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In this paper a new method is proposed for calculation of all stabilizing PI controllers for coupled tank Multi-Input Multi-Output (MIMO) process. By plotting the stability boundary locus in the (kp, ki) plane for coupled tank multivariable process after applying the decoupling technique, the stabilizing PI controller parameters are computed. The technique proposed does not require sweeping over the parameters and also does not need linear programming t o solve set of inequalities. This method is also used to obtain the all stabilizing PI controllers which achieve user specified gain and phase margins.
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