Blar i Institutt for elektro, IT, og kybernetikk på tittel
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Modelling the synchronisation control for a hydro power controller
(Peer reviewed; Journal article, 2021)This paper presents the modelling of a synchronisation control as used inside a typical hydro power controller for small hydro power plants. It was built using the open-source modelling language Modelica by use of the ... -
Modelling the System Dynamics of Islanding Asynchronous Generators
(Journal article; Peer reviewed, 2014-03)Asynchronous generators are often used for small hydro power stations with an installed power capacity of under 1MW. The reason for this is their robustness and low cost. In order do be able to produce active electrical ... -
Models for control of thermal energy in buildings
(Peer reviewed; Journal article, 2019)A large fraction of the world’s energy production is used for HVAC in buildings. It is therefore important to develop improved strategies for ef?cient use of energy in buildings. Storage of intermittent energy production ... -
Modified Smith-predictor multirate control utilizing secondary process measurements
(Journal article; Peer reviewed, 2007)The Smith-predictor is a well-known control structure for industrial time delay systems, where the basic idea is to estimate the non-delayed process output by use of a process model, and to use this estimate in an inner ... -
Modified Smith-predictor multirate control utilizing secondary process measurements
(Conference report, 2001)The Smith-predictor is a well-known control structure for industrial time delay systems, where the basic idea is to estimate the nondelayed process output by use of a process model, and to use this estimate in an inner ... -
Monitoring of Erosion in a Pneumatic Conveying System by Non-intrusive Acoustic Sensors – A Feasibility Study
(Journal article; Peer reviewed, 2019)This paper presents the results of a study where the feasibility of a non-invasive acoustic measurement method was tested for monitoring of erosion in a pneumatic conveying system during the dilute-phase conveying of sand. ... -
Monitoring of scale formation in a pneumatic conveying system operating in a metal production plant
(Journal article; Peer reviewed, 2019)Monitoring of scale progression in a pneumatic conveying system operating in a metal production plant was conducted during a five-month long monitoring period. A combination of an acoustic monitoring method and a laser ... -
Monitoring of scaling in dilute phase pneumatic conveying systems using non-intrusive acoustic sensors – A feasibility study
(Journal article; Peer reviewed, 2019)Scale formation in pneumatic conveying systems is a major industrial challenge. The underlying scale formation mechanisms can be intricate as they often involve a combination of several mutually enhancing binding forces ... -
MPC Operation with Improved Optimal Control Problem at Dalsfoss Power Plant
(Peer reviewed; Journal article, 2021)The operational conditions at the Dalsfoss power station are complicated due to many requirements such as environmental regulations and safety constraints. Model predictive control (MPC) has been in use at this power station ... -
Multi-Core Platform of Admittance Matrix Formation of Power Systems: Computational Time Assessment
(Chapter, 2020)This paper presents a comparison of computational time required to build the admittance matrix of five test systems (ranging from 200 to 70,000 nodes) considering two formation approaches: element-by-element and matrix ... -
Multimodal Tomometry for Slug Detection in two Phase Flow
(Journal article; Peer reviewed, 2012)Electrical Capacitance and Resistance Tomometric (ECTm/ ERTm) approaches are attractive for measurement and control applications in the process industries. By using the time series of raw resistance and capacitance values ... -
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 ...