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Multi-loop oscillation extracting and detecting method of industrial process

An industrial process and detection method technology, applied in program control, electrical testing/monitoring, testing/monitoring control systems, etc., can solve problems such as the inability to achieve automatic and non-intervention detection, achieve rich data support, improve detection accuracy and Reliability, high reliability effect

Active Publication Date: 2017-05-10
ZHEJIANG UNIV
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Problems solved by technology

However, these methods cannot realize fully automatic non-intervention detection for industrial processes with non-stationary and nonlinear characteristics, and need to design targeted filters in advance for data stabilization processing and oscillation component separation

Method used

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  • Multi-loop oscillation extracting and detecting method of industrial process
  • Multi-loop oscillation extracting and detecting method of industrial process
  • Multi-loop oscillation extracting and detecting method of industrial process

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Embodiment Construction

[0050] Taking the performance evaluation of a fluidized batch process device in a domestic factory as an example, the following is a detailed description of the multi-loop oscillation (plant-level oscillation) behavior detection method of a chemical process with a viscous control valve.

[0051] like figure 1 As shown, during the production process, the fluidized bed T4 needs to be supplied with inert gas to ensure its safety. This gas fills the equipment before filling, keeps stable during the production process, acts as a purge gas after the collection stage, and passes through the fan function, continuously circulates in the device. The inert gas is heated by the heat exchanger W1, and enters the storage tank B3 under the action of the fan V2. After the storage tank controls the pressure, the inert gas enters the fluidized bed T4, and the fluid medium is sprayed into the fluidized bed T4 from the top atomizing nozzle. Perform the fluidization process. This gas source flow...

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Abstract

The invention discloses a multi-loop oscillation extracting and detecting method of industrial process. The method comprises the following steps that in control loops to be detected, process output signals of all the control loops to be detected are collected in advance; a spectrum related waveform matching method is used to continue end points of the output signals of the loops; improved multi-dimensional empirical mode decomposition is carried out on process output data after end-point continuation; a regularity index of a zero crossing point of each decomposed sub-signal is calculated; whether each regularity index exceeds a set threshold is determined, and whether an oscillation behavior exists in two or more decomposed sub-signals of the same layer is determined; and a detection result is obtained according to all determination results. The method of the invention can be used to detect the oscillation behavior of multiple loops in the industrial process quantitatively, regularity degrees and periods of oscillation components are obtained simultaneously, and abundant data support is provided for oscillation behavior evaluation and fault source diagnosis.

Description

technical field [0001] The invention relates to the field of performance evaluation in industrial control, in particular to an industrial process multi-loop oscillation extraction and detection method based on improved multi-dimensional empirical mode decomposition. Background technique [0002] Modern industrial process equipment has the characteristics of large scale, high comprehensiveness, complex operation, many variables, and long-term operation under closed-loop control. Common industrial chemical production processes often contain thousands of control loops, and these control loops affect each other due to coupling relationships. Due to the ubiquity of controller over-tuning, external disturbance and non-linear operation of control valves in industrial control loops, the oscillation behavior of control loops, especially multi-loop oscillations, often occurs, which greatly affects the economic benefits and benefits of industrial process equipment operation. stability...

Claims

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065
Inventor 谢磊郎恂钟丹苏宏业
Owner ZHEJIANG UNIV
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