Higher-order derivative compensators as a better alternative to PID in controlling the systems with higher dynamics

Nazim Mir-Nasiri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The paper introduces the design and computer simulation of the new PD N controller. It is suggested as an alternative to the traditional PID controller The PID is still popular as an industrial process controller. PDN controller is as simple as PID but it is more effective when dealing with higher-order dynamic systems. Its higher-order derivative gains/compensators (KN, KN-1,⋯, K1, K0) are able to improve transient performance of the system. In other words, they are able to directly control values of higher-order dynamic components of the system under control. The compensators urge the system to be stabile and respond much faster than in case of using PID controller. One of the components of the PDN controller is a tunable command feed-forward steady state gain (KS) that forces the system to attain the selected set point value or track the selected time varying input command. It helps to track the input commands much faster and more precisely than it could be achieved by using the integral component of the PID controller. The theory in the paper covers the steady state performance, stability issues, and the controller gains tuning strategies to improve the transient responses of the feedback system. The advantages of the PDN controller are thoroughly analyzed and demonstrated by solving the set point input (step) and the tracking a time varying input (ramp) problems. The paper also presents the detailed instructions for selecting and tuning the higher-order derivative compensators of PDN controller for the general case of unknown order stable/unstable plant and particular case of unknown order but stable plant.

Original languageEnglish
Title of host publicationProceedings of the 11th IASTED International Conference on Control and Applications, CA 2009
Pages172-178
Number of pages7
Publication statusPublished - Dec 1 2009
Event11th IASTED International Conference on Control and Applications, CA 2009 - Cambridge, United Kingdom
Duration: Jul 13 2009Jul 15 2009

Publication series

NameProceedings of the 11th IASTED International Conference on Control and Applications, CA 2009

Other

Other11th IASTED International Conference on Control and Applications, CA 2009
CountryUnited Kingdom
CityCambridge
Period7/13/097/15/09

Keywords

  • Derivative compensators
  • Stability
  • Steady-state
  • Transient
  • Tuning rules

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Computer Science Applications
  • Human-Computer Interaction
  • Control and Systems Engineering

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