Blar i Institutt for elektro, IT, og kybernetikk på tittel
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Noise handling capabilities of multivariate methods
(Journal article; Peer reviewed, 2002)The noise handling capabilities of principal component regression (PCR) and partial least squares regression (PLSR) are somewhat disputed issues, especially regarding regressor noise. In an attempt to indicate an answer ... -
Non-Synchronous Generation Impact on Frequency Response - A Case from Albania
(Chapter, 2020)Albanian electric power generation has been almost totally dependent on hydropower since its system inception. Within the past decade, although modest, there has been some share of power produced from Renewable Energy ... -
Nonlinear observer for hydropower system
(Peer reviewed; Journal article, 2019)Estimation of unmeasured states plays an essential role in the design of control systems as well as for monitoring of hydropower plants. The standard Kalman filter gives the optimum state estimates for linear systems. ... -
Numerical solution of the Saint Venant equation for Non-Newtonian fluid
(Journal article; Peer reviewed, 2014)Non-Newtonian fluid flow through a Venturi channel is studied using the Saint Venant equation. The nonlinear hyperbolic equation is numerically tricky to solve, therefore in this study, we consider the finite volume method ... -
Off-field Testing of Grid Scenarios at Medium Voltage in Flexible AC Transmission Systems involving Wind Energy
(Chapter, 2020)As a result of the geographical location of north-western Germany, the local grid operator EWE NETZ has a pioneer role with respect to the integration of renewable energy sources in existing AC transmission systems. About ... -
Older People’s Attitudes and Perspectives of Welfare Technology in Norway.
(Peer reviewed; Journal article, 2019)Background: In Norway, as in other European countries, the ageing population is increasing rapidly. Governments seek to enable older people stay in their homes for as long as possible, and welfare technology (WT) has been ... -
OMJulia: An OpenModelica API for Julia-Modelica Interaction
(Peer reviewed; Journal article, 2019)Modelica is an object oriented, acausal equation-based language for describing complex, hybrid dynamic models. About ten Modelica implementations exist, of which most are commercial and two are open source; the implementations ... -
On closed loop transient response system identification
(Journal article; Peer reviewed, 2016)Some methods for transient closed loop step response system identification presented in the literature are reviewed. Interestingly some errors in a method published in the early 80’s where propagated into a recently published ... -
On primary output estimation by use of secondary measurements as inputsignals in system identification
(Journal article; Peer reviewed, 1999)In many cases, vital output variables in, e.g., industrial processes cannot be measured online. It is then of interest to estimate these primary variables from manipulated and measured inputs and the secondary output ... -
On the Optimization of Damping Enhancement in a Power System with a Hybrid HVDC Link
(Chapter, 2019)Hybrid HVDC links incorporate both Line Commutated Converters (LCC) and Voltage Source Converters (VSC) systems, thereby gathering the benefits of both technologies. Supplementary Power Oscillation Damping (POD) controllers ... -
On Tuning PI Controllers for Integrating Plus Time Delay Systems
(Journal article, 2010)Some analytical results concerning PI controller tuning based on integrator plus time delay models are worked out and presented. A method for obtaining PI controller parameters, Kp = k , and, Ti = , which ensures a ... -
On-Off and PI control of methane gas production of a pilot anaerobic digestion reactor
(Journal article; Peer reviewed, 2013)A proposed feedback control system for methane flow control of a real pilot anaerobic digestion reactor fed with dairy waste is designed and analyzed using the modified Hill model, which has previously been adapted to the ... -
One-dimensional model of turbulent flow of non-Newtonian drilling mud in non-prismatic channels
(Peer reviewed; Journal article, 2019)One-dimensional model of non-Newtonian turbulent flow in a non-prismatic channel is challenging due to the difficulty of accurately accounting for flow properties in the 1-D model. In this study, we model the 1-D Saint–Venant ... -
Online acoustic chemometric monitoring of fish feed pellet velocity in a pneumatic conveying system
(Journal article; Peer reviewed, 2014-03-14)Fish farmers consider the cost of fish feed pellets as one of the most expensive factors in fish cultivation. Proper control of the handling and conveying systems is necessary to avoid damage and disintegration of the ... -
Online Drilling Fluid Flowmetering in Open Channels with Ultrasonic Level Sensors using Critical Depths
(Journal article; Peer reviewed, 2017)In drilling operations, non-Newtonian drilling fluid is continuously circulated in a closed loop. One of the ways to monitor and regulate drilling operations is by accurately measuring the flow rate of circulating drilling ... -
Online estimation of wax deposition thickness in single-phase sub-sea pipelines based on acoustic chemometrics: A feasibility study
(Journal article; Peer reviewed, 2012-10-25)Wax deposition in sub-sea oil producing pipelines is a concern to the oil producing companies. The deposition of wax in pipelines can cause serious economic implications if not monitored and controlled. Several researchers ... -
Open Active Contour Model For Front Tracking Of Detonation Waves
(Journal article; Peer reviewed, 2017)This paper presents an image processing framework for tracking the front of the detonation wave from a sequence of images. The images are captured by high speed camera during a laboratory gas explosion experiment. By ... -
OpenHPL for Modelling the Trollheim Hydropower Plant
(Peer reviewed; Journal article, 2019)An increase of tightly integrated, renewable energy sources with highly varying production leads to a greater need for flexible hydropower plants to “balance” the intermittent production from these sources. From a systems ... -
Optimal control strategies with nonlinear optimization for an Electric Submersible Pump lifted oil field
(Journal article; Peer reviewed, 2013)In an Electric Submersible Pump (ESP) lifted oil field, the ESP of each oil well should be operated inside its operating window. The total power consumed by the ESPs in the oil field should be minimized. The speed of the ... -
Optimal design and operation of a UASB reactor for dairy cattle manure
(Journal article; Peer reviewed, 2015-02-01)Optimal design and operation of a planned full-scale UASB reactor at a dairy farm are determined using optimization algorithms based on steady state simulations of a dynamic AD process model combined with models of the ...