Browsing NTNU Open by Author "Nilsen, Roy"
Now showing items 1-20 of 35
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A 1 kW PFC converter with GaN-transistors and planar magnetics
Engetrøen, Ådne Finnes (Master thesis, 2019)Auka krafttettleik, kostnadsreduksjon, auka effektivitet og auka driftssikkerheit er fire av dei viktigaste målsetjingane i halvleiarindustrien i dag. Ved bruk av GaN-halvleiarar er fleire av desse målsetjingane innan ... -
Active Compensation of Unbalanced Load Currents in Grid Connected Voltage Source Converters
Tiwari, Raghbendra; Nilsen, Roy (Chapter, 2019)For a 2-level 3-phase voltage source converter connected to the grid, it should be capable of supporting the grid with maximum possible active and reactive power during balanced and unbalanced load condition. This paper ... -
Active Front End Converter Used in Adjustable Speed Hydro
Romero Amaya, Jose Armando (Master thesis, 2019)A consistent part of the research in the hydropower field in Norway is being done at NTNU. The Faculty of Information Technology and Electrical Engineering is an active player in this research through the Department of ... -
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. ... -
An investigation on modeling principles and ageing behaviour of the lithium ion battery
Pettersen, Fredrik (Master thesis, 2020)Denne masteroppgaven omhandler batteriteknologi med fokus på litium-ionbatteriet. Litium-ionbatteriet er den dominerende batteriteknologien på markedet i dag og benyttes i et bredt spekter av applikasjoner, alt fra små ... -
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 Loss Equations for Three Level Active Neutral Point Clamped Converters
Tiwari, Raghbendra; Nilsen, Roy (Chapter, 2020)This paper presents the analytical expressions that can be used to calculate conduction and switching losses in each devices of an Active Neutral Point Clamped Converter. These expressions can be used to determine the ... -
Automotive Drive for a Formula Student Racecar
Skeie, Håkon K. (Master thesis, 2019)Den knappe mengden tilgjengelige drivsystemer for Formula Student-racerbiler gir mulighet til å øke bilens ytelse med innføring av spesialbyggede, egenutviklede systemer. For 2019-sesongen ønsket Revolve NTNU å implementere ... -
Comparison between Si MOSFETs and GaN HEMTs with special emphasis on low load problems occuring in the LLC resonant converter
Blingsmo, Lyder Rumohr (Master thesis, 2019)Det stilles store krav til likerettere brukt til å forsyne datasentere med kraft. Et av kravene er høy virkningsgrad. En av de vanligste topologiene brukt til dette formålet består av en PFC-likeretter, for å få sinusformet ... -
Control of Medium Voltage Multi-phase machines: Implementation of Minimum loss Synchronous Optimal Modulation with Neutral Point Balancing
Neupane, Krishna (Master thesis, 2014)The total loss of an inverter can be reduced by reducing switching losses and harmonics losses. However, the harmonics increases with the reduction of switching frequency and special technique is required to get the overall ... -
Control of Six-Phase Machines
Hoem, Øivind Michael Molnes (Master thesis, 2010)The purpose of the work presented in this report was to continue the study of a six phase dual winding IPMSM with split dc-link conducted in [1]. The setup has been proposed as a means to improve the power ratings of ... -
Design and Analysis of Stationary Reference Frame Controllers for Active Front End Converter
Holter, Arne Sigurd (Master thesis, 2016)An active front end converter along with its associated control system has been the scope of this thesis. Relavant literature has been considered for identifying the operation and possible system implementations of this ... -
Evaluation of Power Losses and Ruggedness of SiC MOSFETs for use in High-Power High-Frequency Induction Heating Generators
Haukelidsæter, Knut (Master thesis, 2018)As the Si IGBTs are confronting its physical limitations when it comes to high-frequency high-power applications, the SiC MOSFET sails up as a promising substitute due to its material properties. However, in the process ... -
A Framework and an Open-Loop Method to Identify PMSM Parameters Online
Perera, Aravinda; Nilsen, Roy (Chapter, 2020)A method for online adaptation of electric parameters of a rotating machine is proposed herein. The concept adopts the recursive prediction error method (RPEM) for parameter adaptation, that exploits the prediction-error ... -
Inductor Design for Filter Applications with high dV/dt
Solbakken, Yngve Berset (Master thesis, 2016)The work in this report has consisted in the design of three different inductors to verify how conductor profile impact stray capacitance, and how stray capacitance impact filtering performance. The three conductor ... -
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 ... -
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) ... -
Lab Setup and Testing of Lithium-Ion Batteries with Focus on Dynamic and Aging Modeling
Molund, Eirik (Master thesis, 2013)This report presents the work on making a lab setup for testing of different types of batteries in the energy storage lab at NTNU/SINTEF. A complete lab setup has been made and two different LiFePO4 chemistry cells of size ... -
Modeling and Control of a DC-grid Hybrid Power System with Battery and Variable Speed Diesel Generators
Syverud, Tron Hansen (Master thesis, 2016)Hybrid electric power systems (HPS) have successfully been integrated in the road-traffic industry due to enhanced efficiency and environmental benefits. Recently this concept has been implemented in the marine sector. In ... -
Modeling of a Maritime DC-distribution System Supplied from a Diode Rectifier Connected Synchronous Generator
Ytrehus, Arve Starheim (Master thesis, 2019)Strenge utslippsreglement har blitt introdusert i den maritime sektor av den Internasjonale Maritime Organisasjon. Ny og eksiterende teknologi er analysert med høyt fokus på å utvikle mer miljøvennlige løsninger. DC ...