Blar i Øvrige samlinger på forfatter "Uhlen, Kjetil"

A Topology-based Scheme for Adaptive Underfrequency Load Shedding

Duong, Dinh Thuc; Uhlen, Kjetil (Chapter, 2017)

This paper presents a topology-based scheme for adaptive underfrequency load shedding (UFLS). By tracking changes of power system topology and information about power flow, the proposed method is able to identify islanded ...

Avoiding AC/DC grid interaction in MMC based MTDC Systems

Endegnanew, Atsede Gualu; Bergna-Diaz, Gilbert; Uhlen, Kjetil (Chapter, 2017)

In this paper, the interaction between ac and dc grids is studied for two types of MMC control structures; conventional and non-conventional control structures. Linear analysis methods that are based mode shapes and ...

Case Study of Integrating an Offshore Wind Farm with Offshore Oil and Gas Platforms and with an Onshore Electrical Grid

He, Wei; Uhlen, Kjetil; Hadiya, Maheshkumar; Shi, Gang; del Rio, Emilio (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 ...

Closest security boundary for improving oscillation damping through generation redispatch using eigenvalue sensitivities

Parreiras, TJMA; Gomes, S; Taranto, Glauco Nery; Uhlen, Kjetil (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 ...

Control Challenges and Possibilities for Offshore Wind Farms

Anaya-Lara, Olimpo; Tande, John Olav Giæver; Uhlen, Kjetil; Adaramola, Muyiwa S. (SINTEF Energi. Rapport;, Research report, 2013)

Electricity generation from large offshore wind farms is being gradually accepted as a feasible solution to meet the rapid increase in energy demands. However, although the technology is progressing fast, a major drawback ...

Coordinated Control of Multiple HVDC links using backstepping

Ersdal, Anne Mai; Imsland, Lars Struen; Uhlen, Kjetil (Journal article, 2012)

This article regards a power system containing multiple High Voltage Direct Current (HVDC) links. The topic is to exploit the HVDC lines’ ability to control the power supplied by them to increase the stability of the system. ...

Detecting instant of multiple faults on the transmission line and its types using time-frequency analysis

Na, Shweta; Kishor, Nand; Uhlen, Kjetil; Mohanty, Soumya R (Journal article; Peer reviewed, 2019)

In a complex interconnected network, due to dynamic interaction between the AC networks, at the time of multiple occurrences of faults, the successful relay operation is threatened. For security and reliability of power ...

Development of a test system for identification of turbine dynamics using the dc power flow

Jakobsen, Sigurd Hofsmo; Uhlen, Kjetil (Journal article; Peer reviewed, 2018)

Recent concerns about the frequency quality in the Nordic power system has lead to increased research on hydro turbine governors. Among this research is the use of system identification methods. However, there has been no ...

Dynamic simulation of simultaneous HVDC contingencies relevant for vulnerability assessment of the nordic power system

Solvang, Espen Hafstad; Sperstad, Iver Bakken; Jakobsen, Sigurd Hofsmo; Uhlen, Kjetil (Chapter, 2019)

Large power-infeed of individual HVDC interconnectors may make the power system vulnerable to contingencies involving multiple HVDC interconnectors. This paper describes and demonstrates an approach to quantitative ...

Estimation of Oscillatory Mode Activity from PMU Measurements

Haugdal, Hallvar; Uhlen, Kjetil; Müller, Daniel; Jóhannsson, Hjörtur (Chapter, 2020)

We propose a method for estimating the activity of oscillatory modes in power systems. The frequencies and mode shapes of the modes of interest are assumed to be known beforehand, either from linear modal analysis or from ...

Estimation of Power System Inertia From Ambient Wide Area Measurements

Tuttelberg, Kaur; Kilter, Jako; Wilson, Douglas; Uhlen, Kjetil (Journal article, 2018)

This study presents a method of estimating the effective inertia of a power system from ambient frequency and active power signals measured by phasor measurement units. Most importantly, we demonstrate that inertia can be ...

Event Detection and its Signal Characterization in PMU Data Stream

Negi, Sanjay Singh; Kishor, Nand; Uhlen, Kjetil; Negi, Richa (Journal article; Peer reviewed, 2017)

The potential application of signal processing techniques is not only to detect the event but also to characterize them according to physical disturbance. In this paper, event detection and its characterization algorithm ...

Event signal characterization for disturbance interpretation in power grid

Negi, Sanjay S.; Kishor, Nand; Negi, Richa; Uhlen, Kjetil (Chapter, 2018)

This paper presents the signal processing approach to detect and characterize the physical events that occur in power system using PMUs signals. A small window is applied so that the extracted spectral features belong to ...

Fault Detection and Prediction in Smart Grids

Andresen, Christian Andre; Torsæter, Bendik Nybakk; Haugdal, Hallvar; Uhlen, Kjetil (Chapter, 2018)

Modern society is to a larger and larger extent dependant on electric energy, and hence the reliance on and utilization of the electric grid is increasing steadily. At the same time the production and consumption patterns ...

Flexibility needs in the future power system

Hillberg, Emil; Zegers, Antony; Herndler, Barbara; Wong, Steven; Pompee, Jean; Bourmaud, Jean-Yves; Lehnhoff, Sebastian; Migliavacca, Gianluigi; Uhlen, Kjetil; Oleinikova, Irina; Pihl, Hjalmar; Norstrom, Markus; Persson, Mattias; Rossi, Joni; Beccuti, Giovanni (Research report, 2019)