Disturbance Suppressed Deadbeat Control by Two-Degree-of-Feedom Compensation Scheme

Abstract

In this paper we present a practical design method for SISO dead-beat control systems based on two-degree-of-freedom compensation scheme. We aim to design the control system satisfying the following specifications: (1) For reference input, the output is settled in finite steps, then the output error before the settling time and the input are controlled optimally. (2) For disturbance, the output is settled to zero in finite steps, then the output error before the settling time and the input are controlled optimally. (3) The disturbance is assumed to be added to the input as well as to the output. (4) The output is ripple-free after the settling time. The designed system turns out to be a disturbance suppressed ripple-free dead-beat control system with transient responses of input and output considered. The design problem is reduced to the linear optimization problem with respect to the parameters yielded by increasing the settling time and the solution is easily obtained.