Article (Scientific journals)
Real-Time Optimization of Organic Rankine Cycle Systems by Extremum-Seeking Control
Hernandez Naranjo, Jairo Andres; Desideri, Adriano; Ionescu, Clara et al.
2016In Energies, 9
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Keywords :
extremum-seeking (ES) control; organic Rankine cycle; model predictive control
Abstract :
[en] In this paper, the optimal operation of a stationary sub-critical 11kWel organic Rankine cycle (ORC) unit for waste heat recovery (WHR) applications is investigated, both in terms of energy production and safety conditions. Simulation results of a validated dynamic model of the ORC power unit are used to derive a correlation for the evaporating temperature, which maximizes the power generation for a range of operating conditions. This idea is further extended using a perturbation-based extremum seeking (ES) algorithm to identify online the optimal evaporating temperature. Regarding safety conditions, we propose the use of the extended prediction self-adaptive control (EPSAC) approach to constrained model predictive control (MPC). Since it uses input/output models for prediction, it avoids the need for state estimators, making it a suitable tool for industrial applications. The performance of the proposed control strategy is compared to PID-like schemes. Results show that EPSAC-MPC is a more effective control strategy, as it allows a safer and more efficient operation of the ORC unit, as it can handle constraints in a natural way, operating close to the boundary conditions where power generation is maximized.
Disciplines :
Energy
Author, co-author :
Hernandez Naranjo, Jairo Andres ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Desideri, Adriano ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Ionescu, Clara
De Keyser, Robin
Lemort, Vincent  ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Quoilin, Sylvain  ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Language :
English
Title :
Real-Time Optimization of Organic Rankine Cycle Systems by Extremum-Seeking Control
Publication date :
2016
Journal title :
Energies
ISSN :
1996-1073
Publisher :
MDPI, Basel, Switzerland
Volume :
9
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 May 2016

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