Blar i NTNU Open på forfatter "Zotica, Cristina Florina"
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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 ... -
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 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 ... -
Dynamic Simulation of Heat Exchanger with Multicomponent Phase Change
Zotica, Cristina Florina (Master thesis, 2017)A dynamic model for a heat exchanger with multicomponent phase change, part of reliquefaction cycle of natural gas, is developed. The finite control volume method is used to spatially discretize the heat exchange intro a ... -
Optimal Operation and Control of Heat-to-Power Cycles: a New Perspective using a Systematic Plantwide Control Approach
Zotica, Cristina Florina; Nord, Lars O.; Kovács, Jenő; Skogestad, Sigurd (Journal article; Peer reviewed, 2019)We use a systematic plantwide control framework to analyze optimal operation of a simple heatto- power steam cycle with a single pressure level and a drum. The present control solutions for power plants1 have been developed ... -
Optimal Operation with Changing Active Constraint Regions using Classical Advanced Control
Reyes-Lúa, Adriana; Zotica, Cristina Florina; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)With ”classical advanced control” we mean the control structures that are commonly used in industry for multivariable control. These have been in use for at least 50 years, but surprisingly there is little literature ... -
Systematic Design of Split Range Controllers
Reyes-Lúa, Adriana; Zotica, Cristina Florina; Forsman, Leif Krister; Skogestad, Sigurd (Peer reviewed; Journal article, 2019)Split range control is a common advanced control structure in the process industry. It is primarily used to extend the steady-state operating range by using more than one manipulated variable (MV). More generally, it is ...