Browsing NTNU Open by Author "Hovd, Morten"
Now showing items 41-60 of 85
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Hierarchical Decentralized State Estimation With Unknown Correlation for Multiple and Partially Overlapping State Vectors
Klemets, Jonatan Ralf Axel; Hovd, Morten (Chapter, 2018)A fusion method for hierarchical decentralized state estimation is investigated with unknown cross-correlation. The process is divided into several local estimators for different subsystems that can operate independently ... -
Improved oscillation detection via noise-assisted data analysis
Aftab, Muhammad Faisal; Hovd, Morten; Sivalingam, Selvanathan (Journal article; Peer reviewed, 2018)Oscillation detection is usually a precursor to more advanced performance monitoring steps such as plant wide oscillation detection and root cause detection. Therefore any false or missed detection can have serious ... -
Indirect Finite Control Set Model Predictive Control of Modular Multilevel Converters
Vatani, Mohsen; Behrooz, Bahrani; Saeedifard, Maryam; Hovd, Morten (Journal article; Peer reviewed, 2015)The modular multilevel converter (MMC) is a potential candidate for medium/high-power applications, specifically for high-voltage direct current transmission systems. One of the main challenges in the control of an MMC ... -
Inverse response behaviour in the bright ring radius measurement of the Czochralski process I: Investigation
Bukhari, Syeda Halima Zahra; Hovd, Morten; Winkler, Jan (Peer reviewed; Journal article, 2021)This is the first part of a two-article series that deals with the investigation of the anomalous behaviour in the radius measurement signal of the Czochralski (Cz) process and its mitigation in a feedback control system. ... -
Inverse response behaviour in the bright ring radius measurement of the Czochralski process II: Mitigation by control
Bukhari, Syeda Halima Zahra; Hovd, Morten; Winkler, Jan (Peer reviewed; Journal article, 2021)This is the second part of a two-article series investigating the presence of an inverse response in the measurement of the ingot radius in the Czochralski process for monocrystalline silicon production, when the ingot ... -
Limitations on control performance in the Czochralski crystal growth process using bright ring measurement as a controlled variable
Bukhari, Halima Zahra; Hovd, Morten; Winkler, Jan (Journal article; Peer reviewed, 2019)This paper develops a dynamical model for crystal diameter in the Czochralski process for production of monocrystalline silicon. The model combines simplified crystal growth dynamics with rigorous ray tracing to describe ... -
Linear and Nonlinear State Estimation in the Czochralski Process
Rahmanpour, Parsa; Bones, John Atle; Hovd, Morten; Gravdahl, Jan Tommy (Journal article; Peer reviewed, 2013)The Czochralski process is the only method used commercially for production of monocrystalline silicon for semiconductor and solar cell applications. This paper explores the use of mathematical modeling as an aid in ... -
Low complexity constrained control using higher degree Lyapunov functions
Munir, Sarmad; Hovd, Morten; Olaru, Sorin (Journal article; Peer reviewed, 2018)Explicit Model Predictive Control often has a complex solution in terms of the number of regions required to define the solution and the corresponding memory requirement to represent the solution in the online implementation. ... -
Lyapunov-based Proportional-Integral Controller Design with Guaranteed Region of Convergence for dc-dc Power Converters
Vatani, Mohsen; Hovd, Morten (Chapter, 2017)In this paper, Lyapunov stability of dc-dc power converters controlled with proportional-integral (PI) controllers is investigated. The class of dc-dc converters with discrete-time bilinear averaged dynamic model is ... -
Machine learning procedures for automatic well planning in reservoir simulation models
Kristoffersen, Brage Strand (Doctoral theses at NTNU;2021:404, Doctoral thesis, 2021)Simulation of reservoir models is a tool to optimize the development of an oil and gas reservoir. Part of the development is placement of wells in the reservoir, and this well placement optimization process is performed ... -
Model Predictive Control based on Sliding Mode Control
Spasić, Miodrag (Doctoral theses at NTNU;2019:333, Doctoral thesis, 2019)Design of a controller that is capable to control the process in order to obtain desired overall system performance is a standard problem in all industries. Use of computers and microprocessors have resulted in increased ... -
Model Predictive Control of Compressor Systems
Batalov, Arthur (Master thesis, 2012)The purpose of this thesis was to investigate the suitability of applying MPC for the performance control of compressor systems. Dynamic model of the Kårstø gas compression system was used as a process model in D-spice ... -
Model Predictive Control of Induced Draft Cooling Towers in a Large Scale Cooling Plant
Ghawash, Faiq; Hovd, Morten; Schofield, Brad (Peer reviewed; Journal article, 2022)We study the problem of designing a model predictive control strategy for multiple induced draft cooling towers. The common objective of the cooling towers is to regulate the outlet water temperature of the common collection ... -
Model-based Control of the Czochralski Silicon Crystal Pulling Process
Rahmanpour, Parsa (Doctoral theses at NTNU;2017:49, Doctoral thesis, 2017)This study explores the use of mathematical modeling as an aid in automatic control of the standard Czochralski process (Cz). The aim of the modeling has been to develop a simple model, while covering the essential process ... -
Modeling and control of a calcination furnace
Wilson, Øyvind (Master thesis, 2017)Calcined anthracite is the primary material used in Søderberg electrode paste, prebaked carbon electrodes, aluminium cathodes, and a variety of other carbon products used in the metallurgical industries. In electrical ... -
Modeling and Control of the Czochralski Crystal Growth Process
Bukhari, Halima Zahra (Doctoral theses at NTNU;2021:269, Doctoral thesis, 2021)This thesis provides the basis for improved control of the Czochralski (Cz) process – a process used on a commercial scale to produce monocrystalline silicon (Si) ingots. This is done by developing a model for the crystal ... -
Modeling and Model Predictive Control of a Conveyor-Belt Dryer: Applied to the Drying of Fish Feed
Johansen van Delft, Tord (Master thesis, 2010)Moisture control of industrial processes is often difficult and complex. The product composition and moisture content changes as disturbances affect the upstream production processes. When there are changes in the product ... -
Modellering, regulering og simulering av brokran i PIDstop-rammeverket.
Askeland, Tor Erik (Master thesis, 2009)MPC begynner å bli en akseptert regulator innen industri hvor den drar fordeler av å håndtere multivariable problemer, begrensninger både i pådrag og tilstander. I tillegg er den en enkel regulator å forstå for en operatør. ... -
Modelling and Control of Brobekk Waste Incineration Plant
Pehrson, Håvard (Master thesis, 2010)Model Predictive Control of Brobekk waste incineration plant is the main focus of this master thesis. The motivation for using MPC at Brobekk is primarily to improve the control of the temperature towards the combustion ... -
Modelling and Control of the Secondary Combustion Chamber in an Energy from Waste Plant
Guldberg, Kristin (Master thesis, 2012)Thermal conversion of municipal and industrial waste is an environmentally friendly way to recover energy from waste. There are many governmental requirements regarding air emissions from such processes. A tight control ...