The control loop PID parameter automatic tuning system refers to adjusting the PID controller parameters (proportional coefficient KP, integral time TI, differential time TD) when the controller law has been determined to be in the form of PID, so that the controlled object, control The dynamic characteristics of the control loop composed of the controller, etc. It can meet the expected index requirements and achieve the ideal control effect. A good PID controller parameter tuning method can not only reduce the operator's burden, but also make the control system in the best operating state.

In the field of industrial process control, a simple PID problem can solve 90% of the control problems. However, in the actual implementation process, the working efficiency of the control parameters will not be corrected in real time. Parameter values have to be readjusted only if there is a problem with the control system. Therefore, many industrial field control systems are in a "non-optimal" working state, or even improperly set, which seriously affects the control quality of the control system.

On the basis of the parameter setting of the PID control loop, all control loops can be switched back to the "automatic" mode, so that the production line is in a stable control state. However, for complex control systems, it is impossible to obtain satisfactory performance output only by PID parameter arrangement. At this time, in order to further improve the automation level of the factory, it is recommended that users continue to implement the APC advanced process control system.

On the premise of fully understanding the current situation and control objectives of the production plant, the company's technical experts can provide a targeted integrated advanced control solution (Omni APC), and propose the rectification of the basic control system and equipment required for the implementation of the solution. necessary advice. The main goal of the whole system is to realize advanced control of the device, optimize and monitor the control loop in the DCS system, and improve the performance of the loop on this basis, so as to ensure the investment of the enterprise in the control system, It enables the device continue to function throughout its life cycle, making a greater contribution to the increased economic benefits of the device.

It is very difficult fot the application of predictive control technology, and the model identification part is the most difficult and time-consuming task. In the newly put into operation predictive control project, the model identification workload accounts for more than 50%. The APC scheme adopts a multi-variable closed-loop identification method, which can reduce the identification time by 70% and achieve fully automatic online identification. Based on the online identifier, a new generation of adaptive predictive control controller is developed. The technology integrates an online identifier and a predictive control controller, uses closed-loop/open-loop identification, and automatically generates a model during the identification experiment. When the accuracy of a certain model reaches the standard, it is automatically used by the APC controller. The adaptive predictive control can increase the efficiency of predictive control projects by 200% and greatly reduce engineering difficulty.