A Design of Deadbeat Digital Controller with Seris Compensation and Local Feedback

Abstract

In this paper, we propose a time domain design of the deadbeat digital controller with series compensation of the integral-action and local feedback compensation. It is proved that the control system proposed here gives the deadbeat response not only for the step change of the desired value but also the disturbance, and the simulation result makes the fact clear.
The dynamic characteristic of the process is expressed by the step or impulse response, then the sequence of the control signal which makes deadbeat response can be easily obtained by the matrix computation, using sampled data of these responses. The designing method of the integral-action gain constant and feedback compensator is derived by using the sequence of the control signal.
This method is very simple comparing with other methods which use the pulse transfer function or state equation, and can be systematically applied to the system including the lag time or the restriction of the manipulated variable.