Takagi—Sugeno Observers as an Alternative to Nonlinear Observers for Analytical Redundancy. Application to a Steam Generator of a Thermal Power Plant
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Two observer design approaches for analytical redundancy are presented in this work. The first one is based on the use of Takagi—Sugeno observers, whereas the second method is based on nonlinear high-gain observers. The objective is to conduct a comparative study between these two different approaches for a posteriori application of monitoring process and/or fault detection. In order to ensure a fair comparison, both approaches are evaluated on a common case study: the estimation of critical variables in a steam generator for thermal power plants. A well-known simplified nonlinear model for the steam generator proposed by Bell and Åstrom is used for the high-gain observer design whereas for the Takagi—Sugeno obsever design, the nonlinear model is transformed into a Takagi—Sugeno form by means of the nonlinear sector approach. The main contribution is to propose the use of Takagi—Sugeno observers for analytical redundancy purposes and to highlight their advantages over the use nonlinear high-gain observers.
KeywordsAnalytical redundancy High-gain observer Takagi—Sugeno observer Steam generator
The authors acknowledge CONACYT for supporting Jesús Reyes-Martínez through a Ph.D. Scholarship.
- 4.Bell, R.D., Åström, K.J.: Dynamic models for boiler-turbine-alternator units: data logs and parameter estimation for a 160 MW unit. Tech. rep., Department of Automatic Control. Lund Institute of Technology (1987)Google Scholar
- 11.Dukelow, S.G.: The Control of Boilers, 2nd edn. Instrument Society of America, Pittsburgh, PA (1991)Google Scholar
- 28.Téllez-Anguiano, A.C., Astorga-Zaragoza, C.M., Escobar, R.F., Alcorta-García, E., Juárez-Romero, D.: Continuous-discrete observer-based fault detection and isolation system for distillation columns using a binary mixture. Revista Mexicana de Ingeniería Química 15(1), 275–290 (2016)Google Scholar
- 29.Téllez-Anguiano, A.C., Astorga-Zaragoza, C.M., Targui, B., Aguilera-González, A., Reyes-Reyes, J., Adam-Medina, M.: Experimental validation of a high-gain observer for composition estimation in an ethanol-water distillation column. Asia-Pacific J. Chem. Eng. 4(6), 942–952 (2009)CrossRefGoogle Scholar