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Process industry plantwide control loop oscillation source positioning method based on model identification method

A control loop, process industry technology, applied in the directions of comprehensive factory control, comprehensive factory control, program control, etc., can solve the problem of low accuracy, and achieve the effect of eliminating serious harm and improving accuracy

Active Publication Date: 2015-09-30
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Through simulation research, we found that the above methods all have a common problem, that is, for different simulation objects, their accuracy rates are not very high.

Method used

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  • Process industry plantwide control loop oscillation source positioning method based on model identification method
  • Process industry plantwide control loop oscillation source positioning method based on model identification method
  • Process industry plantwide control loop oscillation source positioning method based on model identification method

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Embodiment Construction

[0016] Specific embodiments of the present invention are described in conjunction with the accompanying drawings. The basic principles of this method for locating the oscillation source of the process industry plant-level control loop are as follows:

[0017] First, assume that in a multi-loop control system with N loops, multi-loop oscillation occurs. That is to say, there are M loops where loop signal oscillation occurs. Obviously, M≤N. An original loop variable data set A that only includes the above M loop signal oscillations is constructed. There are M elements in the data set A which are composed of sampled data sequences of length S. If using matrix A M×S To represent the data set A, then A M×S The dimension of the matrix is: M×S, namely A M×S =[a 1 ,a 2 ,...,a M ] T , where a i (i=1,2,...,M) represents the sampling data sequence of the i-th loop.

[0018] Secondly, for the data set A, combined with frequency-domain non-negative matrix factorization (NMF) or...

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Abstract

The invention discloses a process industry plantwide control loop oscillation source positioning method based on a model identification method. The positioning method includes the steps: aiming at a multiloop control system, establishing an original loop variable dataset comprising a plurality of loop signal oscillations; adopting a frequency domain non-negative matrix factorization or frequency domain independent component analysis method for processing the original loop variable dataset so as to extract one or more to-be-tested loop sets with identical frequency spectrum bases; according to controller output quantity and controlled variables of the loops, subjecting each loop in the to-be-tested loop sets to generalized controlled object model identification including pneumatic control valve viscoelastic model parameters so as to obtain minimum fitting errors corresponding to optimal generalized controlled object model identification results in correspondence to all loops in each to-be-tested loop set. The method has the advantages of high accuracy and effectiveness in positioning of plantwide control loop oscillation sources.

Description

technical field [0001] The invention belongs to the field of control or regulation systems, in particular to a process industry plant-level control loop oscillation source positioning method based on a model identification method. Background technique [0002] Due to the increasing complexity of the modern process industry and the lack of daily maintenance of the controller, industrial processes such as electric power, petroleum, chemical industry, steel, paper, cement, etc. generally have poor control loop performance. Foreign studies have shown that there are 1 The control loop of / 3 is in an oscillating state. Loop oscillation is an obvious manifestation of control performance degradation. There are many possible causes of control loop oscillation: non-linear faults in the control valve, such as friction, dead zone, recoil and sticking; control parameter adjustment Inappropriate, which makes the system tend to be unstable and cause oscillation; from external oscillation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02G05B19/41875
Inventor 曹鸣
Owner SOUTHEAST UNIV
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