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Online Voltage Stability Monitoring in Distribution Networks
(Master thesis, 2017)Power systems are often operated close to their stability limit. Line contingencies or other disturbances can cause the system to lose stability. If the power system loses stability counteractions have to be taken or else ... -
Onset of Convection in Two-Dimensional Porous Cavities with Open and Conducting Boundaries
(Journal article; Peer reviewed, 2021)The onset of thermal convection in two-dimensional porous cavities heated from below is studied theoretically. An open (constant-pressure) boundary is assumed, with zero perturbation temperature (thermally conducting). The ... -
Open Conductor Faults and Dynamic Analysis of a Power System
(Master thesis, 2012)The overall goal of this thesis is to study and understand Open Conductor Faults and to assess their impact on the stability of a power system. In particular, the thesis has investigated the effect of this type of the fault ... -
An Open Source Power System Simulator in Python for Efficient Prototyping of WAMPAC Applications
(Chapter, 2021)An open source software package for performing dynamic RMS simulation of small to medium-sized power systems is presented, written entirely in the Python programming language. The main objective is to facilitate fast ... -
Operating a Battery in a Hydropower-Dominated System to Balance Net Load Deviations
(Chapter, 2019)Decreasing costs of battery storage technologies make them a viable option for providing flexibility in power systems. In this paper, we study the operations of a battery in combination with cascaded hydropower in a system ... -
Operating cost reduction of DC microgrids under real-time pricing using adaptive differential evolution algorithm
(Peer reviewed; Journal article, 2020)Virtual resistance-based droop control is widely adopted as secondary-layer control for grid-connected converters in DC microgrids. This paper presents an alternative usage of the virtual resistances to minimize the total ... -
Operation and Control of hybrid AC/DC transmission grids
(Chapter, 2019)This paper describes challenges and possibilities related to operation and control of hybrid AC/DC power transmission grids. The aim is to discuss topics that transmission system operators and regulators must assess in ... -
Operation Features of a Reduced Matrix Converter for Offshore Wind Power
(Master thesis, 2011)When a wind park is sited offshore, compact, lightweight and reliable components are important requirements. In this Master's thesis a wind energy conversion system has been proposed, where the objective is to meet the ... -
Operation of IGBT-Modules in Insulation Liquids - A First Step for Enabling Operation in High Pressure Environments
(Master thesis, 2015)Theory regarding the main components needed in a subsea converter are provided. Focus is spent on the IGBT and pulse testing are described. A safe and fully functional test cell for high voltage single and double pulse ... -
Oportunities for hydrogen production in connection with wind power in weak grids
(Journal article; Peer reviewed, 2008)This paper gives an overview of the opportunities that exist for combining wind power and hydrogen (H2) production in weak grids. It is described how H2 storage can be applied in both isolated and grid-connected systems, ... -
Oppgradering av Vannkraftsimulator
(Bachelor thesis, 2020)Denne bacheloroppgaven har tatt for seg oppgradering av en eksisterende vannkraftsimulator med nytt maskinsett og distribusjonsnett. Vannkraftsimulatoren var opprinnelig bygget for 230 V IT nett på HIST men har blitt flyttet ... -
Oppgradering og optimalisering av synkrongenerator ved Lutufallet kraftverk
(Master thesis, 2021)Bakgrunnen til dette prosjektet kommer av en aldrende maskinpark i norske vannkraftverk og derav et økt behov for rehabilitering og oppgraderinger av synkrongeneratorer som er installert i kraftverkene. Årsaken som utløser ... -
Opportunities for Local Energy Supply in Norway: A Case Study of a University Campus Site
(Journal article; Peer reviewed, 2019)Neighbourhoods can contribute to climate change mitigation by supplying and/or facilitating renewable energy sources (RES). In this context, we evaluate opportunities related to the energy system of a Norwegian university ... -
Opportunity-cost-pricing of reserves for a simple hydropower system
(Journal article; Peer reviewed, 2016)This work investigates the cost of delivering different types of balancing reserves from a simple hydropower reservoir system. In addition to delivering energy, the fast ramping characteristics of hydropower units makes ... -
Opprettelse av stegvis aggregeringsheuristikk og aggregeringsmodeller for vannkraftsystemer
(Master thesis, 2017)Norge har i flere tiår benyttet seg av vannkraft som en energiressurs, og Samkjøringsmodellen har lenge blitt brukt for simulering av kraftpriser i det nordiske kraftmarkedet. Det store antall vannkraftverk og vannreservoarer ... -
Opprustning av Svorkmo kraftverk
(Master thesis, 2009)TrønderEnergi ønsker å undersøke om innsetting av et tredje aggregat i Svorkmo kraftverk vil gi økt produksjonsgevinst, bedret totalvirkningsgrad ved lave vannføringer og mer fleksibel drift av vassdraget. Svorkmo kraftverk ... -
Optical investigation on pre-strike arc characteristics in medium-voltage load break switches
(Journal article, 2021)Medium voltage load break switches (MV-LBS) should pass fault current while closing and be able to re-open for the next operation. Replacing SF6 as a high impact greenhouse insulating gas with air, makes the switch design ... -
Optimal and Adaptive Arming of System Protection Schemes
(Doctoral theses at NTNU;2023:437, Doctoral thesis, 2023)A dependable power supply is critical to the well-being of today’s society. According to forecasts, this issue will become increasingly relevant and pose numerous challenges that need to be faced. The energy demand is ... -
Optimal Bidding Strategy in the Reserve Capacity Market
(Master thesis, 2016)Good balancing services is a prerequisite for a well-functioning power market. Additionally to the day-Ahead market (DA) for electricity, there is a balancing market (BM) which provides the necessary buffers to handle short ... -
Optimal Compensation of Harmonic Propagation in a Multi-Bus Microgrid
(Journal article; Peer reviewed, 2016-05)This paper discusses how an Active Power Filter (APF) can be utilized for system-wide harmonic mitigation in a microgrid with multiple sources of harmonic distortion located at different buses. A two-bus microgrid system ...