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Coordinated Controller to Mitigate Voltage Violation in Smart Distribution Network
(Master thesis, 2025)This thesis addresses the increasing challenges posedby highphotovoltaic(PV) penetration in distribution networks, specifically focusing on voltage stability issues caused by extreme seasonal generation variations. Current voltage con- trol approaches fail to effectively manage these fluctuations- tests on the IEEE 37-bus system showed summer solar production is over 5 times higher than in winter. ... -
Landing a Multirotor on a Vessel at Sea
(Master thesis, 2025)Operating unmanned aircraft from vessels in the open ocean is demanding both on the personnel involved in the operation and on the aircraft. The work presented here aims to alleviate the workload on pilots and other personnel by introducing a higher level of automation in the landing phase of a flight. This will help create value for all parts of the supply chain, from product developers through ... -
Novel Guidance Schemes For GT Missions Master Thesis
(Master thesis, 2025)Ensuring the long-term stability of a gravity-tractor spacecraft near a binary asteroid demands guidance laws that can withstand the nonlinear, multi-body dynamics and uncertainties of space. We derive and compare three controllers the PD+, the LQR, and a High-Order Sliding-Mode Controller (HOSMC) with super-twisting, for both a two-body approximation and the full circular restricted three-body ... -
Quaternion-Based Backstepping Control of Relative Attitude in a Spacecraft Formation
(Journal article; Tidsskriftartikkel, 2006-12)In this paper we present a solution to the problem of controlling relative attitude in a leader-follower spacecraft formation, with focus on the rotation path for the follower spacecraft. Mathematical models of relative attitude kinematics and dynamics are presented, and a nonlinear control law designed by use of integrator backstepping is used to control the relative attitude in the formation. The ... -
A model of relative position and attitude in a leader-follower spacecraft formation
(Chapter; Bokkapittel, 2005)In this paper, a model of a leader-follower spacecraft formation in six degrees of freedom is derived and presented. The nonlinear model describes the relative translational and rotational motion of the spacecraft, and extends previous work by providing a more complete factorization, together with detailed information about the matrices in the model. In addition, mathematical models of orbital ... -
Addressing Cross-Coupling Issues in Magnetically Integrated Three-Port DC-DC Converters
(Conference object; Konferansebidrag, 2024-10-25)DC grid-forming converters are used to provide dc power distribution inside buildings. Often, such converters are based on dual-active bridge (DAB) technology to provide high-frequency isolation. Certain developing standards related to dc installations specify different isolation classes and protection zones. This is a critical requirement for power converter design, especially for building applications ... -
Single-Stage, Single-Phase Current Source Inverter for Standalone Applications
(Chapter; Bokkapittel, 2024-03-10)The current source inverters (CSI) are considered more reliable than their voltage source counterparts due to the inherent current-limiting feature. This is particularly interesting for many applications, such as battery energy storage, where there is a possibility of very high short-circuit currents. In addition, CSI can provide an inherent voltage boost capability, allowing integration of extra-low ... -
Vibration and Mobility Analysis of Hovering Rotary Wing UAV for Adaptive FSO Beam Alignment
(Chapter; Bokkapittel, 2024-11-28)Unmanned aerial vehicles (UAVs) are regarded as a potential platform for deploying airborne free space optical (FSO) fronthaul/backhaul links. The challenge emerges from the UAV hovering mobility which deteriorates beam alignment. To solve this challenge, we conducted two hover flights using a quadrotor UAV to measure vibration levels and hover fluctuations offering practical insights into the ... -
An Adaptive Modulation Technique for Power Quality Improvement in Standalone Single-Phase Current Source Inverters
(Chapter; Bokkapittel, 2024-07-15)The presence of low-frequency power oscillations on the DC link and overlap-time both degrade the output power quality of single-phase current source inverters. This paper proposes a novel modulation technique that simultaneously mitigates the effects of both low-frequency power oscillations and overlap-time. By simultaneously addressing these issues, the proposed adaptive modulation technique ... -
Home Energy Management System for a Residential Building in Arctic Climate of Norway Using Non-Intrusive Load Monitoring and Deep Learning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-06)Residential buildings can actively participate in energy management strategies by integrating advanced metering infrastructure to have a reliable and stable distribution system. This paper introduces a novel home energy management system (HEMS) framework to minimize total electricity costs by optimizing the charging of an electric vehicle (EV). The methodology incorporates a non-intrusive load ... -
Solenergi i Longyearbyen
(Master thesis; Mastergradsoppgave, 2020-02-01)Denne rapporten presenterer og drøfter implementering av større mengder solkraft i energisystemet i Longyearbyen. Solkraft er ikke det første man tenker på når man nevner Svalbard, men som absolutt viser seg å ha et potensial så langt nord. Mye på grunn av midnattssolen og kaldt klima. Det eksisterer allerede noen installasjoner av solkraft i og rundt Longyearbyen. Disse har blitt kartlagt og ... -
Fault Tolerant Flight Control for the Traction Phase of Pumping Airborne Wind Energy Systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-02)A fault-tolerant control approach is proposed, for a pumping airborne wind energy system (AWES) comprising a tethered fixed-wing aircraft with integrated propellers for vertical take-off and landing (VTOL). First, the flight control design for the traction phase of the system, when the tethered aircraft has to fly in loops using the rudder, is presented. Then, the presence of the propellers, that ... -
Large-Scale Reverse Pumping for Rigid-Wing Airborne Wind Energy Systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-25) -
The representation of hydrogen in open-source capacity expansion models
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-12-19)The intermittent nature of wind and solar power has led to a scientific consensus in the international energy research community that a mix of energy sources and carriers is necessary to achieve carbon neutrality. The search for alternatives has sparked renewed interest in Hydrogen (H2) and its derivatives, such as ammonia and methane. It has also motivated researchers to expand their models to study ... -
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 ...
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