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Switching sequences for non-predictive declutching control of wave energy converters
(Peer reviewed; Journal article, 2021)Aiming at improving the energy absorption from waves, a number of studies have considered declutching control - a phase-control method that consists of disengaging the power take-off (PTO) system from the oscillating body ... -
Synchronization properties of Voltage Source Converters when seen as Coupled Oscillators based on the Kuramoto Model
(Chapter, 2018)This paper presents an alternative framework for comparing the synchronization properties of two different control techniques for Voltage Source Converters (VSC) using the Kuramoto equivalent model as a basis. The traditional ... -
Synchronous Optimal Modulation for Medium voltage Multi-phase Machines: Implementation of three-level modulators in Field Programmable Gate Arrays
(Master thesis, 2013)The advancement in power electronics devices like Insulated Gate Bipolar Transistors (IGBT) has increased the low voltage ac drive to the medium voltage drive system. These IGBTs have higher voltage capability. For eliminating ... -
Synthetic Inertia from a Converter-Fed Synchronous Machine in a Hydro-Electric Power Plant - Modeling, Control and Analysis
(Master thesis, 2018)As the share of variable renewable energy in the power system rises, the demand for balancing technologies to compensate for fluctuation in production increases. Pumped-storage hydropower has significant potential globally ... -
Synthetic Inertia from Wind Farms - Impacts on Rotor Angle Stability in Existing Synchronous Generators
(Master thesis, 2014)As the share of wind power in the power system rises, synchronous generators in traditional power plants are taken out of the grid and replaced by a large number of wind turbines. Most modern wind turbines utilize a power ... -
Synthetic Inertia from Wind Farms - Impacts on Rotor Angle Stability in Existing Synchronous Generators
(Master thesis, 2014)As the share of wind power in the power system rises, synchronous generators in traditional power plants are taken out of the grid and replaced by a large number of wind turbines. Most modern wind turbines utilize a power ... -
Synthetic Inertia Provision from Variable Speed Turbines and HVDC in the Nordic Power System
(Master thesis, 2021)Behovet for energikilder med lavt utslipp vokser, og i fremtiden er det naturlig å se for seg et kraftsystem der fornybare energikilder utgjør en større andel av kraftproduksjonen. Den økende andelen av fornybar energi i ... -
System Analysis of Large-Scale Wind Power Integration in North-Western Europe: A study on the impact of large-scale wind power expansion and on the impact of a North Sea offshore grid
(Master thesis, 2009)Problem description: The objective of this project was to create a simple model of the European power system and to investigate the effect an increasing amount of on- and offshore wind power will have on the North European ... -
System Design and Analysis of Electricity Provision for a Desalination Plant: A Study for Pozo Colorado, Paraguay
(Master thesis, 2014)Fresh water scarcity and drinking water quality is a challenge in Pozo Colorado, a district in the northern part of Paraguay. The area has groundwater resources that have not yet been exploited, but this water is saline ... -
System Design and Balancing Control of the North Sea Super Grid
(Doctoral Theses at NTNU, 1503-8181; 2013:311, Doctoral thesis, 2013)The construction of the North Sea Super Grid is the major step towards meetingthe future demand for electric power transmission in northern Europe. This gridwill likely also extend onshore towards the load centres, and ... -
System Design and Configuration of a Stand-Alone PV-Biomass Micro Grid: An Application for Wawashang, Nicaragua
(Master thesis, 2014)In this thesis, an evaluation of a stand-alone hybrid micro grid for the Wawashang Complex is presented. A solution for a new electricity supply and distribution system for the complex is proposed with a focus on optimal ... -
System impact studies for near 100% renewable energy systems dominated by inverter based variable generation
(Peer reviewed; Journal article, 2020)The demand for low carbon energy calls for close to 100% renewable power systems, with decarbonization of other energy sectors adding to the anticipated paradigm shift. Rising levels of variable inverter-based renewable ... -
System Impacts from Large Scale Wind Power
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:198, Doctoral thesis, 2013)The objective of the European Union to increase the share of renewable energy sources and Wind Power Production in particular, will be a severe challenge for the power system. Unscheduled production changes and remaining ... -
System integration of large scale offshore wind power
(Master thesis, 2011)Electricity generation, along with motor vehicles, is one of the biggest sources of pollution for the planet. Renewable energies are not able to replace massively polluting power plants but they can at least alleviate for ... -
A systematic review of machine learning techniques related to local energy communities
(Peer reviewed; Journal article, 2022)In recent years, digitalisation has rendered machine learning a key tool for improving processes in several sectors, as in the case of electrical power systems. Machine learning algorithms are data-driven models based on ... -
Systematikk for planlegging av mikronett - Eksempel på bruk ved reelt casestudie: Utsira Mikronett
(Master thesis, 2018)Ved å sammenfatte de viktigste faktorene ved et litteraturstudie og systematikk utviklet i forberedende prosjektoppgave har det blitt presentert en revidert utgave av systematikk vedrørende planlegging av mikronett. ... -
Tackling Variability in Renewable Energy Production and Electric Vehicle Consumption with Stochastic Optimization - The Benefits of Using the Stochastic Quasi-Gradient Method compared with Exact Methods and Machine Learning
(Master thesis, 2018)The work presented in thesis investigates different applications for implementing the Stochastic- Quasi Gradient (SQG) model to solve stochastic multistage AC-OPF problems, and com- pares it with a Stochastic-Dynamic ... -
Tangential AC Breakdown Strength of Solid-Solid Interfaces Considering Surface Roughness
(Chapter, 2017)The primary purpose of this paper is to study the influence of the surface roughness and interfacial pressure on the tangential AC breakdown strength (BDS) of solid-solid interfaces experimentally. Three-dimensional surface ... -
Tangential Electric Breakdown Strength and PD Inception Voltage of Solid-Solid Interface
(Doctoral theses at NTNU;2016:329, Doctoral thesis, 2016)The solid-solid interface is one of the critical region of the electrical insulation systems which consist of a combination of different insulating materials. It is predicted that the microscopic air-filled voids formed ... -
Tank Losses in a Generator Step-Up Transformer
(Master thesis, 2011)The background for the project is the 320 MVA generator step-up transformer for Jostedal Power Plant. The transformer experiences excess heating in a limited part of the steel tank and lid from eddy current loss caused by ...