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Application of Robust H∞ Technique to Control Water Level of Boiler Drum in the Presence of Parametric Uncertainties

[+] Author Affiliations
Hamed Moradi, Majid Saffar-Avval, Firooz Bakhtiari-Nejad

Amirkabir University of Technology, Tehran, Iran

Paper No. IMECE2010-38064, pp. 61-67; 7 pages
doi:10.1115/IMECE2010-38064
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 8: Dynamic Systems and Control, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4445-8
  • Copyright © 2010 by ASME

abstract

Poor control of drum water level is one the reasons for emergency shutdowns in power plants. To overcome uncertain disturbances affecting water level of drum, a robust controller must be designed. In this paper, a linear time invariant (LTI) model of the boiler system associated with parametric uncertainties is considered. The input variables are feed-water and steam mass rates while the output variable is drum water level. Parametric uncertainties are modeled in the frequency domain as a disc type template. General control configuration is presented to model the uncertain system with unstructured uncertainty in the form of multiplicative input uncertainty. Only nominal performance is achieved for perturbed plants using μ-analysis with applying an inversed-base controller. However, since the robust stability and performance are not satisfied, desired responses can not be obtained. To overcome this problem, an optimal robust controller is designed based on μ-synthesis with DK-iteration algorithm which satisfies the constraints of control signals too.

Copyright © 2010 by ASME
Topics: Boilers , Water

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