Original scientific paper

Sliding Mode Controller For Unstable Systems

S. Sivaramakrishnan ; Department of Chemical Engineering, Indian Institute of Technology, Madras Chennai 600036, India
Arun Tangirala ; Department of Chemical Engineering, Indian Institute of Technology, Madras Chennai 600036, India
M. Chidambaram ; Department of Chemical Engineering, Indian Institute of Technology, Madras Chennai 600036, India

Abstract

The method proposed by Rojas et al.1 for the design of sliding mode controllers (SMC) for un-stable first order plus time delay systems, is extended for delay-time constant ratio () up to 1.8. The SMC settings obtained for various  are fitted by simple equations. Up to  = 1.2, the method is found to be more robust than that of latest PID Controller proposed by Padmasree et al.2 There is no method available in literature to stabilize unstable systems using PID controller for  > 1.2. Simulation results are also given for a nonlinear bioreactor control problem

Keywords

Sliding Mode Control; First Order plus Time Delay Systems (FOPDT); Unstable Systems

Hrčak ID:

21396

URI

https://hrcak.srce.hr/21396

Publication date:

28.3.2008.

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