Method for detecting intermittent oscillation of industrial control circuits in online manner

A technology of industrial control and detection method, which is applied in the direction of electrical testing/monitoring, etc., and can solve problems such as the sub-signal components are easily mixed with each other, the oscillation detection is unfavorable, and the regularity of the oscillation component cannot be quantitatively calculated, etc.
CN104950873AActive Publication Date: 2015-09-30ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2015-09-30

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Abstract

The invention discloses a method for detecting intermittent oscillation of industrial control circuits in an online manner. The method includes steps of (1), preliminarily acquiring a big window historical datum from each to-be-detected control circuit, processing the big window historical data and initializing detection systems; (2), acquiring a small window process datum from each to-be-detected control circuit in real time in an online manner, and updating the big window data by the aid of the small window process data; (3), combining the small window data with the original big window data, processing the small window data and the big window data and recombining the small window data with the big window data to obtain various frequency recombined sub-signals of the updated big window data; (4), computing monitoring statistics corresponding to the various recombined sub-signals and judging real-time detection results; (5), repeatedly carrying out steps (2), (3) and (4) and integrating all judgment results to obtain online detection results. The method has the advantages that intermittent and multi-period oscillation behavior of the industrial control circuits can be quantitatively detected by the aid of the method, compositions such as multiple-oscillation, intermittent oscillation and non-stationary signals in the intermittent and multi-period oscillation behavior can be differentiated from one another, and regular degrees and periods of various oscillation components can be acquired.
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Description

technical field

[0001] The invention relates to the field of performance evaluation in an industrial control system, in particular to an on-line detection method for intermittent oscillation of an industrial control loop. Background technique

[0002] Modern industrial process equipment has the characteristics of large scale, high comprehensiveness, complex control, many variables, and long-term operation under closed-loop control. The common chemical production process in the industry often contains thousands of control loops, and these loops affect each other due to the coupling relationship. Due to the ubiquitous characteristics of controller over-tuning, external disturbance and non-linear operation of control valves in industrial control loops, oscillation behavior of control loops often occurs, which greatly affects the economic benefits and stability of industrial process equipment.

[0003] Preliminary and accurate oscillation detection of industrial process equipme...

Claims

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