Control loop performance evaluation method and system based on permutation entropy

A technology of control loop and permutation entropy, which is applied in the field of control loop performance evaluation based on permutation entropy, to achieve the effect of improving accuracy, improving operation management efficiency, and realizing real-time evaluation and monitoring functions

Inactive Publication Date: 2018-05-04
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

Faced with so many control loops and valve equipment, it is a huge challenge for...

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  • Control loop performance evaluation method and system based on permutation entropy
  • Control loop performance evaluation method and system based on permutation entropy
  • Control loop performance evaluation method and system based on permutation entropy

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[0039] In order to better illustrate the technical solution provided by the present invention, further description will be made here in conjunction with the accompanying drawings.

[0040] like figure 1 As shown, a control loop performance evaluation method based on permutation entropy provided by the present invention, the method performs normalization processing on permutation entropy values, and judges the performance of the control loop according to the normalized results, specifically including the following steps:

[0041] Step 1: Data collection, collect the pressure data of each outlet of the control loop to form a set A, A={X(i),i=1,2,3······n}; where, X(i) Indicates the pressure value at each outlet of the control loop (referring to the size of the pressure per unit area (1cm2), the unit is Pa (Pa)), i indicates the pressure value of an outlet collected for the i-th time; in this assumption set A The elements of are respectively 3Pa, 4Pa, 6Pa, 1Pa, 3Pa, 5Pa, 7Pa, 2P...

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Abstract

The invention discloses a control loop performance evaluation method and system based on permutation entropy. The method includes the steps that outlet pressure data of a natural gas pipeline controlloop is collected; the appropriate embedded dimension and delay time are selected, and the outlet pressure data sequence is reconstructed to obtain a reconstruction matrix; reconstruction components in the reconstruction matrix are sequenced according to the numerical value, and each reconstruction component obtains one symbol sequence; the occurrence probability of each symbol sequence is calculated and substituted into a permutation entropy formula to calculate the permutation entropy of the outlet pressure data; normalization processing is conducted on the permutation entropy to obtain thecontrol loop performance evaluated based on the permutation entropy algorithm. By adopting the method and the system, when the pressure control loop performance has a downtrend or an electric adjusting valve breaks down, the device is capable of automatically reminding a manager in time, in this way, labor intensity of staff is reduced greatly, operation management efficiency is improved, and excessive pressure fluctuation and safety production accidents in a natural gas distributing state are avoided or reduced.

Description

technical field [0001] The present invention relates to the technical field of natural gas pipeline transportation, in particular to the technical field of natural gas pipeline control loop performance evaluation, and specifically refers to a control loop performance evaluation method and system based on permutation entropy for natural gas distribution stations. Background technique [0002] As a high-quality, efficient and clean energy, natural gas has developed into one of the world's three major energy sources. Natural gas is transported by pipeline to provide downstream users with stable pressure, safe and reliable natural gas. Natural gas from long-distance pipelines enters the urban pipeline network through high- and high-pressure, medium- and high-pressure stations. The natural gas distribution station is a station set up along the gas pipeline to distribute gas to users. In order to ensure that high-pressure natural gas enters the downstream pipeline safely and main...

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Application Information

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IPC IPC(8): G05D16/20G06F17/16
CPCG05D16/20G06F17/16
Inventor 陈亮吴平潘海鹏周伟
Owner ZHEJIANG SCI-TECH UNIV
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