Institutt for elkraftteknikk: Recent submissions
Now showing items 61-80 of 2468
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Tiltak for å redusere brannrisikoen i distribusjonstavler
(Master thesis, 2023)Masteroppgave handler om brannrisiko i elektriske sikringsskap og hvordan den kan re- duseres gjennom effektive brannsikringstiltak og forebyggende strategier. I oppgaven er det gjennomført en litteraturgjennomgang, ... -
Thermal Mapping of the Hydrogenerator’s Reactive Power Boosting Ability at Various Time Windows
(Chapter, 2023)In the future, bulk power generation facilities like large hydropower plants need to be utilized more flexibly and provide extended services over shorter time intervals. This work presents a comprehensive thermal mapping ... -
Ageing and Restoration of Transformer Windings
(Research report, 2001) -
High-Voltage Circuit Breaker Condition-Dependent Failure Rate with Covariates
(Peer reviewed; Journal article, 2024)High-voltage circuit breakers (HVCBs) are essential protection devices which should also be included in power system reliability analysis. When using Monte-Carlo simulation methods the reliability of individual components ... -
A Hybrid Current- and Voltage-Source Driver for Active Driving of Series-Connected SiC MOSFETs
(Peer reviewed; Journal article, 2024)The series-connection of silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors ( mosfet s) is an attractive way of increasing the blocking voltage capability of a switch. However, due to inherent transient ... -
Recursive Multi-Channel Prony for PMU
(Journal article; Peer reviewed, 2023)The phasor estimation process is important in monitoring, controlling and protecting power networks. Prony's method can be used as an estimator by which electrical power system parameters are approximated. The Prony algorithm ... -
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 ... -
Limitations in Impedance Reshaping of Grid Forming Converters for Instability Prevention
(Chapter, 2023)Under a weak grid scenario, Grid Forming (GFM) converters have superior impedance-based small-signal stability compared to Grid Following (GFL) converters. The underlying assumption in defining a weak grid has traditionally ... -
Impact of energy pricing regimes on production schedules under solar-hydro hybridization
(Chapter, 2023)Hybridization of complementary energy production increases system flexibility and allows optimization of energy and resource availability. Hydropower and floating solar photovoltaics (FPV) have a high potential for ... -
Segmentation Effects in the Modular HVDC Offshore Wind Generator and its Impact on Losses
(Chapter, 2023)Worldwide wind power capacity jumped from 7.5 GW in 1997 to 564GW by 2018, according to IRENA. Many regions of the world have strong wind speeds, but the best locations for generating wind power are often remote, where ... -
Eddy Current Loss in Grain-Oriented Steel Laminations due to Normal Leakage Flux
(Peer reviewed; Journal article, 2021)Leakage flux penetrating laminated iron cores in power transformers and large generators induces eddy current and local loss. Due to the strong magnetic anisotropy of the lamination structure, the penetrating flux tends ... -
Offshore wind farm site selection in Norway: Using a fuzzy trigonometric weighted assessment model
(Peer reviewed; Journal article, 2024)Maximising the energy potential of offshore wind farms requires an in-depth assessment of technological, economic, sociopolitical, and environmental aspects. Given the large economic impact of large-scale projects, a robust ... -
Optimal price-based scheduling of a pumped-storage hydropower plant considering environmental constraints
(Journal article; Peer reviewed, 2023)The paper proposes a novel medium-term scheduling model for a hydropower system composed by a pumped storage hydropower plant connected to a traditional hydropower plant subject to three types of environmental constraints; ... -
Long-term operational planning for flexible residential buildings with seasonal storage and capacity-based grid tariffs
(Peer reviewed; Journal article, 2024)When performing operation of the energy system in a building, it is difficult to accurately represent the uncertain long-term objectives in the short-term window, and the correlation between long-term objectives. This work ... -
Dynamic multi-agent dc-bus reconfiguration in modular motor drives with a stacked polyphase bridge converter
(Journal article; Peer reviewed, 2023)A stacked polyphase bridge converter consists of multiple standard, three-phase two-level voltage source inverters connected in series to the same dc voltage source. The authors present a decentralised and dynamic dc-bus ... -
Interactive protocols for distributed energy resource management systems (DERMS)
(Journal article; Peer reviewed, 2020)This paper proposes a novel approach to designing technical and financial protocols needed to support the penetration of distributed energy resources (DERs). It first formulates a complex, hard-to-implement, centralized ... -
Characterization of a novel counter-rotating twin harmonic PM machine
(Chapter, 2023)Most machine topologies have two-ports, with one set of electrical connections and one mechanical shaft. Three-port machines having two rotors and mechanical shafts are able to drive two mechanical loads using one stator ... -
Norwegian hourly residential electricity demand data with consumer characteristics during the European energy crisis
(Peer reviewed; Journal article, 2023)This dataset was collected to understand how Norwegian households responded to the electricity price shock due to the European energy crisis. It consists of consumer characteristics and their self-reported responses to the ... -
Accuracy Analysis of a Dynamic State Estimator with a Hardware in the Loop Approach
(IEEE Belgrade PowerTech;2023, Chapter, 2023)State estimation is critical for the monitoring and control of power systems. The conventional approach for state estimation is based on quasi static models for the power systems and as such neglects relevant dynamic ... -
Considerations on Combining Unfolding Inverters with Partial Power Regulators in Battery–Grid Interface Converters
(Peer reviewed; Journal article, 2024)The application of electrochemical cells as a source unit of electrical energy is rapidly growing—used in electric vehicles and other electric mobility devices, as well as in energy supply systems—as energy storage, often ...