Anti-integral saturation control method and system of cascade control system

Abstract

The invention provides an anti-integral saturation control method of a cascade control system. The method comprises the following steps of: judging an anti-integral saturation direction according to input quantity and outputting logic judging quantity; delaying the output of the logic judging quantity; sending one part of the logic judging quantity output in a delayed way into a tracking condition pin of the cascade control system; selecting preset tracking quantity according to the other part of the logic judging quantity output in a delayed way; obtaining leading quantity; and sending the leading quantity and the selected tracking quantity into a tracking quantity pin of the cascade control system. The invention also provides an anti-integral saturation control system of the cascade control system; and by using the system, the integral saturation phenomenon in the industrial control process can be reduced and the adjusting quality of the industrial process control can be improved.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a cascade control system anti-integral windup control method and system. Background technique [0002] Many industrial process control objects have the characteristics of large inertia and large delay, and are one of the difficult objects to control. The cascade control is an effective control strategy for this kind of controlled objects. For this reason, in the field of industrial control, there are many loops that adopt cascade control. However, due to equipment selection, extreme working conditions and large external disturbances, cascade control loops often face the phenomenon of integral saturation. After integral saturation occurs in the cascade control loop, the adjustment speed of the control system will be further reduced, and the adjustment quality will drop sharply. At present, especially the integral saturation phenomenon of the outer loop of the cascade control c...

AI Technical Summary

Problems solved by technology

At present, especially the integral saturation phenomenon of the outer loop of the cascade control cannot be directly solved in the PID function block of the existing control configuration software

[0003] The following problems exist in the current cascade control loop for anti-integral windup: 1) In the entire cascade loop design and configuration process, the loop has not been designed with the function of anti-integral windup

2) Even if the PID function module has the function of anti-integral saturation, it only prevents the occurrence of integral saturation in the inner loop, but the cascaded outer loop still cannot get rid of the trouble of integral saturation

On the one hand, this method fails to completely and scientifically solve the phenomenon of integral saturation of cascade control loops. At the same time, manual loops may lead to manual switching of process control in other processes, which is not conducive to the stability of the entire production process and affects the adjustment quality of industrial process control.

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