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Improved PID controller design for unstable time delay processes based on direct synthesis method and maximum sensitivity

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  • B. Vanavil
  • K. Krishna Chaitanya
  • A. Seshagiri Rao

Abstract

In this paper, a proportional-integral-derivative controller in series with a lead-lag filter is designed for control of the open-loop unstable processes with time delay based on direct synthesis method. Study of the performance of the designed controllers has been carried out on various unstable processes. Set-point weighting is considered to reduce the undesirable overshoot. The proposed scheme consists of only one tuning parameter, and systematic guidelines are provided for selection of the tuning parameter based on the peak value of the sensitivity function (Ms). Robustness analysis has been carried out based on sensitivity and complementary sensitivity functions. Nominal and robust control performances are achieved with the proposed method and improved closed-loop performances are obtained when compared to the recently reported methods in the literature.

Suggested Citation

  • B. Vanavil & K. Krishna Chaitanya & A. Seshagiri Rao, 2015. "Improved PID controller design for unstable time delay processes based on direct synthesis method and maximum sensitivity," International Journal of Systems Science, Taylor & Francis Journals, vol. 46(8), pages 1349-1366, June.
    • Handle: RePEc:taf:tsysxx:v:46:y:2015:i:8:p:1349-1366
    DOI: 10.1080/00207721.2013.822124
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    References listed on IDEAS

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    1. Mingwei Sun & Ruiguang Yang & Zenghui Wang & Zengqiang Chen, 2013. "Stability margin-based PD attitude control tuning for unstable flight vehicle," International Journal of Systems Science, Taylor & Francis Journals, vol. 44(2), pages 240-251.
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