• Apparatus for loss measurements under multidirectional and dc-bias flux in electrical steel laminations 

  Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2020)

  Conventional standardized power loss measurements for electric steels are performed at flux densities with a single sinusoidal and unidirectional excitation. However, the flux inside electrical steel laminations can deviate ...

• Internal pressures and pressure gradients in mass-impregnated HVDC cables during current cycling 

  Runde, Magne; Jonsson, Erik; Magnusson, Niklas; Solheim, Kristian Thinn (Peer reviewed; Journal article, 2020)

  The internal pressures in the insulation of two 5-m long pieces of a state-of-the art mass-impregnated non-draining subsea cable have been measured under load current cycling at ambient temperatures ranging from 3 to 37 ...

• Framework and methodology for active distribution grid planning in Norway 

  Sperstad, Iver Bakken; Solvang, Eivind; Gjerde, Oddbjørn (Chapter, 2020)

  The long-term planning frameworks currently used by electricity distribution grid companies are not designed to account for new challenges such as variable distributed generation or for new opportunities of active grid ...

• Potential of Thermal Energy Storage for a District Heating System Utilizing Industrial Waste Heat 

  Kauko, Hanne; Rohde, Daniel; Knudsen, Brage Rugstad; Sund-Olsen, Terje (Peer reviewed; Journal article, 2020)

  The potential for utilizing industrial waste heat for district heating is enormous. There is, however, often a temporal mismatch between the waste heat availability and the heating demand, and typically fossil-based peak ...

• Nonconvex Environmental Constraints in Hydropower Scheduling 

  Helseth, Arild; Mo, Birger; Hågenvik, Hans Olaf (Chapter, 2020)

  Environmental constraints in hydropower systems serve to ensure sustainable use of water resources. Through accurate treatment in hydropower scheduling, one seeks to respect such constraints in the planning phase while ...

• Load Compensation by DSTATCOM with LCL-Filter by Comparing Different Resonance Damping Methods 

  Kantar, Emre; Tedeschi, Elisabetta (Chapter, 2020)

• Data set for power system reliability analysis using a four-area test network 

  Sperstad, Iver Bakken; Solvang, Espen Hafstad; Jakobsen, Sigurd Hofsmo; Gjerde, Oddbjørn (Peer reviewed; Journal article, 2020)

  This article presents a test data set combining data relevant for power system reliability analysis, including network data, reliability data, basic interruption cost data, and exemplary operating state data. The data set ...

• Work Exchange Networks (WENs) and Work and Heat Exchange Networks (WHENs): A review of the current state of the art 

  Yu, Haoshui; Fu, Chao; Gundersen, Truls (Peer reviewed; Journal article, 2020)

  This paper provides a current state-of-the-art review of literature on work exchange networks (WENs) and work and heat exchange networks (WHENs). Heat exchange networks (HENs) and mass exchange networks (MENs) have been ...

• Dissecting the exergy balance of a hydrogen liquefier: Analysis of a scaled-up claude hydrogen liquefier with mixed refrigerant pre-cooling 

  Berstad, David Olsson; Skaugen, Geir; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)

  For liquid hydrogen (LH2) to become an energy carrier in energy commodity markets at scales comparable to for instance LNG, liquefier capacities must be scaled up several orders of magnitude. While state-of-the-art liquefiers ...

• Effects of scaling laws on the combustion and NOx characteristics of hydrogen burners 

  Meraner, Christoph; Li, Tian; Ditaranto, Mario; Løvås, Terese (Peer reviewed; Journal article, 2020)

  This paper proposes a novel bidirectional linkage between a long-term energy system model and an operational power market model. This combined modelling framework provides long-term energy system investment strategies that ...

• Non-linear charge-based battery storage optimization model with bi-variate cubic spline constraints 

  Aaslid, Per; Geth, Frederik; Korpås, Magnus; Belsnes, Michael Martin; Fosso, Olav B (Peer reviewed; Journal article, 2020)

  Variable renewable generation demands increasing amount of flexible resources to balance the electric power system, and batteries stand out as a promising alternative. Battery models for optimization typically represent ...

• Drag force for a burning particle 

  Zhang, Hancong; Luo, Kun; Haugen, Nils Erland L; Mao, Chaoli; Fan, Jianren (Peer reviewed; Journal article, 2020)

  Fully-resolved simulations of a burning char particle are performed to understand the effects of chemical reastions on the drag force by using the ghost cell immersed boundary method. The momentum, heat and mass transfers ...

• Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival? 

  Baktoft, Henrik; Gjelland, Karl Øystein; Szabo-Meszaros, Marcell; Silva, Ana T.; Riha, Milan; Økland, Finn; Alfredsen, Knut; Forseth, Torbjørn (Peer reviewed; Journal article, 2020)

  Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential ...

• Development and validation study of a 1D analytical model for the response of reheat flames to entropy waves 

  Gant, Francesco; Gruber, Andrea; Bothien, Mirko R. (Peer reviewed; Journal article, 2020)

  Numerical simulations of laminar premixed flames burning hydrogen and methane in spontaneous ignition mode are performed by harmonically exciting the reactants’ temperature at the domain inlet. The results are compared to ...

• Launch of the FarmConners Wind Farm Control benchmark for code comparison 

  Göcmen, Tuhfe; Kölle, Konstanze; Andersen, Søren Juhl; Eguinoa, Irene; Duc, Thomas; Campagnolo, Filippo; Iribas-Latour, Mikel; Astrain, David; Bottasso, Carlo; Meyers, Johan; van Wingerden, Jan Willem; Giebel, Gregor (Peer reviewed; Journal article, 2020)

  Careful validation of the modelling and control actions is of vital importance to build confidence in the value of coordinated wind farm control (WFC). The efficiency of flow models applied to WFC should be evaluated to ...

• Expert Elicitation on Wind Farm Control 

  van Wingerden, Jan Willem; Fleming, Paul A.; Göcmen, Tuhfe; Eguinoa, Irene; Doekemeijer, Bart; Dykes, Katherine; Lawson, Michael; Simely, Eric; King, Jennifer; Astrain, David; Iribas-Latour, Mikel; Bottasso, Carlo; Meyers, Johan; Raach, Steffen; Kölle, Konstanze; Giebel, Gregor (Peer reviewed; Journal article, 2020)

  Wind farm control is an active and growing field of research in which the control actions of individual turbines in a farm are coordinated, accounting for inter-turbine aerodynamic interaction, to improve the overall ...

• Assessment of Transient NOx Reduction Potential in Wood Stoves 

  Skreiberg, Øyvind; Li, Tian; Bugge, Mette; Haugen, Nils Erland L (Peer reviewed; Journal article, 2020)

• Stochastic Load Modeling of High-Power Electric Vehicle Charging - A Norwegian Case Study 

  Ivarsøy, Eirik; Torsæter, Bendik Nybakk; Korpås, Magnus (Chapter; Peer reviewed, 2020)

  In recent years, the number of electric vehicles (EVs) has increased rapidly. Due to technological advancement, government policies and the focus on reducing greenhouse gas emission, the growth can be expected to continue. ...

• Impact of seasonal weather on forecasting of power quality disturbances in distribution grids 

  Michałowska, Katarzyna; Hoffmann, Volker; Andresen, Christian Andre (Chapter; Peer reviewed, 2020)

  Power supply disruptions, including short-time disturbances, can lead to large direct and indirect financial losses. The ability to predict the risk of these disturbances allows for preventive actions and increases the ...

• Deep Reinforcement Learning for Long Term Hydropower Production Scheduling 

  Riemer-Sørensen, Signe; Rosenlund, Gjert Hovland (Chapter; Peer reviewed, 2020)

  We explore the use of deep reinforcement learning to provide strategies for long term scheduling of hydropower production. We consider a use-case where the aim is to optimise the yearly revenue given week-by-week inflows ...

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