Effect of Filling Pressure on Post-Arc Gap Recovery of N2
(Peer reviewed; Journal article, 2020)Experimental investigation of the effect of filling pressure on the post-arc dielectric recovery characteristics of nitrogen is reported in this paper. A half-cycle arc current duration of 540 μs followed by a 10 kV pulse ... -
Effect of filling pressure on Thermal Reignition Performance of free burning ultra-high Pressure Nitrogen arc
(Master thesis, 2018)The aim of this thesis is to study the thermal reignition characteristics of the free burning arc in SC nitrogen medium. Rate of change of current before interruption and rate of rise of recovery voltage (RRRV) after ... -
Effect of Including Transient Virtual Impedance in Droop-Controlled Microgrids
(Chapter, 2018)Droop control has shown promising results for decentralized power sharing in microgrids. However, the basic scheme can suffer from unequal reactive power sharing power due to differing line impedances between converters ... -
Effect of Material Elasticity on the Longitudinal AC Breakdown Strength of Solid-Solid Interfaces
(Journal article; Peer reviewed, 2019)Solid-solid interfaces between insulating materials dictate the long-term electrical properties of the complete insulation system. This paper presents theoretical and experimental investigations aiming to address the impact ... -
The effect of mixed orientation on the accuracy of a forecast model for building integrated photovoltaic systems
(Peer reviewed; Journal article, 2023)BIPVs (Building Integrated Photovoltaics) are expected to dominate the solar industry in urban areas, especially in connection with zero-emission buildings. They allow the use of mixed orientations which result in multiple ... -
The Effect of Non-Ideal Operating Conditions on Reliability of Inverters in Microgrids
(Peer reviewed; Journal article, 2020)Microgrids are becoming increasingly popular due to modern trends in power consumption and distribution. Power converters are essential in order to ensure the desired function of a microgrid. As with traditional distribution ...