Undershoot Reduction for Plants with Real Unstable Zeros by Time-Varying Controller Design

• Hadary Ferry

  Kyushu Institute of Technology, Department of Control Systems Engineering and Science

• Ohkawa Fujio

  Kyushu Institute of Technology, Department of Control Systems Engineering and Science

Abstract

It is well known that undershoot phenomena are inevitable for plants having real unstable zeros. In this paper, we first investigate the undershoot phenomena caused by real ustable zeros of the plant to be controlled theoretically. We then propose methods of reducing the undershoot amount for a plant with real unstable zeros. The ideas are an introduction of exponential decay factor in the performance index in optimal LQR, and time-varying controller (digital control) with piecewise constant hold, where in this design enables us to change the inter-sample control input. We can confirm the effectiveness by simulations.

Journal

• IEEJ Transactions on Electronics, Information and Systems

  IEEJ Transactions on Electronics, Information and Systems 126 (7), 883-887, 2006

  The Institute of Electrical Engineers of Japan

Keywords

• undershoot
• digital control
• piecewise constant hold

Details

• CRID: 1390001204605950336
• NII Article ID: 10018146534
• NII Book ID: AN10065950
• DOI: 10.1541/ieejeiss.126.883
• ISSN: 13488155
• ISSN: 03854221
• NDL BIB ID: 8022592
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8022592
• Web Site: http://www.jstage.jst.go.jp/article/ieejeiss/126/7/126_7_883/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed