PI control loop performance evaluation method with controller output constraint

Abstract

The invention discloses a PI control loop performance evaluation method with the controller output constraint. In a control loop, the controller output difference constraint is introduced to limit the variation of a controlled object. Meanwhile, the fluctuation frequency and the fluctuation range of the controlled object are limited by restraining the output difference of a controller, so that the controlled object does not fluctuate violently. Meanwhile, the output difference of the loop is as small as possible, so that the interference of the external disturbance to the loop is reduced. According to the technical scheme of the invention, the optimization range of PI parameters is gradually expanded, and the region is gradually enlarged. A minimum output difference is found in the defined region. In this way, found PI parameters can be guaranteed to have good application prospect in the minimum output difference performance evaluation. Meanwhile, the optimization result is ensured not to enable the output variation of the controller to be too large. As a result, two optimization targets can be taken into consideration at the same time, and a powerful guarantee is provided for the efficient, green and low-energy-consumption production of enterprises.

Description

technical field [0001] The invention relates to PI parameter optimization in a control loop, in particular to a method for evaluating the performance of a PI control loop with controller output constraints. Background technique [0002] In the industrial process loop, the noise disturbance at the output end will affect the actual output of the system, resulting in output deviation. If the deviation is too large, the system will be unstable or have a large difference from the actual plan of industrial production, which will seriously restrict the production of the enterprise. and economic benefits. In the process loop, the PI controller is the most widely used. Compared with the PID controller, it has a simpler structure and has the advantages of easy operation. Therefore, it is widely used in industrial production processes. However, how to set the parameters of the PI controller The influence of the setting on the control loop is very significant. Most of the existing PID...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of unstable control loop, serious noise at the output end of the control loop, and large output variance of the control loop, the present invention proposes a PI control loop performance evaluation method with controller output constraints, aiming at calculating the minimum output of the loop variance so as to evaluate the performance of the control loop, and finally give the parameters kp, ki of the PI controller

Images