pid performance evaluation method

Abstract

The invention provides a PID performance evaluation method, belonging to the field of automation control. The method comprises the step of obtaining the production data and data quality code of a control loop, processing the production data according to the data quality code to obtain a processed production data sequence, combined with a preset process model, obtaining an updated response time, obtaining a performance evaluation parameter corresponding to the control loop, and determining the performance level of the control loop according to the performance evaluation parameter. Through obtaining a variety of data including the measurement value, setting value and operation value of the control loop and constructing the process model for updating the response time in the control loop, the performance of the control loop is evaluated based on the obtained data, at the same time, the iterative updating of an evaluation standard is carried out based on the process model and the combination of a variety of data, compared with the prior art, the possibility of control performance deterioration caused by delayed manual maintenance can be reduced, and the probability of security risks of the control loop is reduced.

Description

technical field [0001] The invention belongs to the field of automatic control, in particular to a PID performance evaluation method. Background technique [0002] According to statistics, more than 90% of automatic control loops adopt PID (proportion-proportion, integral-integral, differential-differential) control strategy. With the gradual improvement of the industrial automation level, the large-scale distributed control system with the distributed control system (Distributed Control System, DCS) as the core has become a must for industrial production. [0003] With the popularization of the distributed control system DCS, there are a large number of PID control loops in modern industry, and these loops promote the automatic operation of production. These circuits generally have good performance when they are put into operation, but if they are not regularly maintained, their performance will degrade over time. Poor control loop performance will reduce the effectivenes...

AI Technical Summary

Problems solved by technology

Poor control loop performance will reduce the effectiveness of the control loop, which can lead to problems such as lower product yield, off-spec product, and increased operating costs

However, there are usually a large number of control loops whose dynamic characteristics often change in large-scale process devices. Timely discovery of these loops with deteriorating performance requires a lot of human resources, and there are few corresponding maintenance engineers in the factory, which cannot achieve timely discovery and accurate maintenance. In an ideal maintenance state, the control performance can only be allowed to deteriorate step by step, which will bring safety hazards to the safe and stable operation of the device

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