Blar i Institutt for elkraftteknikk på tittel
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Long-term Peak Power and Energy Forecasting in Norwegian Electricity Grids
(Master thesis, 2021)Elkraftbransjen opplever i disse tider store endringer og rask utvikling innenfor mange teknologiske områder. Innføringen av grønne teknologier og flere digitale løsninger legger grunnlag for nye muligheter for produsenter, ... -
Long-term Scheduling of Hydro Power Systems in Multiple Markets
(Master thesis, 2015)Hydropower scheduling models are vital for achieving an optimal utilization of water stored in reservoirs. The high percentage of flexible hydropower generation in Norway has led to scarce volumes in the reserve markets, ... -
A Long-term Strategy Framework for Flexible Energy Operation of Residential Buildings
(Doctoral theses at NTNU;2022:251, Doctoral thesis, 2022)Within the European power system, the electricity mix is experiencing more presence of variable power production due to the green shift. This shift causes increased need for flexibility measures to combat instability, which ... -
Long-term Value of Flexibility from Flexible Assets in Building Operation
(Peer reviewed; Journal article, 2022)In this work, we investigate how flexible assets within a residential building influence the long-term impact of operation. We use a measured-peak grid tariff (MPGT) that puts a cost on the highest single-hour peak import ... -
Longitudinal AC Breakdown Voltage of XLPE-XLPE Interfaces Considering Surface Roughness and Pressure
(Journal article; Peer reviewed, 2017)The interfacial breakdown between two dielectric surfaces has been reported to represent one of the principal causes of failure for power cable joints and connectors; thus, a better understanding of interfacial breakdown ... -
Longitudinal AC Electrical Breakdown Strength of Polymer Interfaces: Experimental and theoretical examination of solid-solid interfaces considering elasticity, surface roughness, and contact pressure
(Doctoral theses at NTNU;2019:93, Doctoral thesis, 2019)All electrical insulation systems consist of a combination of different insulating and conductive materials. The alternating current (AC) breakdown strength (BDS) of insulation systems is limited by the lowest BDS of either ... -
Loss Analysis in Laminated Iron Cores using COMSOL Multiphysics and LiveLink for Matlab
(Master thesis, 2018)A framework for loss analysis using COMSOL and LiveLink for Matlab is presented in this thesis. The loss analysis is based on Steinmetz' theory on iron core losses. IEC standard 60404-8-4:2013 gives a method of presenting ... -
Loss Calculations on Roebel-bars using Finite Element Analysis
(Master thesis, 2008)This thesis concern 3D modeling and loss calculations on roebel-bars. The finite element program ANSYS has been used to do loss calculations on transposed as well as on untransposed conductors in order to investigate how ... -
Loss Modeling of Large Hydrogenerators for Cost Estimation of Reactive Power Services and Identification of Optimal Operation
(Peer reviewed; Journal article, 2022)As a result of the worldwide energy transition, reactive power generation has started to become a more scarce resource in the power grid. Until recently, reactive power has been an auxiliary grid service that classical ... -
Losses and Inductive Parameters in Subsea Power Cables
(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 ... -
Low Frequency AC Transmission - Investigating the Dynamics of an Export Cable for Offshore Wind Power Applications
(Master thesis, 2016)In the following thesis, the properties of a 16 2/3 Hz, low frequency alternating current (LFAC) export cable was examined in both steady state and dynamic conditions, as part of a simplified offshore transmission system. ... -
Low Frequency Alternating Current (LFAC) Transmission Systems for Offshore Wind Farms - Case Studies on the Use of LFAC, Based on Horns Rev 3 Offshore Wind Farm
(Master thesis, 2017)This thesis investigates the use of low frequency alternating current (LFAC) for the longdistance transmission of the power extracted from offshore wind farms. It is based on the measurement of power flow in different nodes ... -
Low Inductive Characterization of Fast-Switching SiC MOSFETs and Active Gate Driver Units
(Peer reviewed; Journal article, 2023)Accurate switching device characterization is necessary for effectively utilizing the technological advantages of Silicon Carbide (SiC) Power Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) over their Silicon ... -
Low Inductive Platform for Long- and Short-term Dynamic Charaterization of SiC MOSFETs
(Chapter, 2022)State-of-the art Silicon Carbide Power MOS-FETs switch at unprecedented speed. Therefore, special attention must be paid to the circuit design of dynamic characterization setups. Only if parasitic layout inductances are ... -
Low Short-Circuit Ratio Connection of Wind Power Plants
(Master thesis, 2015)Primary factor for the site selection during the planning process of the large modern wind farms is the wind climate, which is usually favorable at remote and offshore locations where the public grid is not particularly ... -
Low switching frequency modulation scheme for high power three level converters: FPGA based implementation
(Master thesis, 2013)The demand for electrical motors with high power ratings is increasing in different applications, especially in the offshore industry. The power rating of these motors can be raised by increasing the voltage at the motor ... -
Low-complexity online estimation for LiFePO4 battery state of charge in electric vehicles
(Journal article; Peer reviewed, 2018)This paper proposes a low-complexity online state of charge estimation method for LiFePO4 battery in electrical vehicles. The proposed method is able to achieve accurate state of charge with less computational efforts in ... -
Lønnsom plassering av fjernstyrte brytere i distribusjonsnettet
(Bachelor thesis, 2023)I denne oppgaven har det blitt gjennomført en grundig undersøkelse av den optimale plasseringen av fjernstyrte brytere basert på KILE-kostnader, lønnsomhetsanalyser og en regneverktøy. Casestudien ble gjennomført i samarbeid ... -
Lønnsomhet i produksjon i et system med en stor andel fornybar energi
(Master thesis, 2014)Denne masteroppgaven omhandler det Nordeuropeiske kraftsystemet med en høy andel fornybar energi. Det ble undersøkt hvilke utfordringer, knyttet til økonomi og marked, som oppstår i kraftsystemet med en høy andel fornybar ... -
Machine Learning for PV System Operational Fault Analysis: Literature Review
(Chapter, 2022)This review paper aims to discover the research gap and assess the feasibility of a holistic approach for photovoltaic (PV) system operational fault analysis using machine learning (ML) methods. The analysis includes the ...