Robust Coordinated Control of Hot Strip Mill Multivariable System

Hot strip mill is a typical process with high accuracy and high speed. The effective approach to enhance the products competitiveness is to improve the quality and quantity by means of advanced control strategy. A multivariable system comprised of gauge and mass flow of hot strip mill is analyzed in the article. A state-space model about the gauge and mass flow for one stand and inter-stand in a hot strip mill is set up as well. New steady and coordinated control approach on the basis of LQG and H-infinity of hot strip mill is proposed and the robust characteristics such as perfect robust stabilization, strong disturbance attenuation and coordination properties are better in the latter. Simulation results show the validity of analysis, design and control.