Browsing Institutt for elkraftteknikk by Document Types "Journal article"
Now showing items 1-20 of 568
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A Case Study on Medium-Term Hydropower Scheduling with Sales of Capacity
(Peer reviewed; Journal article, 2016)This paper conducts a case study on hydropower scheduling considering sales of capacity reserves and impacts of detailed mod-elling. In latter years a growing demand for reserve capacity has been needed to ensure stable ... -
A generic framework for power system flexibility analysis using cooperative game theory
(Journal article; Peer reviewed, 2017)Electricity grid infrastructures provides valuable flexibility in power systems with high shares of variable supply due to its ability to distribute low-cost supply to load centers (spatial), in addition to interlinking a ... -
A mechanism for allocating benefits and costs from transmission interconnections under cooperation: A case study of the North Sea offshore grid
(Journal article; Peer reviewed, 2018)We propose a generic mechanism for allocating the benefits and costs that result from the development of international transmission interconnections under a cooperative agreement. The mechanism is based on a planning model ... -
A Method to Estimate the Necessary Twist Pitch in Multi-filamentary Superconductors
(Journal article; Peer reviewed, 2014)Twisting of multi-filamentary superconductors is an important step in the development of wires with AC losses at an acceptable level for AC applications. The necessary twist pitch depends on wire architecture, critical ... -
A Model for Techno-Economic Optimization of Wind Power Combined with Hydrogen Production in Weak Grids
(Journal article; Peer reviewed, 2009)This paper presents a two-step method for dimensioning and time-sequential operation of Wind-hydrogen (H2) plants operating in power markets. Step 1 involves identification of grid constraints and marginal power losses ... -
A Modular Series Connected Converter for a 10 MW, 36 kV, Transformer-Less Offshore Wind Power Generator Drive
(Journal article; Peer reviewed, 2012)In the future, large offshore wind turbines are expected to reach a rating of 10 MW. To reduce the corresponding weight increase of the nacelle, research has started to focus on solutions to omit the step-up transformer ... -
A Probabilistic Model-aided Failure Prediction Approach for Spring-Type Operating Mechanism of High Voltage Circuit Breakers
(Journal article; Peer reviewed, 2018)To avoid failures in circuit breakers (CBs) and to extend the lifetime of these critical components, condition-based-maintenance has been increasingly requested by utilities to enable them to efficiently manage their assets. ... -
A real-time energy management system for smart grid integrated photovoltaic generation with battery storage
(Journal article; Peer reviewed, 2019)This paper proposes a real-time energy management system (EMS) suitable for rooftop PV installations with battery storage. The EMS is connected to a smart grid where the price signals indirectly control the power output ... -
A Selective Harmonic Compensation and Power Control Approach Exploiting Distributed Electronic Converters in Microgrids
(Journal article; Peer reviewed, 2019)This paper proposes an approach to obtain harmonic compensation and power control by exploiting the electronic power converters deployed in low-voltage microgrids. By the proposed approach, distributed harmonic current ... -
A Simple Procedure to Evaluate the Efficiency and Power Density of Power Conversion Topologies for Offshore Wind Turbines
(Journal article; Peer reviewed, 2012)The prospective development of the offshore wind energy conversion system is mainly promoted by demand for higher efficiency and power density. This paper describes a simple procedure to calculate the efficiency and power ... -
A stochastic model for contact surfaces at polymer interfaces subjected to an electrical field
(Journal article; Peer reviewed, 2018)Morphology of the contact area between solid insulation materials ultimately determines the short- and long-term electrical properties of the complete insulation system. The main purpose of this paper is to propose a ... -
A Virtual synchronous machine implementation for distributed control of power transformers in SmartGrids
(Peer reviewed; Journal article, 2015)The ongoing evolution of the power system towards a “SmartGrid” implies a dominant role of powerelectronic converters, but poses strict requirements on their control strategies to preserve stability andcontrollability. In ... -
AC Breakdown Voltage of 50-Year-Old Service Aged Hydro Power Generator Stator Bars
(Journal article; Peer reviewed, 2022)Randomly selected generator bars from a 50-year-old Norwegian hydro power generator were examined in this work. Typical non-destructive tests, as partial discharge and dissipation factor measurements were initially performed ... -
AC loss measurements multi-filamentary MgB2 wires with non-magnetic sheath material
(Journal article; Peer reviewed, 2012)The MgB2 superconductor is an attractive choice for many high-current DC applications, particularly for its low cost compared to e.g. YBCO, and the higher operating temperature than the low-temperature superconductors. To ... -
Accelerating electric vehicle charging investments: A real options approach to policy design
(Peer reviewed; Journal article, 2023)Replacing conventional cars and trucks with battery electric vehicles requires a rapid expansion of fast-charging infrastructure. However, private sector charging infrastructure investments are delayed by unfavorable project ... -
Accounting for reserve capacity activation when scheduling a hydropower dominated system
(Journal article; Peer reviewed, 2020)As the penetration of variable renewable power generation increases in power systems around the world, system security is challenged. It is crucial to coordinate the available flexible generating resources, such as hydropower, ... -
Activating the potential of decentralized flexibility and energy resources to increase the EV hosting capacity: A case study of a multi-stakeholder local electricity system in Norway
(Peer reviewed; Journal article, 2021)The increasing amount of flexible load in the energy system represents both a challenge and an opportunity. One primary source of load growth is the electrification of the transport sector and the subsequent charging of ... -
Active Power Filter Pre-Selection Tool to Enhance the Power Quality in Oil and Gas Platforms
(Peer reviewed; Journal article, 2021)This paper proposes a preliminary design tool for active power filters’ (APFs) solutions to be applied in offshore oil and gas platforms, where power quality indices are typically low, and reactive power compensation and ... -
An Adaptive Current-Source Gate Driver for High-Voltage SiC MOSFETs
(Peer reviewed; Journal article, 2022)This paper presents a novel current-source gate driver for Silicon Carbide (SiC) metal oxide semiconductor field-effect transistors (MOSFETs) with adaptive functionalities. The proposed driver aims to decouple and improve ... -
Advanced Fault Detection of Synchronous Generators using Stray Magnetic Field
(Peer reviewed; Journal article, 2021)Many methods used for precise fault detection in salient pole synchronous generators (SPSGs) often require a priori knowledge of the healthy case, but this requirement impedes application of the methods since an accurate ...