The Arithmetic Research Of AGC Systems Of Cold Rolling Mill And Its Development In PLC

The accuracy of the strip gauge is one of quality targets of strip production. With the development of social economy, the accuracy of the strip is more higher. This make lots of cold rolling mills being drop behind, and the renovation is necessary. The paper explicate the operation principle, hardware and software configuration, function assignment, data flow and application program structure of the AGC systems with Simatic S7 400 PLC, in Handan Yasheng cold rolling mill.Because of effect of machinery system, control system of roll and change of strip gauge and differences of two sides pressing down system of rolling mill, the system has a lot of uncertainty, which made it not easy to attain control effect by means of general PID control method. So the paper researches the principles and process principle of rolling mill, analyses and synthesize dynamic mathematical model of AGC. In view of the uncertainty and distribution of system, the paper presents that theμmethod which does not demand high precision of the structure, parameter, hysteresis, stability and so on is applied to AGC based on H_∞control in this paper, so it has good control effect for inner loop of system and overall system, especially hysteresis.Simulations of experiment indicate that theμcontrol method has characteristic of clarity concision design and solve process; it also has good system performance and robust stability performance.