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Benoît Chachuat

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Related publications (43)

Page 2 of 3

Selective Input Adaptation in Parametric Optimal Control Problems with Path Constraints

Dominique Bonvin, Benoît Chachuat, Saurabh Anand Deshpande

This paper is concerned with input adaptation in dynamic processes in order to guarantee feasible and optimal operation despite the presence of uncertainty. For optimal control problems having mixed control-state constraints, two sets of directions can be ...

2010

Dynamic optimisation of small size wastewater treatment plants including nitrification and denitrification processes

Benoît Chachuat

In this paper, dynamic optimisation of small size wastewater treatment plants is studied. The problem is stated as a hybrid dynamic optimisation problem which is solved using a gradient-based method. The aeration policy which minimises the energy consumpti ...

2001

A Dual Modifier-Adaptation Approach for Real-Time Optimization

Dominique Bonvin, Benoît Chachuat, Alejandro Gabriel Marchetti

For good performance in practice, real-time optimization schemes need to be able to deal with the inevitable plant-model mismatch problem. Unlike the two-step schemes combining parameter estimation and optimization, the modifier-adaptation approach does no ...

Elsevier2010

Design and Practical Use of Probabilistic Observers for Mass-Balance-Based Bioprocess Models

Benoît Chachuat, Olivier Bernard

In this paper, the design of probabilistic observers for mass-balance based bio- process models is investigated. It is assumed that the probability density function of every uncertain parameter, input and/or initial state is known a priori. Then, the proba ...

2004

Model Parameterization Tailored to Real-Time Optimization

Dominique Bonvin, Benoît Chachuat

Challenges in real-time process optimization mainly arise from the inability to build and adapt accurate models for complex physico-chemical processes. This paper surveys different ways of using measurements to compensate for model uncertainty in the conte ...

2008

Adaptation Strategies for Real-time Optimization

Dominique Bonvin, Benoît Chachuat

2009

Real-Time Optimization via Adaptation and Control of the Constraints

Dominique Bonvin, Benoît Chachuat, Alejandro Gabriel Marchetti

In the framework of real-time optimization, measurements are used to compensate for effects of uncertainty. The main approach uses measurements to update the parameters of a process model. In contrast, the constraint-adaptation scheme uses the measurements ...

2008

Neighboring-Extremal Control for Singular Dynamic Optimization Problems. II- Multiple-Input Systems

Dominique Bonvin, Benoît Chachuat, Sébastien Gros

Dynamic optimization provides a unified framework for improving process operations while taking operational constraints into account. In the presence of uncertainty, measurements can be incorporated into the optimization framework for tracking the optimum. ...

2009

Design of Probabilistic Observers for Mass-Balance-Based Bioprocess Models

Benoît Chachuat, Olivier Bernard

In this paper, the design of probabilistic observers for mass-balance based bioprocess models is investigated. It is assumed that the probability density of every uncertain parameter, input and/or initial state is known a priori. Then, the probability dens ...

2004

Parametric Sensitivity of Path-Constrained Optimal Control: Towards Selective Input Adaptation

Dominique Bonvin, Benoît Chachuat, Saurabh Anand Deshpande

In the context of dynamic optimization, plant variations necessitate adaptation of the input profiles in order to guarantee both feasible and optimal operation. For those problems having path constraints, two sets of directions can be distinguished in the ...

2009

An integrated system to remote monitor and control anaerobic wastewater treatment plants through the internet

Benoît Chachuat, Olivier Bernard, Andrea Franco

The TELEMAC project brings new methodologies from the Information and Science Technologies field to the world of water treatment. TELEMAC offers an advanced remote management system which adapts to most of the anaerobic wastewater treatment plants that do ...

2005

Assessing Model Complexity from Anaerobic Digestion Data: When is Model AM1 Required?

Benoît Chachuat, Olivier Bernard

The anaerobic digestion ecosystem is complex, involving a broad variety of substrates and up to 140 bacterial species. This paper applies a methodology that determines the least number of macroscopic bioreactions to be taken into account in order to explai ...

2005

Process Optimization via Constraints Adaptation

Dominique Bonvin, Benoît Chachuat, Alejandro Gabriel Marchetti

In the framework of real-time optimization, measurement-based schemes have been developed to deal with plant-model mismatch and process variations. These schemes differ in how the feedback information from the plant is used to adapt the inputs. A recent id ...

2008

Real-time optimization of continuous processes via constraints adaptation

Dominique Bonvin, Benoît Chachuat, Alejandro Gabriel Marchetti

In the framework of process optimization, measurements can be used to compensate for the effect of uncertainty. The method studied in this paper combines a process model and measurements to iteratively improve the operation of continuous processes. Unlike ...

2007

Global Solution of Dynamic Optimization and Mixed-Integer Dynamic Optimization

Benoît Chachuat

An overview of global methods for dynamic optimization and mixed-integer dynamic optimization (MIDO) is presented, with emphasis placed on the control parametrization approach. These methods consist of extending existing continuous and mixed-integer global ...

2006

Towards Global Bilevel Dynamic Optimization

Benoît Chachuat

The global solution of bilevel dynamic optimization problems is discussed. An overview of a deterministic algorithm for bilevel programs with nonconvex functions participating is given, followed by a summary of deterministic algorithms for the global solut ...

2009

Selective Input Adaptation in Parametric Optimal Control Problems involving Terminal Constraints

Dominique Bonvin, Benoît Chachuat, Saurabh Anand Deshpande

This paper is concerned with input adaptation in dynamic processes in order to guarantee feasible and optimal operation despite the presence of uncertainty. For optimal control problems having terminal constraints, two sets of directions can be distinguish ...

2010

Batch process optimization via run-to-run constraints adaptation

Dominique Bonvin, Benoît Chachuat, Alejandro Gabriel Marchetti

In the batch process industry, the available models carry a large amount of uncertainty and can seldom be used to directly optimize real processes. Several measurement-based optimization methods have been proposed to deal with model mismatch and process di ...

2007

A Two-Step Procedure for Estimating the Parameters in Mass-Balance-Based Bioprocess Models

Benoît Chachuat, Olivier Bernard

In this paper, we consider a two-step procedure for estimating the parameters in mass-balance based bioprocess models. In the first step, the values or combinations of the yield coefficients are calculated from mass-balance considerations without formulati ...

2004

Dynamic optimisation of small size wastewater treatment plants including nitrification and denitrification processes

Benoît Chachuat

Elsevier2000