Active Disturbance Rejection Control Based On Fractional-Order Calculus

In recent years with the development of fractional theory research, fractional order calculus is becoming a new hotspot. Fractional order controller parameter tuning method can not only improve the system dynamic response characteristics,But also can get better than the traditional PID controller parameter tuning method of robust ability and disturbance rejection.Promoting fractional controller applied to real-time control system.Fractional controller compares with integer order PID, increases the integral order l and the differentialm,Enhance the flexibility of the controller.Based on fractional orderPIλDμ calculus controller, this paper embeds the active disturbance rejection control to design new fractional calculus active disturbance rejection control, integrates the transitional arrangements, ESO and nonlinear state error feedback in the active disturbance rejection control with fractional order control system. New fractional order active disturbance rejection control structure inherits the strengths of traditional PIC control, combines with the flexibility of fractional order calculus and inhibition and strong stability of active disturbance rejection control, and the controller will still have better stability when there is unknown disturbances in the controller. Fractional orderPIλDμ controller extends the adjustable parameters of conventional PID controller, in order achieve better control performance and show rapidness and precision control performance. Active disturbance rejection control has won more and more attention because of its simple algorithm,easy implementation, high precision, and strong robustness. Based on active disturbance rejection control structure, active disturbance rejection control effect can achieve the expected response through the system simulation. This paper applies the fractional active disturbance rejection control to the servo system, establishes the servo system function model, analyzes the disturbance characteristics, combines with the actual target requirement, and optimize land m parameters over the ESO. Simulation results show that compared with the traditional controller and the controller with separate effect, fractional active disturbance rejection control can improve the system performance in the control effect, and thus confirm the validity and superiority of the method.