Simultaneous relay auto tuning of parallel cascade controllers

Vivek, Sathe; Chidambaram, M.
June 2007
Chemical Business;Jun2007, Vol. 21 Issue 6, p45
Trade Publication
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.


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