Fractional order disturbance observer based robust control

Control under heavy uncertain conditions is one of the most important control problems in integer as well as fractional order systems. This paper investigates a fractional order disturbance observer based on full state information. This work is the extension of integer order disturbance observer in [1] to fractional domain. An extra compensator based on estimated disturbance is added to the classical state feedback control. Effectiveness of the proposed scheme is illustrated by simulation results.