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Zbl 1189.93125
Hamamci, Serdar Ethem; Koksal, Muhammet
Calculation of all stabilizing fractional-order PD controllers for integrating time delay systems.
(English)
[J] Comput. Math. Appl. 59, No. 5, 1621-1629 (2010). ISSN 0898-1221

Summary: A simple and effective stabilization method for integrating time delay systems using fractional order PD controllers $C(s)=kp+kds\mu$ is proposed. The presented method is based on finding the stability regions according to the fractional orders of the derivative element in the range of (0, 2). These regions are computed by using three stability boundaries: Real Root Boundary (RRB), Complex Root Boundary (CRB) and Infinite Root Boundary (IRB). The method gives the explicit formulae corresponding to these boundaries in terms of fractional order PD controller ($PD^\mu$ controller) parameters. Thus, the complete set of stabilizing controllers for an arbitrary integrating time delay system can be obtained. In order to demonstrate the effectiveness in solution accuracy and the simplicity of this method, two simulation studies are given. The simulation results indicate that the $PD^\mu$ controllers can provide larger stability regions than the integer order PD controllers.
MSC 2000:
*93D15 Stabilization of systems by feedback
93B51 Design techniques in systems theory

Keywords: fractional-order control; PD controllers; integrating systems; time delay; stabilization

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