Browsing NTNU Open by Author "Nysveen, Arne"
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Active NPC Converter for Variable Speed Operation of Pumped Storage Hydropower Plant
Tiwari, Raghbendra; Nilsen, Roy; Nysveen, Arne (Chapter, 2020)This paper discusses the full size Active Neutral Point Clamped (ANPC) Converter for large scale (100 MW, 13-15 kV) synchronous machine in a pumped storage hydropower application to enable the variable speed operation. ... -
Advanced Fault Detection of Synchronous Generators using Stray Magnetic Field
Ehya, Hossein; Nysveen, Arne; Alfonso Antonino Daviu, Jose (Peer reviewed; Journal article, 2021)Many methods used for precise fault detection in salient pole synchronous generators (SPSGs) often require a priori knowledge of the healthy case, but this requirement impedes application of the methods since an accurate ... -
AlternaFuture - Final Report
Vereide, Kaspar; Mo, Birger; Forseth, Torbjørn; Lia, Leif; Nysveen, Arne; Dahlhaug, Ole Gunnar; Schäffer, Linn Emelie; Bustos, Ana Adeva; Sundt-Hansen, Line; Øvregård, Eirik; Glimen, Pål; Hesthagen, Trygve; Skår, Margrete; Nielsen, Torbjørn Kristian (HydroCen Report;18, Research report, 2020)AlternaFuture has been a multidisciplinary research project in Hydrocen to investigate the potential of extreme upgrading of existing hydropower system with a positive effect on the environmental conditions. The project ... -
Analyse av magnetfelt og tap ved enderegionen i direkte vannkjølte generatorer
Lid, Arne Moen (Master thesis, 2018)Denne masteroppgaven er en fortsettelse av prosjektoppgaven som ble utført høstsemesteret 2017. I den oppgaven ble det modellert en 2D- og 3D-modell i ANSYS Electronics basert på en av Statkraft AS sine store synkrongeneratorer. ... -
Analyse av magnetiske tap i stålarmeringer ved å benytte en kompleks permeabilitet
Sars, Håkon (Master thesis, 2022)Det er foretatt tapsanalyser for fire rektangulære- og fem runde armeringstråder av stål. Det ble først utført målinger med måleinstrumentet Brockhaus Messtechnik ved ulike magnetiske flukstettheter og frekvenser. Disse ... -
Analysis of Additional Eddy-Current Copper Losses in Large Converter-Fed Hydropower Generators
Engevik, Erlend Løklingholm; Valavi, Mostafa; Nysveen, Arne (Chapter, 2018)This paper investigates the effect of converter operation on AC copper losses in the stator and damper windings of a large hydrogenerator. Stator currents are computed using finite element simulations. The computed current ... -
Analysis of Demagnetization Faults in a Permanent Magnet Synchronous Machine utilizing the Stray Magnetic Field
Bruu Ringdal, Sebastian (Master thesis, 2023)En permanent magnet synkronmaskin (PMSM) er en høytytende enhet på grunn av sin høye effektivitet og høye effekt til vekt forhold. Maskinen er imidlertid utsatt for skader som kan oppdages av en sensor som er montert på ... -
Analysis of magnetic forces and vibration in a converter-fed synchronous hydrogenerator
Valavi, Mostafa; Nysveen, Arne; Nilsen, Roy; Le Besnerais, Jean; Devillers, Emile (Chapter, 2017)This paper investigates the influence of converter-fed operation on magnetic forces and radial vibration in a hydrogenerator. Flux density distribution is computed using time-stepping finite element (FE) analysis and used ... -
Analytical and FEM Calculation of Electrical Parameters of Carbon Steel Pipe in DEH Systems
Chen, Anyuan; Nysveen, Arne; Høyer-Hansen, Martin; Lervik, Jens Kristian (Chapter, 2018)In Direct Electrical Heating (DEH) systems, the pipeline of subsea oil productions conducts a large AC current to generate heat. To further improve the effectiveness of the DEH, higher operating frequency is preferable. ... -
Apparatus for loss measurements under multidirectional and dc-bias flux in electrical steel laminations
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2020)Conventional standardized power loss measurements for electric steels are performed at flux densities with a single sinusoidal and unidirectional excitation. However, the flux inside electrical steel laminations can deviate ... -
Application of AC Superconducting Windings in Large PM Synchronous Generators for Wind Power
Tiwari, Raghbendra (Master thesis, 2012)Superconductors are known for carrying very high current density without any loss of energy. This characteristic helps to achieve very high power capacity with compact size of machine. In application of superconductors, ... -
Application of signal processing and machine learning tools in fault detection of synchronous generators
Skreien, Tarjei Nesbø (Master thesis, 2020)Deteksjon av feil i synkrongeneratorar med utprega polar er avgjerande for å sikre påliteleg produksjon i vasskraftverka der desse maskinene er lokalisert. Ei enkelt kortslutning mellom vindingar (ITSC på engelsk) i ... -
Artificial Intelligence-based Algorithm for Incipient Fault Diagnosis of Salient Pole Synchronous Generator using Multiple Sensor Fusion
Sørheim, Ole (Master thesis, 2021)Vannkraft representerer omtrent 90\% av all energi som produseres i Norge. Med et økende behov for ren energi er bærekraften til vannkraftprodusenter et hovedanliggende. Det er viktig å oppdage begynnende feil i ... -
Assembly and Testing of Superconducting Field Winding
Paulsen, Morten Ellingsen (Master thesis, 2016)Superconducting rotor windings are considered for large offshore wind turbines to reduce weight, size and cost. The European project INNWIND.EU utilize various national projects in different European countries to accelerate ... -
Belastbarhet for roterende frekvensomformere for jernbanen i Norge
Klingan, Ole Johan Ekeli (Master thesis, 2014)I denne oppgaven har det blitt beregnet temperaturøkning i en enfasegenerator med dempevikling ved overlast. Generatoren er en del av en roterende frekvensomformer av typen Q48/Q49 som brukes av Jernbaneverket for å forsyne ... -
Beregning av generatorer ved modernisering av kraftverk
Lundseng, Aleksander; Vikan, Ivar (Master thesis, 2010)Bakgrunnen for dette prosjektet er det økte behovet for rehabilitering og oppgradering av vannkraftgeneratorer både i Norge og i resten av Europa. Behovet er basert på den store usikkerheten med å fastslå gjenstående levetid ... -
Breakdown strength of solid|solid interface
Hasheminezhad, Seyed Majid; Ildstad, Erling; Nysveen, Arne (Chapter, 2010) -
Charge accumulation in rod-plane air gap with covered rod
Mauseth, Frank (Doktoravhandlinger ved NTNU, 1503-8181; 2006:239, Doctoral thesis, 2007)The focus of this work has been on hybrid insulation in inhomogeneous electric fields under lightning impulse voltage stress. The principal idea behind hybrid insulation is the intentional use of surface charges to ... -
Common and differential mode of dc-bias in three-phase power transformers
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2022)Dc magnetization due to the geomagnetically induced currents (GICs) and HVDC (High Voltage Direct Current) systems may cause core saturation and result in serious destruction in the transformer performance as well as the ... -
Design and Manufacturing of a Twin Harmonic Machine with Counter-rotating Rotors
Bergesen, Samson (Master thesis, 2022)Konseptet med å drive to rotorer som kan rotere i separate retninger i samme stator ved å bruke harmoniske komponenter i et konsentrert viklingsoppsett i en overflatemontert permanentmagnetmotor har blitt undersøkt. ...