Browsing Institutt for elkraftteknikk by Document Types "Journal article"
Now showing items 61-80 of 541
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Breakdown Voltage of Polymeric HVDC Insulation at DC Stress and Superimposed Lightning Impulse Voltages
(Peer reviewed; Journal article, 2022)Space charge formation makes it difficult to predict the resulting electric field distribution within HVDC cable insulation. The main purpose of the work presented here has been to experimentally study how the lightning ... -
Bundled Generation and Transmission Planning Under Demand and Wind Generation Uncertainty Based on a Combination of Robust and Stochastic Optimization
(Journal article; Peer reviewed, 2018)Bundled generation and transmission expansion planning (BGTEP) aims to solve problems related to ascendant demand of power systems. A BGTEP model is considered in this paper and the optimal planning for a long-term period ... -
Capacity subscription grid tariff efficiency and the impact of uncertainty on the subscribed level
(Peer reviewed; Journal article, 2022)While volume-based grid tariffs have been the norm for residential consumers, capacity-based tariffs will become more relevant with the increasing electrification of society. A further development is capacity subscription, ... -
Carbon abatement costs for renewable fuels in hard-to-abate transport sectors
(Peer reviewed; Journal article, 2023)Renewable fuels can help to reduce carbon emissions from transportation. To inform planning decisions, this paper estimates carbon abatement costs of replacing fossil fuels with renewable hydrogen, ammonia, or Fischer–Tropsch ... -
Case Study of Integrating an Offshore Wind Farm with Offshore Oil and Gas Platforms and with an Onshore Electrical Grid
(Journal article; Peer reviewed, 2013)This research project explored the technical feasibility of utilizing an offshore wind farm as a supplementary power source to several electrical grids of offshore oil and gas platforms and providing surplus power to an ... -
Centralised and Distributed Optimization for Aggregated Flexibility Services Provision
(Peer reviewed; Journal article, 2020)The recent deployment of distributed battery units in prosumer premises offer new opportunities for providing aggregated flexibility services to both distribution system operators and balance responsible parties. The ... -
Challenges and Rationale for Laboratory Research of Offshore Grids
(Journal article; Peer reviewed, 2012)Offshore power systems will be characterized by a large penetration of power electronics converters and power cables, resulting in complex behaviors that can be quite different from traditional AC systems. Analyzing such ... -
Challenges in all-dc offshore wind power plants
(Peer reviewed; Journal article, 2021)As the size and distance from shore of new offshore wind power plants (OWPPs) increase, connection to shore using high-voltage (HV) direct-current (DC) technology becomes more cost-effective. Currently, every offshore wind ... -
Challenges in platforming and digitizing decentralized energy services
(Journal article; Peer reviewed, 2022) -
Challenges on drive circuit design for series-connected SiC power transistors
(Journal article; Peer reviewed, 2017)The breakdown voltages of the currently available 1.2 and 1.7-kV classes Silicon Carbide (SiC) transistors are not sufficient to operate under medium blocking voltages. On the other hand, the fabrication yields of the ... -
Characterization of Ultrahigh Pressure Nitrogen Arc Using Black Box Arc Model
(Journal article; Peer reviewed, 2023)In this paper, the effect of filling pressure on the black box arc parameters of nitrogen arc is reported using Mayr arc model. The arc current is approximately 130 A at 190 Hz. The filling pressure is varied at absolute ... -
Characterizing flexibility in power markets and systems
(Peer reviewed; Journal article, 2022)The increasing share of variable renewable energy sources creates a need for flexibility resources in the power system operations. This paper presents suggestions for characterizing flexibility, including dimensions of ... -
Characterizing the energy flexibility of buildings and districts
(Journal article; Peer reviewed, 2018)The large penetration rate of renewable energy sources leads to challenges in planning and controlling the energy production, transmission, and distribution in power systems. A potential solution is found in a paradigm ... -
Closest security boundary for improving oscillation damping through generation redispatch using eigenvalue sensitivities
(Journal article; Peer reviewed, 2018)This paper proposes an algorithm for determining a minimum generation redispatch capable of moving specific oscillation modes to the closest small-signal security boundary that guarantees them a desired damping factor. The ... -
Clustering methods assessment for investment in zero emission neighborhoods’ energy system
(Peer reviewed; Journal article, 2020)This paper investigates the use of clustering in the context of designing the energy system of Zero Emission Neighborhoods (ZEN). ZENs are neighborhoods who aim to have net zero emissions during their lifetime. While ... -
Co-Simulation of Optimal EVSE and Techno-Economic System Design Models for Electrified Fleets
(Peer reviewed; Journal article, 2022)As the transition to electric mobility is expanding at a rapid pace, operationally feasible and economically viable charging infrastructure is needed to support electrified fleets. This paper presents a co-simulation of ... -
Common and differential mode of dc-bias in three-phase power transformers
(Peer reviewed; Journal article, 2022)Dc magnetization due to the geomagnetically induced currents (GICs) and HVDC (High Voltage Direct Current) systems may cause core saturation and result in serious destruction in the transformer performance as well as the ... -
Comparative Evaluation of AC and DC Power Distribution Systems for Underwater Vehicles Based on Multiobjective Optimization Techniques
(Peer reviewed; Journal article, 2020)This paper presents a multiobjective optimization technique for the submarine cables of high-power remotely operated vehicles (ROVs). A detailed design flowchart with integrated electrical and mechanical designs of the ROV ... -
Comparative study on various dielectric barriers and their effect on breakdown voltage
(Journal article; Peer reviewed, 2018)Non-pressurised air is extensively used as basic insulation medium in high-voltage equipment. Unfortunately, an inherent property of air-insulated design is that the system tends to become physically large. On the other ... -
Comparison of AC-Superconducting Multi-Phase Symmetric-Winding Topologies for Wind Power Generators with PM Rotors
(Peer reviewed; Journal article, 2022)In this paper, an AC superconducting multi-phase symmetric-winding machine is designed for a wind power generator to improve its performance and reduce losses, where four handpicked topological designs were explored and ...