Method and device for generating an excitation signal for a chemical process

Abstract

The present invention provides a method and device for generation of excitation signals for chemical process, belonging to the automation control field. The method comprises: obtaining the type of a control loop, determining a step signal parameter, and combining the step signal parameter to generate initial excitation signals; inputting the initial excitation signals into the control loop, and collecting process data in the operation process of the control loop; and extracting amplitude information in the process data, determining an area specific value, comparing the area specific value with a preset threshold value, performing regulation of the initial excitation signals according to a comparison result, and determining the regulated excitation signals. The method and device for generation of excitation signals for the chemical process can perform real-time regulation of excitation signals according to the output result in the whole regulation process to realize tracking regulation through combination of the output result and only use the type of the loop and the safe range to design reasonable step excitation signals and obtain a good excitation effect so as to reduce the repeated test and the test time to the utmost extent and simplify the algorithm.

Description

technical field [0001] The invention belongs to the field of automatic control, in particular to a method and a device for generating excitation signals used in chemical processes. Background technique [0002] At present, the control algorithms of industrial processes are mainly PID control and predictive control. The implementation and maintenance of both PID controller and predictive controller are inseparable from model identification, and model identification is inseparable from the input and output data of the process. In order to obtain input and output data that reflect the true characteristics of the process, the process must be stimulated. The quality of the excitation signal design directly affects the accuracy of the final model identification. [0003] Commonly used excitation signals that satisfy this property include filtered white noise signals, superimposed sine (cosine) wave signals, binary pseudo-random signals (PRBS), step signals, etc. The existing ex...

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Problems solved by technology

Existing excitation signal design technologies are mainly divided into two categories, one is the initial design of the binary excitation signal (PRBS or step signal) according to the loop characteristics, but the lack of design tracking and evaluation cannot guarantee the final application effect

The second type is to optimize the design by constructing optimization propositions based on the initial model. This method is very complicated to calculate and needs to be solved with the help of an optimization toolbox, and can only stay in the excitation signal design of superimposed sine (cosine) waves.

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