A method for detecting oscillations in the feedback control loop of a process industry process control system

Abstract

The present invention relates to the technical field of process industry, and in particular to a method for detecting oscillation in a feedback control loop of a process industry process control system, including: obtaining the data time series of the set value, measured value, and valve position value of the control loop, and performing data preprocessing on the data time series of the set value, measured value, and valve position value of the control loop to obtain first data; determining the time-domain fluctuation characteristics and frequency characteristic features of the preprocessed measured value data time series according to the first data; inputting the time-domain fluctuation characteristics and frequency characteristic features into a pre-set oscillation degree acquisition algorithm to obtain the oscillation degree result of the control loop; the oscillation degree acquisition algorithm is set based on fuzzy adaptive rules. The present invention solves the problems of low efficiency in traditional control loop oscillation positioning and analysis, high usage thresholds, and many restrictions, and provides technical method support for the efficient operation and maintenance of the control loop of production devices and reduces the labor intensity of operators.

Images