Abstract
This paper aims at providing a framework for detection and diagnosis of the performance of a combinational feedforward (FF) and cascade (CC) control system. It is the extension of our previous work [1,2]. The main idea is to extract the only CC effect and the combination of FF with CC effects, respectively. In the only CC effect, the output variances of the primary and the secondary loops can be turned into the cascade-invariant and cascade-dependent terms, respectively. The combination of FF with CC effect can also be decomposed into the cascade/feedforward invariant term, the cascade-invariant/feedforward-dependent term and the cascade/feedforward dependent term. The diagnosis tree based on these decomposition terms is proposed to assess the performance of the FF/CC control system. The sequence of the statistical inference system is developed to diagnose fault causes. The capability of the proposed method is demonstrated via a cascade control system with the feedforward loops and multiple faults.
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References
Y. Yea and J. Chen, Ind. Eng. Chem. Res., 44, 5660 (2005).
Y. Yea and J. Chen, American control conference, Portland, Oregon (2005).
B. Huang and S. L. Shan, Performance assessment of control loops: theory and applications, Springer-Verlag; London (1999).
L. Desborough and T.J. Harris, Can. J. Chem. Eng., 70, 1186 (1992).
L. Desborough and T.J. Harris, Can. J. Chem. Eng., 71, 605 (1993).
B.-S. Ko, T.-F. Edgar and J. Lee, Korean J. Chem. Eng., 21, 1 (2004).
S. Lee, S. Yeom and K.-S. Lee, Korean J. Chem. Eng., 21, 575 (2004).
B.-S. Ko and T. F. Edgar, AIChE J., 46, 281 (2000).
J. Chen, S.-C. Huang and Y. Yea, J. Chem. Eng. Jpn., 38, 181 (2005).
N. Stanfelj, T. E. Marlin and J. F. Macgregor, Ind. Eng. Chem. Res., 32, 301 (1993).
N. F. Thornhill, J. W. Cox and M. A. Paulonis, Control Engineering Practice, 11, 1481 (2003).
W. X. Zheng and C. B. Feng, Automatica, 26, 769 (1990).
G. Jacovitti and G. Scarano, IEEE Trans. on Acoustics. Speech and Signal Processing, 41, 525 (1993).
D. M. Etter and S. D. Stearns, IEEE Transactions on ASSP, 29, 582 (1981).
D. C. Montgomery and G. C. Runger, Applied statistics and probability for engineers, 3rd Edition, John Wiley & Sons, Inc. (2003).
B.-S. Ko and T. F. Edgar, Assessment of achievable PI control performance for linear process with dead time, Proceedings of ACC, Philadelphia (1998).
C. B. Lynch and G. A. Dumount, IEEE Trans. on Control System Technology, 4, 185 (1996).
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Chen, J., Kong, CK. Controlled output variance based diagnosis tree for feedforward/cascade control systems. Korean J. Chem. Eng. 24, 379–390 (2007). https://doi.org/10.1007/s11814-007-0066-y
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DOI: https://doi.org/10.1007/s11814-007-0066-y