Blar i NTNU Open på forfatter "Jäschke, Johannes"
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Optimal scheduling of flexible thermal power plants with lifetime enhancement under uncertainty
Rúa, Jairo; Verheyleweghen, Adriaen; Jäschke, Johannes; Nord, Lars O. (Peer reviewed; Journal article, 2021)Renewable energy sources have been the focal point to decarbonise the power sector. The large deployment of these intermittent power generation units requires mechanisms to balance the grid. Thermal power plants can provide ... -
Optimal tuning of PID controllers: And the verification of the SIMC rules
Grimholt, Chriss (Doctoral theses at NTNU;2018:389, Doctoral thesis, 2018)Optimal tuning of PID controllers and the verification of the SIMC rules The simple PI/PID controller is the most used controller in the process industry. However, finding good settings for this simple controller is not ... -
Optimization of flexible renewable energy systems under uncertainty
Nordby, Petter Engblom (Master thesis, 2021)Fleksibilitet for energisystem er et begrep som brukes om evnen til å dekke en usikker og varierende etterspørsel av energi. For fornybare energisystemer kan tilstrekkelig fleksibilitet bli et problem på grunn av naturlige ... -
Optimization of Heat Exchanger Networks using Aspen Energy Analyzer and SeqHENS
Aas, Eskild (Master thesis, 2019)Syntese av nettverk for varmevekslere har vært et av de mest undersøkte områdene innen prosessindustrien de siste 40 årene. I løpet av 70-tallet ble det rettet stor oppmerksomhet mot dette området på grunn av den første ... -
Optimization of Operation and Remaining Lifetime of a Subsea System
Moen, Morten Aulin (Master thesis, 2016)A model of a subsea system was developed and optimization for operation and remaining life time. For the modelling of the remaining life time the compressor efficiency was used as there is no statistical or physical model ... -
Optimizing the Capacity of Thermal Energy Storage in Industrial Clusters
Thombre, Mandar; Prakash, Sandeep; Knudsen, Brage Rugstad; Jäschke, Johannes (Chapter, 2020)A key factor for energy-efficient industrial clusters is the recovery of waste heat. To this end, thermal energy storage (TES) is an appealing technology that facilitates dynamic heat integration between supplier and ... -
Plantwide control of alkaline water electrolyzer plant for hydrogen production
Rizwan, Md (Master thesis, 2020)I arbeidet med å dempe klimagassutslipp er utvikling av teknologier som reduserer avhengigheten av fossile brenselbaserte energikilder uunnværlig. For tiden tilbyr hydrogenbaserte teknologier som involverer utvikling av ... -
Real Time Optimization and Nonlinear Model Predictive Control of a Gas Lifted Oil Network
Yahia, Sarry Haj (Master thesis, 2018)As oil reserves become scarcer, oil production and recovery must be enhanced. The gas lift is one of the techniques used to enhance oil production and recovery. It is usually used in reservoirs that suffer from insufficient ... -
A regularized Moving Horizon Estimator for combined state and parameter estimation in a bioprocess experimental application
Tuveri, Andrea; Nakama, Caroline Satye Martins; Matias, José O.A.; Eng Holck, Haakon; Jäschke, Johannes; Imsland, Lars Struen; Bar, Nadav S (Peer reviewed; Journal article, 2023)Due to the lack or high costs of measurement devices to monitor and control metabolites in microbial cultivation processes, state estimators are often required. These estimators depend on available on-line measurements and ... -
Reinforcement learning in process control
Mageli, Eskild Ruud (Master thesis, 2019)Bruk av forsterkningsinnlæring som kontroller i prosessindustriene ble utforsket som et alternativ for kontroll til sammenligning med vanlige kontrollere. I denne oppgaven var forsterkningsinnlæringsmetodene value based- ... -
Risk-based health-aware control of Åsgard subsea gas compression station
Ims, Julie Berge (Master thesis, 2018)Safe and efficient operation of subsea processing systems imposes strict requirements with respect to equipment design and reliability. This is to avoid accidental shutdowns, which can lead to expensive maintenance ... -
Self-Optimizing Control of an Offshore Blue Hydrogen Plant
Oh, Yoonsik (Master thesis, 2023)Utviklingen av fornybare energikilder øker stadig, men ytterligere fremgang er nødvendig. Oppdagelsen av nye metoder for å produsere miljøvennlig drivstoff og energikilder er avgjørende, med hydrogen som et lovende alternativ. ... -
Self-Optimizing Control Structures for Active Constraint Regions of a Sequence of Distillation Columns
Leer, Roald Bræck (Master thesis, 2012)Investigating and mapping active constraint regions for processes, and subsequently finding control structures for each region, is vital for their optimal operation. In this work, active constraint regions of three different ... -
Simple and Robust Formulations of the Unscented Kalman Filter and Model Predictive Control
Krog, Halvor Aarnes (Doctoral theses at NTNU;2024:93, Doctoral thesis, 2024)This thesis focuses mainly on state estimation by the Unscented Kalman filter (UKF), and partly on robust nonlinear model predictive control (RNMPC). Our aim is to refine or develop algorithms which are simple to implement, ... -
A simple dynamic optimization-based approach for sizing thermal energy storage using process data
Martins Nakama, Caroline Satye; Knudsen, Brage Rugstad; Tysland, Agnes Camilla; Jäschke, Johannes (Peer reviewed; Journal article, 2023)Thermal energy storage (TES) can increase waste heat utilization in district heating (DH) by storing excess energy to be used later to compensate for energy deficit. When sizing a TES tank for DH, incorporating operational ... -
The Simple Solution for Nonlinear State Estimation of Ill-Conditioned Systems: The Normalized Unscented Kalman Filter
Krog, Halvor Aarnes; Jäschke, Johannes (Journal article; Peer reviewed, 2023)An easy-to-implement method for nonlinear state estimation for ill-conditioned systems is proposed. By propagating standard deviations and correlations instead of the covariance in the unscented Kalman filter (UKF), the ... -
Simplified First-Principles Model of a Compact Flotation Unit for Use in Optimization and Control
Das, Tamal; Jäschke, Johannes (Journal article; Peer reviewed, 2019)In this paper, we develop a simplified control-oriented model of a compact flotation unit (CFU), which removes residual oil from produced water in oil and gas production systems. CFU is a class of separators that exploits ... -
Steady-state real-time optimization using transient measurements on an experimental rig
Matias, José O.A.; Oliveira, Julio P.C.; Le Roux, Galo A. C.; Jäschke, Johannes (Peer reviewed; Journal article, 2022)Real-time optimization with persistent parameter adaptation (ropa) is an rto approach, where the steady-state model parameters are updated dynamically using transient measurements. Consequently, we avoid waiting for a ... -
Superstructure Optimization of Early Stage Offshore Oil Field Development with Subsea Processing
Krogstad, Dag Svenningsson (Master thesis, 2018)The oil and gas industry has been subject to a series of challenges during the last couple of decades, including increased water depths, step-out distances and harsher environmental and operational conditions. This has ... -
Using a neural network for estimating plant gradients in real-time optimization with modifier adaptation
Matias, José O.A.; Jäschke, Johannes (Journal article; Peer reviewed, 2019)In the presence of structural plant-model mismatch, standard real-time optimization (RTO) schemes are prone to compute an operation point that does not coincide with the plant optimum. Modifier Adaptation (MA) methods are ...