Fast plant test for model-based control

A device and model technology, applied in the field of multi-variable system identification, can solve problems such as reducing equipment testing time

Inactive Publication Date: 2007-07-25
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Several technical issues are being challenged regarding reducing device testing time while extracting process control-relevant information in a device-friendly manner and without compromising (possibly improving) the quality of the obtained models

Method used

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  • Fast plant test for model-based control
  • Fast plant test for model-based control
  • Fast plant test for model-based control

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Embodiment Construction

[0039] The present invention relates to the design of a rapid test of a plant to obtain a system model for model-based control of a system, such as an air separation unit (ASU), a hydrogen carbon monoxide (HyCO) plant or a natural gas liquefaction plant (NGL), which With multiple input (manipulable) channels and multiple output (controllable) channels. An example system is shown as device 320 in FIG. 3 . Of course, other equipment such as petrochemical equipment, or other hybrid systems including electrical and mechanical systems, need to be operated and tested by a model controller according to the present invention.

[0040] An important consideration in such a test is the occurrence of the disturbance signal used to test the system's response to disturbances in its input level. The book Dither Signals in System Identification (by K. Godfrey, Prentice Hall International Ltd., 1994) provides a comprehensive background in relation to the design of dither signals for model dev...

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Abstract

A method and apparatus are provided for designing perturbation signals to excite a number of input variables of a system, in order to test that system for the purpose of obtaining models for the synthesis of a model-based controller. The method begins with providing input parameters of the system. A plurality of binary multi-frequency (BMF) signals are generated based on these input parameters and the frequency spectra of these BMF signals are calculated. One BMF signal is selected out of the set of BMF signals so that the frequency spectrum of the selected BMF signal most closely matches a desired frequency spectrum specified by the input parameters. The selected BMF signal is used as a first perturbation signal for testing the system. The selected BMF signal is also shifted by predetermined amounts of samples to create delayed copies of the original BMF signal to be used as additional perturbation signals.

Description

[0001] This application is a divisional application of the application dated August 22, 2003, the application number is 03155131.9, and the invention title is "quick test of equipment based on model control". technical field [0002] The present invention relates to a method and apparatus for open-loop testing and system identification, with which a system model can be generated for model-based control in the system. More specifically, the present invention relates to a multivariate system identification method, which uses a plant-friendly (plant-friendly) binary multi-frequency (BMF) signal, combined with multivariate parametric modeling techniques, can realize the test Significant reduction in time. Background technique [0003] One method used to characterize the dynamics of a system is to apply perturbation signals to the input channels and then measure the system's response to these signals. These input and output signals are then processed to give an estimate of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02G06Q50/00G01M99/00G01R31/28G05B13/02G05B13/04G05B23/00G06F19/00H03K3/00H03K3/84
CPCG05B17/02
Inventor S·L·科撒雷J·A·曼德勒
Owner AIR PROD & CHEM INC
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