Browsing NTNU Open by Author "Knudsen, Brage Rugstad"
Now showing items 1-20 of 29
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An exact penalty-function approach to proactive fault-tolerant economic MPC
Knudsen, Brage Rugstad; Brusevold, Jon Håman; Foss, Bjarne Anton (Chapter, 2017)This paper presents a fault-tolerant economic model predictive control scheme for proactive handling of incipient actuator faults. The scheme applies an L1 exact penalty function with a set of switching rules in order to ... -
Decarbonizing integrated chlor-alkali and vinyl chloride monomer production: Reducing the cost with industrial flexibility
Foslie, Sverre Stefanussen; Straus, Julian; Knudsen, Brage Rugstad; Korpås, Magnus (Peer reviewed; Journal article, 2023)Industrial demand response will become increasingly important in power grids with high shares of variable renewables, yet the existing knowledge on how the industrial electricity demand and flexibility will change with the ... -
Decarbonizing the European energy system in the absence of Russian gas: Hydrogen uptake and carbon capture developments in the power, heat and industry sectors
Durakovic, Goran; Zhang, Hongyu; Knudsen, Brage Rugstad; Tomasgard, Asgeir; Crespo del Granado, Pedro Andres (Peer reviewed; Journal article, 2023)Hydrogen and carbon capture and storage are pivotal to decarbonize the European energy system in a broad range of pathway scenarios. Yet, their timely uptake in different sectors and distribution across countries are ... -
Dynamic optimization of control setpoints for an integrated heating and cooling system with thermal energy storages
Rohde, Daniel; Knudsen, Brage Rugstad; Andresen, Trond; Nord, Natasa (Journal article; Peer reviewed, 2019)Energy systems for buildings and neighborhoods are expected to become more complex and flexible. Advanced control strategies are required to exploit the full potential of this flexibility and are especially important for ... -
Global Optimisation of Multi-Plant Manganese Alloy Production
Digernes, Martin Naterstad; Rudi, Lars; Andersson, Henrik; Stålhane, Magnus; Wasbø, Stein O.; Knudsen, Brage Rugstad (Journal article; Peer reviewed, 2017)This paper studies the problem of multi-plant manganese alloy production. The problem consists of finding the optimal furnace feed of ores, fluxes, coke, and slag that yields output products which meet customer specifications, ... -
Hierarchical nonlinear model predictive control of offshore hybrid power systems
Hoang, Kiet Tuan; Knudsen, Brage Rugstad; Imsland, Lars Struen (Peer reviewed; Journal article, 2022)This paper presents an approach for controlling ofshore hybrid power systems consisting of gas turbines, offshore wind, and batteries for satisfying an exogenous power demand. A hierarchical controller is developed comprising ... -
Hybrid Versus Radial Offshore Wind Connections: Power Grid Investments in the North Sea
Sævareid, Erik; Durakovic, Goran; Knudsen, Brage Rugstad; Straus, Julian; Tomasgard, Asgeir (Chapter, 2022)To enable offshore wind in the North Sea to take a key, rapid role in the European energy transition, massive grid expansions and investments are required. We consider the impact of such grid expansion in the North Sea on ... -
Hydrogen for harvesting the potential of offshore wind: A North Sea case study
Bødal, Espen Flo; Holm, Sigmund Eggen; Rammohan Subramanian, Avinash Shankar; Durakovic, Goran; Pinel, Dimitri; Hellemo, Lars; Muñoz Ortiz, Miguel; Knudsen, Brage Rugstad; Straus, Julian (Peer reviewed; Journal article, 2024)Economical offshore wind developments depend on alternatives for cost-efficient transmission of the generated energy to connecting markets. Distance to shore, availability of an offshore power grid and scale of the wind ... -
Incipient Actuator Fault Handling in Nonlinear Model Predictive Control
Knudsen, Brage Rugstad; Faulwasser, Timm; Jones, Colin N.; Foss, Bjarne Anton (Journal article; Peer reviewed, 2017)This paper presents a reconfigurable nonlinear model predictive control (NMPC) scheme for handling of incipient actuator faults in nonlinear plants. The scheme seeks to ensure recoverability from an incipient actuator fault ... -
Integrated design and operational optimization of energy systems in dairies
Foslie, Sverre Stefanussen; Knudsen, Brage Rugstad; Korpås, Magnus (Journal article; Peer reviewed, 2023)Around 70% of worldwide industrial energy use is today based on fossil energy. Electrification of low temperature heat in this sector is pointed out as a key measure to reduce emissions. A large amount of the low temperature ... -
Investment planning under uncertainty in energy systems: Modelling and algorithms
Zhang, Hongyu (Doctoral theses at NTNU;2024:21, Doctoral thesis, 2024)This thesis applies operational research methods for the investment planning of energy systems under uncertainty for the energy transition. We develop new models and solution methods. On the modelling side, we first ... -
Mathematical programming formulations for piecewise polynomial functions
Grimstad, Bjarne Andre; Knudsen, Brage Rugstad (Journal article; Peer reviewed, 2020)This paper studies mathematical programming formulations for solving optimization problems with piecewise polynomial (PWP) constraints. We elaborate on suitable polynomial bases as a means of efficiently representing PWPs ... -
Mixed-Integer Nonlinear Programming Heuristics Applied to a Shale Gas Production Optimization Problem
Sharma, Shaurya (Master thesis, 2013)Mixed-Integer nonlinear programs(MINLPs) are a general class of nonlinear optimization problems that have a wide array of real-world applications. These problems are in general notoriously difficult to solve, and it is ... -
Model Predictive Control of District Heating Systems
Rene, Anders Svenheim (Master thesis, 2016)A district heating system is a network of pipelines where heating is delivered to a number of customers from a centralized heating station. For the operators of these systems, the ideal operating scenario is to deliver ... -
Modelling and analysis of offshore energy hubs
Zhang, Hongyu; Tomasgard, Asgeir; Knudsen, Brage Rugstad; Svendsen, Harald Georg; Bakker, Steffen J.; Grossmann, Ignacio E. (Peer reviewed; Journal article, 2022)Clean offshore energy hubs may become pivotal for efficient offshore wind power generation and distribution. In addition, offshore energy hubs may provide decarbonised energy supply for maritime transport, oil and gas ... -
Next frontiers in energy system modelling: A review on challenges and the state of the art
Fodstad, Marte; Crespo del Granado, Pedro; Hellemo, Lars; Knudsen, Brage Rugstad; Pisciella, Paolo; Silvast, Antti; Bordin, Chiara; Schmidt, Sarah; Straus, Julian (Peer reviewed; Journal article, 2022)Energy Systems Modelling is growing in relevance on providing insights and strategies to plan a carbon-neutral future. The implementation of an effective energy transition plan faces multiple challenges, spanning from the ... -
A nonlinear model predictive control scheme for sensor fault tolerance in observation processes
Knudsen, Brage Rugstad; Alessandretti, Andrea; Jones, Colin N.; Foss, Bjarne Anton (Peer reviewed; Journal article, 2020)This article addresses the problem of designing a sensor fault‐tolerant controller for an observation process where a primary, controlled system observes, through a set of measurements, an exogenous system to estimate the ... -
Offshore Energy Hubs in the Decarbonisation of the Norwegian Continental Shelf
Zhang, Hongyu; Tomasgard, Asgeir; Knudsen, Brage Rugstad; Grossmann, Ignacio E. (Chapter, 2022)This paper studies the investment planning of a decarbonised Norwegian continental shelf energy system considering the connection and interfaces with the European energy system. A multi-horizon stochastic mixed-integer ... -
On Shut-In Based Production Optimization of Shale-Gas Systems
Knudsen, Brage Rugstad (Doktoravhandlinger ved NTNU, 1503-8181; 2014:285, Doctoral thesis, 2014)The use of shale gas as an energy resource has increased extensively over the last decade, with emerging new technologies causing shale gas to become the largest source of growth in the US natural-gas supply. Ecient ... -
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 ...