A Simple Method to Design Robust Fractional-order Lead Compensator

This paper proposes a generalized and simple analytical method to design robust fractional-order lead compensator (FOLC). The aim of the proposed fractional-order compensator is to adjust the system's Bode phase curve to achieve the required phase margin at a specified frequency. The structure selected in this paper is more generalized and novel. It is easy to implement for a real world application. The method proposed is frequency domain and parameters of fractional compensator are selected from the plant information and specifications. This FOLC satisfies the specifications on static error constant, K-SS, gain crossover frequency, omega(c) and phase margin, phi(m). The applicability of the proposed method is demonstrated with illustrative examples. From the simulation results obtained, it is observed that FOLC gives robust and stable performance as compared to existing FOLC and integer order lead compensator (IOLC).