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A Method to Estimate the Necessary Twist Pitch in Multi-filamentary Superconductors
(Journal article; Peer reviewed, 2014)Twisting of multi-filamentary superconductors is an important step in the development of wires with AC losses at an acceptable level for AC applications. The necessary twist pitch depends on wire architecture, critical ... -
A Model for Techno-Economic Optimization of Wind Power Combined with Hydrogen Production in Weak Grids
(Journal article; Peer reviewed, 2009)This paper presents a two-step method for dimensioning and time-sequential operation of Wind-hydrogen (H2) plants operating in power markets. Step 1 involves identification of grid constraints and marginal power losses ... -
A Modular Series Connected Converter for a 10 MW, 36 kV, Transformer-Less Offshore Wind Power Generator Drive
(Journal article; Peer reviewed, 2012)In the future, large offshore wind turbines are expected to reach a rating of 10 MW. To reduce the corresponding weight increase of the nacelle, research has started to focus on solutions to omit the step-up transformer ... -
A Modular Single Active Bridge Converter to Supply Low Voltage Loads from MVDC Grids
(Master thesis, 2024)AC har vært den tradisjonelle løsningen for bygging av kraftsystemer, men framtidig nettutvikling krever nye løsninger. DC-nett gir fordeler i effektivitet, kompatibilitet med moderne elektronikk, applikasjoner med fornybar ... -
A novel arrangement for improving three phase saturated-core fault current limiter (SCFCL)
(Chapter, 2018)Fault current limiter (FCL) is a device that has low impedance in normal state of the power network and has simultaneous large impedance in the time of fault, so that it would lead to limitation of the fault current. Among ... -
A Novel Methodology to Monitor Partial Discharges in Microvoids at Solid-Solid Interfaces
(Chapter; Peer reviewed, 2019)The combination of two solid dielectrics increases the risk of partial discharge (PD) activity in microscopic cavities at the solid-solid dielectric interfaces, facilitating interface tracking failures. The main purpose ... -
A Practical Application of an Active Distribution Grid Planning Framework in Relation to a Pilot Area for New Energy Solutions
(Master thesis, 2021)Oppgaven er relatert til utbyggingen av et område i Bodø, kalt Molobyen, og er tilknyttet FME CINELDIs pilotprosjekt «Development area Molobyen». Målet med oppgaven har vært å undersøke ulike måter å koble Molobyen til ... -
A Probabilistic Model-aided Failure Prediction Approach for Spring-Type Operating Mechanism of High Voltage Circuit Breakers
(Journal article; Peer reviewed, 2018)To avoid failures in circuit breakers (CBs) and to extend the lifetime of these critical components, condition-based-maintenance has been increasingly requested by utilities to enable them to efficiently manage their assets. ... -
A real-time energy management system for smart grid integrated photovoltaic generation with battery storage
(Journal article; Peer reviewed, 2019)This paper proposes a real-time energy management system (EMS) suitable for rooftop PV installations with battery storage. The EMS is connected to a smart grid where the price signals indirectly control the power output ... -
A Robust Predictive MPPT Strategy: An Enabler for Improving the Photovoltaic Conversion Source
(Chapter, 2017)The key drivers for Maximum Power Point Tracking (MPPT) solutions in photovoltaic (PV) power plants are independency from solar panels, fast tracking of irradiance and temperature variations, and efficiency of conversion ... -
A Scheme for Creating an Small-Signal On-line Dynamic Security Assessment Tool - Using PSS/E and PacDyn
(Master thesis, 2016)The trend in today's electrical power system is that consumption and power peaks are increasing, which will push the grid to its limits. The large deployment of new renewable energy connected to the grid has also shifted ... -
A Selective Harmonic Compensation and Power Control Approach Exploiting Distributed Electronic Converters in Microgrids
(Journal article; Peer reviewed, 2019)This paper proposes an approach to obtain harmonic compensation and power control by exploiting the electronic power converters deployed in low-voltage microgrids. By the proposed approach, distributed harmonic current ... -
A Shorterm assessment of flexibility analyzing different levels of VRES deployment in a Unit Commitment model
(Master thesis, 2019)Flexibility has become an important property of the electric power systems and currently plays a crucial role in delivering efficient balancing to supply-demand operations. The rise of an environmental concern from governments ... -
A signal analysis toolbox for power system identification in Smart Grids
(Master thesis, 2018)This thesis delves into the two fields of signal analysis and small-signal stability of power systems. Due to the extensive deployment of PMUs in today s Smart Grid, new possibilities arise to assess the small-signal ... -
A Simple Procedure to Evaluate the Efficiency and Power Density of Power Conversion Topologies for Offshore Wind Turbines
(Journal article; Peer reviewed, 2012)The prospective development of the offshore wind energy conversion system is mainly promoted by demand for higher efficiency and power density. This paper describes a simple procedure to calculate the efficiency and power ... -
A Slim Wind Turbine Concept with Low Frequency AC Connection
(Master thesis, 2016)This thesis aims to investigate the feasibility of using a slim wind turbine concept together with a low frequency alternating current (LFAC) transmission system in an offshore wind farm system. By a slim wind turbine ... -
A Solution for Low Voltage Ride Through of Induction Generators in Wind Farms using Magnetic Energy Recovery Switch
(Master thesis, 2009)Induction generators constitute 30 percent of today’s installed wind power. They are very sensitive to grid voltage disturbances and need retrofitting to enhance their low voltage ride through (LVRT) capability. LVRT of ... -
A Stochastic mixed integer linear programming formulation for the balancing energy activation problem under uncertainty
(Chapter, 2017)In the activation market, the Transmission System Operator selects and activates balancing energy bids to cover the system imbalance. Growing use of intermittent energy sources increases uncertainty in system operation and ... -
A stochastic model for contact surfaces at polymer interfaces subjected to an electrical field
(Journal article; Peer reviewed, 2018)Morphology of the contact area between solid insulation materials ultimately determines the short- and long-term electrical properties of the complete insulation system. The main purpose of this paper is to propose a ... -
A stochastic optimization approach for pricing hydropower regulation capacity in electricity markets
(Master thesis, 2014)With the introduction of an increasing number of regulation markets,hydropower producers face multiple opportunities regarding how toutilize their water optimally. Such regulation markets can increaseprofits drastically ...