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Robustness Margins Separating Process Dynamics Uncertainties

Author

Summary, in English

In controller design, not only set-point tracking and disturbance rejection can be considered, also robustness towards process uncertainties is a key issue. In this paper, new robustness measures that divide uncertainties into dead time and non-dead time uncertainties, are presented. It is shown, to

the contrary of classic measures such as phase/gain/dead time margins, to guarantee stability towards simultaneous process changes, but at the same time being more flexible and less conservative than the robust control framework. The measures depend on extended sensitivity functions and are well illustrated in a Nyquist diagram giving valuable insight. Procedures to

calculate the robustness margins are presented and examples are given.

Publishing year

2009

Language

English

Document type

Conference paper

Topic

  • Control Engineering

Keywords

  • Robustness
  • Time Delay
  • Uncertain systems
  • Stability

Conference name

European Control Conference, 2009

Conference date

2009-08-23 - 2009-08-26

Conference place

Budapest, Hungary

Status

Published

Project

  • PID Control

Research group

  • LCCC