Blar i NTNU Open på forfatter "Nysveen, Arne"
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Fourier-based effective permeability for transformer iron losses computation under saturation
Wang, Wei; Nysveen, Arne; Magnusson, Niklas; Nilssen, Robert (Journal article; Peer reviewed, 2020)Computation of iron losses in transformers requires significant numerical efforts, particularly under magnetic saturation when the magnetic non-linearity needs to be considered. This study proposes a Fourier method to ... -
Framework for Analytical-based Digital Twin Development of Electric Drives Using Slotless PM Machines
Leandro, Matteo (Doctoral theses at NTNU;2023:335, Doctoral thesis, 2023)This Ph.D. thesis investigates and develops analytical models and techniques to build the foundation for the digital twin development of electric drives using slotless permanent magnet (PM) machines. The idea is to rely ... -
Frequency Converter Solutions and Control Methods for Varible Speed Operation of Pumped Storage Plants
Tiwari, Raghbendra (Doctoral theses at NTNU;2023:399, Doctoral thesis, 2023)Pumped storage hydropower plants (PSHP) are widely used for bulk energy storage around the world. The variable speed operation of these plants further enables their capability to regulate the power in pump mode as well. ... -
Future Operational Regimes of Bulk Power Generation in The Era of Global Energy Transition: Grid Codes, Challenges and Open Issues
Nøland, Jonas Kristiansen; Leandro, Matteo; Nysveen, Arne; Øyvang, Thomas (Chapter, 2020)This paper explores the effects of the ongoing energy transition on the classical bulk power generation. The rapid increase in renewable penetration changes the role of grid-connected generators significantly. Large machines ... -
HydroStator : hovedfunn og resultater i KPN-prosjektet HydroStator
Berg, Gunnar; Eberg, Espen; Aakre, Torstein Grav; Ildstad, Erling; Kantar, Emre; Nysveen, Arne (SINTEF Rapport;, Research report, 2022)Modeller som beskriver temperatur- og frekvensavhengighet til elektriske delutladninger er utviklet og viser at tilstandskontroll med den mer praktiske VLF-metoden som benytter 0,1 Hz høyspenning er representativ for 50 ... -
Image processing and machine learning application for fault diagnosis in synchronous motors
Johansen, Markus Fredrik (Master thesis, 2022)Synkronmotor feildiagnose gir innsikt i motorhelse og driftssikkerhet. Diagnostisk analyse utføres vanligvis ved å undersøke endringer i frekvenskomponenter. Denne oppgaven presenterer en bildebehandlings- og maskinlærings ... -
Influence of Converter Topology and Carrier Frequency on Airgap Field Harmonics, Magnetic Forces, and Vibrations in Converter-Fed Hydropower Generator
Valavi, Mostafa; Devillers, Emile; Le Besnerais, Jean; Nysveen, Arne; Nilsen, Roy (Journal article; Peer reviewed, 2018)This paper investigates the effects of converter-fed operation on magnetic forces and vibration in a hydrogenerator. The variable-speed hydrogenerator (in a pumped-storage power plant) is a large synchronous machine with ... -
Influence of fast rise voltage and pressure on partial discharges in liquid embedded power electronics
Abdelmalik, Abdelghaffar Amoka; Nysveen, Arne; Lundgaard, Lars Esben (Peer reviewed; Journal article, 2015)Initiation of partial discharges at the highly stressed regions of an Insulated Gate Bipolar Transistor (IGBT) can lead to degradation of the insulation and eventual total breakdown of the system. In this work, an experimental ... -
The influence of multidirectional leakage flux on transformer core losses
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2021)In a power transformer, the leakage flux enters the laminations of the iron core in different directions. Depending on the orientation of the leakage flux, it can add eddy current and hysteresis losses to the well-documented ... -
Influence of winding layout and airgap length on radial forces in large synchronous hydrogenerators
Engevik, Erlend L.; Valavi, Mostafa; Nysveen, Arne (Chapter, 2017)This paper investigates the flux density and radial force spatial harmonics in large salient pole synchronous hydro-generators. Vibration due to magnetic forces are mainly caused by low order harmonics in the airgap flux ... -
Investigation of Interior Permanent Magnet Machines with Concentrated Windings for High Dynamics Applications
Svihus, Christian (Master thesis, 2015)Interior permanent magnet (IPM) machines and non-overlapping concentrated windings (CW) are two design philosophies that have grown in popularity over the last decade. This is due to the many benefits and flexibility they ... -
Investigation of magnetic field and radial force harmonics in a hydrogenerator connected to a three-level NPC converter
Valavi, Mostafa; Nysveen, Arne; Nilsen, Roy (Chapter, 2017)This paper investigates spatial and time harmonics of flux density and radial force distributions in the airgap of a hydrogenerator with fractional-slot windings. Hydrogenerator is connected to a neutral-point-clamped (NPC) ... -
Kapasitivt indusert ladning i høyspentmast fra nærliggende kraftledning
Lytskjold, Jon (Master thesis, 2017)Oppgaven beregner kapasitivt indusert ladning i en høyspentmast i stål, plassert i nærheten av en spenningssatt 420 kV kraftledning. Beregningene ble gjort for varierende avstand til kraftledning og for varierende ... -
Losses and Inductive Parameters in Subsea Power Cables
Stølan, Ronny (Master thesis, 2009)Four samples of galvanized steel armour for sub sea power cables are tested with an electric steel tester. The samples exhibit different remanence magnetization and permeability. The effects of permeability on loss in sub ... -
Magnetic Measurements of the Higher-Order Corrector Magnets for the High-Luminosity Upgrade of the Large Hadron Collider at CERN
Dalane, Eivind (Master thesis, 2022)Denne rapporten beskriver utviklingen av to systemer for magnetiske målinger av en samling korreksjonsmagneter som skal benyttes i High-Luminosity-oppgraderingen av the Large Hadron Collider ved Den Europeiske Organisasjonen ... -
MEDIUM VOLTAGE LOAD BREAK SWITCH WITH AIR AS INTERRUPTING MEDIUM
Teigset, Anders Dall'Osso (Master thesis, 2014)Compact load break switches (LBSs) are common inside compact substations, and other places in the medium voltage distribution system where space is a limiting factor. SF6 is usually applied as interruption and insulation ... -
Modelling and Transient Analysis of a 10 MW Superconducting Wind Turbine Generator
Hossain, Md. Rafed (Master thesis, 2014)Abstract The number of installed wind turbines is growing every year as the need for energy increases in an exponential manner. As the wind turbines are trying to fulfil these requirements, the demand for output power from ... -
Modelling, Simulation, and On-line Detection of Rotor Eccentricity in Hydropower Generators
Møller, Andreas Blix (Master thesis, 2018)The generator is a critical component in the hydropower power plant, and detection of its fault conditions is important for safe and cost-effective operation. A new proposed method for detection of rotor interturn short ... -
Modelling, Simulation, and On-line Detection of Rotor Fault in Hydrogenerators
Jørstad, Kari Gjerde (Master thesis, 2017)Hydropower generator is a critical component in hydropower stations and is therefore subject to a preventive maintenance strategy to avoid failures of the generator's components. Fault detection techniques can be used to ... -
Multiphysics 3D Modelling of Ironless Permanent Magnet Generators
Zhang, Zhaoqiang; Muyeen, S.M.; Al-Durra, Abel A.; Nilssen, Robert; Nysveen, Arne (Journal article; Peer reviewed, 2014)Abstract Analytical method is widely used for the preliminary design and optimization of electrical machines. It has short calculation time and low computational cost (cost of simulation codes and supporting hardware), but ...