Multivariate economic performance assessment of an MPC controlled electric arc furnace

Wei, Donghui; Craig, I.K.; Bauer, Margret

doi:10.1016/j.isatra.2007.01.005

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…(1) The economic impact of the controlled variables is independent of each other (see Wei et al (2007) for instances where this is not the case). (2) When the grind fineness varies, the mineral recoveries will differ.…”

Section: Assumptions Used For Pf Developmentmentioning

confidence: 99%

“…The preferred way to indicate economic performance is by integrating the product of a PF and PDF of a time series of a process variable over a period of interest (Zhou, 2002;Wei et al, 2007;Oosthuizen et al, 2004), as described in Section 3.4. Both the LOAD and SLEV are controlled well and do not deviate from the constraints and thus the relevant economic impact is null.…”

Section: Economic Performance Of the Base Casementioning

confidence: 99%

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Economic performance assessment of two ROM ore milling circuit controllers

Wei¹,

Craig²

2009

Minerals Engineering

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a b s t r a c tEconomic performance assessment of control systems is receiving increasing attention in both academia and industry. A relevant framework is proposed in Bauer and Craig (Bauer, M., Craig, I.K., 2008. Economic assessment of advanced process control -a survey and framework. Journal of Process Control 18 (1), 2-18) based on a comprehensive survey of the methods for economic analysis of advanced process control systems. The framework provides a formal procedure for the economic assessment of control systems. A practically motivated simulation study is used to cast the economic performance assessment of a nonlinear model predictive controller and three single-loop PID controllers for a run-of-mine milling circuit into this framework. Performance functions of the milling circuit, which dynamically relate the circuit process variables to monetary values, are developed based on a survey study on milling circuits and an in-depth literature study.

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Section: Assumptions Used For Pf Developmentmentioning

confidence: 99%

Section: Economic Performance Of the Base Casementioning

confidence: 99%

Economic performance assessment of two ROM ore milling circuit controllers

Wei¹,

Craig²

2009

Minerals Engineering

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“…the interaction of the economic impact of CVs is considered, JPFs are developed. That is the case in Wei et al (2007) and Zhou and Forbes (2003). A decision needs to be made at the beginning of EPA whether to develop JPFs or IPFs, which has a significant influence on some decisions that need to be made later, e.g.…”

Section: Develop Performance Functions (υ(Y))mentioning

confidence: 99%

“…However, when the multivariate nature is contemplated, the EPI of dependent variables will be derived by integrating the JPF and JPDF (Wei et al, 2007). The multivariate derivation method will lead to more accurate results (Zhou, 2002;Zhou and Forbes, 2003).…”

Section: Multivariate Derivationmentioning

confidence: 99%

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Development of performance functions for economic performance assessment of process control systems

Wei

Craig

2009

Africon 2009

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Degree: PhD (Electronic Engineering) SummaryEconomic performance assessment (EPA) of control systems is receiving increasing attention in both academia and industry. It addresses the estimation of the potential benefits resulting from control upgrade projects and monitoring and improvement of economic performance of the control system. Economic performance of control systems can often be related to crucial controlled variables dynamically and when controlled variables move away from an optimal operating point either more profit will be made or more cost will be incurred. This relation can be modelled by performance functions (PFs). When the multivariate nature of a process's economic model is not considered, PFs of different controlled variables are referred to as individual performance functions. Otherwise, PFs of dependent controlled variables are referred to as joint performance functions.PFs play an important role in the latest techniques of EPA. There appears, however, to be no systematic method for developing PFs. The lack of such a method restrains further research into EPA, as without well-established PFs an EPA cannot be conducted smoothly and therefore cannot effectively support decision-making for management. The development of PFs is a bottleneck in the further research into EPA. Furthermore, the multivariate nature of processes has not been taken into account sufficiently as far as the relevant literature is concerned, which hampers the accuracy of PFs and accordingly the accuracy of economic assessment results.The contributions of this thesis lie in the following aspects:• A methodology for developing PFs is proposed, based on the PF development for an electric arc furnace, a grinding mill circuit and a stage of a bleach plant.• A comprehensive case study of an EPA of three controllers of a grinding mill circuit is conducted using a newly published framework to show the significance of PFs and how to perform an EPA systematically.• The current practice and guidelines on the control and functional/economic performance i assessment of grinding mill circuits are captured using a survey study.The multivariate nature of an electric arc furnace's economic model is investigated and joint performance functions are built based on individual performance functions. A multivariate economic assessment is conducted that shows how joint performance functions can help to provide a more accurate estimate of the economic performance of a controlled process.A web-based survey study on grinding mill circuits in mineral processing industries is conducted. One of its objectives is to obtain general PFs of grinding circuits. The survey results provide instructive insight into the PFs of grinding circuits. Furthermore, an in-depth literature review is conducted and the relationship between the product's particle size distribution of grinding mill circuits and mineral recovery in downstream flotation circuits is revealed. The PFs of a grinding mill circuit being considered are formed, based on the survey results and litera...

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An improved LQG benchmark for MPC economic performance assessment and optimisation in process industry

Liu

Xie

2012

Can J Chem Eng

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Performance assessment and optimisation for MPC have attracted much research interest. As a typical performance assessment benchmark, the LQG benchmark is regressed from asymmetrical points, leading to unnecessary computation and unsatisfactory regression results. To tackle this problem, an equigrid LQG benchmark was proposed for the two‐layer MPC assessment and optimisation, and the optimal setpoint for MPC was calculated to replace the experiential one. Then the LQG benchmark for sensitivity analysis was introduced. Economic performance assessment of the control system in a delayed coking furnace shows the effectiveness of the proposed approach. © 2012 Canadian Society for Chemical Engineering

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Multivariate economic performance assessment of an MPC controlled electric arc furnace

Cited by 25 publications

References 9 publications

Economic performance assessment of two ROM ore milling circuit controllers

Economic performance assessment of two ROM ore milling circuit controllers

Development of performance functions for economic performance assessment of process control systems

An improved LQG benchmark for MPC economic performance assessment and optimisation in process industry

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