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Viser treff 1021-1040 av 1632
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Non-linear charge-based battery storage optimization model with bi-variate cubic spline constraints
(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 ... -
Applications of Big Data and Data Science in the Electricity Distribution Grid - State-of-the-art
(SINTEF Rapport;, Research report, 2020)Almost every household in Norway has a smart electricity meter installed. The advanced functionality of the meters and the large amounts of data transmitted from them have the potential to contribute to more than just a ... -
Experimental investigation of dry ice cyclone separator for ultra‐low temperature energy storage using carbon dioxide
(Peer reviewed; Journal article, 2020)CO2 cascade heat pump system has been developed to realize an ultra‐low temperature below the triple point of 0.518 MPa and − 56.6°C or less by flowing dry ice solid‐gas state of CO2 in a refrigeration system. Solid CO2 ... -
Household customers' assessment to capacity based distribution grid tariff
(International Conference on the European Energy Market;2020, Chapter; Peer reviewed, 2020)This paper presents the status of regulation related to distribution grid tariffs in Norway, and household customers’ assessment of having such a tariff scheme. The paper is presenting results from a Norwegian pilot where ... -
Pressure-Dependent Propagation of Streamers under Step Voltage in a long Point-Plane Gap in Transformer Oil
(Peer reviewed; Journal article, 2020)The effect of pressure on positive and negative streamer propagation in a mineral transformer oil is studied in an 80 mm point-plane gap under step voltage. Increased pressure causes reduced stopping length for non-breakdown ... -
Thermal interruption performance of ultrahigh-pressure free-burning nitrogen arc
(Lecture Notes in Electrical Engineering;599, Chapter; Peer reviewed, 2020)In this paper, an experimental investigation of the thermal interruption performance of free-burning nitrogen arcs at 1 bar, 20 bar, and 40 bar filling pressures is reported. This work contributes to the fundamental ... -
Deep Reinforcement Learning for Long Term Hydropower Production Scheduling
(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 ... -
Dominant Modes Identification of Linear Systems via Geometrical Search
(Peer reviewed; Journal article, 2020)This paper presents a novel approach, based on the theory of hyperplanes, for mode identification of linear systems. The proposed approach can operate on either a set of ordinary differential equations (converted to diagonal ... -
Evaluation of Inertia Emulation Strategies for DC- Voltage-Controlled and Power-Controlled Converter Stations in HVDC Interconnections
(Chapter; Peer reviewed, 2020)This paper presents an evaluation of two control schemes for virtual inertia support from the converter terminals of an HVDC interconnection. A point-to-point interconnection between asynchronous power systems is assumed, ... -
Expert Elicitation on Wind Farm Control
(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 ... -
Potential of Thermal Energy Storage for a District Heating System Utilizing Industrial Waste Heat
(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 ... -
Characterization of Residues from Entrained Flow Gasification of Wood
(Peer reviewed; Journal article, 2020) -
System impact studies for near 100% renewable energy systems dominated by inverter based variable generation
(Peer reviewed; Journal article, 2020)The demand for low carbon energy calls for close to 100% renewable power systems, with decarbonization of other energy sectors adding to the anticipated paradigm shift. Rising levels of variable inverter-based renewable ... -
Locating Generators Causing Forced Oscillations Based on System Identification Techniques
(Chapter; Peer reviewed, 2020)This paper presents a method to locate the source of forced oscillations in power grids caused by maloperation of turbine-governor systems. The transfer function between the grid frequency and the output active power is ... -
Impact of seasonal weather on forecasting of power quality disturbances in distribution grids
(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 ... -
Fisketrapp i Hoelsfoss i Valldøla - Forslag til tiltak for forbedret fiskevandring
(SINTEF Rapport;, Research report, 2020)I denne beskrivelsen av trappa i Hoelsfossen i Valldøla er det beskrevet at oppvandrende fisk kan hindres eller forsinkes forbi til turbinen.. Skjønnsmessig ser det ut til at fisken vil finne en vei forbi dette punktet, ... -
The impact of flexible resources in distribution systems on the security of electricity supply: A literature review
(Peer reviewed; Journal article, 2020)The power system is transitioning from the traditional one-way system to a more integrated and complex system with more active end-users and with generation and reverse power flow at the distribution level. As a part of ... -
Combining Machine Learning and Optimization for Efficient Price Forecasting
(International Conference on the European Energy Market;2020, Chapter; Peer reviewed, 2020)We present a framework based on machine learning for reducing the problem size of a short-term hydrothermal scheduling optimization model applied for price forecasting. The general idea is to reduce the optimization problem ... -
Modeling and Analysis of SOGI-PLL/FLL-based Synchronization Units: Stability Impacts of Different Frequency-feedback Paths
(Peer reviewed; Journal article, 2020)— Second-order Generalized Integrator (SOGI)-based quadrature-signal-generator (QSG) together with either a phaselocked-loop (PLL) or a frequency-locked-loop (FLL) constitute two types of typical synchronization units ... -
Evaluating Cost Trade-Offs between Hydropower and Fish Passage Mitigation
(Peer reviewed; Journal article, 2020)To promote the sustainable management of hydropower, decision makers require information about cost trade-offs between the restoration of fish passage and hydropower production. We provide a systematic overview of the ...