An Effective Approach of Approximation of Fractional Order System using Real Interpolation Method

Fractional-order controllers are recognized to guarantee better closed-loop performance and robustness than conventional integerorder controllers. However, fractional-order transfer functions make time, frequency domain analysis and simulation signi cantly di cult. In practice, the popular way to overcome these difculties is linearization of the fractional-order system. Here, a systematic approach is proposed for linearizing the transfer function of fractionalorder systems. This approach is based on the real interpolation method (RIM) to approximate fractional-order transfer function (FOTF) by rational-order transfer function. The proposed method is implemented and compared to CFE high-frequency method; Carlson's method; Matsuda's method; Chare 's method; Oustaloup's method; least-squares, frequency interpolation method (FIM). The results of comparison show that, the method is simple, computationally efcient, exible, and more accurate in time domain than the above considered methods.