A Study on the Performance Improvement of Two-degree of Freedom PI Controller using $H_{\infty}$ Technique

$H_{\infty}$ 기법을 이용한 2자유도 PI 제어기 성능개선에 관한 연구

In the conventional $H_2$ design of PI controllers, the quadratic cost function includes only the plant output term and hence, the optimal controller often results in a very large plant input. In this paper, $H_{\infty}$ design methodology is combined with the conventional $H_2$ design to make a trade-off between the regulation of the plant input and the plant output in a systematic way.