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Surface charging of dielectric barriers in short rod-plane air gaps – experiments and simulations
(Chapter, 2018)Surface charge on dielectric surfaces can alter the field conditions of insulation systems substantially. In this work, lightning impulse experiments are compared with a simulation model for surface charging in rod-barrier-plane ... -
Surface charging of dielectric barriers under positive lightning impulse stress
(Chapter, 2017)The complex geometry of gas-insulated substations makes it difficult to predict withstand voltages. A key challenge is the characterization of the interaction between electrical discharges and dielectric surfaces. A 60 mm ... -
Surface Flashover over a Micro-Profiled Cylinder in Air
(Peer reviewed; Journal article, 2023)Increasing the lightning impulse (LI) flashover voltage of insulators can require significant changes to the geometry and material properties of the insulator or electrodes. In some cases, such changes can be difficult to ... -
Sviktmodell for krafttransformatorer
(Master thesis, 2016)Arbeidet beskrevet i denne rapporten er utført i samarbeid med SINTEF Energi og forskningsprosjektet «Trafotiltak». Hovedmålet i SINTEF-prosjektet er å utarbeide et teknisk-økonomisk beslutningsverktøy for forvaltning av ... -
Svært anstrengte kraftsituasjoner
(Master thesis, 2007)Formålet med denne oppgaven er å vise hvordan tiltak som skal sikre det norske kraftsystemet i en tørrårssituasjon, vil påvirke den normale disponeringen av vannmagasinene. Den høye vannkraftandelen i det norske ... -
Swarm electrification: Harnessing surplus energy in off-grid solar home systems for universal electricity access
(Peer reviewed; Journal article, 2023)Achieving universal access to electricity by 2030, as set out by the Sustainable Development Goals, presents a significant challenge given the current rate of progress. A recent promising concept is swarm electrification. ... -
Switching Performance Assessment of a 1.2 kV, 300 A, 175 °C All-SiC Half-Bridge Module Using Computer Tools - Investigation of the Impact of Internal Stray Inductance on Switching Behavior
(Master thesis, 2017)In this thesis, a half-bridge module rated at 1.2 kV, 300, 175 °C A employing SiC MOSFETs and SiC Schottky diodes has been developed and evaluated using computer tools. The developed module emulated a commercial available ... -
Switching sequences for non-predictive declutching control of wave energy converters
(Peer reviewed; Journal article, 2021)Aiming at improving the energy absorption from waves, a number of studies have considered declutching control - a phase-control method that consists of disengaging the power take-off (PTO) system from the oscillating body ... -
Synchronization properties of Voltage Source Converters when seen as Coupled Oscillators based on the Kuramoto Model
(Chapter, 2018)This paper presents an alternative framework for comparing the synchronization properties of two different control techniques for Voltage Source Converters (VSC) using the Kuramoto equivalent model as a basis. The traditional ... -
Synchronous Optimal Modulation for Medium voltage Multi-phase Machines: Implementation of three-level modulators in Field Programmable Gate Arrays
(Master thesis, 2013)The advancement in power electronics devices like Insulated Gate Bipolar Transistors (IGBT) has increased the low voltage ac drive to the medium voltage drive system. These IGBTs have higher voltage capability. For eliminating ... -
Synthetic Inertia from a Converter-Fed Synchronous Machine in a Hydro-Electric Power Plant - Modeling, Control and Analysis
(Master thesis, 2018)As the share of variable renewable energy in the power system rises, the demand for balancing technologies to compensate for fluctuation in production increases. Pumped-storage hydropower has significant potential globally ... -
Synthetic Inertia from Wind Farms - Impacts on Rotor Angle Stability in Existing Synchronous Generators
(Master thesis, 2014)As the share of wind power in the power system rises, synchronous generators in traditional power plants are taken out of the grid and replaced by a large number of wind turbines. Most modern wind turbines utilize a power ... -
Synthetic Inertia from Wind Farms - Impacts on Rotor Angle Stability in Existing Synchronous Generators
(Master thesis, 2014)As the share of wind power in the power system rises, synchronous generators in traditional power plants are taken out of the grid and replaced by a large number of wind turbines. Most modern wind turbines utilize a power ... -
Synthetic Inertia Provision from Variable Speed Turbines and HVDC in the Nordic Power System
(Master thesis, 2021)Behovet for energikilder med lavt utslipp vokser, og i fremtiden er det naturlig å se for seg et kraftsystem der fornybare energikilder utgjør en større andel av kraftproduksjonen. Den økende andelen av fornybar energi i ... -
System Analysis of Large-Scale Wind Power Integration in North-Western Europe: A study on the impact of large-scale wind power expansion and on the impact of a North Sea offshore grid
(Master thesis, 2009)Problem description: The objective of this project was to create a simple model of the European power system and to investigate the effect an increasing amount of on- and offshore wind power will have on the North European ... -
System Design and Analysis of Electricity Provision for a Desalination Plant: A Study for Pozo Colorado, Paraguay
(Master thesis, 2014)Fresh water scarcity and drinking water quality is a challenge in Pozo Colorado, a district in the northern part of Paraguay. The area has groundwater resources that have not yet been exploited, but this water is saline ... -
System Design and Balancing Control of the North Sea Super Grid
(Doctoral Theses at NTNU, 1503-8181; 2013:311, Doctoral thesis, 2013)The construction of the North Sea Super Grid is the major step towards meetingthe future demand for electric power transmission in northern Europe. This gridwill likely also extend onshore towards the load centres, and ... -
System Design and Configuration of a Stand-Alone PV-Biomass Micro Grid: An Application for Wawashang, Nicaragua
(Master thesis, 2014)In this thesis, an evaluation of a stand-alone hybrid micro grid for the Wawashang Complex is presented. A solution for a new electricity supply and distribution system for the complex is proposed with a focus on optimal ... -
System impact studies for near 100% renewable energy systems dominated by inverter based variable generation
(Peer reviewed; Journal article, 2020)The demand for low carbon energy calls for close to 100% renewable power systems, with decarbonization of other energy sectors adding to the anticipated paradigm shift. Rising levels of variable inverter-based renewable ... -
System Impacts from Large Scale Wind Power
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:198, Doctoral thesis, 2013)The objective of the European Union to increase the share of renewable energy sources and Wind Power Production in particular, will be a severe challenge for the power system. Unscheduled production changes and remaining ...