NDLI: Multivariable Disturbance Observer Based Advanced Feedback Control Design and Its Application to a Grinding Circuit

Content Provider	IEEE Xplore Digital Library
Author	Ping Zhou Wei Dai Tian-You Chai
Copyright Year	1993
Abstract	Design of advanced feedback control (AFC) for optimal process operation has been mostly based on a hierarchical structure for many years. Since many advanced control algorithms (such as the model predictive control) do not handle disturbances directly in their design phase, it is difficult to achieve satisfactory performance in controlling complex process operations in the presence of heavy disturbances and large uncertainties. Focused on this practical challenge, in this paper we propose a novel multivariable disturbance observer (MDOB) to improve the disturbance rejection performance of conventional AFCs. The MDOB formulation is based on the approximate inversion of the multivariable generalized system, which consists of the multivariable operation process and the lower level basic feedback control system. All the stable and realizable MDOBs are characterized in terms of time delays and nonminimum phase zeros of the open-loop generalized systems. In the proposed MDOB-based AFC, the advanced feedback controller acts as a presetting controller to generate the proper pre-setpoint for the lower level basic feedback control (BFC) system such that a desired setpoint tracking is achieved. The MDOB acts as a compensator to enhance the operational performance of the process by dynamically adjusting the setpoints of the BFC according to the observed disturbances and plant uncertainties. Theoretical analysis, simulation comparisons, and experimental evaluation using a hardware-in-loop simulation platform of a grinding circuit are given, showing the effectiveness, validity, and advantages of the proposed approach.
Sponsorship	IEEE Control Systems Society
Starting Page	1474
Ending Page	1485
Page Count	12
File Size	4644421
File Format	PDF
ISSN	10636536
Volume Number	22
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency control Feedback control Process control Uncertainty Delay effects Observers MIMO multivariable disturbance observer (MDOB). Advanced feedback control (AFC) disturbance rejection grinding circuit (GC) model predictive control (MPC) multivariable disturbance observer (MDOB)
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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