Decentralized robust decoupling control for looper tension and height system

For the coupling problems of looper tension and height control system of hot continuous rolling mil l, a robust control strategy based on decentralized control method was proposed. The integrated model of looper tension and height control system was established firstly. The looper height and tension control system was regarded as two independent systems, and the coupling between each other was regarded as disturbance, then the controller of each sub-system was designed independently. In order to solve the problem of model uncertainty of each sub-system and disturbance of coupling, a robust controller using H-infinity mixed sensitivity performance indicators was designed. This control was able to ensure the anti-disturbance performance and overcome the shortcomings of traditional looper control system. Simulation results show the effectiveness of the algorithm and the better control effect of the looper control system after decoupling.