Browsing NTNU Open by Author "Skogestad, Sigurd"

Now showing items 21-40 of 145

    • Biodiesel Production by the Esterfip-H Process: Modelling, Optimization and Control Structure 

      Øien, Marianne (Master thesis, 2013)
      For this master's thesis the Esterfip-H process for biodiesel production from rapeseed oil have been modelled in Chemcad. Esterfip-H is a two fixed-bed reactor system using a heterogeneous catalyst of zinc aluminate oxide ...

    • Catalytic combustion control 

      Strand, Carina Renée (Master thesis, 2012)
      A mathematical model representing the dynamic behaviour observed at the actual catalytic incineration plant at Perstorp was derived. The model equations for the two main process units, the heat exchanger and the incinerator, ...

    • Changing between Active Constraint Regions for Optimal Operation: Classical Advanced Control versus Model Predictive Control 

      Reyes-Lúa, Adriana; Zotica, Cristina Florina; Das, Tamal; Krishnamoorthy, Dinesh; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)
      Control structures must be properly designed and implemented to maintain optimality. The two options for the supervisory control layer are Advanced Control Structures (ACS) and Model Predictive Control (MPC). To systematically ...

    • Combined state and parameter estimation for not fully observable dynamic systems 

      Backi, Christoph Josef; Gravdahl, Jan Tommy; Skogestad, Sigurd (Journal article, 2020)
      In this paper, a simple, yet novel method for state estimation and parameter identification for dynamic systems is presented. Apart from providing estimates of non-measurable state variables, the algorithm is also capable ...

    • Composition Estimation in Dividing-Wall Columns Using Temperature Measurements 

      Ghadrdan, Maryam; Halvorsen, Ivar j.; Skogestad, Sigurd (Chapter, 2011)
      In this work, we propose a method to estimate the product compositions in a distillation column section based on a combination of a number of temperature measurements from different locations in ...

    • Control and operation of dividing-wall columns with vapor split manipulation 

      Dwivedi, Deeptanshu (Doctoral Theses at NTNU, 1503-8181; 2013:20, Doctoral thesis, 2013)
      Thermally coupled distillation arrangements with dividing-wall implemen- tation provide significant energy and capital savings compared to energy intensive conventional distillation arrangements. In this thesis, the focus ...

    • Control of formaldehyde silver catalyst reactor system 

      Vo, Phuong Ny Lillian Nguyen (Master thesis, 2023)
      I denne oppgaven ble det undersøkt om den nåværende temperaturreguleringen avDyneas formaldehyd sølvkatalysatorprosess kan forbedres. Den nåværende temperaturreguleringen har rom for forbedring, ettersom den strever i visse ...

    • Control of Fuel Cells 

      Zenith, Federico (Doktoravhandlinger ved NTNU, 1503-8181; 2007:65, Doctoral thesis, 2007)
      This thesis deals with control of fuel cells, focusing on high-temperature proton-exchange-membrane fuel cells. Fuel cells are devices that convert the chemical energy of hydrogen, methanol or other chemical compounds ...

    • Control of Steady-state Gradient of an Ammonia Reactor using Transient Measurements 

      Bonnowitz, Harro; Straus, Julian; Krishnamoorthy, Dinesh; Jahanshahi, Esmaeil; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)
      This paper presents the application of a steady-state real-time optimization strategy using transient measurements to an ammonia synthesis reactor case. We apply a new method for estimating the steady-state gradient of the ...

    • Control of steam bottoming cycles using nonlinear input and output transformations for feedforward disturbance rejection 

      Zotica, Cristina Florina; Mocholí Montañés, Rubén; Reyes Lua, Adriana; Skogestad, Sigurd (Peer reviewed; Journal article, 2022)
      In this paper we analyze the control problem for a steam cycle that produces power by recovering waste-heat from gas turbines on an offshore installation. The waste-heat recovery unit is based on once-through steam generator ...

    • Control structure design for a CO2-refrigeration system with heat recovery 

      Andreasen, Glenn; Larsen, Lars F.S.; Stoustrup, Jakob; Skogestad, Sigurd (Journal article; Peer reviewed, 2019)
      In this work, we analyze a generic supercritical CO2-refrigeration system with parallel compression, based on systems used for supermarket use. In order to maximize energy efficiency, this system has a “heat-recovery” ...

    • Control Structure Design for Optimal Oparation of 4-Product Thermally Coupled Columns 

      Dwivedi, Deeptanshu; Halvorsen, Ivar j.; Skogestad, Sigurd (Lecture, 2011)
      Control and operation of energy efficient complex distillation arrangements like Kaibel and Petlyuk columns can be challenging. This paper discusses the control structure design for stabilizing ...

    • Control Structure Design for Two Distillation Columns in Sequence 

      Marvik, Tor Anders (Master thesis, 2014)
      Even for simple distillation systems with only two columns, the control problem can be significant. This project provides an initial outline of a systematic procedure for finding the optimal control structure, through ...

    • Control structures for consistent inventory control with moving bottleneck 

      Skaug, David Alexander Lillevold (Master thesis, 2020)
      Tre forskjellige variasjoner av regulering av innhold ble vurdert i denne rapporten, hver med sitt eget formål: Opprettholding av produksjon, hvor målet er å holde massestrømmene mellom prosessenheter konstant til tross ...

    • Control structures with embedded process knowledge 

      Bjorvand, Simen (Master thesis, 2020)
      I denne oppgaven er det studert en ny metodikk for å transformere ikke-lineære prosesser til lineære prosesser som gir perfekt forstyrrelsesavvisning og dekopling ved bruk av en manipulert variabel (MV) transformasjon. ...

    • Controllability Analysis of Ammonia Synthesis Loops 

      Gullberg, Rebecca Maria Brigitte (Master thesis, 2018)
      Present ammonia synthesis loops normally operate under stationary conditions. Generally, ammonia synthesis loops can be slow to ramp up and down due to manual mode operation. Furthermore, load disturbances are not rejected ...

    • Data-Driven Control Strategies: From MPC to Reinforcement Learning 

      Adhau, Saket (Doctoral theses at NTNU;2024:42, Doctoral thesis, 2024)
      This thesis presents a comprehensive investigation into the integration of machine learning techniques to enhance the performance and applicability of Model Predictive Control (MPC). The main focus is on addressing challenging ...

    • Data-driven Scenario Selection for Multistage Robust Model Predictive Control 

      Krishnamoorthy, Dinesh; Thombre, Mandar; Skogestad, Sigurd; Jäschke, Johannes (Journal article; Peer reviewed, 2018)
      A main assumption in many works considering multistage model predictive control (MPC) is that discrete realizations of the uncertainty are chosen a-priori and that the scenario tree is given. In this work, we focus on ...

    • Design and simulation of dividing wall column for ternary heterogeneous distillation 

      Le, Quang Khoa (Master thesis, 2014)
      Heterogeneous azeotropic distillation is routinely used in chemical industry to separate close boiling point mixtures and azeotropes, which are not easily separated in a normal distillation process. Dividing wall column ...

    • Designing packed multi-partition wall dividing wall columns 

      Dejanovic, I.; Matijasevic, L.; Halvorsen, Ivar J.; Skogestad, Sigurd; Kaibel, B.; Jansen, H.; Olujic, Z. (Lecture, 2011)