| 1. |
- Iplik, Esin, et al.
(författare)
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Feasibility study on the use of electrolyzers for short term energystorage
- 2021
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Ingår i: The First SIMS EUROSIM Conference on Modelling and Simulation, SIMS EUROSIM 2021, and 62nd International Conference of Scandinavian Simulation Society. - : Linköping University Electronic Press. - 9789179292195 ; , s. 234-240
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Konferensbidrag (refereegranskat)abstract
- Electricity grid flexibility is vital for renewable energy to be used effectively. Power-to-gas technologies are investigated to connect electricity grid to gas grid and to tackle capacity challenges. Grid management expenses consist of redispatch and feed-in management. These management procedures, next to being costly, cause a significantenergy loss. Proton-exchange membrane electrolyzer installations were studied to reduce these expenses and recover energy. The change in the levelized cost of hydrogen production with varying electrolyzer capacities was presented. The sensitivity of the levelized cost and net presentvalue with respect to installation costs, maintenance costs, and electricity prices were investigated. While the electricity prices have the most significant effect on the levelized cost of hydrogen production, the net present value was affected considerably by the hydrogen selling price. Possible energy savings were calculated between 2 – 23 GWh for 2, 5, 10, 20 MW installations. The annual gridmanagement expense savings were in the range of 0.2– 2.3 million Euros, increasing with the increasing electrolyzer capacity.
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| 2. |
- Leek, Viktor, 1989-, et al.
(författare)
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Accurate Simulation for Numerical Optimal Control
- 2021
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Ingår i: The First SIMS EUROSIM Conference on Simulation and Modelling SIMS EUROSIM 2021. - : Linköping University Electronic Press. - 9789179292195 ; , s. 148-155
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Konferensbidrag (refereegranskat)abstract
- Accurate simulation of the numerical optimal control in software environments where call to simulation routines is explicit, for instance Matlab and SciPy. A discussion on the simulation aspects of numerical optimal control, how it may fail, and how such erroneous results can be detected using accurate simulation. The key contribution is how to accurately include a piecewise constant control input in the simulations, which is discussed in detail, including code examples. The technique is demonstrated on an example problem which show how simulation can be used to analyze optimal control problems with uncertainty, but also demonstrates how erroneous simulation may lead to erroneous conclusions.
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| 3. |
- Leek, Viktor, 1989-, et al.
(författare)
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Developing a Dynamic Diesel Engine Model for Energy Optimal Control
- 2021
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Ingår i: The First SIMS EUROSIM Conference on Simulation and Modelling SIMS EUROSIM 2021. - : Linköping University Electronic Press. - 9789179292195 ; , s. 123-131
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Konferensbidrag (refereegranskat)abstract
- A dynamic heavy-duty Euro 6 diesel engine model for energy optimal control is developed. The modeling focus ison accuracy in the entire engine operating range, with attention to the region of highest efficiency and physically plausible extrapolation. The effect of the air-to-fuel ratio on combustion efficiency is studied, and it is demonstrated how this influences the energy optimal transient control. A convenient, physics-based, method for pressure sensor bias estimation is also presented.
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| 4. |
- Marais, Heidi Lynn, 1996-, et al.
(författare)
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Detectability of Fault Signatures in a Wastewater Treatment Process
- 2021
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Ingår i: Proceedings of The First SIMS EUROSIM Conference on Modelling and Simulation, SIMS EUROSIM 2021, and 62nd International Conference of Scandinavian Simulation Society, SIMS 2021. - : Scandinavian Simulation Society and Linköping University Electronic Press. - 9789179292195 ; , s. 418-423
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Konferensbidrag (refereegranskat)abstract
- In a wastewater treatment plant reliable fault detection is an integral component of process supervision and ensuring safe operation of the process. Detecting and isolating process faults requires that sensors in the process can be used to uniquely identify such faults. However, sensors in the wastewater treatment process operate in hostile environments and often require expensive equipment and maintenance. This work addresses this problem by identifying a minimal set of sensors which can detect and isolate these faults in the Benchmark Simulation Model No. 1.Residual-based fault signatures are used to determine this sensor set using a graph-based approach; these fault signatures can be used in future work developing fault detection methods. It is recommended that further work investigate what sizes of faults are critical to detect based on their potential effects on the process, as well as ways to select an optimal sensor set from multiple valid configurations.
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