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Excitation System Technologies for Wound-Field Synchronous Machines: Survey of Solutions and Evolving Trends
(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 ... -
Expansion of Offshore HVDC Grids. An overview of contributions, status, challenges, and perspectives.
(Chapter, 2017)The goal of this paper is to review, systematize and critically discuss the approaches that have been proposed so far for grid transmission expansion in HVDC systems. In particular, the paper will focus on the special ... -
An expansion planning method for extending distributed energy system lifespan with energy storage systems
(Peer reviewed; Journal article, 2021)The recent advances in the modern power grids, such as growing energy demand and penetration of higher amounts of distributed energy generators like renewable energy resources, caused additional grid integration challenges ... -
An Expeditious Algorithm for Identification and Classification of Rotor Faults in Salient Pole Synchronous Generators
(Peer reviewed; Journal article, 2023)Providing secure electricity depends on the reliable operation of the synchronous generators in power plants. Interturn short-circuit (ITSC) and dynamic eccentricity (DE) faults are among the most prevalent fault types in ... -
Experimental and numerical investigation of oil-water separation
(Master thesis, 2014)Separation of oil-water mixtures is essential to prepare the productsprior to transportation. This is, among others things, due to salesspecifications, minimisation of corrosion, and reduction of transporta-tion costs. The ... -
Experimental Determination of Losses in MgB2 Superconductors for Wind Turbine Applications
(Master thesis, 2017)Superconducting generator field windings are suggested for the next generation of wind turbines. The foreseen wind turbines with power ratings greater than 10 MW give raise to technical challenges. Superconducting field ... -
Experimental evaluation of SiC-based medium voltage Series Resonant Dual-Active-Bridge three-level DC/DC converters for EV charging
(Chapter, 2023)This paper compares two topologies of SeriesResonant Dual-Active-Bridge (SRDAB) converters with threelevel input applied for EV charging from medium voltage (MV) bipolar DC-link. To convert such a voltage with the utilization ... -
Experimental Investigation of Operational Reliability of Silicon Carbide MOSFETs
(Master thesis, 2017)As the performance of silicon power semiconductors is close to the theoretical limit, other semiconductor materials are sought to improve power electronics system efficiency. Devices made with the wide bandgap material ... -
Experimental investigation on ablation-assisted current interruption - Experimental setup and preliminary results
(Chapter, 2016)This paper presents a flexible setup to investigate ablation-assisted interruption of load currents. The electrical test circuit is grid connected with a transformer secondary voltage from 6.9 kV to 24 kV. The applied ... -
Experimental performance comparison of six-pack SiC MOSFET and Si IGBT modules paralleled in a half-bridge configuration for high temperature applications
(Chapter, 2016)—In this paper, the switching performance of asix-pack SiC MOSFET module (CCS050M12CM2) is inves-tigated experimentally using a standard double pulse testmethod. The upper three and the lower three MOSFETsof the ... -
Experimental performance evaluation of two commercially available, 1.2 kV half-bridge SiC MOSFET modules
(Chapter; Peer reviewed, 2016)In this paper, the switching performances of two state-of-the-art half-bridge SiC MOSFET modules are evaluated using a standard double pulse test methodology. The selected modules are commercially available, and have the ... -
Experimental Set-up for partial discharge detection
(Master thesis, 2015)Offshore HVDC overføringssystemer bruker omformerstasjoner mellom AC- og DC-kraftnettet. Likespenning fra omformerstasjonene vil inneholde transienter. Disse ligger i området 1 til 10 \% av den nominelle likespenningen, ... -
Experimental Studies of Streamer Phenomena in Long Oil Gaps
(Doctoral Theses at NTNU, 1503-8181; 2013:106, Doctoral thesis, 2013)In this study, the characteristics of non-breakdown and breakdown streamers have been investigated through the effects of dissolved gases/air, carbon particles, additives, reduced pressure, liquid chemistry and voltage ... -
An Experimental Study of Short-Circuit Current Making Operation of Air Medium-Voltage Load Break Switches
(Peer reviewed; Journal article, 2022)Replacing SF 6 , the most potent greenhouse gas, with an alternative gas is a challenge faced by medium-voltage load break switches (MV-LBS). Air is a possible alternative, but there are some challenges regarding low ... -
Experimental study on fast-switching series-connected SiC MOSFETs
(Chapter, 2017)This paper presents an experimental study on series-connection of Silicon Carbide MOSFETs. The switching performance of two series-connected SiC MOSFETs rated at 1200 V and having on-state resistances of 80 mΩ was tested ... -
Experimental validation of a new impedance based protection for networks with distributed generation using co-simulation test platform
(Peer reviewed; Journal article, 2019)Combined real-time hardware-in-the-loop simulations and modeling of communication networks (co-simulation platforms) is a powerful test-bed for development and validation of relay protection schemes utilizing communication ... -
Experimental Verification of a Voltage Droop Control for Grid Integration of Offshore Wind Farms Using Multi-terminal HVDC
(Journal article; Peer reviewed, 2014)This paper presents an experimental verification of a voltage droop control for a multi-terminal HVDC system for the grid integration of offshore wind farms. The laboratory setup is composed by four voltage-source converter ... -
Experimental verification of control methods for series connected VSCs applied to a modular HVDC power train for offshore wind
(Master thesis, 2023)I denne avhandlingen har strømkontroll og spenningsbalanseringskontroll av serie koblede modulære spenningskildeomformere (VSC) blitt testet eksperimentelt og gjennom simuleringer. Forskingen gjort i sammenheng med denne ... -
Expert system for hydropower stations developed in Volve Knowledge Tools
(Master thesis, 2008)Despite the fact that hydropower stations are equipped with the latest technology in both regulation and remote control, it is not enough to replace the traditional machine expert. The machine expert was a person stationed ... -
Exploring a Modulation Strategy by Experiments for Modular Multilevel Converter in Faulty Operation
(Chapter, 2017)Modular Multilevel Converter (MMC) technology is rapidly evolving, and research is ongoing to make the MMC suitable for more applications. This topology comprises multiple Sub-Modules (SM) to form the output voltage levels ...