Institutt for elektroteknologi: Recent submissions
Now showing items 81-100 of 202
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Automated multi-rotor draft survey of large vessels
(Master thesis; Mastergradsoppgave, 2022-05-16)In maritime sector draft survey has a significant importance as it is used to determine many important factors used in maritime transportation. Draft is the vertical displacement from the bottom of the keel (the bottom-most element of a vessel) to the water line (the line of meeting point of hull and the water surface). It is used to measure the minimum water depth for safe navigation of vessel and ... -
Modeling and analysis of power system oscillations using real-time simulator.
(Master thesis; Mastergradsoppgave, 2022-05-16)In this thesis a version of the Kundur two-area model has been developed for Simulink and real time simulator software and hardware from OPAL-RT. This model should be used for testing the rotor angle oscillations load variations create. A review of the different control elements found in basic power systems has been reviewed and implemented. The main component that will be manipulated in the model ... -
Automated Tugboat Assisted Docking of Large Vessels
(Master thesis; Mastergradsoppgave, 2022-05-15)The main research aspect behind this project was the problem in docking the ship to the port with limited space and resources available, causing number of onsite accidents and loss of resources. The main objective is to increase safety on ports, reduce pollution and increase fuel efficiency, also reduce the docking time for the vessels, which can be achieved by developing an autonomous docking system ... -
Temporary Load Shedding - Optimization of power distribution system using load shedding Techniques
(Master thesis; Mastergradsoppgave, 2022-05-15)In today’s world, electrical energy is a necessity. The dependency on electricity is increasing day by day which caused the system to work under a stress state close to stability limits and disturbances. An efficient power system supplying electrical energy must be reliable, stable, secure, and reasonable to meet consumer needs. The power demand depends on several factors and weather is one of the ... -
Technical Challenges and Solutions of a three-phase bidirectional two stage Electric Vehicle charger
(Master thesis; Mastergradsoppgave, 2022-05-15)The sustainability of the power grid owing to the building strain of the ever-growing demand for electrical energy urges innovative and more practical solutions that enable active participation of end-users in stable and reliable management of power systems. One of the emerging projections of such a two-way exchange of electrical power between the grid and consumers is the developing field of ... -
Coordinated Volt-Var control in multiple smart inverters in Smart Distribution Networks for Voltage Regulation.
(Master thesis; Mastergradsoppgave, 2022-05-15)The inevitable growing demand for electrical power, depleting sources of conventional power generation, and world wide concern about global warming are major factors to boost the trend of renewable integration in grids. This rising trend is causing many technical and operational challenges where one of the most prominent problem is the overvoltage caused by distributed generation units, interfaced ... -
Comparative Analysis of a Current-Source and a Voltage-Source Converter for Three-Phase Grid-Connected Battery Energy Storage System
(Master thesis; Mastergradsoppgave, 2021-12-03). -
Control of Spacecraft Formation with Disturbance Rejection and Exponential Gains
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)We address the problem of state feedback translational motion control of a spacecraft formation through a modified sliding surface controller using variable gains and I^2 action for disturbance rejection. The exponential varying gains ensure faster convergence of the state trajectories during attitude maneuver while keeping the gains small (and the system less stiff) for station keeping. Integral ... -
All electric battery service vessel - Dynamic modeling of a battery fed IPMSM propulsion plant as a tool for energy estimates and functional description for an energy management system
(Master thesis; Mastergradsoppgave, 2017-06-12)"Designing an all-electric battery vessel, knowledge of the dynamic performance of the electrical propulsion plant becomes crucial to produce adequate estimates of needed battery capacity. An energy management system is to control the on-board power flow and ensure energy efficient operation of the vessel. This thesis presents a solution for dynamic simulation of an all-electric battery vessel based ... -
Ingeniørstudenters bruk av læringsverktøy i et lineær algebraemne : hvilken rolle spiller nettbaserte forelesninger?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-11)I denne artikkelen diskuteres studentenes bruk av læringsverktøy med spesielt fokus på et nettbasert tilbud. Egne forelesninger i et emne i lineær algebra for master ingeniørstudenter, fjerde år, har blitt streamet og publisert, og jeg har undersøkt hvordan studentene har brukt disse forelesningene. Data er innsamlet første og tredje gang dette ble gjort, og hovedvekten i denne artikkelen er lagt ... -
A note about frequencies being close or amplitudes being small in frequency analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-10)In an earlier paper, an alternative method for how to solve the frequency analysis problem was offered. The object of the present paper is to bring about how to handle situations where the frequencies are close to each other or there is an amplitude that is really small. -
En tematisk analyse av hva ingeniørstudenter gjør når de lærer lineær algebra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-15)Denne artikkelen diskuterer hva ingeniørstudenter gjør når de lærer lineær algebra. Arbeidet inngår i et pågående forskningsprosjekt om læring, og grunnlagsdataene for artikkelen ble samlet inn ved at studentene besvarte et obligatorisk spørreskjema der spørsmålet om hva de gjør når de lærer lineær algebra, ble stilt som et åpent spørsmål. Dataene representerer derfor studentenes egne ord om hva de ... -
A computational intelligence-based maximum power point tracking for photovoltaic power generation system with small‐signal analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-01)There are multiple peak functions in its output power characteristic curve of a photovoltaic (PV) array under partial shading conditions (PSCs), the perturb and observe (P&O) may fail to track the global maximum power point (GMPP). Therefore, a reliable maximum power point tracking (MPPT) technique is essential to track the GMPP within an appropriate time. This article proposes a hybrid technique ... -
Bio‐inspired hybrid BFOA‐PSO algorithm‐based reactive power controller in a standalone wind‐diesel power system
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-05)With an increase in the penetration of renewable energy sources such as wind into the power systems, the operation and control of voltage/reactive power have become more complicated and challenging than ever. As a result, the reactive power imbalance between reactive power generation and demand instigates a reduction in system voltage stability. To deal with the aforesaid scenarios, automatic voltage ... -
PSO and Kalman Filter-Based Node Motion Prediction for Data Collection from Ocean Wireless Sensors Network with UAV
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-13)In this paper, we consider a wireless sensor network of nodes at the sea surface drifting due to wind and sea currents. In our scenario an Unmanned Aerial Vehicle (UAV) will be used to gather data from the sensor nodes. The goal is to find a flyable path which is optimal in terms of sensor node energy consumption, total channel throughput between the UAV and sensor nodes, flight time for the UAV and ... -
Optimal Solutions for Underwater Capacitive Power Transfer
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-09)Capacitive power transfer (CPT) has attracted attention for on-road electric vehicles, autonomous underwater vehicles, and electric ships charging applications. High power transfer capability and high efficiency are the main requirements of a CPT system. This paper proposes three possible solutions to achieve maximum efficiency, maximum power, or conjugate-matching. Each solution expresses the ... -
Keeping track of samples in multidisciplinary fieldwork
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-10)We here present methods, tools and results for efficiently collecting metadata and tracking samples collected in the field. The samples and metadata were collected during scientific cruises conducted by amongst others marine biologists, oceanographers, geochemists and marine geologists in the Nansen Legacy project. It is here reported on the successful development and implementation of a system ... -
Modified demagnetisation control strategy for low-voltage ride-through enhancement in DFIG-based wind systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-16)The large-scale wind energy conversion systems (WECSs) based on doubly-fed induction generators (DFIGs) are very popular in recent years due to the numerous technical and economic benefits. With the increasing penetration level of wind energy, the latest grid codes require the DFIG-based WECSs to remain connected to the grid under grid fault scenarios and deliver the required reactive power into ... -
Optimal Volt Var control in Smart Distribution Networks
(Master thesis; Mastergradsoppgave, 2021-05-24)Both the generation and transmission power networks are facing new threats and opportunities as the number of distributed energy resources (DERs) grows. Because of the high solar PV penetration, voltage rise and voltage volatility are becoming major problems in the distribution network. Voltage regulating devices (VRDs), such as on load tap changers (OLTCs), phase voltage regulators (SVRs), and ... -
Designing an Autonomous Racing Drone
(Master thesis; Mastergradsoppgave, 2021-05-19)In recent years drone racing using human pilots have increased in popularity. This combined with the increased usage of autonomous driving vehicles have sparked a new field of interest which is Autonomous Racing Drones competitions. This thesis explores the field of drone design and avionics with the conclusion of presenting the first Racing Drone prototype that can be used in future work made by ...