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Investigation of the Effect of Operating Conditions on Reliability of DC-link Capacitors in Microgrids
(Chapter, 2020)This paper considers a microgrid system where the impact of different non-ideal operating conditions on the reliability of the DC-link capacitor in three phase inverter systems is investigated. Rather than focusing on the ... -
INVESTIGATION OF THE MATRIX CONVERTER IN A DC SERIES-CONNECTED WIND FARM: Modulation, Control and Efficiency
(Doctoral thesis at NTNU;2016:16, Doctoral thesis, 2016)In this thesis a wind energy conversion system for series-connection of DC wind turbines is considered. The wind park topology offers the advantage of a high voltage transmission without the need of an offshore platform ... -
Investigation of the Transient Recovery Voltage across Circuit Breakers in Networks with Distributed Energy Resources
(Master thesis, 2019)Tilkoblingen av små-skala kraftproduksjon i distribusjonsnettet har mange positive sider. Dette innebærer blant annet reduserte kostnader relatert til re-investering i transmisjonslinjer, økt pålitelighet, og en økt andel ... -
Investigation of various solutions for improved voltage quality in weak distribution networks
(Master thesis, 2018)This thesis is investigating several solutions to improve voltage stability and the short circuit capacity of weak distribution networks. In order to do so electric machines are added to the grid and their impact is ... -
Investigation on Fault Current Making in Medium Voltage Switchgear in Air
(Doctoral theses at NTNU;2022:106, Doctoral thesis, 2022)Closing a switch under a fault condition could result in extensive electrical contact wear and a possible switch failure. A load break switch (LBS), as one of the critical components in medium voltage (MV) power grids, ... -
Investigation on Fault-ride through Methods for VSC-HVDC Connected Offshore Wind Farms
(Journal article; Peer reviewed, 2016)This paper proposes a novel fault-ride through method for offshore wind farms connected to grid through a voltage source converter (VSC)-based high voltage direct current (HVDC) transmission. The proposed method introduces ... -
Investigation on Fault-ride Through Methods for VSC-HVDC Connected Offshore Wind Farms - Overview and New Proposal for Fault Ride Through
(Master thesis, 2015)Recently, there has been a fast development and deployment of wind energy to meet the increasing electrical power demand and to limit the use of fossil fuels. More and more wind farms are planned far from shore because of ... -
Investigations on Secondary Voltage Control for Long-Term Reactive Power Management
(Chapter, 2023)Voltage and reactive power management is a crucial task for system operators worldwide, and particularly in Norway. While manual operations within regional control cen-ters were once the norm, a major shift is currently ... -
Investment Analysis for Residential Storage and PV Systems under Spanish Grid Tariffs
(Master thesis, 2020)The elimination of the so-called solar-tax in Spain at the end of 2018, which had earlier made investment in residential PV systems unattractive, has opened a new horizon for self-consumption and thereby providing an ... -
Investment Analysis with the EMPS Model with Emphasis on Central Norway
(Master thesis, 2010)Central Norway has had a significant growth in power consumption over the last few years, and demand is expected to rise. Due to lack of investment in sufficient generation and transmission capacity, Central Norway is ... -
Investment Analysis with the EMPS Model with Emphasis on Transmission Capacity Increase to other Power Systems
(Master thesis, 2010)The EMPS model is a fundatmental model for optimizing and simulation of power systems with substantial amounts of hydro power, developed by SINTEF Energy Research. Recently SINTEF Energy Research developed investment ... -
Investments in Low-Carbon Power Generation and Energy Storage under Uncertainty
(Master thesis, 2023)Denne masteroppgaven analyserer hvordan usikkerhet, ulike grader av risikoaversjon og ulike klimatiltak påvirker investeringene i, og dermed dekarboriseringen av kraftsystemet. Store investeringer innen fornybar kraftproduksjon ... -
IRONLESS PERMANENT MAGNET GENERATORS FOR DIRECT-DRIVEN OFFSHORE WIND TURBINES
(Doctoral thesis at NTNU;2015:138, Doctoral thesis, 2015)Since the beginning of this century, the offshore wind power industry has witnessed fast development, as the result of the increasing awareness of climate change and the need for diversifying power supply. Offshore has ... -
Islanded Microgrids: a Predictive Approach to Control Operation
(Master thesis, 2020)Bygging av mikronett i øydrift er et alternativ for å levere energi til avsidesliggende områder. For å bidra til det grønne skiftet er alternativer som bruker fossile brennstoff ikke aktuelle. Væravhengige energikilder er ... -
Isolated Full-Bridge DC-DC Converter Configurations for Photovoltaic Applications using Modular Multilevel Converter
(Master thesis, 2018)As a result of the continuously increasing carbon emissions, the global demand for cleaner energy is rising. Grid-connected photovoltaic (PV) systems is an attractive solution to provide green energy, and PV technology has ... -
Isolated High-Frequency Link PFC Rectifier With High Step-Down Factor and Reduced Energy Circulation
(Peer reviewed; Journal article, 2022)This article presents an isolated single-stage ac–dc high-frequency link full-bridge cycloconverter (HFLC) with high conversion ratio. Despite certain advantages, such topologies gen- erally suffer from transformer leakage ... -
Joint Modelling of Wind Power and Hydro Inflow for Power System Scheduling
(Peer reviewed; Journal article, 2016)This paper concerns the joint modelling of wind power and hydro inflow for long-term power system scheduling. We propose a vector autoregressive model applied to deseasonalized series to describe the joint generating ... -
Joint optimization of preventive and condition-based maintenance for offshore wind farms
(Peer reviewed; Journal article, 2022)High costs of maintenance and lost production during downtime are a challenge to the offshore wind industry, and there is a great potential to improve cost efficiency by improved maintenance and control strategies utilizing ... -
Jordfeil i Spolejordet Regionalnett.
(Master thesis, 2019)En forenklet modell av Nordnettet er etablert i programvaren ATP Draw. Modellen er designet for å analysere jordfeilstrømmer, spenning og resonanskurve. Den er bygd opp slik at man selv kan stille inn spoleinnstillingene ... -
Jordfeildeteksjon i spolejorda distribusjonsnett: Mulige årsaker til utilsiktet utfall av linjer i Fillan transformatorstasjon
(Master thesis, 2007)I denne oppgaven er det sett på nullpunktspenninger i det spolejordete Fillan-nettet på Hitra. Grunner til variasjoner i nullpunktspenningen er undersøkt, spesielt med hensyn å avdekke hvorfor man i noen tilfeller får ...