Browsing Institutt for elkraftteknikk by Title
Now showing items 2138-2157 of 2419
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Suitability assessment of high-power energy storage technologies for offshore oil and gas platforms: A life cycle cost perspective
(Peer reviewed; Journal article, 2023)This paper presents a technology suitability assessment (TSA) of high-power energy storage (ES) systems for application in isolated power systems, which is demonstrated through the case of offshore oil and gas platforms ... -
Superconducting magnetic energy storage in power systems with renewable energy sources
(Master thesis, 2010)The increasing focus on large scale integration of new renewable energy sources like wind power and wave power introduces the need for energy storage. Superconducting Magnetic Energy Storage (SMES) is a promising alternative ... -
Superconducting Multiphase Wind Power Generator
(Master thesis, 2021)En undersøkelse av AC-superledende spoler utføres med en permanentmagnetgenerator for en vindkraftturbin på 15 MW. To referansemodeller er dimensjonert: på den ene siden blir en DTU og NREL 15 MW vindturbinmodell tatt som ... -
Superledere i synkronmaskiner
(Master thesis, 2007)Hensikten med denne oppgaven er å skaffe en oversikt over utførte synkronmaskinprosjekter verden over, som har benyttet superledere i felt- eller statorviklinger. Videre er et dimensjoneringseksempel utføret, for å se på ... -
A supervised learning approach for optimal selection of bidding strategies in reservoir hydro
(Peer reviewed; Journal article, 2020)Power producers use a wide range of decision support systems to manage and plan for sales in the day-ahead electricity market. The available tools have advantages and disadvantages and the operators are often faced with ... -
Surface charging formulations for engineering applications: Validation by experiments and transient models
(Chapter, 2020)Electrostatic BEM (Boundary Element Method) formulations are presented for the calculation of dielectric surface charging, including saturation and restrike phenomena. The simulation results turn out to be in agreement ... -
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 ...