Abstract
A controller design technique for periodic disturbance rejection is proposed. The form of the controller has a free parameter transfer function similar to the Youla parametrization, and it enables to separate the general property of sensitivity function of closed loop system and detailed design of the periodic disturbance rejection performance. A design method of the parameter function is given using the solution of the model matching problem. Numerical examples of the sensitivity function for the mold level control of continuous caster shows the flexibility of the design. The performance of the disturbance rejection is shown by simulation results of mold level control and an experimental result.
