WSEAS Transactions on Systems and Control
Print ISSN: 1991-8763, E-ISSN: 2224-2856
Volume 10, 2015
Design of Predictive Fractional Order PI Controller for the Quadruple Tank Process
Authors: ,
Abstract: Industrial processes are usually higher order processes and hence the effect of dead time is one of the important problems which may make the system unstable. Various control strategies have been introduced for the system with large dead time. Predictive PI control is one of the compensation technique which is a modified form of smith predictor algorithm. Introducing the concept of fractional order controller (in which the integrator and differentiator are of fractional order) in predictive control strategy the benefits of both can be derived. In this paper an attempt is made to design and analyze the scheme to compensate the effect of dead time present in a process through predictive fractional order PI controller. The Quadruple tank process taken to study the performance of the control strategy is a MIMO process which includes positive zero in its characteristics. The experimental model considered in this work is with large dead time. Therefore it is a challenging job to develop a control strategy for performance improvement. The performance of the process with developed scheme is evaluated using settling time, rise time, peak time, overshoot and ISE through simulation. Hagglund, Gainshaping, Amigo and Z-N tuning techniques are used to tune PI controller.
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Keywords: Predictive PI Controller, Fractional Order Controller, Hagglund, Gainshaping, Amigo, Z-N, Quadruple tank process
Pages: 85-94
WSEAS Transactions on Systems and Control, ISSN / E-ISSN: 1991-8763 / 2224-2856, Volume 10, 2015, Art. #10