Inlet tension feed forward compensation method and system adopting monitoring automatic gauge control (AGC)

Abstract

The invention provides an inlet tension feed forward compensation method adopting monitoring automatic gauge control (AGC). The strip steel outlet gauge differences are sampled continuously during rolling, and the average value of the strip steel outlet gauge differences sampled at the current moment and the moment of the former N<2>-1 time is worked out. The outlet gauge different average value is smoothened by using a first-order lag link. The monitoring AGC speed compensation amount in a sampling cycle is worked out. The monitoring AGC speed compensation amount is obtained by using an integral controller. The speed compensation amount is converted into an acceleration compensation amount by using a differential link. The acceleration compensation amount is smoothened by using the first-order lag link and subjected to amplitude limiting to be converted into the acceleration torque compensation amount of an inlet recoiling machine, the torque compensation amount is provided to a transmission control unit of the inlet recoiling machine, the torque of the inlet recoiling machine is controlled by the transmission control unit, and then the inlet tension can be subjected to feed forward compensation during monitoring AGC enabling. According to the inlet tension feed forward compensation method and system adopting monitoring AGC, the strong coupling relationship between monitoringAGC and inlet tension control is weakened, the accuracy of overall AGC and tension control is improved, and the yield is improved.

Description

technical field [0001] The invention belongs to the field of rolling mill control, and in particular relates to a feedforward compensation method and system for monitoring thickness control and inlet tension. Background technique [0002] The cold rolling mill is a process in which the uncoiler, steering roll, rolling mill frame and coiler are all mechanically connected into a whole through the rolled strip to form a tension rolling process. Therefore, rolling tension is a very important parameter in the strip production process and must be strictly controlled. At the same time, strip thickness is the most important indicator of product quality, so thickness control and tension control systems are indispensable and important components in the electronic control system of modern cold rolling mills. [0003] The thickness control system of a single-stand reversing cold rolling mill generally includes three automatic gauge control methods: feedforward, second flow, and monitor...

AI Technical Summary

Problems solved by technology

Obviously, there is a strong coupling relationship between thickness control and tension control. If no compensation is made, the out-of-tolerance length of the strip will be greatly increased, and the product yield will decrease, resulting in great waste and cost increase.

[0008] At present, the decoupling control methods of rolling mill thickness and tension are mostly concentrated on theoretical research, and some literatures use intelligent decoupling control methods, such as recurrent neural network, multivariable robust decoupling control, etc. Most of the papers are proved by simulation experiments its effectiveness, however, considering the complexity of these intelligent decoupling algorithms, it is difficult to apply in practice

There is also a diagonal matrix decoupling control method to solve this problem, and it has been used on some units, but this method requires a more accurate system transfer function model, and the actual complex system is often time-varying nonlinear, this method The control accuracy will be greatly affected

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