Blar i NTNU Open på forfatter "Skogestad, Sigurd"
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Distributed Feedback-Optimizing Control Strategies: an Experimental Validation
Aas, Vegard (Master thesis, 2023)I industrielle settinger består prosesser ofte av flere undersystemer som deler en felles begrensning, for eksempel en delt ressurs. Denne oppgaven fokuserer på steady-state sanntidsoptimalisering (RTO) problemet i et ... -
Dividing wall columns for natural gas liquefaction plants
Halvorsen, Ivar Johan; Dejanovic, Igor; Olujic, Zarko; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)In order to meet current carbon dioxide emissions reduction challenges, natural gas processing and refining industries have to find the ways to minimize energy requirements of distillation operations. Building on foundations ... -
Dynamic Extremum Seeking Control Using ARX model
Ryu, Jeongrim (Master thesis, 2018)In the design of the dynamic ESC, a wave perturbation is decided to be not a sinusoidal wave but a pseudo-random binary sequence(PRBS) wave. The reason behind this is that diverse frequencies in the PRBS wave make the ARX ... -
Dynamic model and Optimization of Recirculating Aquaculture System
Khanh, Hoang Dam (Master thesis, 2021)Abstract will be available on 2024-06-30 -
Dynamic modeling and optimalization of the cheese making procedure
Kjellstrøm, Tomas Tungen (Master thesis, 2017)This thesis has successfully derived an dynamic model based on analytic solutions for production of semi-hard cheeses on the basis of raw milk from the cattle breed Norwegian red. The main emphasis has been to create a ... -
Dynamic Simulation of Heat Exchanger with Multicomponent Phase Change
Zotica, Cristina Florina (Master thesis, 2017)A dynamic model for a heat exchanger with multicomponent phase change, part of reliquefaction cycle of natural gas, is developed. The finite control volume method is used to spatially discretize the heat exchange intro a ... -
Economic Plantwide Control for a Methanol Plant using Commercial Process Simulation Software
Reyes Lua, Adriana (Master thesis, 2014)It is desired to make the Economic Plantwide Control design procedure proposed by Skogestad (2000, 2004, 2012) available for engineers without deep knowledge of process control or optimization. The integration of the use ... -
Energy efficient distillation
Skogestad, Sigurd; Halvorsen, Ivar Johan (Journal article; Peer reviewed, 2011)Distillation is responsible for a significant amount of the energy consumption of the world’s process industry and also in the natural gas processing. There is a significant energy saving potential that can be obtained by ... -
Feedback Real-Time Optimization Strategy Using a Novel Steady-state Gradient Estimate and Transient Measurements
Krishnamoorthy, Dinesh; Jahanshahi, Esmaeil; Skogestad, Sigurd (Journal article; Peer reviewed, 2019)This paper presents a new feedback real-time optimization (RTO) strategy for steady-state optimization that directly uses transient measurements. The proposed RTO scheme is based on controlling the estimated steady-state ... -
Finding Self-optimizing Control Variables Using Process Data
Simonsen, Rannei Solbak (Master thesis, 2014)In this project we have studied a newly developed way to find self-optimizing variables. The method studied in this thesis uses data measurements, y, to fit a quadratic cost function. By using parameters found in the cost ... -
Gas-lift Optimization by Controlling Marginal Gas-Oil Ratio using Transient Measurements
Krishnamoorthy, Dinesh; Jahanshahi, Esmaeil; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)This paper presents the application of a steady-state gradient control using transient measurements to a gas-lift optimization problem. Optimal operation of a gas-lifted field involves controlling the marginal gas-oil ratio ... -
Gaussian process-based grey-box modelling of heat exchanger networks
Lindbak, Michael (Master thesis, 2021)Veiledet læring er et felt som vokser raskt i kjemiverdenen i takt med en stadig voksende popularitet for maskinlæring. Potensialet bak disse metodene er trolig uendelig, og det er et appellerende forskningstema som blir ... -
Heat exchanger network self-optimising control: Application to the crude unit at Mongstad refinery
Leruth, Alexandre (Master thesis, 2012)This work applies the concept of self-optimising control for the operation of the given network. The steady-state performances of the self-optimising variables derived by Jäschke (Jäschke, 2012) are assessed and two main ... -
HYSYS Modelling of a Horizontal Three-Phase Subsea Separator
Famisa, Rotimi Bayode (Master thesis, 2016)Subsea separators are very useful in the subsea for the separation of hydrocarbons and water. Its application has added value to the oil and gas industry as well as minimize the negative impacts of subsea operations on the ... -
Improved PI control for a surge tank satisfying level constraints
Reyes Lua, Adriana; Backi, Christoph Josef; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)This paper considers the case of averaging level control, where the main objective is to reduce flow variations by using varying liquid levels. However, to avoid overfilling or emptying the tank, the liquid level needs to ... -
Improving Scenario Decomposition for Multistage MPC using a Sensitivity-based Path-following Algorithm
Krishnamoorthy, Dinesh; Suwartadi, Eka; Foss, Bjarne Anton; Skogestad, Sigurd; Jäschke, Johannes (Journal article; Peer reviewed, 2018)This letter proposes a computationally efficient algorithm for robust multistage scenario model predictive control (MPC). In multistage scenario MPC, the evolution of uncertainty in the prediction horizon is represented ... -
Influence of Feed Rate on Temperature Controllers in Multicomponent Distillation Columns (in cooperation with Statoil/Gassco at Kårstø)
Dolgov, Iakov (Master thesis, 2012)In this thesis two simulation programs were compared, Unisim and D-spice. This was done by creating a model of three columns in series in Unisim and comparing the dynamic behavior of these models with the models in D-spice. ... -
Input transformation for linearization, decoupling and disturbance rejection with application to steam networks
Zotica, Cristina; Skogestad, Sigurd (Peer reviewed; Journal article, 2021)Pressure-flow networks are inherently multivariable, coupled and nonlinear systems that are not straightforward handled by conventional PID controllers. In this work, we analyze the control problem for a steam distribution ... -
Integrative approach of modeling, optimization, control and experimental design in microbial biocatalytic processes: Applications to Corynebacterium glutamicum cell factory
Parada, Pedro Antonio Lira (Doctoral theses at NTNU;2021:289, Doctoral thesis, 2021)Global demand for food, pharmaceuticals and energy is constantly increasing, and the transition from a historically hydrocarbon-based economy to a green and renewable energy based-economy is accelerating due to the demands ... -
L1 Adaptive Anti-Slug Control
Ohrem, Sveinung Johan; Holden, Christian; Jahanshahi, Esmaeil; Skogestad, Sigurd (Journal article; Peer reviewed, 2017)In many multiphase pipeline-riser systems, anti-slug control is necessary to ensure steady and optimal operation. In this paper, we propose using an ℒ1 adaptive controller as an augmentation to standard PI control to ...