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Experimental Investigation of Free Space Optical Channel Performance in the Arctic Weather
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-07)This paper investigates the technical aspects of the 1550 nm free space optical (FSO) link in extreme Arctic weather, specifically in falling snow, which is currently understudied. We measured the time variation of the received optical power in many snowfall events and derived attenuation statistics. Continuous measurements allowed us to estimate attenuation under varying temperatures and humidity ... -
Voltage Control In Smart Distribution Network With Limited Reactive Power Capacity Of Smart Inverter Using Machine Learning
(Master thesis; Mastergradsoppgave, 2023-05-20)It is very important for consumers to have the operating voltages within the specified limit. Sometimes, this is not possible to provide by the grid operators although grid operators invest heavily in voltage regulating devices. With the integration of variable renewable energy systems in the grid, it has become more challenging for the grid companies to regulate them to provide stable voltages and ... -
Performance optimization for hybrid TS/PS SWIPT UAV in cooperative NOMA IoT networks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-29)This study examines a cooperative non-orthogonal multiple access (NOMA) network utilizing an energy-constrained unmanned aerial vehicle (UAV) relay (UAVR) to expand coverage and improve network throughput. In order to provide energy to the UAVR, we consider the hybrid simultaneous wireless information and power transmission (SWIPT) method, which allows the UAVR to harvest energy from the source ... -
Teaching Linear Algebra to Engineering Students in Two Different Educational Settings: Design and Learning Outcomes
(Journal article; Tidsskriftartikkel, 2024-02-16)The present paper holds a twofold perspective on a new teaching format in a linear algebra course given to engineering students. The design resembles the flipped classroom, but with various adjustments. The first part highlights the basis on which the design was built, both research results and practical issues, but also the implementation of the teaching. It did not proceed quite as expected. The ... -
Flexibility and their role in capacity and congestion management
(Master thesis; Mastergradsoppgave, 2024-05-15)The energy market transition from a regulated power market to a deregulated power market ensures a more liberalized approach toward energy trade as it allows small and medium independent power trading entities to share the market. This provides a competitive environment in the energy market, and market forces also come into action to ensure the balance of the market. With all these advantages, ... -
Optimal attitude control and maneuver design for space debris detection in low earth orbit performed by a CubeSat
(Master thesis; Mastergradsoppgave, 2024-05-15)Space debris has become an important topic, and several national and international space agencies are currently studying space debris detection and removal to increase the safety of space missions. UiT the Arctic University of Norway in Narvik is aiming to develop a 2U CubeSat that can perform in-situ detection of debris with the projects UNICube and QBDebris. The mission target is to detect mm-sized ... -
Real-time application of grid-forming converters in smart distribution network
(Master thesis; Mastergradsoppgave, 2023-05-21)As the world faces the urgent need to reduce greenhouse gas emissions and combat climate change, renewable sources of energy have emerged as a viable solution. However, integrating renewable energy into existing power grids poses unique challenges. The availability of solar power depends on sunlight, wind power on wind speed, and this variability can cause instability and fluctuations in the grid, ... -
Robust visual inertial odometry for agile flight sensor fusion
(Master thesis; Mastergradsoppgave, 2024-07-05)This thesis presents the development and validation of a robust Visual-Inertial Odometry (VIO) system tailored for agile unmanned aerial vehicles (UAVs) operating in GPS-denied environments. These environments often challenge traditional navigation systems due to their inherent limitations in urban canyons, indoors, or densely forested areas. The study introduces a novel visual odometry (VO) algorithm ... -
Electric Load Forecasting of Residential Building
(Master thesis; Mastergradsoppgave, 2024-05-15)As global energy consumption continues to rise relevant energy sectors and communities must accurately forecast future electricity needs. This foresight is critical for effective planning, preserving the stability of the electricity grid, and avoiding blackouts. Accurate forecasting methodologies are critical in guiding decision-making processes correlated to resource allocation, infrastructure ... -
Virtual inertia to the AC Microgrid to improving the ROCOF and frequency Nadir in a Hybrid AC/DC Microgrid.
(Master thesis; Mastergradsoppgave, 2024-05-15)To move the global energy away from fossil fuels towards renewable energy leads toward a more complex grid, after experiencing a reduction of inertia when integrating large renewable energy sources (RES). With an increased pace of RES penetration into the grid and along a growing demand of electrical power, the challenge to maintain the system frequency as close as possible to the nominal range ... -
Solar Angle Optimizer
(Master thesis; Mastergradsoppgave, 2024-05-15)This thesis deals with the subject of a two axis rotatable solar panel rig where the design for the electrical components are proposed and the controller code from previous theses are further developed. The rig is to be used for research by UiT Narvik and the prerequisites for the installation of the rig are designed in this thesis. The electrical components for the rig proposed are an H-bridge, ... -
Electric snowmobile.
(Master thesis; Mastergradsoppgave, 2024-05-15)The main purpose of the project is to convert the snowmobile to electric and make it operational, which rule out focus on factors as ex. driving range, user interface for performance adjustment, heating for comfort, etc. For mounting the electric motor a suitable and feasible location and motor bracket to easy access the existing gearbox axel, and also in position to a cooling airflow through the ... -
Impact on Distribution Network Hosting Capacity using Machine Learning Based Reactive Power Support from PV Smart Inverters
(Master thesis; Mastergradsoppgave, 2024-05-15)Nowadays, due to growth of advanced technology and its impact on people lives, there is an increasing need for aligning and optimizing infrastructure with people needs. Harnessing renewable energy from different sources, store and eventually transmit and distributed it is an all-time challenge which nowadays by implementing and proper maintenance we lead to having higher efficiency to the point where ... -
Wide Area Control and Improvement of Dynamical State of Power System
(Master thesis; Mastergradsoppgave, 2024-05-15)Some approaches to achieving full observability and controllability in power systems are explored in this thesis. The core structure of this work consists of observability and controllability, focusing on two key phases of optimization and control. In the first phase, system observability is addressed through optimal placement of Phasor Measurement Units (PMUs). The Connectivity Matrix Algorithm ... -
Trajectory Tracking with Collision Avoidance for Large Vessel Draft Surveys
(Master thesis; Mastergradsoppgave, 2024-05-15)This thesis explores the innovative use of unmanned aerial vehicles to conduct draft surveys of large maritime vessels. This process is critical for determining vessel load through water displacement measurements. At the port of Narvik, a crew typically performs this task manually, where LKAB’s iron ore cargo vessels are surveyed while docked. The usual method requires going around the ship in ... -
DC-DC Converter For Fuel Cell (Control Strategy, Voltage Curve, Optimization, Converter Type). Current-fed Full-bridge Isolated DC-DC Converter With An Active Clamp Circuit For Fuel Cell Application
(Master thesis; Mastergradsoppgave, 2022-05-15)This thesis investigates one of the most favorable converters for integrating fuel cells into a DC microgrid. A current-fed full-bridge isolated DC-DC converter has advantages such as high voltage conversion ratio, low switches’ losses, and low input current ripple which make it one of the best choices for Fuel cells (FC). This converter transfer power to the load through the leakage inductance which ... -
Non-directional Overcurrent Protection Relay Testing Using Virtual Hardware-in-the-Loop Device
(Chapter; Bokkapittel, 2023-05-17)Protective relays are an integral part of the power grid, making it reliable and secure against abnormal conditions. Hardware-in-the-Loop (HIL) can be employed to test and validate digital protective relay devices in the real-time simulation comprising hardware and software before actual implementation. However, the HIL technique requires a complex and high-cost technical environment consisting of ... -
Take-Home Exams in University Mathematics and Science Subjects: Some Ethical Considerations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)This article addresses some challenging perspectives related to offering take-home exams in mathematics at university level. The challenges arose during work on a previous article where four perspectives originating from Bjerrum Nielsen’s framework (2003) were used to analyze universities’ assessment methods during the Covid lockdown in our country. The perspectives had some ethical considerations ... -
Stabilization of Non-Cooperative Satellites in Low Earth Orbits using Inter-Satellite Atmospheric Drag
(Chapter; Bokkapittel, 2023-08-07)This paper presents a novel solution to the problem of stabilization of non-cooperative satellites in low Earth orbits, which utilizes inter-satellite aerodynamic drag effects for generation of aerodynamics moments in the wake of a controlled satellite. Hence, by altering the position of a smaller controlled satellite, we are able to change the wake region and thus provide aerodynamic moments for ... -
Under Seawater Capacitive Power Transfer for Maritime Charging Applications
(Chapter; Bokkapittel, 2023-09-12)Underwater capacitive power transfer (CPT) can provide an inexpensive and light electric charging solution with good misalignment tolerance for unmanned maritime vehicles. This paper investigates the effect of the changing of the frequency and the distance on the power transfer and overall efficiency of the underwater CPT system, considering the dielectric losses of the medium. It also proposes and ...
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