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Robust Stability of Fractional Order Time-Delay Control Systems: A Graphical Approach

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  • Radek Matušů
  • Roman Prokop

Abstract

The paper deals with a graphical approach to investigation of robust stability for a feedback control loop with an uncertain fractional order time-delay plant and integer order or fractional order controller. Robust stability analysis is based on plotting the value sets for a suitable range of frequencies and subsequent verification of the zero exclusion condition fulfillment. The computational examples present the typical shapes of the value sets of a family of closed-loop characteristic quasipolynomials for a fractional order plant with uncertain gain, time constant, or time-delay term, respectively, and also for combined cases. Moreover, the practically oriented example focused on robust stability analysis of main irrigation canal pool controlled by either classical integer order PID or fractional order PI controller is included as well.

Suggested Citation

  • Radek Matušů & Roman Prokop, 2015. "Robust Stability of Fractional Order Time-Delay Control Systems: A Graphical Approach," Mathematical Problems in Engineering, Hindawi, vol. 2015, pages 1-9, September.
    • Handle: RePEc:hin:jnlmpe:847210
    DOI: 10.1155/2015/847210
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