MULTIVARIABLE CONTROL OF AN INDUSTRIAL BOILER-TURBINE UNIT WITH NONLINEAR MODEL: A COMPARISON BETWEEN GAIN SCHEDULING & FEEDBACK LINEARIZATION APPROACHES

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MORADI H.; ALASTY A.; SAFFAR AVVAL M.; BAKHTIARI NEJAD F.

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Journal Paper

Paper Information

Journal: Scientia Iranica Year:2013 | Volume:20 | Issue:5 (TRANSACTIONS B: MECHANICAL ENGINEERING) Page(s): 1485-1498

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Title

MULTIVARIABLE CONTROL OF AN INDUSTRIAL BOILER-TURBINE UNIT WITH NONLINEAR MODEL: A COMPARISON BETWEEN GAIN SCHEDULING & FEEDBACK LINEARIZATION APPROACHES

Author(s)

MORADI H. | ALASTY A. | SAFFAR AVVAL M. | BAKHTIARI NEJAD F. | Issue Writer Certificate

Keywords

BOILER-TURBINE

NONLINEAR MODEL

MULTIVARIABLE CONTROL

GAIN SCHEDULING

FEEDBACK LINEARIZATION

Abstract

Due to demands for the economical operations of power plants and environmental awareness, performance control of a BOILER-TURBINE unit is of great importance. In this paper, a nonlinear multi input-multi output model (MIMO) of a utility BOILER-TURBINE unit is considered. Drum pressure, generator electric output and drum water level (as the output variables) are controlled by manipulation of valves position for fuel, feed-water and steam flows. After state space representation of the problem, two controllers based on GAIN SCHEDULING and FEEDBACK LINEARIZATION are designed. Tracking performance of the system is investigated and discussed for three cases of ‘near’, ‘far’ and ‘so far’ set-points. According to the results obtained, using FEEDBACK LINEARIZATION approach leads to the more quick time responses with a bit more overshoots (in comparison with the GAIN SCHEDULING method). In addition, in FEEDBACK LINEARIZATION strategy, input control signals (valves position) actuate in less time with less oscillations. It is observed that in the presence of an arbitrary random uncertainty in model parameters, the controller designed based on FEEDBACK LINEARIZATION is more robust. Finally, according to the phase portraits of the problem, as the desired speed of tracking process is increased, dynamic system tends to demonstrate a chaotic behaviour.

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APA: Copy

MORADI, H., ALASTY, A., SAFFAR AVVAL, M., & BAKHTIARI NEJAD, F.. (2013). MULTIVARIABLE CONTROL OF AN INDUSTRIAL BOILER-TURBINE UNIT WITH NONLINEAR MODEL: A COMPARISON BETWEEN GAIN SCHEDULING & FEEDBACK LINEARIZATION APPROACHES. SCIENTIA IRANICA, 20(5 (TRANSACTIONS B: MECHANICAL ENGINEERING)), 1485-1498. SID. https://sid.ir/paper/290131/en

Vancouver: Copy

MORADI H., ALASTY A., SAFFAR AVVAL M., BAKHTIARI NEJAD F.. MULTIVARIABLE CONTROL OF AN INDUSTRIAL BOILER-TURBINE UNIT WITH NONLINEAR MODEL: A COMPARISON BETWEEN GAIN SCHEDULING & FEEDBACK LINEARIZATION APPROACHES. SCIENTIA IRANICA[Internet]. 2013;20(5 (TRANSACTIONS B: MECHANICAL ENGINEERING)):1485-1498. Available from: https://sid.ir/paper/290131/en

IEEE: Copy

H. MORADI, A. ALASTY, M. SAFFAR AVVAL, and F. BAKHTIARI NEJAD, “MULTIVARIABLE CONTROL OF AN INDUSTRIAL BOILER-TURBINE UNIT WITH NONLINEAR MODEL: A COMPARISON BETWEEN GAIN SCHEDULING & FEEDBACK LINEARIZATION APPROACHES,” SCIENTIA IRANICA, vol. 20, no. 5 (TRANSACTIONS B: MECHANICAL ENGINEERING), pp. 1485–1498, 2013, [Online]. Available: https://sid.ir/paper/290131/en

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