Browsing NTNU Open by Author "Nøland, Jonas Kristiansen"
Now showing items 1-11 of 11
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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 ... -
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 ... -
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 ... -
Online parameter identification of synchronous machines using Kalman filter and recursive least squares
Alves, Erick Fernando; Nøland, Jonas Kristiansen; Marafioti, Giancarlo; Mathisen, Geir (Chapter, 2019)This paper investigates and implements a procedure for parameter identification of salient pole synchronous machines that is based on previous knowledge about the equipment and can be used for condition monitoring, online ... -
Onset of Convection in a Triangular Porous Prism with Robin-Type Thermal Wall Condition
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2019)This paper investigates a peculiar case of thermal convection in a vertical porous prism with impermeable and partially conducting walls. We facilitate the analysis in the numerical finite-element environment alongside ... -
Oscillatory Non-normal-Mode Onset of Convection in a Porous Rectangle
Tyvand, Peder A.; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2019)A special case of the fourth-order Darcy–Bénard problem in a two-dimensional (2D) rectangular porous box is investigated. The present eigenfunctions are of non-normal-mode type in the horizontal and vertical directions. ... -
Rapid 3-D Magnetic Integral Field Computation of Current-Carrying Finite Arc Segments with Rectangular Cross-Section
Maurer, Frederic; Kawkabani, Basile; Nøland, Jonas Kristiansen (Journal article; Peer reviewed, 2020)The computation of three-dimensional (3-D) magnetic fields is a demanding task in the analysis of electrical machines and other electromagnetic devices. In this context, integral field calculation provides a smooth solution, ... -
Systemdrift 2020
Christoffersen, Fredrik Vigeland; Handeland, Tine; Grande, Tove Rømo; Nøland, Jonas Kristiansen; Øberg, Martha Marie; Ødegaard, Leiv Erik (Research report, 2012)KUBE 2012 har i årets sommerprosjekt svart på problemstillingen: Hvordan bør Statnett drifte kraftsystemet i 2020? Utviklingen av systemdriften frem mot 2020 vil drives av en kraftig økning i utvekslingskapasitet mot ... -
Unified Reduced Model for a Dual Control Scheme of the High-Speed Response Brushless Excitation System of Synchronous Generators
Nøland, Jonas Kristiansen; Alves, Erick Fernando; Pardini, Atila; Lundin, Urban (Journal article; Peer reviewed, 2019)Developments of the high-speed response brushless excitation systems (HSRBESs) are ongoing in the power industry. This is because the transient response of the excitation system (ES) is a key performance indicator for the ...