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Stability Preservation Problem in Methods Finding Rational Approximation of Fractional order Systems

Mohammad Saleh Tavazoei, Milad Siami, Sadegh Bolouki
This paper deals with stability preservation issue in methods which present an integer order model as an approximation of a fractional order system. First, the stability region of the approximating model obtained in these methods is determined and compared with the stability region of the original system. Then, one of the popular methods in this category (Charef method) is studied from the stability preservation point of view.
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