Frequency domain design method for decentralized control of multivariable processes

doi:10.16511/j.cnki.qhdxxb.2016.24.017

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Abstract The input-output variable pairing and the control-loop configuration are the first steps in designing a decentralized control configuration for multivariable processes. The relative gain array (RGA) method and improved variations have been widely used for control system designs, but they generally utilize time domain process information that create challenges when dealing with long lag times, integrators, and unstable systems. This work describes a relative frequency gain method as the ratio of the open-loop frequency gain to the close-loop frequency gain. An interaction measurement index is given through averaging the differences between the relative frequency gain and (1, j0) in the full frequency domain. The interaction measurement index array is used to create a new control-loop pairing criterion for the control structure selection. This method makes better use of the dynamic process characteristics than existing methods through frequency domain analysis. The method is simple and effective, with long lag times, integrators, and unstable systems.

Keywords multivariable systems decentralized control control configuration design interaction analysis frequency domain

ZTFLH:

TQ021.8

Issue Date: 15 April 2016

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	XU Feng
	PAN Qi
	WANG Yilan
	LUO Xionglin

Cite this article:

XU Feng,PAN Qi,WANG Yilan, et al. Frequency domain design method for decentralized control of multivariable processes[J]. Journal of Tsinghua University(Science and Technology), 2016, 56(4): 448-452.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2016.24.017 OR http://jst.tsinghuajournals.com/EN/Y2016/V56/I4/448

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