Browsing NTNU Open by Author "Hovd, Morten"
Now showing items 21-40 of 93
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Contractive set MPC
Sætermoen, Anders (Master thesis, 2013)Model Predictive Control (MPC) is a method much used in the petroleum industries because it can handle multiple states and constraints, and it finds optimal control inputs. The MPC method in this thesis is called contractive ... -
Control Design and Analysis for Discrete Time Bilinear Systems using Sum of Squares Methods
Vatani, Mohsen; Hovd, Morten; Olaru, Sorin (Journal article; Peer reviewed, 2014)In this paper, stabilization of discrete time bilinear systems is investigated by using Sum of Squares (SOS) programming methods and a quadratic Lyapunov function. Starting from the fact that global asymptotic stability ... -
Control design for discrete-time bilinear systems using the scalarized Schur complement
Vatani, Mohsen; Hovd, Morten; Olaru, S (Journal article; Peer reviewed, 2017)In this paper, controller design for discrete-time bilinear systems is investigated by using sum of squares programming methods and quadratic Lyapunov functions. The class of rational polynomial controllers is considered, ... -
Controller Design and Sparse Measurement Selection in Self-optimizing control
Klemets, Jonatan Ralf Axel; Hovd, Morten (Journal article; Peer reviewed, 2018)Self-optimizing control focuses on minimizing loss for processes in the presence of disturbances by holding selected controlled variables at constant set-points. A measurement combination can be found, using the Null-space ... -
Controller Performance Monitoring: Detection and Diagnosis of Oscillations in Control Loops
Aftab, Muhammad Faisal (Doctoral theses at NTNU;2018:187, Doctoral thesis, 2018)The profitability of any industrial process is closely related to its ability to maintain near optimal operating conditions; therefore robust methods for root cause detection of any control performance degradation is crucial ... -
Convergent cross mapping (CCM) based approach for isolating the source of plant-wide disturbances
Aftab, Muhammad Faisal; Hovd, Morten; Sivalingam, Selvanathan (Chapter, 2017)Disturbances originating in one control loop of a large industrial plant can propagate far from the source, giving rise to plant-wide oscillations. The underlying interactions among the different control loops make it hard ... -
Design of parallel compensator and stabilizing controller to mitigate non-minimum phase behaviour of the Czochralski process
Bukhari, Syeda Halima Zahra; Hovd, Morten; Aftab, Muhammad Faisal; Winkler, Jan (Peer reviewed; Journal article, 2020)This paper addresses the design of a parallel compensator and a stabilizing controller for the simplified crystal growth dynamics of the Czochralski (CZ) process, i.e., the process for the production of monocrystalline ... -
Detecting non-linearity induced oscillations via the dyadic filter bank property of multivariate empirical mode decomposition
Aftab, Muhammad Faisal; Hovd, Morten; Sivalingam, Selvanathan (Journal article, 2017)Non-linearity induced oscillations in control loops are characterized by the presence of higher order harmonics. In this paper the dyadic filter bank property of the multivariate empirical mode decomposition (MEMD) is ... -
Development of Model Predictive Control for Setpoint Regulation in Offshore Drilling
Kommedal, Anders (Master thesis, 2021)Dagens olje- og gasselskaper opplever for tiden en svært usikker og volatil markedssituasjon. Med store svingninger i oljeprisen er det avgjørende å holde driftskostnadene på moderate nivåer for å opprettholde lønnsomheten. ... -
Distributed Optimal Control of DAE Systems: Modeling, Algorithms, and Applications
de Aguiar, Marco Aurelio Schmitz (Doctoral theses at NTNU;2022:29, Doctoral thesis, 2022) -
Dynamic Control and Simulation of Conveyor-Belt Dryers: Model-Based Control of Moisture in Fishfeed
Salvador, John Paul (Master thesis, 2008)The removal of moisture from solids is an important and often necessary part of the production process withinseveral different industries. This especially includes the food industry, since almost all food products are dried ... -
Dynamic Simulation of a Natural Gas Liquefaction Plant
Hammer, Morten (Doktoravhandlinger ved NTNU, 1503-8181; 2004:156, Doctoral thesis, 2004)This thesis describes a new general purpose dynamic process simulator applied to a natural gas liquefaction plant. More specifically, the Multi Fluid Cascade Process (MFCP). MFCP is the “Statoil Linde LNG Technology Alliance” ... -
Dynamic State Estimation for Electrical Power Grids
Abooshahab, Mohammad Ali (Doctoral theses at NTNU;2021:273, Doctoral thesis, 2021)Increased electrification of society, as well as increased incidence of distributed power generation, causes more dynamic operation of modern electrical power grids. Methods for monitoring of power grids have traditionally ... -
Efficient Implementation of Dual First Order Algorithms - Application in Embedded MPC
Kvamme, Sverre (Master thesis, 2014)In this Thesis, numerical implementation of optimization algorithms for convex quadratic problems that appear in model predictive control for embedded linear systems, are examined. Different versions of dual first order ... -
Energy Efficient Temperature and Humidity Control in Building Climate Systems
Ghawash, Faiq; Hovd, Morten; Schofield, Brad (Journal article; Peer reviewed, 2024)Energy Efficient building climate control involves maintaining thermal comfort across a wide range of environmental conditions while minimizing energy usage. However, the design of energy Efficient control poses a significant ... -
Energy Optimal Control of Cooling and Ventilation Systems
Ghawash, Faiq (Doctoral theses at NTNU;2024:444, Doctoral thesis, 2024)In the dynamic landscape of an ever changing global economy, efficient energy utilization in large scale industrial systems is the cornerstone of building a sustainable future. Cooling and ventilation systems in industrial ... -
Estimation with low measurement frequency
Leite, Martin (Master thesis, 2017)The invention of the computer has triggered a technological revolution in many parts of society. For the process industry, computers have led to improvement in both production rates, safety and profits. One way this has ... -
Explicit robustness and fragility margins for linear discrete systems with piecewise affine control law
Nguyen, Ngoc Anh; Olaru, Sorin; Rodriguez-Ayerbe, Pedro; Bitsoris, George; Hovd, Morten (Journal article; Peer reviewed, 2016)In this paper, we focus on the robustness and fragility problem for piecewise affine (PWA) control laws for discrete-time linear system dynamics in the presence of parametric uncertainty of the state space model. A generic ... -
Explicit robustness margin for contractive piecewise affine control laws
Koduri, Rajesh; Rodriguez-Ayerbe, Pedro; Olaru, Sorin; Hovd, Morten (Chapter, 2016)This paper deals with the class of discrete-time linear dynamics affected by polytopic uncertainty in closed loop with contractive piecewise affine (PWA) control law. Starting from the hypothesis that the synthesis ensures ... -
Extending a derivative-free model-based trust-region optimization algorithm to account for constraints and partial gradient information - Application to oil field development
Andersen, Joakim Rostrup (Master thesis, 2018)This master's thesis is motivated by the oil field development challenge. This is a very big and complicated task and only one part of it will be in focus, namely, the well placement challenge. When planning a new oil field ...