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Control method of denitrification process in sewage treatment based on fuzzy sliding mode without chattering

A technology for sewage treatment and process control, applied in water/sludge/sewage treatment, adaptive control, general control system, etc., can solve the problems of high gain, high frequency buffeting control, limited adaptability, and insufficient control accuracy. , to achieve the effect of improving anti-interference ability, preventing parameter characteristic drift, and taking into account stability and dynamic response ability

Active Publication Date: 2022-03-15
BEIJING UNIV OF TECH
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Problems solved by technology

With the research progress of intelligent control methods at home and abroad in recent years, the adaptability of the control method has been improved, but for the sewage treatment process with strong nonlinearity and significant changes in working conditions, there are still problems of poor stability, limited adaptability, and insufficient control accuracy. ; The high-gain and high-frequency chattering problems of traditional robust control also restrict its practical application

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  • Control method of denitrification process in sewage treatment based on fuzzy sliding mode without chattering
  • Control method of denitrification process in sewage treatment based on fuzzy sliding mode without chattering
  • Control method of denitrification process in sewage treatment based on fuzzy sliding mode without chattering

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Embodiment Construction

[0039] The present invention is aimed at typical sewage treatment A / O biological denitrification process (such as figure 1 shown), a control scheme based on fuzzy sliding mode without chattering is proposed (such as figure 2 shown) and the implementation steps are as follows:

[0040] Step 1: Determine the control object

[0041] The control method of the present invention is aimed at the nitrate nitrogen S in the biological denitrification process of sewage treatment no and dissolved oxygen concentration S o For control, the control unit utilizes online sensor signals based on S no The error with the target value to achieve the internal return flow Q intr regulation; based on S o The error with the target value, to achieve aerobic final aeration K La5 The adjustment; the error of the controlled object is stipulated as:

[0042]

[0043] where e 1 (t) is the error between the nitrate nitrogen concentration and the target value at time t, y 1 (t) is the concentrati...

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Abstract

The invention relates to a control method based on fuzzy sliding mode without chattering, which belongs to the field of automatic control and information technology, and also belongs to the technical field of sewage treatment. In view of the characteristics of highly nonlinear, multivariable coupling, and serious interference in the denitrification process of sewage treatment, the present invention realizes the precise control of the concentration of nitrate nitrogen and dissolved oxygen in the process; the method can automatically control the internal return flow and aeration Adaptive regulation ensures long-term stable operation of the process under changing working conditions; overcomes strong interference while maintaining control accuracy, suppresses control signal chattering; and does not need to establish an accurate mathematical model, providing a new control scheme for industrial systems with unknown models .

Description

technical field [0001] Based on the non-chattering sliding mode and self-adaptive fuzzy control technology, the invention proposes a precise control method for the concentration of nitrate nitrogen and dissolved oxygen in the denitrification process of sewage treatment. It is a model-free nonlinear multivariable control method, and it is also a combination of robust control and intelligent control methods. The invention belongs to the field of automatic control and information technology, and also belongs to the technical field of sewage treatment. Background technique [0002] Eutrophication is one of the main problems of water pollution. my country has put forward stricter requirements for total nitrogen in the effluent of sewage treatment. Nitrogen-containing pollutants in sewage cannot be removed by adding chemicals, so the denitrification process is the difficulty and focus of advanced sewage treatment. [0003] Biological treatment is often used in the existing urban...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04C02F7/00
CPCG05B13/042C02F7/00Y02W10/10
Inventor 韩红桂王童伍小龙
Owner BEIJING UNIV OF TECH
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