Associate Professor Suchin Arunsawatwong, Ph.D.
รศ. ดร.สุชิน อรุณสวัสดิ์วงศ์
Education
- Ph.D. (Control Engineering), University of Manchester Institute of Science and Technology, U.K., 1995
- M.Eng. (Electrical Engineering) Chulalongkorn University, Thailand, 1988
- B.Eng. (Electrical Engineering) Chulalongkorn University, Thailand, 1985
Email: suchin.a@chula.ac.th
Research Interest
- control systems design
- stability analysis
- delay systems
- nonlinear control systems
- fractional PID control
- load frequency control
- power system stabilizer design
- numerical optimization.
Research Cluster
Link to
1.
Arunsawatwong, S; Chuman, T
Design of non-rational MIMO feedback systems with inputs and outputs satisfying certain bounding conditions by using rational approximants Journal Article
In: International Journal of Automation and Computing, vol. 14, no. 3, pp. 360-370, 2017, ISSN: 14768186, (cited By 0).
@article{Arunsawatwong2017,
title = {Design of non-rational MIMO feedback systems with inputs and outputs satisfying certain bounding conditions by using rational approximants},
author = {S Arunsawatwong and T Chuman},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85002125795&doi=10.1007%2fs11633-016-0991-5&partnerID=40&md5=6bf65c9733ba096014ed0514ab819189},
doi = {10.1007/s11633-016-0991-5},
issn = {14768186},
year = {2017},
date = {2017-01-01},
journal = {International Journal of Automation and Computing},
volume = {14},
number = {3},
pages = {360-370},
publisher = {Chinese Academy of Sciences},
abstract = {When a feedback system has components described by non-rational transfer functions, a standard practice in designing such a system is to replace the non-rational functions with rational approximants and then carry out the design with the approximants by means of a method that copes with rational systems. In order to ensure that the design carried out with the approximants still provides satisfactory results for the original system, a criterion of approximation should be explicitly taken into account in the design formulation. This paper derives such a criterion for multi-input multi-output (MIMO) feedback systems whose design objective is to ensure that the absolute values of every error and every controller output components always stay within prescribed bounds whenever the inputs satisfy certain bounding conditions. The obtained criterion generalizes a known result which was derived for single-input single-output (SISO) systems; furthermore, for a given rational approximant matrix, it is expressed as a set of inequalities that can be solved in practice. Finally, a controller for a binary distillation column is designed by using the criterion in conjunction with the method of inequalities. The numerical results clearly demonstrate that the usefulness of the criterion in obtaining a design solution for the original system. © 2016, Institute of Automation, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.},
note = {cited By 0},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
When a feedback system has components described by non-rational transfer functions, a standard practice in designing such a system is to replace the non-rational functions with rational approximants and then carry out the design with the approximants by means of a method that copes with rational systems. In order to ensure that the design carried out with the approximants still provides satisfactory results for the original system, a criterion of approximation should be explicitly taken into account in the design formulation. This paper derives such a criterion for multi-input multi-output (MIMO) feedback systems whose design objective is to ensure that the absolute values of every error and every controller output components always stay within prescribed bounds whenever the inputs satisfy certain bounding conditions. The obtained criterion generalizes a known result which was derived for single-input single-output (SISO) systems; furthermore, for a given rational approximant matrix, it is expressed as a set of inequalities that can be solved in practice. Finally, a controller for a binary distillation column is designed by using the criterion in conjunction with the method of inequalities. The numerical results clearly demonstrate that the usefulness of the criterion in obtaining a design solution for the original system. © 2016, Institute of Automation, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.
2.
Chuman, T; Arunsawatwong, S
Criterion of approximation for designing 2 × 2 feedback systems with inputs satisfying bounding conditions Journal Article
In: ECTI Transactions on Electrical Engineering, Electronics, and Communications, vol. 13, no. 1, pp. 1-10, 2015, ISSN: 16859545, (cited By 0).
@article{Chuman2015,
title = {Criterion of approximation for designing 2 × 2 feedback systems with inputs satisfying bounding conditions},
author = {T Chuman and S Arunsawatwong},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981194210&partnerID=40&md5=7154275efc140d6792f78213bd62ce93},
issn = {16859545},
year = {2015},
date = {2015-01-01},
journal = {ECTI Transactions on Electrical Engineering, Electronics, and Communications},
volume = {13},
number = {1},
pages = {1-10},
publisher = {ECTI Association},
abstract = {A common practice in designing a feedback system with a non-rational transfer matrix is to replace the non-rational matrix with an appropriate rational approximant during the design process so that reliable and efficient computational tools for rational systems can be utilized. Consequently, a criterion of approximation is required to ensure that the controller obtained from the approximant still provides satisfactory results for the original system. This paper derives such a criterion for the case of two-input two-output feedback systems in which the design objective is to ensure that the errors and the controller outputs always stay within prescribed bounds whenever the inputs satisfy certain bounding conditions. For a given rational approximant matrix, the criterion is expressed as a set of inequalities that can be solved in practice. It will be seen that the criterion generalizes a known result for single-input single-output systems. Finally, a controller for a binary distillation column is designed by using the criterion in conjunction with the method of inequalities. © 2015, ECTI Association. All rights reserved.},
note = {cited By 0},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A common practice in designing a feedback system with a non-rational transfer matrix is to replace the non-rational matrix with an appropriate rational approximant during the design process so that reliable and efficient computational tools for rational systems can be utilized. Consequently, a criterion of approximation is required to ensure that the controller obtained from the approximant still provides satisfactory results for the original system. This paper derives such a criterion for the case of two-input two-output feedback systems in which the design objective is to ensure that the errors and the controller outputs always stay within prescribed bounds whenever the inputs satisfy certain bounding conditions. For a given rational approximant matrix, the criterion is expressed as a set of inequalities that can be solved in practice. It will be seen that the criterion generalizes a known result for single-input single-output systems. Finally, a controller for a binary distillation column is designed by using the criterion in conjunction with the method of inequalities. © 2015, ECTI Association. All rights reserved.
3.
Arunsawatwong, S; Tia, K; Eua-Arporn, B
Design of static var compensator for power systems subject to voltage fluctuation satisfying bounding conditions Journal Article
In: ECTI Transactions on Electrical Engineering, Electronics, and Communications, vol. 9, no. 2, pp. 297-307, 2011, ISSN: 16859545, (cited By 1).
@article{Arunsawatwong2011297,
title = {Design of static var compensator for power systems subject to voltage fluctuation satisfying bounding conditions},
author = {S Arunsawatwong and K Tia and B Eua-Arporn},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80055099461&partnerID=40&md5=acb4393051ee5a1afe49b54effc46e62},
issn = {16859545},
year = {2011},
date = {2011-01-01},
journal = {ECTI Transactions on Electrical Engineering, Electronics, and Communications},
volume = {9},
number = {2},
pages = {297-307},
publisher = {ECTI Association},
abstract = {This paper presents the design of a static var compensator for power systems subject to voltage fluctuation by using a known framework comprising the principle of matching and the method of inequalities. In the design formulation, all possible voltage fluctuations are treated as persistent signals having uniform bounds on magnitude and slope. The principal design objective is to ensure that the rotor angle, the generator terminal voltage and the voltage of the nearby bus always deviate from their nominal values within the allowable ranges for all time in the presence of any possible voltage fluctuation. By virtue of the framework, it is clear that once a solution is found, the system is guaranteed to operate satisfactorily in regard to the design objective. The numerical results demonstrate that the framework adopted here is suitable and effective, thereby giving a realistic formulation of the design problem.},
note = {cited By 1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper presents the design of a static var compensator for power systems subject to voltage fluctuation by using a known framework comprising the principle of matching and the method of inequalities. In the design formulation, all possible voltage fluctuations are treated as persistent signals having uniform bounds on magnitude and slope. The principal design objective is to ensure that the rotor angle, the generator terminal voltage and the voltage of the nearby bus always deviate from their nominal values within the allowable ranges for all time in the presence of any possible voltage fluctuation. By virtue of the framework, it is clear that once a solution is found, the system is guaranteed to operate satisfactorily in regard to the design objective. The numerical results demonstrate that the framework adopted here is suitable and effective, thereby giving a realistic formulation of the design problem.
4.
Silpsrikul, W; Arunsawatwong, S
Computation of peak output for inputs satisfying many bounding conditions on magnitude and slope Journal Article
In: International Journal of Control, vol. 83, no. 1, pp. 49-65, 2010, ISSN: 00207179, (cited By 15).
@article{Silpsrikul2010,
title = {Computation of peak output for inputs satisfying many bounding conditions on magnitude and slope},
author = {W Silpsrikul and S Arunsawatwong},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-72549100563&doi=10.1080%2f00207170903089813&partnerID=40&md5=33642ae2ea38d361b92bddc4177394e0},
doi = {10.1080/00207170903089813},
issn = {00207179},
year = {2010},
date = {2010-01-01},
journal = {International Journal of Control},
volume = {83},
number = {1},
pages = {49-65},
abstract = {The evaluation of peak outputs is an essential component of control systems design in which the outputs are required to remain within their prescribed bounds in the presence of all possible inputs. Characterising a possible set with many bounding conditions can reduce conservatism, thereby yielding a better design. However, this gives rise to difficulty in computing the peak outputs using analytical techniques. This article develops a practical method for computing the peak outputs of linear time-invariant systems for a class of possible sets characterised with many bounding conditions on the two- and/or the infinity-norms of the inputs and their slopes. The original infinite-dimensional convex optimisation problem is approximated as a large-scale convex programme defined in a Euclidean space with sparse matrices, which can be solved efficiently in practice. A case study of control design for a building subject to seismic disturbances is reinvestigated, where three bounding conditions are used. The numerical results show that the design so obtained is better than the previous one.},
note = {cited By 15},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The evaluation of peak outputs is an essential component of control systems design in which the outputs are required to remain within their prescribed bounds in the presence of all possible inputs. Characterising a possible set with many bounding conditions can reduce conservatism, thereby yielding a better design. However, this gives rise to difficulty in computing the peak outputs using analytical techniques. This article develops a practical method for computing the peak outputs of linear time-invariant systems for a class of possible sets characterised with many bounding conditions on the two- and/or the infinity-norms of the inputs and their slopes. The original infinite-dimensional convex optimisation problem is approximated as a large-scale convex programme defined in a Euclidean space with sparse matrices, which can be solved efficiently in practice. A case study of control design for a building subject to seismic disturbances is reinvestigated, where three bounding conditions are used. The numerical results show that the design so obtained is better than the previous one.
5.
Arunsawatwong, S; Nguyen, Q Van
Design of retarded fractional delay differential systems using the method of inequalities Journal Article
In: International Journal of Automation and Computing, vol. 6, no. 1, pp. 22-28, 2009, ISSN: 14768186, (cited By 9).
@article{Arunsawatwong2009,
title = {Design of retarded fractional delay differential systems using the method of inequalities},
author = {S Arunsawatwong and Q Van Nguyen},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-58549092573&doi=10.1007%2fs11633-009-0022-x&partnerID=40&md5=29d36b5fe19bf5800d0d64feb0999ce2},
doi = {10.1007/s11633-009-0022-x},
issn = {14768186},
year = {2009},
date = {2009-01-01},
journal = {International Journal of Automation and Computing},
volume = {6},
number = {1},
pages = {22-28},
abstract = {Methods based on numerical optimization are useful and effective in the design of control systems. This paper describes the design of retarded fractional delay differential systems (RFDDSs) by the method of inequalities, in which the design problem is formulated so that it is suitable for solution by numerical methods. Zakian's original formulation, which was first proposed in connection with rational systems, is extended to the case of RFDDSs. In making the use of this formulation possible for RFDDSs, the associated stability problems are resolved by using the stability test and the numerical algorithm for computing the abscissa of stability recently developed by the authors. During the design process, the time responses are obtained by a known method for the numerical inversion of Laplace transforms. Two numerical examples are given, where fractional controllers are designed for a time-delay and a heat-conduction plants. © 2009 Institute of Automation, Chinese Academy of Sciences and Springer-Verlag GmbH.},
note = {cited By 9},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Methods based on numerical optimization are useful and effective in the design of control systems. This paper describes the design of retarded fractional delay differential systems (RFDDSs) by the method of inequalities, in which the design problem is formulated so that it is suitable for solution by numerical methods. Zakian's original formulation, which was first proposed in connection with rational systems, is extended to the case of RFDDSs. In making the use of this formulation possible for RFDDSs, the associated stability problems are resolved by using the stability test and the numerical algorithm for computing the abscissa of stability recently developed by the authors. During the design process, the time responses are obtained by a known method for the numerical inversion of Laplace transforms. Two numerical examples are given, where fractional controllers are designed for a time-delay and a heat-conduction plants. © 2009 Institute of Automation, Chinese Academy of Sciences and Springer-Verlag GmbH.
6.
Silpsrikul, W; Arunsawatwong, S
Computation of peak output for inputs restricted in L 2 and L ∞ norms using finite difference schemes and convex optimization Journal Article
In: International Journal of Automation and Computing, vol. 6, no. 1, pp. 7-13, 2009, ISSN: 14768186, (cited By 5).
@article{Silpsrikul2009,
title = {Computation of peak output for inputs restricted in L 2 and L ∞ norms using finite difference schemes and convex optimization},
author = {W Silpsrikul and S Arunsawatwong},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-58549087547&doi=10.1007%2fs11633-009-0007-9&partnerID=40&md5=8c43edbe5884644832fd5efd961555ae},
doi = {10.1007/s11633-009-0007-9},
issn = {14768186},
year = {2009},
date = {2009-01-01},
journal = {International Journal of Automation and Computing},
volume = {6},
number = {1},
pages = {7-13},
abstract = {Control systems designed by the principle of matching gives rise to problems of evaluating the peak output. This paper proposes a practical method for computing the peak output of linear time-invariant and non-anticipative systems for a class of possible sets that are characterized with many bounding conditions on the two- and/or the infinity-norms of the inputs and their derivatives. The original infinite-dimensional convex optimization problem is approximated as a large-scale convex programme defined in a Euclidean space, which are associated with sparse matrices and thus can be solved efficiently in practice. The numerical results show that the method performs satisfactorily, and that using a possible set with many bounding conditions can help to reduce the design conservatism and thereby yield a better match. © 2009 Institute of Automation, Chinese Academy of Sciences and Springer-Verlag GmbH.},
note = {cited By 5},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Control systems designed by the principle of matching gives rise to problems of evaluating the peak output. This paper proposes a practical method for computing the peak output of linear time-invariant and non-anticipative systems for a class of possible sets that are characterized with many bounding conditions on the two- and/or the infinity-norms of the inputs and their derivatives. The original infinite-dimensional convex optimization problem is approximated as a large-scale convex programme defined in a Euclidean space, which are associated with sparse matrices and thus can be solved efficiently in practice. The numerical results show that the method performs satisfactorily, and that using a possible set with many bounding conditions can help to reduce the design conservatism and thereby yield a better match. © 2009 Institute of Automation, Chinese Academy of Sciences and Springer-Verlag GmbH.
7.
Arunsawatwong, S
Stability of Zakian IMN recursions for linear delay differential equations Journal Article
In: BIT Numerical Mathematics, vol. 38, no. 2, pp. 219-233, 1998, ISSN: 00063835, (cited By 11).
@article{Arunsawatwong1998,
title = {Stability of Zakian IMN recursions for linear delay differential equations},
author = {S Arunsawatwong},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0346968329&doi=10.1007%2fBF02512363&partnerID=40&md5=92fa3ddbfa26bc735c9e2e40ecb631d7},
doi = {10.1007/BF02512363},
issn = {00063835},
year = {1998},
date = {1998-01-01},
journal = {BIT Numerical Mathematics},
volume = {38},
number = {2},
pages = {219-233},
publisher = {Springer Netherlands},
abstract = {Long sequences of linear delay differential equations (DDEs) frequently occur in the design of control systems with delays using iterative-numerical methods, such as the method of inequalities. Zakian IMN recursions for DDEs are suitable for solving this class of problems, since they are reliable and provide results to the desired accuracy, economically even if the systems are stiff. This paper investigates the numerical stability property of the IMN recursions with respect to Barwell's concept of P-stability. The result shows that the recursions using full grade IMN approximants are P-stable if, and only if, N - 2 ≤ M ≤ N - 1.},
note = {cited By 11},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Long sequences of linear delay differential equations (DDEs) frequently occur in the design of control systems with delays using iterative-numerical methods, such as the method of inequalities. Zakian IMN recursions for DDEs are suitable for solving this class of problems, since they are reliable and provide results to the desired accuracy, economically even if the systems are stiff. This paper investigates the numerical stability property of the IMN recursions with respect to Barwell's concept of P-stability. The result shows that the recursions using full grade IMN approximants are P-stable if, and only if, N - 2 ≤ M ≤ N - 1.