Documents disponibles écrits par cet auteur

Dynamics and control of a tubular solid-oxide fuel cell / S. Ahmad Hajimolana in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6112–6125 Titre : Dynamics and control of a tubular solid-oxide fuel cell Type de document : texte imprimé Auteurs : S. Ahmad Hajimolana, Auteur ; Masoud Soroush, Auteur Année de publication : 2009 Article en page(s) : pp. 6112–6125 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Tubular  solid  oxide  fuel  cell  system  Dynamic  compartmental  model  Dynamic  outlet  voltage Résumé : This paper presents a study of the dynamic behavior and control of a tubular solid oxide fuel cell system. A dynamic compartmental model that is based on first principles is developed. The model accounts for diffusion processes, inherent impedance, transport (heat and mass transfer) processes, electrochemical processes, anode and cathode activation polarizations, and internal reforming/shifting reactions, among others. Dynamic outlet voltage, current, and fuel-cell−tube temperature responses of the cell to step changes in external load resistance and conditions of the feed streams are presented. Simulation results show that the fuel cell is a multitime-scale system; some of the cell output responses exhibit consecutive apparent dominant time constants, ranging from ∼0.2 ms to ∼40 s. They also reveal that the temperature and pressure of the inlet air stream and the temperature of the inlet fuel stream strongly affect the dynamics of the fuel cell system. The temperature of the inlet air stream has the strongest effect on the cell performance, and the effects of the inlet air and fuel velocities on the cell response are weaker than those of inlet feed pressures and temperatures. A simple control system is then implemented to control the fuel-cell outlet voltage and cell−tube temperature through manipulation of the pressure and temperature of the inlet air stream, respectively. The results show that the control system can successfully reject unmeasured step changes (disturbances) in the load resistance, the velocity of the inlet air stream, and the pressure, temperature, and velocity of the inlet fuel stream. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801555d [article] Dynamics and control of a tubular solid-oxide fuel cell [texte imprimé] / S. Ahmad Hajimolana, Auteur ; Masoud Soroush, Auteur . - 2009 . - pp. 6112–6125. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6112–6125 Mots-clés : Tubular  solid  oxide  fuel  cell  system  Dynamic  compartmental  model  Dynamic  outlet  voltage Résumé : This paper presents a study of the dynamic behavior and control of a tubular solid oxide fuel cell system. A dynamic compartmental model that is based on first principles is developed. The model accounts for diffusion processes, inherent impedance, transport (heat and mass transfer) processes, electrochemical processes, anode and cathode activation polarizations, and internal reforming/shifting reactions, among others. Dynamic outlet voltage, current, and fuel-cell−tube temperature responses of the cell to step changes in external load resistance and conditions of the feed streams are presented. Simulation results show that the fuel cell is a multitime-scale system; some of the cell output responses exhibit consecutive apparent dominant time constants, ranging from ∼0.2 ms to ∼40 s. They also reveal that the temperature and pressure of the inlet air stream and the temperature of the inlet fuel stream strongly affect the dynamics of the fuel cell system. The temperature of the inlet air stream has the strongest effect on the cell performance, and the effects of the inlet air and fuel velocities on the cell response are weaker than those of inlet feed pressures and temperatures. A simple control system is then implemented to control the fuel-cell outlet voltage and cell−tube temperature through manipulation of the pressure and temperature of the inlet air stream, respectively. The results show that the control system can successfully reject unmeasured step changes (disturbances) in the load resistance, the velocity of the inlet air stream, and the pressure, temperature, and velocity of the inlet fuel stream. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801555d

Mathematical modeling, steady-state and dynamic behavior, and control of fuel cells: a review / Mona Bavarian in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7922–7950 Titre : Mathematical modeling, steady-state and dynamic behavior, and control of fuel cells: a review Type de document : texte imprimé Auteurs : Mona Bavarian, Auteur ; Masoud Soroush, Auteur Année de publication : 2010 Article en page(s) : pp 7922–7950 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mathematical  modeling  Control  fuel  cells. Résumé : This paper presents a review of recent publications on mathematical modeling, steady-state and dynamic behavior, and control of polyelectrolyte membrane and solid oxide fuel cells. We limited the scope of this review to these two fuel cell types, which have been studied more, and have been reported to be more promising, than other fuel cell types. Zero-, one-, two-, and three-dimensional models developed to describe the behavior of the fuel cells are reviewed. Essential components of these models are highlighted. Conditions under which a fuel cell exhibits steady state multiplicity are described. Stability of the steady states is discussed. Processes that take place inside the fuel cells and contribute to the existence of multiple time-scales in the fuel cells are examined. Control configurations and strategies proposed and used for the fuel cells are reviewed, and advantages and disadvantages of each are listed. At the end, in view of the current status of the research activities, topics that require further research studies are discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100032c [article] Mathematical modeling, steady-state and dynamic behavior, and control of fuel cells: a review [texte imprimé] / Mona Bavarian, Auteur ; Masoud Soroush, Auteur . - 2010 . - pp 7922–7950. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7922–7950 Mots-clés : Mathematical  modeling  Control  fuel  cells. Résumé : This paper presents a review of recent publications on mathematical modeling, steady-state and dynamic behavior, and control of polyelectrolyte membrane and solid oxide fuel cells. We limited the scope of this review to these two fuel cell types, which have been studied more, and have been reported to be more promising, than other fuel cell types. Zero-, one-, two-, and three-dimensional models developed to describe the behavior of the fuel cells are reviewed. Essential components of these models are highlighted. Conditions under which a fuel cell exhibits steady state multiplicity are described. Stability of the steady states is discussed. Processes that take place inside the fuel cells and contribute to the existence of multiple time-scales in the fuel cells are examined. Control configurations and strategies proposed and used for the fuel cells are reviewed, and advantages and disadvantages of each are listed. At the end, in view of the current status of the research activities, topics that require further research studies are discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100032c

Model predictive control tuning methods / Jorge L. Garriga in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3505–3515 Titre : Model predictive control tuning methods : A review Type de document : texte imprimé Auteurs : Jorge L. Garriga, Auteur ; Masoud Soroush, Auteur Année de publication : 2010 Article en page(s) : pp. 3505–3515 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Control  tuning  methods Résumé : This paper provides a review of the available tuning guidelines for model predictive control, from theoretical and practical perspectives. It covers both popular dynamic matrix control and generalized predictive control implementations, along with the more general state-space representation of model predictive control and other more specialized types, such as max-plus-linear model predictive control. Additionally, a section on state estimation and Kalman filtering is included along with auto (self) tuning. Tuning methods covered range from equations derived from simulation/approximation of the process dynamics to bounds on the region of acceptable tuning parameter values. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900323c [article] Model predictive control tuning methods : A review [texte imprimé] / Jorge L. Garriga, Auteur ; Masoud Soroush, Auteur . - 2010 . - pp. 3505–3515. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3505–3515 Mots-clés : Control  tuning  methods Résumé : This paper provides a review of the available tuning guidelines for model predictive control, from theoretical and practical perspectives. It covers both popular dynamic matrix control and generalized predictive control implementations, along with the more general state-space representation of model predictive control and other more specialized types, such as max-plus-linear model predictive control. Additionally, a section on state estimation and Kalman filtering is included along with auto (self) tuning. Tuning methods covered range from equations derived from simulation/approximation of the process dynamics to bounds on the region of acceptable tuning parameter values. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900323c

On the effects of tunable parameters of model predictive control on the locations of closed-loop eigenvalues / Jorge L. Garriga in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7951–7956 Titre : On the effects of tunable parameters of model predictive control on the locations of closed-loop eigenvalues Type de document : texte imprimé Auteurs : Jorge L. Garriga, Auteur ; Masoud Soroush, Auteur Année de publication : 2010 Article en page(s) : pp 7951–7956 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Tunable  parameters  Predictive  control. Résumé : This paper presents an analytical study of the effects of model predictive control (MPC) tunable parameters on the closed-loop performance quantified in terms of the location(s) of closed-loop eigenvalue(s) of several common, single-input single-output, linear plants with inactive constraints. Symbolic manipulation capabilities of MATHEMATICA are used to obtain analytical expressions describing the dependence of closed-loop eigenvalues on the tunable parameters. This work is first to investigate how MPC tuning parameters affect the locations of the eigenvalues of the closed-loop system of a plant in the discrete-time setting. It provides theoretical basis/justification for several existing qualitative MPC tuning rules and proposes new tuning guidelines. For example, as the prediction horizon is increased while other tunable parameters remain constant, a subset of the closed-loop eigenvalues (poles) move toward the open-loop eigenvalues (poles) of the plant, if the plant is asymptotically stable. If a prediction horizon much longer than the reference-trajectory time constant is used, the value of the reference-trajectory time constant has little effect on the closed-loop performance. As the weights on the magnitude or the rate of change of the manipulated input are increased, the closed-loop eigenvalues move toward the open-loop eigenvalues. As the control horizon is increased from one, the dominant eigenvalue of the closed-loop system initially moves toward the origin and then away from the origin to a location that does not change with a further increase in the control horizon. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100030e [article] On the effects of tunable parameters of model predictive control on the locations of closed-loop eigenvalues [texte imprimé] / Jorge L. Garriga, Auteur ; Masoud Soroush, Auteur . - 2010 . - pp 7951–7956. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7951–7956 Mots-clés : Tunable  parameters  Predictive  control. Résumé : This paper presents an analytical study of the effects of model predictive control (MPC) tunable parameters on the closed-loop performance quantified in terms of the location(s) of closed-loop eigenvalue(s) of several common, single-input single-output, linear plants with inactive constraints. Symbolic manipulation capabilities of MATHEMATICA are used to obtain analytical expressions describing the dependence of closed-loop eigenvalues on the tunable parameters. This work is first to investigate how MPC tuning parameters affect the locations of the eigenvalues of the closed-loop system of a plant in the discrete-time setting. It provides theoretical basis/justification for several existing qualitative MPC tuning rules and proposes new tuning guidelines. For example, as the prediction horizon is increased while other tunable parameters remain constant, a subset of the closed-loop eigenvalues (poles) move toward the open-loop eigenvalues (poles) of the plant, if the plant is asymptotically stable. If a prediction horizon much longer than the reference-trajectory time constant is used, the value of the reference-trajectory time constant has little effect on the closed-loop performance. As the weights on the magnitude or the rate of change of the manipulated input are increased, the closed-loop eigenvalues move toward the open-loop eigenvalues. As the control horizon is increased from one, the dominant eigenvalue of the closed-loop system initially moves toward the origin and then away from the origin to a location that does not change with a further increase in the control horizon. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100030e