{"id":698,"date":"2021-09-30T20:45:39","date_gmt":"2021-09-30T20:45:39","guid":{"rendered":"https:\/\/elo-x.eu\/?p=698"},"modified":"2024-07-01T09:45:33","modified_gmt":"2024-07-01T09:45:33","slug":"jean-pierre-allamaa-2","status":"publish","type":"post","link":"https:\/\/elo-x.eu\/?p=698","title":{"rendered":"Ramin Abbasi"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\t\t\n\t\t\t\tRamin Abbasi \n\t\t\t<\/h2 > \n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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PhD Candidate in Engineering Science at KU Leuven<\/span><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Atlas Copco Airpower<\/b><\/span><\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Ramin Abbasi graduated from KU Leuven as a mechanical engineer with a focus on systems and control theory in 2017. His interest in mathematical optimization led him to research in the field of optimal control theory. His thesis focused on an optimal co-design of controllers (Linear Feedback and Model Predictive Controller) and trajectory for systems using nonlinear programming. He is investigating model predictive algorithms for compressor room control at Atlas Copco.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Project description<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The aim of this project is the design and development of tailored model predictive algorithms for compressor room control, executable on constraint CPUs. A compressor room ecosystem consists of compressors, auxiliary devices, buffer vessels, and complex networks of pipes. Every compressor and the auxiliary device (dryers and air separators) that leave the production area are steered via a so-called local controller that adjusts the required pressure, sets alarms, monitors sensors, and controls the different actuators. In many cases, however, customers require air demand that cannot be provided by a single compressor, while air demand can vary throughout time. In both cases, multiple compressors are typically used in parallel. A group of compressors is termed a compressor room and is typically regulated by a central controller whose main purpose is to regulate the compressors in such a way so that they provide pressurized air in the most energy-efficient way and\/or ensure an equal number of running hours for all involved compressors. Lately, new applications are emerging with a strong focus on high-quality pressurized airflows (marginal oil and particle contamination, extremely low humidity, etc.). However, current control algorithms do not have the flexibility to support these new applications. Providing control algorithms that have the flexibility to deal with a wide range of requirements (e.g., flow, pressure, air quality) puts serious constraints on the type of control technologies and requires new control algorithms and control concepts. A significantly improved control algorithm will open new opportunities, and it is expected to provide solutions with a further reduction of the energy consumption in the compressor room. MPC is believed to offer a good answer to the latter challenges.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tRead more about this project<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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1.<\/div>

Abbasi-Esfeden, Ramin; Nurkanovic, Armin; Diehl, Moritz; Patrinos, Panagiotis; Swevers, Jan<\/p>

An Efficient Mixed-Integer Formulation and an Iterative Method for Optimal Control of Switched Systems Under Dwell Time Constraints<\/a> Working paper<\/span> <\/p>

2025<\/span>.<\/p>

Abstract<\/a><\/span> | Links<\/a><\/span> | BibTeX<\/a><\/span><\/p>

@workingpaper{abbasiesfeden2025efficientmixedintegerformulationiterative,
\r\ntitle = {An Efficient Mixed-Integer Formulation and an Iterative Method for Optimal Control of Switched Systems Under Dwell Time Constraints},
\r\nauthor = {Ramin Abbasi-Esfeden and Armin Nurkanovic and Moritz Diehl and Panagiotis Patrinos and Jan Swevers},
\r\nurl = {https:\/\/arxiv.org\/abs\/2501.05158},
\r\nyear  = {2025},
\r\ndate = {2025-01-09},
\r\nabstract = {This paper presents an efficient Mixed-Integer Nonlinear Programming (MINLP) formulation for systems with discrete control inputs under dwell time constraints. By viewing such systems as a switched system, the problem is decomposed into a Sequence Optimization (SO) and a Switching Time Optimization (STO) -- the former providing the sequence of the switched system, and the latter calculating the optimal switching times. By limiting the feasible set of SO to subsequences of a master sequence, this formulation requires a small number of binary variables, independent of the number of time discretization nodes. This enables the proposed formulation to provide solutions efficiently, even for large numbers of time discretization nodes. To provide even faster solutions, an iterative algorithm is introduced to heuristically solve STO and SO. The proposed approaches are then showcased on four different switched systems and results demonstrate the efficiency of the MINLP formulation and the iterative algorithm.},
\r\nkeywords = {},
\r\npubstate = {published},
\r\ntppubtype = {workingpaper}
\r\n}
\r\n<\/pre><\/div>
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This paper presents an efficient Mixed-Integer Nonlinear Programming (MINLP) formulation for systems with discrete control inputs under dwell time constraints. By viewing such systems as a switched system, the problem is decomposed into a Sequence Optimization (SO) and a Switching Time Optimization (STO) -- the former providing the sequence of the switched system, and the latter calculating the optimal switching times. By limiting the feasible set of SO to subsequences of a master sequence, this formulation requires a small number of binary variables, independent of the number of time discretization nodes. This enables the proposed formulation to provide solutions efficiently, even for large numbers of time discretization nodes. To provide even faster solutions, an iterative algorithm is introduced to heuristically solve STO and SO. The proposed approaches are then showcased on four different switched systems and results demonstrate the efficiency of the MINLP formulation and the iterative algorithm.<\/div>
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