Fractional-order PID controller tuning based on genetic algorithm

Because the fractional-order systems model is complex and the fractional-order controller requires more tuning parameters than that of integer-order controller, the tuning parameters method of fractional-order PI
^λ
D
^μ
controller is difficult to obtain. In order to improve the accuracy of fractional-order PI
^λ
D
^μ
controller, the character and the designing method of fractional-order PID controller is analyzed in this paper, and the genetic algorithm is introduced to the design of fractional-order
^λ
D
^μ
controller. By using the genetic algorithm to optimize the corresponding parameters, a better PID controller which has a superior is obtained, the error of fractional-order PID controller is avoided and the tuning efficiency is improved. The results of simulation show that the controlling effect of the fractional-order
^λ
D
^μ
controller is better than that of the integer-order PID controller.