TITLE

Simultaneous relay auto tuning of parallel cascade controllers

AUTHOR(S)
Vivek, Sathe; Chidambaram, M.
PUB. DATE
June 2007
SOURCE
Chemical Business;Jun2007, Vol. 21 Issue 6, p45
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
The present work is concerned with relay auto tuning of parallel cascade controllers. Traditionally, auto tuning procedures for cascade controllers are applied using a sequential, one-loop-at-a-time method. Recently Saraf and Bequette [1] have proposed a simultaneous method of relay tuning of series cascade control system. In the present work, their method is applied to a parallel cascade control system. In the method of Saraf and Bequette [1], they have assumed the principle harmonic analysis of relay oscillations. This results in error in calculation of ultimate gains. In the present work, the method of Srinivasan and Chidambaram [2] proposed for a single loop stable system is extended to get more accurate values of the controller ultimate gains. Using improved ultimate gains; the inner loop (PI) and outer loop (PID) controllers are designed by Ziegler-Nichols tuning method. The improved performance of the proposed parallel cascade control is compared with that of the Saraf and Bequette method.
ACCESSION #
27330291

 

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