Browsing NTNU Open by Author "Hovd, Morten"
Now showing items 41-60 of 94
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Fault Detection, Localization and Clearance for MMC based on Indirect Finite Control Set Model Predictive Control
Hamayoon, Saad; Hovd, Morten; Suul, Jon Are Wold (Chapter, 2023)In this paper, indirect finite control set model predictive control (I-FCS-MPC) is used for detecting, localizing, and tolerating open-circuit failures in the transistors without the use of arm voltage sensors. The fault ... -
Feedforward for Stabilization of an Ammonia Synthesis Reactor
Holter, Erik (Master thesis, 2010)This thesis illustrates different control structures and tries to demonstrate how feedforward control can be used in stabilizing an unstable ammonia reactor with heat integration. The demonstration of feedforward is done ... -
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 Closed-Loop Reservoir Management (CLRM): System-Theoretic Approaches
Diaa-Eldeen, Tarek (Doctoral theses at NTNU;2025:88, Doctoral thesis, 2025) -
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 ... -
Indirect Model Predictive Control with Sparse Nonlinear Regression on Erdös-Rényi-generated Bernoulli-SIR Network Models
Hjulstad, Jonas Bagøien; Hovd, Morten (Journal article; Peer reviewed, 2023)Epidemiological modeling is important in order to be able to predict and mitigate the consequences of epidemics. Disease transmission network models can be used to model epidemics on a detailed level, which in turn can ... -
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 Predictive Control of Modular Multilevel Converters Using Ramp Functions
Walderhaug, Ole Johan Ellingsen (Master thesis, 2024)FN trekker fram tilgang til pålitelig og fornybar energi som et av flere nødvendige mål for å gjennomføre bærekraftig utvikling. Høyspent likestrømsoverføring er viktig for sammenkobling av strømnett og tilgjengelighet av ... -
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 ...