Recent additions

  • Evaluation of cascaded MPC performance in voltage source converters 

    Mokrushev, Ivan (Master thesis; Mastergradsoppgave, 2018-08-21)
    Model predictive control method becomes more popular in research over the last decade. Due to the growing popularity of the model predictive control concept, there are more and more questions about the effectiveness of this method in comparison with other methods. In this thesis cascaded model predictive control of grid connected voltage source converter with LCL filter has been evaluated. The ...
  • Transient analysis of road tunnel power system 

    Ivanova, Elizaveta (Master thesis; Mastergradsoppgave, 2018-08-16)
    The main tasks of Statens Vegvesen is to plan, build and maintain the roads of Norway. Tunnels are included as a part of this task. Due to expected changes in usage patterns and needs, the Norwegian authorities decided to adapt to the European model the design of low voltage networks. The backup power system is one of the most important parts of the installation and presents an independent source ...
  • Charging technology for small maritime vessels 

    Hoff, Bjarte (Conference object, 2019-01-21)
  • Engineering students' instrumental approaches to mathematics; some positive characteristics 

    Rensaa, Ragnhild Johanne (Journal article; Peer reviewed, 2018)
    The present paper presents three deliberately chosen mathematical episodes observed in a class of engineering students taking a basic calculus course. By drawing on analyses of instrumental and relational learning strategies, the episodes are shown to illustrate instrumental approaches indicated by the students. The paper discusses positive characteristics about these approaches while further data ...
  • Framework for Modeling and Simulation of Household Appliances 

    Bjerknes Nilsen, Christian; Hoff, Bjarte; Østrem, Trond (Peer reviewed; Chapter, 2018-12-31)
    This paper describes a framework for simulating household appliances in Simulink. Typical Norwegian household equipment have been analyzed based on their characteristic behavior, to establish the requirement for synthesizing and recreating their current waveform, harmonic currents and phase shift. Both detailed simulation of the current waveform and RMS currents for simulation over longer time periods ...
  • Modeling and Attitude Control of Satellites in Elliptical Orbits 

    Oland, Espen (Peer reviewed; Chapter, 2018-11-05)
    The attitude determination and control system (ADCS) for spacecraft is responsible for determining its orientation using sensor measurements and then applying actuation forces to change the orientation. This chapter details the different components required for a complete attitude determination and control system for satellites moving in elliptical orbits. Specifically, the chapter details the orbital ...
  • A Comparative Study of Different Control Structures for Flight Control with New Results 

    Oland, Espen; Kristiansen, Raymond; Gravdahl, Jan Tommy (Peer reviewed; Book; Chapter, 2018-10-24)
    This paper presents several different control structures that facilitate flight control and does a comparison between them. Specifically, this paper considers command-filtered backstepping, nonlinear dynamic inversion (NDI), and a new decoupled approach that decouples the rotational and translational dynamics by estimating the higher order derivatives of the angle of attack and sideslip angle. The ...
  • Quaternion Path-Following in Three Dimensions for a Fixed-Wing UAV Using Quaternion Blending 

    Andersen, Tom Stian; Kristiansen, Raymond (Peer reviewed; Book; Chapter, 2018-10-29)
    This paper presents a three dimensional guidance strategy for fixed-wing UAVs using quaternions. The algorithm is based on constructing two quaternions, one which makes the UAV fly towards the path and one that makes the UAV follow the path. These two quaternions are then blended together such that the path-following objective is reached. The guidance algorithm is applied to a simple kinematic model ...
  • A Reliable Modular Based PV-Battery Hybrid System with Peak Shaving Capability 

    Sohail, Umer; Nademi, Hamed; Norum, Lars Einar (Peer reviewed; Chapter, 2018)
    The driving factors in emerging photovoltaic (PV) systems and battery-energy-storage systems (BESS) are highly scalable feature, modular and flexible structures with superior transformerless performance. The feasibility of Modular Multilevel Converter (MMC) to operate without overall DC-link allows the integration of PV generators and battery strings with its submodules (SMs), whereas each SM acts ...
  • Cascaded Model Predictive Control of Grid Connected Converter with LCL Filter 

    Hoff, Bjarte (Peer reviewed; Book; Chapter, 2018-12-31)
    This paper presents a control strategy for grid connected voltage source converters with LCL filter, based on a cascade of two model predictive controllers (MPC). Despite the attention MPC has received in the research community over the last years, there are still raised question about what advantages such control methods can offer, compared to existing established control strategies. The cascaded ...
  • Framework for Modeling and Simulation of Household Appliances 

    Bjerknes Nilsen, Christian; Hoff, Bjarte; Østrem, Trond (Peer reviewed; Book; Chapter, 2018-12-31)
    This paper describes a framework for simulating household appliances in Simulink. Typical Norwegian household equipment have been analyzed based on their characteristic behavior, to establish the requirement for synthesizing and recreating their current waveform, harmonic currents and phase shift. Both detailed simulation of the current waveform and RMS currents for simulation over longer time periods ...
  • Curvature Continuous Path Generation for UAVs based on Generalized Expo-Rational B-Splines 

    Andersen, Tom Stian; Bouzidi, Ghada; Kristiansen, Raymond (Peer reviewed; Book; Chapter, 2018)
    This paper proposes a new path-planning algorithm based on GERBS to generate curvature continuous paths. The algorithm blends between a set of local curves generating a global smooth path which also interpolates the midpoint of the curves. Numerical examples are provided which demonstrates the potential of the proposed algorithm.
  • Dual-quaternion backstepping control for a fully-actuated rigid-body 

    Andersen, Tom Stian; Johansen, Tor-Aleksander; Kristiansen, Raymond (Peer reviewed; Book; Chapter, 2018-08-16)
    In this paper dual-quaternions are used to model a fully actuated rigid-body. A backstepping-controller that solves the trajectory tracking problem is derived and proved to provide uniform asymptotical stabilization of the error dynamics. Numerical simulations are provided where the controller is compared to existing dual-quaternion tracking controllers and it is shown to have similar performance.
  • Exploring Tensions in a Mathematical Course for Engineers utilizing a Flipped Classroom Approach 

    Fredriksen, Helge; Hadjerrouit, Said; Monaghan, John David; Rensaa, Ragnhild Johanne (Book; Chapter; Bok; Bokkapittel; Peer reviewed, 2017-02)
    Flipped Classroom approaches to teaching are becoming increasingly popular in higher education, but there is a lack of empirical research. We present here a study performed during an engineering course for 20 students at a Norwegian university, on student appropriation towards Flipped Classroom through interviews, questionnaire, video/quiz usage statistics and classroom filming. We approach this ...
  • Approaches to learning of linear algebra among engineering students 

    Rensaa, Ragnhild Johanne (Peer reviewed; Bok; Book; Bokkapittel; Chapter, 2017-02)
    The present paper investigates engineering students` own descriptions of what they mean by learning of linear algebra and how they know that they have learned something. I seek to extract keywords from engineering students` descriptions of learning of this discipline by drawing on grounded theory techniques and classifying the answers in conceptual and procedural approaches. By this, both detailed ...
  • Digitalization of the power business: How to make this work? 

    Svendsen, Arne Brufladt; Tollefsen, Trond; Gjengedal, Terje; Goodwin, Morten; Antonsen, Stian (Peer reviewed; Book; Bok; Bokkapittel; Chapter, 2018)
    As a result of the digitalization of the power business in Norway and Europa, a lot of new possibilities and challenges arise. In 2014 an expert committee one outlined a proposal for the future grid company structure in Norway (Reiten, 2014). In addition, new technologies are being implemented in the system. Wind power, solar power, un-regulated small hydro power production, battery storage domestic ...
  • Optical water types of the Nordic Seas and adjacent areas 

    Aas, Eyvind; Højerslev, Niels Kristian; Høkedal, Jo; Sørensen, Kai (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-05-20)
    A new map of Jerlov's optical water types in the Nordic Seas and adjacent waters at 139 locations, as well as a table with statistical and geographical properties of the vertical attenuation coefficient of downward irradiance at 475 nm, are presented. The data analysis is based on 715 recordings at different stations, at latitudes between 54° and 82°N, and longitudes between 31°W and 49°E, obtained ...
  • Når blir skipsfarten grønn? 

    Hoff, Bjarte; Østrem, Trond (Kronikk; Chronicle, 2018-04-25)
    n av utfordringene i forbindelse med dagens skipsfart er utslipp til luft, hovedsakelig karbondioksid og nitrogenoksider. Disse utslippene er knyttet til oljefyrte forbrenningsmotorer som dominerer dagens skipsflåte. Det er overveiende sannsynlig at det er en direkte sammenheng mellom global oppvarming og utslipp av klimagasser. Utslipp til luft kan også bidra til sur nedbør og svevestøv, for å nevne ...
  • Reliable parameter identification for synchronous machines 

    Alves, Erick Fernando (Master thesis; Mastergradsoppgave, 2018-08-16)
    This work investigates and implements algorithms for reliable parameter identification for salient pole synchronous machines that can be used for condition monitoring, on line assessment of the power grid, and adaptive control. All these applications are steps necessary to enable a smarter power grid, in which seamless integrated digital technology provides state estimation, fault detection, and ...
  • Large-scale Wind Power Integration in Northern Norway 

    Singh, Arwinder (Master thesis; Mastergradsoppgave, 2018-08-16)
    Norway has very high flexibility in energy production since hydropower covers about 95% of yearly energy demand. It is best to have a combination of wind and hydropower and hence it applies perfectly here in Norway. The performance of the wind farm can be significantly enhanced by employing full-capacity converters. The state-of-the-art literature study has been done on Squirrel Cage Induction ...

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