Browsing Institutt for elkraftteknikk by Title
Now showing items 1352-1371 of 2499
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Limitations and Guidelines for Damage Estimation Based on Lifetime Models for High-Power IGBTs in Realistic Application Conditions
(Peer reviewed; Journal article, 2020)Statistical lifetime models for high-power IGBTs are developed based on results from power-cycling experiments, and relate lifetime expectancy to the well-defined conditions of a laboratory experiment. In most cases, ... -
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 ... -
Limitations Regarding Use of the ABC-Model for Interpretation of Partial Discharge Measurements
(Journal article; Peer reviewed, 2019)The main purpose of the work presented here is to facilitate use of partial discharge (PD) measurements as a diagnostic tool for condition assessment of hydropower generator bars. The main aim of the work is to clarify how ... -
Limiting imbalance settlement costs from variable renewable energy sources in the Nordics: Internal balancing vs. balancing market participation
(Peer reviewed; Journal article, 2023)Due to the market gate closures in the Nordic energy markets, producers with variable renewable energy (VRE) assets, e.g., PV and wind power plants, must forecast their production prior to delivery, leaving room for ... -
Linking Global and Regional Energy Strategies (LinkS)
(SINTEF Energi. Rapport;, Research report, 2014)The LinkS project was designed to analyse how global long-term strategies can be used as guidelines for the development of energy supply and technology deployment in regional energy systems. In order to produce recommendations ... -
Livssyklusanalyse av offshore vindturbiner: Virkningen av å modellere gjennomsnittlige og væravhengige sviktrater
(Master thesis, 2011)Det er anslått 1 GW offshore vindkraftutbygging i Europa i løpet av 2011. Selv om teknologien har en eksponentiell utviklingskurve som stadig finner nye løsninger som gjør offshore vindkraft mer lønnsomt, er det forsatt ... -
Load Compensation by DSTATCOM with LCL-Filter by Comparing Different Resonance Damping Methods
(Chapter, 2020)This paper presents the design of a Distribution Static Compensator (DSTATCOM), interfacing the grid with an inductor-capacitor-inductor (LCL) filter, controlled by using dq0 current controller and sinusoidal pulse-width ... -
Load Current Interruption in Air for Medium Voltage Ratings
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:83, Doctoral thesis, 2014)Load break switches (LBSs) are common inside metal clad switchgear assemblies where space is a limiting factor. SF6 is usually used in this application due to its superior electrical characteristics, but is unfortunately ... -
Load Flow Analysis of Yggdrasil Power from Shore: Impact of Temperature Distribution in HVAC Subsea Cables
(Bachelor thesis, 2024)Yggdrasil er et nytt oljefelt med planlagt produksjonsstart i 2027. Området er designet for å bli forsynt med kraft fra land gjennom høyspennings vekselstrøms sjøkabler [1]. Tap i sjøkabler er temperaturavhengig og varierer ... -
Local Electric Field in Mass-Impregnated HVDC Cables
(Journal article; Peer reviewed, 2017)Detailed knowledge of the electric field in the insulation of mass-impregnated HVDC cables is important in order to understand their breakdown mechanisms and to improve their design. When calculating the local electric ... -
Local electricity market designs for interconnected nanogrids: Impact on rural electrification in Madagascar
(Peer reviewed; Journal article, 2024)Sustainable, reliable, and affordable energy access is a major challenge in many parts of the world. The paper addresses this challenge by proposing a local electricity market (LEM) design for nanogrids deployed in Madagascar. ... -
Local energy communities: Member benefits and grid impact under various regulatory frameworks
(Doctoral theses at NTNU;2024:231, Doctoral thesis, 2024)Due to global warming, there is a need to electrify fossil fuel processes and increase the amount of renewable energy. A way to include citizens in this green shift is by making it easier to invest in renewable technology ... -
Local Flexibility Market - TSO and DSO coordination
(Master thesis, 2022)Akkurat nå er det europeiske energisystemet i endring. Energien som produseres, kommer i større grad fra fornybar energi og desentralisert generasjon. Selv om dette har miljøfordeler, følger det også med en del tekniske ... -
Localisation of ground faults in power systems with distributed production
(Master thesis, 2008)Summary Distribution power systems experience a lot of faults due to high network utilisation and reduced investment in the infrastructure. Single phase faults are the most common. The standard distribution systems are ... -
Lokalisering av kortslutninger i høyspent distribusjonsnett
(Master thesis, 2017)I denne masteroppgaven er en foreslått metode for impedansbasert feillokalisering i høyspent distribusjonsnett presentert og testet. Metoden baserer seg på kortslutningsstrømmer som eneste måleverdi og tradisjonelle ... -
Long Step out Umbilicals for Oil and Gas Subsea Pump or Compressor Application - Starting of Permanent Magnet Machine
(Master thesis, 2012)Topside Variable Speed Drive (VSD) feeding a subsea load via a long cable is not a new technological challenge and many features in systems feeding asynchronous machines are well known. For a synchronous machine the situation ... -
Long Term Planning in Restructured power Systems: Dynamic Modelling of Investments on New Power Generation under Uncertainty
(Dr. ingeniøravhandling, 0809-103X; 2003:106, Doctoral thesis, 2003)This thesis describes the development of three decision support models for long-term investment planning in restructured power systems. The model concepts address the changing conditions for the electric power industry, ... -
Long-term hydrothermal Scheduling with aggregate and individual Reservoirs
(Master thesis, 2016)This thesis is a comparative analysis of two commensurable models used in long-term hydrothermal scheduling. The first model is the EMPS model, which is the most prevalent tool for long-term planning in the Norwegian power ... -
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 ...