Design of Controller for Stock Consistency Control using H-Infinity Mixed Sensitivity Approach

This paper presents design and analysis of a robust control methodology based on H-infinity mixed sensitivity approach. The designed controller has been implemented on stock consistency (an important parameter of paper machine headbox). The paper also describes the results obtained for stock consistency model with conventional PID controller using IMC, ZN and TL tuning methods. The performance assessment of H-infinity controller has been done by comparing its results with conventional PID controller. The assessment is done on the basis of four major aspects such as: Time response, relative stability, performance index and robustness.