Browsing NTNU Open by Author "Nøland, Jonas Kristiansen"
Now showing items 1-20 of 45
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A Non-normal-mode Marginal State of Convection in a Porous Box with Insulating End-Walls
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2019)The 4th order Darcy-Benard eigenvalue problem for the onset of thermal convection in a 3D rectangular porous box is investigated. We start from a recent 2D model for a rectangle with hand-picked boundary conditions defying ... -
A Non-normal-Mode Marginal State of Convection in a Porous Rectangle
Tyvand, Peder A.; Nøland, Jonas Kristiansen; Storesletten, Leiv (Journal article; Peer reviewed, 2019)The fourth-order Darcy–Bénard eigenvalue problem for onset of thermal convection in a 2D rectangular porous box is investigated. The conventional type of solution has normal-mode dependency in at least one of the two spatial ... -
Adaptive Neural Network-based PSS Designs for Modern Power Systems
Grong, Thomas (Master thesis, 2020)Når andelen av fornybar energi i et kraftsystem øker, endres systemets egenskaper på en merkbar måte. Fornybare energikilder som solcelleanlegg og vindturbiner skaper mer hyppige forstyrrelser, men bidrar ikke til å ... -
Analysis and Optimization of a Passive Magnetic Bearing
Tungesvik, Sindre (Master thesis, 2020)Den økende bruken av roterende høyhastighetsmaskiner gir utfordringer relatert til friksjon, levetid til kulelager og vibrasjoner. En interessant løsning til dette er magnetiske lagre, hvor kontaktfri sveving er oppnådd i ... -
Analytical Iron Loss Evaluation in the Stator Yoke of Slotless Surface-Mounted PM Machines
Leandro, Matteo; Elloumi, Nada; Tessarolo, Alberto; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2022)One of the attractive benefits of slotless machines is low losses at high speeds, which could be emphasized by a careful stator core loss assessment, potentially available already at the pre-design stage. Unfortunately, ... -
An Analytical Model for Detailed Transient Fault Analysis of Doubly-Fed Induction Machines
Maurer, Frederic; Nøland, Jonas Kristiansen (Chapter, 2020)This paper presents an exact analytical solution to the two-phase and three-phase short-circuit events of the doubly-fed induction machine (DFIM). The contribution is intended to strengthen the predictability of DFIMs under ... -
An Analytical Prediction Model of Balanced and Unbalanced Faults in Doubly-Fed Induction Machines
Frédéric, Maurer; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2022)This paper presents the exact transient solution to the unbalanced and balanced faults in the doubly-fed induction machine (DFIM). Stator currents, rotor currents, and stator fluxes have been validated using simulation and ... -
Analytical-Based Iron Loss Assessment in the SPM Slotless Machine Stator Core
Leandro, Matteo; Nada, Elloumi; Tessarolo, Alberto; Nøland, Jonas Kristiansen (Chapter, 2020)The use of slotless machines has acquired growing interest when features such as low vibrations and noise, along with low losses at high speed, are required. However, a careful assessment of the iron losses in the stator ... -
An Approach for Optimal Pre-Conditioning of the Analytical Field Solution of Slotless PM Machines
Leandro, Matteo; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2021)Analytical modeling of electrical machines has the advantage of remarkable computational efficiency when compared with finite element analysis (FEA). This is especially important for slotless topologies, as they are well ... -
Assessing the Feasibility of Developing a High-Speed SynRM by Using a Compound Analytical/FEA-Assisted Design Algorithm
Carlsen, Tord Traa (Master thesis, 2021)Det siste tiåret har det vært en markant økning i interessen for synkron-reluktansmotorer. Dette skyldes i hovedsak lave produksjonskostnader, økte svingninger i prisen på permanentmagneter og synkron-reluktansmotorens ... -
Back-to-Back Based Voltage Control of an Isolated Grid Supplied by a Hydro Turbine Driven Induction Generator
Krakk, Eivind (Master thesis, 2020)Dagens samfunn er heilt avhengig av elektrisitetsforsyning. Samankopla transmisjonsnett er lett tilgjengelege over heile verda. Likevel, i rurale områder utan nokon form for eksisterande nettinfrastruktur, kan eit isolert ... -
Coordinated Multi-objective tuning of PSS and AVR
Hansen, Vard Nes (Master thesis, 2021)Spenningsregulatoren (AVR) i en generator sørger for å holde terminalspenningen konstant ved å regulere feltspenningen som tilføres feltviklingene. Synkrongeneratorer kan utstyres med dempetilsats (PSS) som motvirker ... -
A Differential Strand-Slot Inductance Model for Improved Compensation of Circulating Currents in the Core Part of Large AC Machines
Frédéric, Maurer; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2021)The Roebel bar conventional design of large AC machines uses the classical strand-slot inductance model (CSSIM). Suitable alternatives are missing as the CSSIM is favored for its inherent simplicity based on the ideally ... -
Dual Use of Liquid Hydrogen in a Next-Generation PEMFC-Powered Regional Aircraft with Superconducting Propulsion
Hartmann, Christian Magnus; Nøland, Jonas Kristiansen; Nilssen, Robert; Mellerud, Runar (Peer reviewed; Journal article, 2022)In this paper, we present a comprehensive model framework for a disruptive cryo-electric propulsion system intended for a hydrogen-powered regional aircraft. The main innovation lies in the systematic treatment of all the ... -
Electrical Machines and Power Electronics for Starter-Generators in More Electric Aircrafts: A Technology Review
Nøland, Jonas Kristiansen; Leandro, Matteo; Suul, Jon Are Wold; Molinas Cabrera, Maria Marta; Nilssen, Robert (Chapter, 2019)Safety-critical power conversion systems play a major role in the paradigm shift towards more electric aircraft (MEA) architectures. This paper reviews the electrical machines and their power electronic systems that are ... -
Enhanced Power Capability of Generator Units for Increased Operational Security using NMPC
Øyvang, Thomas; Nøland, Jonas Kristiansen; Sharma, Roshan; Hegglid, Gunne John; Lie, Bernt (Journal article; Peer reviewed, 2019)The ever-increasing penetration of intermittent energy sources introduces new demanding operating regimes for the bulk power generation in the power grid. During a worst-case power system disturbance scenario, the generator ... -
Evolving Toward a Scalable Hyperloop Technology: Vacuum transport as a clean alternative to short-haul flights
Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2021)The future transformation of transportation is set to fundamentally shape our modern civilization in reducing the global energy consumption from travel and the time needed to move. In the future climate vision of the ... -
Excitation System Technologies for Wound-Field Synchronous Machines: Survey of Solutions and Evolving Trends
Nøland, Jonas Kristiansen; Nuzzo, Stefano; Tessarolo, Alberto; Alves, Erick Fernando (Journal article; Peer reviewed, 2019)Wound-field synchronous machines (WFSMs) are included in the majority of large power generating units and special high-power motor drives, due to their high efficiency, flexible field excitation and intrinsic flux weakening ... -
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 ... -
Generalized and Reduced Analytical Formulation for Ultra-Fast 3-D Field and Vector Potential Calculation from Arch-Shaped Axially Magnetized Bodies in Electrical Machines
Maurer, Frederic; Kawkabani, Basile; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2020)Arch-shaped axially magnetized bodies tend to appear frequently in electrical machine analysis such as in overhang parts of classical radial-flux machines as well as in main parts of axial-flux machines. The calculation ...